Discussion:
[CF-metadata] Proposal for standard names: liquid and ice cloud fractions
Bodas-Salcedo, Alejandro
2015-02-20 16:59:32 UTC
Permalink
Dear All,

I would like to propose new standard names for liquid and ice cloud fractions (as far as I can see, they don't exist).
I am not sure if they follow the spirit of the CF conventions because cloud phase is not a well defined concept. I would appreciate your comments on this.

Regards,

Alejandro

** liquid_cloud_area_fraction

"X_area_fraction" means the fraction of horizontal area occupied by X. "X_area" means the horizontal area occupied by X within the grid cell. Cloud area fraction is also called "cloud amount" and "cloud cover". The cloud area fraction is for the whole atmosphere column, as seen from the surface or the top of the atmosphere. The cloud area fraction in a layer of the atmosphere has the standard name cloud_area_fraction_in_atmosphere_layer.

Units: 1

** ice_cloud_area_fraction

"X_area_fraction" means the fraction of horizontal area occupied by X. "X_area" means the horizontal area occupied by X within the grid cell. Cloud area fraction is also called "cloud amount" and "cloud cover". The cloud area fraction is for the whole atmosphere column, as seen from the surface or the top of the atmosphere. The cloud area fraction in a layer of the atmosphere has the standard name cloud_area_fraction_in_atmosphere_layer.

Units: 1

** liquid_cloud_area_fraction_in_atmosphere_layer

"Layer" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. "X_area_fraction" means the fraction of horizontal area occupied by X. "X_area" means the horizontal area occupied by X within the grid cell. Cloud area fraction is also called "cloud amount" and "cloud cover".

Units: 1

** ice_cloud_area_fraction_in_atmosphere_layer

"Layer" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. "X_area_fraction" means the fraction of horizontal area occupied by X. "X_area" means the horizontal area occupied by X within the grid cell. Cloud area fraction is also called "cloud amount" and "cloud cover".

Units: 1
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Dr Alejandro Bodas-Salcedo Earth Observation Research Scientist
Met Office Hadley Centre
FitzRoy Rd Exeter EX1 3PB United Kingdom
E-mail: ***@metoffice.gov.uk http://www.metoffice.gov.uk


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Martin Raspaud
2015-02-21 21:24:16 UTC
Permalink
Alejandro,

Not sure it's related, but there was a thread on cloud physical
properties a few year ago:
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/048566.html

Best regards,
Martin
Post by Bodas-Salcedo, Alejandro
Dear All,
I would like to propose new standard names for liquid and ice cloud
fractions (as far as I can see, they don't exist). I am not sure if
they follow the spirit of the CF conventions because cloud phase is
not a well defined concept. I would appreciate your comments on
this.
Regards,
Alejandro
** liquid_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** ice_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** liquid_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
** ice_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
Bodas-Salcedo, Alejandro
2015-02-23 11:25:21 UTC
Permalink
Dear Martin,

Thanks for pointing me to that thread, it was very useful. The standard names I am proposing are similar in concept to the existing 'thickness_of_liquid_water_cloud', so I guess the proposed names make sense.
I can think of two possible options:

The one that I originally proposed:

- liquid_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer

Or

- liquid_water_cloud_area_fraction
- ice_water _cloud_area_fraction
- liquid_water _cloud_area_fraction_in_atmosphere_layer
- ice_water_cloud_area_fraction_in_atmosphere_layer

The second set of names seems to be more consistent with existing names.

Regards,

Alejandro
-----Original Message-----
Martin Raspaud
Sent: 21 February 2015 21:24
Subject: Re: [CF-metadata] Proposal for standard names: liquid and ice cloud
fractions
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Alejandro,
Not sure it's related, but there was a thread on cloud physical
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/048566.html
Best regards,
Martin
Post by Bodas-Salcedo, Alejandro
Dear All,
I would like to propose new standard names for liquid and ice cloud
fractions (as far as I can see, they don't exist). I am not sure if
they follow the spirit of the CF conventions because cloud phase is
not a well defined concept. I would appreciate your comments on
this.
Regards,
Alejandro
** liquid_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** ice_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** liquid_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
** ice_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
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Jonathan Gregory
2015-02-24 06:46:36 UTC
Permalink
Dear Alejandro

I think that liquid_water_cloud would be preferable to liquid_cloud, on
grounds of consistency as you say, and also clarity. liquid_water is a phrase
used in many standard names to refer to cloud composition e.g.
atmosphere_mass_content_of_convective_cloud_liquid_water
to give just one example. What would ice_water_cloud mean? The phrase
ice_cloud is used in the existing standard_name
number_concentration_of_ice_crystals_in_air_at_ice_cloud_top
so I think ice_cloud would be OK to use if that's what you mean.

Best wishes

Jonathan
Date: Mon, 23 Feb 2015 11:25:21 +0000
Subject: Re: [CF-metadata] Proposal for standard names: liquid and ice cloud
fractions
Dear Martin,
Thanks for pointing me to that thread, it was very useful. The standard names I am proposing are similar in concept to the existing 'thickness_of_liquid_water_cloud', so I guess the proposed names make sense.
- liquid_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Or
- liquid_water_cloud_area_fraction
- ice_water _cloud_area_fraction
- liquid_water _cloud_area_fraction_in_atmosphere_layer
- ice_water_cloud_area_fraction_in_atmosphere_layer
The second set of names seems to be more consistent with existing names.
Regards,
Alejandro
-----Original Message-----
Martin Raspaud
Sent: 21 February 2015 21:24
Subject: Re: [CF-metadata] Proposal for standard names: liquid and ice cloud
fractions
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Alejandro,
Not sure it's related, but there was a thread on cloud physical
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/048566.html
Best regards,
Martin
Post by Bodas-Salcedo, Alejandro
Dear All,
I would like to propose new standard names for liquid and ice cloud
fractions (as far as I can see, they don't exist). I am not sure if
they follow the spirit of the CF conventions because cloud phase is
not a well defined concept. I would appreciate your comments on
this.
Regards,
Alejandro
** liquid_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** ice_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** liquid_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
** ice_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
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_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
----- End forwarded message -----
Bodas-Salcedo, Alejandro
2015-02-24 10:14:21 UTC
Permalink
Dear Jonathan,

Thanks for your comment. When I proposed ice_water_cloud I was trying to keep the same format for both phases, but I ice_cloud seems fine to me (I've seen 'ice' used for other compounds, but perhaps it's not correct).
With this change, the names would be:

- liquid_water_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_water_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer

Regards,

Alejandro
-----Original Message-----
Jonathan Gregory
Sent: 24 February 2015 06:47
Subject: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and ice cloud
fractions
Dear Alejandro
I think that liquid_water_cloud would be preferable to liquid_cloud, on
grounds of consistency as you say, and also clarity. liquid_water is a phrase
used in many standard names to refer to cloud composition e.g.
atmosphere_mass_content_of_convective_cloud_liquid_water
to give just one example. What would ice_water_cloud mean? The phrase
ice_cloud is used in the existing standard_name
number_concentration_of_ice_crystals_in_air_at_ice_cloud_top
so I think ice_cloud would be OK to use if that's what you mean.
Best wishes
Jonathan
----- Forwarded message from "Bodas-Salcedo, Alejandro"
Date: Mon, 23 Feb 2015 11:25:21 +0000
Subject: Re: [CF-metadata] Proposal for standard names: liquid and ice cloud
fractions
Dear Martin,
Thanks for pointing me to that thread, it was very useful. The standard names I
am proposing are similar in concept to the existing
'thickness_of_liquid_water_cloud', so I guess the proposed names make sense.
- liquid_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Or
- liquid_water_cloud_area_fraction
- ice_water _cloud_area_fraction
- liquid_water _cloud_area_fraction_in_atmosphere_layer
- ice_water_cloud_area_fraction_in_atmosphere_layer
The second set of names seems to be more consistent with existing names.
Regards,
Alejandro
-----Original Message-----
Martin Raspaud
Sent: 21 February 2015 21:24
Subject: Re: [CF-metadata] Proposal for standard names: liquid and ice cloud
fractions
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Alejandro,
Not sure it's related, but there was a thread on cloud physical
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/048566.html
Best regards,
Martin
Post by Bodas-Salcedo, Alejandro
Dear All,
I would like to propose new standard names for liquid and ice cloud
fractions (as far as I can see, they don't exist). I am not sure if
they follow the spirit of the CF conventions because cloud phase is
not a well defined concept. I would appreciate your comments on
this.
Regards,
Alejandro
** liquid_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** ice_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** liquid_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
** ice_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
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_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
----- End forwarded message -----
_______________________________________________
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http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
Jonathan Gregory
2015-02-25 20:14:47 UTC
Permalink
Dear Alejandro

That looks good to me. Thanks. Yes, I agree, you might see "ice" used for
other frozen substances than water (including "dry ice") but I don't believe
we use it in that more general sense in CF standard names.

Best wishes

Jonathan
Date: Tue, 24 Feb 2015 10:14:21 +0000
Subject: RE: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and
ice cloud fractions
Dear Jonathan,
Thanks for your comment. When I proposed ice_water_cloud I was trying to keep the same format for both phases, but I ice_cloud seems fine to me (I've seen 'ice' used for other compounds, but perhaps it's not correct).
- liquid_water_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_water_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Regards,
Alejandro
-----Original Message-----
Jonathan Gregory
Sent: 24 February 2015 06:47
Subject: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and ice cloud
fractions
Dear Alejandro
I think that liquid_water_cloud would be preferable to liquid_cloud, on
grounds of consistency as you say, and also clarity. liquid_water is a phrase
used in many standard names to refer to cloud composition e.g.
atmosphere_mass_content_of_convective_cloud_liquid_water
to give just one example. What would ice_water_cloud mean? The phrase
ice_cloud is used in the existing standard_name
number_concentration_of_ice_crystals_in_air_at_ice_cloud_top
so I think ice_cloud would be OK to use if that's what you mean.
Best wishes
Jonathan
----- Forwarded message from "Bodas-Salcedo, Alejandro"
Date: Mon, 23 Feb 2015 11:25:21 +0000
Subject: Re: [CF-metadata] Proposal for standard names: liquid and ice cloud
fractions
Dear Martin,
Thanks for pointing me to that thread, it was very useful. The standard names I
am proposing are similar in concept to the existing
'thickness_of_liquid_water_cloud', so I guess the proposed names make sense.
- liquid_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Or
- liquid_water_cloud_area_fraction
- ice_water _cloud_area_fraction
- liquid_water _cloud_area_fraction_in_atmosphere_layer
- ice_water_cloud_area_fraction_in_atmosphere_layer
The second set of names seems to be more consistent with existing names.
Regards,
Alejandro
-----Original Message-----
Martin Raspaud
Sent: 21 February 2015 21:24
Subject: Re: [CF-metadata] Proposal for standard names: liquid and ice cloud
fractions
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Alejandro,
Not sure it's related, but there was a thread on cloud physical
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/048566.html
Best regards,
Martin
Post by Bodas-Salcedo, Alejandro
Dear All,
I would like to propose new standard names for liquid and ice cloud
fractions (as far as I can see, they don't exist). I am not sure if
they follow the spirit of the CF conventions because cloud phase is
not a well defined concept. I would appreciate your comments on
this.
Regards,
Alejandro
** liquid_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** ice_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** liquid_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
** ice_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
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_______________________________________________
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Bodas-Salcedo, Alejandro
2016-03-09 11:16:01 UTC
Permalink
Dear Alison and CF community,

Please could you let me know what's the status of these names? Are they ready to go into the next update of the standard names table?

Thanks,

Alejandro
-----Original Message-----
Jonathan Gregory
Sent: 25 February 2015 20:15
Subject: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and ice cloud
fractions
Dear Alejandro
That looks good to me. Thanks. Yes, I agree, you might see "ice" used for
other frozen substances than water (including "dry ice") but I don't believe
we use it in that more general sense in CF standard names.
Best wishes
Jonathan
----- Forwarded message from "Bodas-Salcedo, Alejandro"
Date: Tue, 24 Feb 2015 10:14:21 +0000
Subject: RE: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and
ice cloud fractions
Dear Jonathan,
Thanks for your comment. When I proposed ice_water_cloud I was trying to keep
the same format for both phases, but I ice_cloud seems fine to me (I've seen 'ice'
used for other compounds, but perhaps it's not correct).
- liquid_water_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_water_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Regards,
Alejandro
-----Original Message-----
Jonathan Gregory
Sent: 24 February 2015 06:47
Subject: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and ice
cloud
fractions
Dear Alejandro
I think that liquid_water_cloud would be preferable to liquid_cloud, on
grounds of consistency as you say, and also clarity. liquid_water is a phrase
used in many standard names to refer to cloud composition e.g.
atmosphere_mass_content_of_convective_cloud_liquid_water
to give just one example. What would ice_water_cloud mean? The phrase
ice_cloud is used in the existing standard_name
number_concentration_of_ice_crystals_in_air_at_ice_cloud_top
so I think ice_cloud would be OK to use if that's what you mean.
Best wishes
Jonathan
----- Forwarded message from "Bodas-Salcedo, Alejandro"
Date: Mon, 23 Feb 2015 11:25:21 +0000
Subject: Re: [CF-metadata] Proposal for standard names: liquid and ice cloud
fractions
Dear Martin,
Thanks for pointing me to that thread, it was very useful. The standard names
I
am proposing are similar in concept to the existing
'thickness_of_liquid_water_cloud', so I guess the proposed names make sense.
- liquid_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Or
- liquid_water_cloud_area_fraction
- ice_water _cloud_area_fraction
- liquid_water _cloud_area_fraction_in_atmosphere_layer
- ice_water_cloud_area_fraction_in_atmosphere_layer
The second set of names seems to be more consistent with existing names.
Regards,
Alejandro
-----Original Message-----
Behalf Of
Martin Raspaud
Sent: 21 February 2015 21:24
Subject: Re: [CF-metadata] Proposal for standard names: liquid and ice
cloud
fractions
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Alejandro,
Not sure it's related, but there was a thread on cloud physical
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2011/048566.html
Best regards,
Martin
Post by Bodas-Salcedo, Alejandro
Dear All,
I would like to propose new standard names for liquid and ice cloud
fractions (as far as I can see, they don't exist). I am not sure if
they follow the spirit of the CF conventions because cloud phase is
not a well defined concept. I would appreciate your comments on
this.
Regards,
Alejandro
** liquid_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** ice_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere column,
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** liquid_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
** ice_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that have
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied by
X. "X_area" means the horizontal area occupied by X within the grid
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
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_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
----- End forwarded message -----
_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
----- End forwarded message -----
_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
a***@stfc.ac.uk
2016-04-21 14:27:20 UTC
Permalink
Dear Alejandro,

Apologies for the delay in replying to your question. I can confirm that these names, units and definitions are all accepted for inclusion in the standard name table (see http://cfeditor.ceda.ac.uk/proposals/1?status=accepted&namefilter=&proposerfilter=Alejandro&descfilter=&unitfilter=&yearfilter=&commentfilter=&filter+and+display=Filter) for up to date status.

The names will be added in the next update of the table, scheduled for May 17th.

Best wishes,
Alison

------
Alison Pamment Tel: +44 1235 778065
Centre for Environmental Data Analysis Email: ***@stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Campus, Didcot, OX11 0QX, U.K.
-----Original Message-----
Of Bodas-Salcedo, Alejandro
Sent: 09 March 2016 11:16
Subject: Re: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and
ice cloud fractions
Dear Alison and CF community,
Please could you let me know what's the status of these names? Are they
ready to go into the next update of the standard names table?
Thanks,
Alejandro
-----Original Message-----
Behalf Of
Jonathan Gregory
Sent: 25 February 2015 20:15
Subject: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and
ice cloud
fractions
Dear Alejandro
That looks good to me. Thanks. Yes, I agree, you might see "ice" used for
other frozen substances than water (including "dry ice") but I don't believe
we use it in that more general sense in CF standard names.
Best wishes
Jonathan
----- Forwarded message from "Bodas-Salcedo, Alejandro"
Date: Tue, 24 Feb 2015 10:14:21 +0000
Subject: RE: [CF-metadata] Fwd: Re: Proposal for standard names: liquid
and
ice cloud fractions
Dear Jonathan,
Thanks for your comment. When I proposed ice_water_cloud I was trying
to keep
the same format for both phases, but I ice_cloud seems fine to me (I've
seen 'ice'
used for other compounds, but perhaps it's not correct).
- liquid_water_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_water_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Regards,
Alejandro
-----Original Message-----
Behalf Of
Jonathan Gregory
Sent: 24 February 2015 06:47
Subject: [CF-metadata] Fwd: Re: Proposal for standard names: liquid
and ice
cloud
fractions
Dear Alejandro
I think that liquid_water_cloud would be preferable to liquid_cloud, on
grounds of consistency as you say, and also clarity. liquid_water is a
phrase
used in many standard names to refer to cloud composition e.g.
atmosphere_mass_content_of_convective_cloud_liquid_water
to give just one example. What would ice_water_cloud mean? The
phrase
ice_cloud is used in the existing standard_name
number_concentration_of_ice_crystals_in_air_at_ice_cloud_top
so I think ice_cloud would be OK to use if that's what you mean.
Best wishes
Jonathan
----- Forwarded message from "Bodas-Salcedo, Alejandro"
Date: Mon, 23 Feb 2015 11:25:21 +0000
From: "Bodas-Salcedo, Alejandro"
Subject: Re: [CF-metadata] Proposal for standard names: liquid and
ice cloud
fractions
Dear Martin,
Thanks for pointing me to that thread, it was very useful. The
standard names
I
am proposing are similar in concept to the existing
'thickness_of_liquid_water_cloud', so I guess the proposed names
make sense.
- liquid_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Or
- liquid_water_cloud_area_fraction
- ice_water _cloud_area_fraction
- liquid_water _cloud_area_fraction_in_atmosphere_layer
- ice_water_cloud_area_fraction_in_atmosphere_layer
The second set of names seems to be more consistent with existing
names.
Regards,
Alejandro
-----Original Message-----
Behalf Of
Martin Raspaud
Sent: 21 February 2015 21:24
Subject: Re: [CF-metadata] Proposal for standard names: liquid and
ice
cloud
fractions
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Alejandro,
Not sure it's related, but there was a thread on cloud physical
http://mailman.cgd.ucar.edu/pipermail/cf-
metadata/2011/048566.html
Best regards,
Martin
Post by Bodas-Salcedo, Alejandro
Dear All,
I would like to propose new standard names for liquid and ice
cloud
Post by Bodas-Salcedo, Alejandro
fractions (as far as I can see, they don't exist). I am not sure if
they follow the spirit of the CF conventions because cloud phase
is
Post by Bodas-Salcedo, Alejandro
not a well defined concept. I would appreciate your comments on
this.
Regards,
Alejandro
** liquid_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied
by
Post by Bodas-Salcedo, Alejandro
X. "X_area" means the horizontal area occupied by X within the
grid
Post by Bodas-Salcedo, Alejandro
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere
column,
Post by Bodas-Salcedo, Alejandro
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** ice_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied
by
Post by Bodas-Salcedo, Alejandro
X. "X_area" means the horizontal area occupied by X within the
grid
Post by Bodas-Salcedo, Alejandro
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere
column,
Post by Bodas-Salcedo, Alejandro
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** liquid_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that
have
Post by Bodas-Salcedo, Alejandro
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied
by
Post by Bodas-Salcedo, Alejandro
X. "X_area" means the horizontal area occupied by X within the
grid
Post by Bodas-Salcedo, Alejandro
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
** ice_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that
have
Post by Bodas-Salcedo, Alejandro
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied
by
Post by Bodas-Salcedo, Alejandro
X. "X_area" means the horizontal area occupied by X within the
grid
Post by Bodas-Salcedo, Alejandro
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
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_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
----- End forwarded message -----
_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
----- End forwarded message -----
_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
Bodas-Salcedo, Alejandro
2016-04-21 14:53:22 UTC
Permalink
Dear Alison,

That's great. Thank you very much for your reply.

Regards,

Alejandro
-----Original Message-----
Sent: 21 April 2016 15:27
Subject: RE: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and ice
cloud fractions
Dear Alejandro,
Apologies for the delay in replying to your question. I can confirm that these names,
units and definitions are all accepted for inclusion in the standard name table (see
http://cfeditor.ceda.ac.uk/proposals/1?status=accepted&namefilter=&proposerfilter=
Alejandro&descfilter=&unitfilter=&yearfilter=&commentfilter=&filter+and+display=Fil
ter) for up to date status.
The names will be added in the next update of the table, scheduled for May 17th.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Campus, Didcot, OX11 0QX, U.K.
-----Original Message-----
Of Bodas-Salcedo, Alejandro
Sent: 09 March 2016 11:16
Subject: Re: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and
ice cloud fractions
Dear Alison and CF community,
Please could you let me know what's the status of these names? Are they
ready to go into the next update of the standard names table?
Thanks,
Alejandro
-----Original Message-----
Behalf Of
Jonathan Gregory
Sent: 25 February 2015 20:15
Subject: [CF-metadata] Fwd: Re: Proposal for standard names: liquid and
ice cloud
fractions
Dear Alejandro
That looks good to me. Thanks. Yes, I agree, you might see "ice" used for
other frozen substances than water (including "dry ice") but I don't believe
we use it in that more general sense in CF standard names.
Best wishes
Jonathan
----- Forwarded message from "Bodas-Salcedo, Alejandro"
Date: Tue, 24 Feb 2015 10:14:21 +0000
Subject: RE: [CF-metadata] Fwd: Re: Proposal for standard names: liquid
and
ice cloud fractions
Dear Jonathan,
Thanks for your comment. When I proposed ice_water_cloud I was trying
to keep
the same format for both phases, but I ice_cloud seems fine to me (I've
seen 'ice'
used for other compounds, but perhaps it's not correct).
- liquid_water_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_water_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Regards,
Alejandro
-----Original Message-----
Behalf Of
Jonathan Gregory
Sent: 24 February 2015 06:47
Subject: [CF-metadata] Fwd: Re: Proposal for standard names: liquid
and ice
cloud
fractions
Dear Alejandro
I think that liquid_water_cloud would be preferable to liquid_cloud, on
grounds of consistency as you say, and also clarity. liquid_water is a
phrase
used in many standard names to refer to cloud composition e.g.
atmosphere_mass_content_of_convective_cloud_liquid_water
to give just one example. What would ice_water_cloud mean? The
phrase
ice_cloud is used in the existing standard_name
number_concentration_of_ice_crystals_in_air_at_ice_cloud_top
so I think ice_cloud would be OK to use if that's what you mean.
Best wishes
Jonathan
----- Forwarded message from "Bodas-Salcedo, Alejandro"
Date: Mon, 23 Feb 2015 11:25:21 +0000
From: "Bodas-Salcedo, Alejandro"
Subject: Re: [CF-metadata] Proposal for standard names: liquid and
ice cloud
fractions
Dear Martin,
Thanks for pointing me to that thread, it was very useful. The
standard names
I
am proposing are similar in concept to the existing
'thickness_of_liquid_water_cloud', so I guess the proposed names
make sense.
- liquid_cloud_area_fraction
- ice_cloud_area_fraction
- liquid_cloud_area_fraction_in_atmosphere_layer
- ice_cloud_area_fraction_in_atmosphere_layer
Or
- liquid_water_cloud_area_fraction
- ice_water _cloud_area_fraction
- liquid_water _cloud_area_fraction_in_atmosphere_layer
- ice_water_cloud_area_fraction_in_atmosphere_layer
The second set of names seems to be more consistent with existing
names.
Regards,
Alejandro
-----Original Message-----
Behalf Of
Martin Raspaud
Sent: 21 February 2015 21:24
Subject: Re: [CF-metadata] Proposal for standard names: liquid and
ice
cloud
fractions
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Alejandro,
Not sure it's related, but there was a thread on cloud physical
http://mailman.cgd.ucar.edu/pipermail/cf-
metadata/2011/048566.html
Best regards,
Martin
Post by Bodas-Salcedo, Alejandro
Dear All,
I would like to propose new standard names for liquid and ice
cloud
Post by Bodas-Salcedo, Alejandro
fractions (as far as I can see, they don't exist). I am not sure if
they follow the spirit of the CF conventions because cloud phase
is
Post by Bodas-Salcedo, Alejandro
not a well defined concept. I would appreciate your comments on
this.
Regards,
Alejandro
** liquid_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied
by
Post by Bodas-Salcedo, Alejandro
X. "X_area" means the horizontal area occupied by X within the
grid
Post by Bodas-Salcedo, Alejandro
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere
column,
Post by Bodas-Salcedo, Alejandro
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** ice_cloud_area_fraction
"X_area_fraction" means the fraction of horizontal area occupied
by
Post by Bodas-Salcedo, Alejandro
X. "X_area" means the horizontal area occupied by X within the
grid
Post by Bodas-Salcedo, Alejandro
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover". The cloud area fraction is for the whole atmosphere
column,
Post by Bodas-Salcedo, Alejandro
as seen from the surface or the top of the atmosphere. The cloud
area fraction in a layer of the atmosphere has the standard name
cloud_area_fraction_in_atmosphere_layer.
Units: 1
** liquid_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that
have
Post by Bodas-Salcedo, Alejandro
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied
by
Post by Bodas-Salcedo, Alejandro
X. "X_area" means the horizontal area occupied by X within the
grid
Post by Bodas-Salcedo, Alejandro
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
** ice_cloud_area_fraction_in_atmosphere_layer
"Layer" means any layer with upper and lower boundaries that
have
Post by Bodas-Salcedo, Alejandro
constant values in some vertical coordinate. There must be a
vertical coordinate variable indicating the extent of the layer(s).
If the layers are model layers, the vertical coordinate can be
model_level_number, but it is recommended to specify a physical
coordinate (in a scalar or auxiliary coordinate variable) as well.
"X_area_fraction" means the fraction of horizontal area occupied
by
Post by Bodas-Salcedo, Alejandro
X. "X_area" means the horizontal area occupied by X within the
grid
Post by Bodas-Salcedo, Alejandro
cell. Cloud area fraction is also called "cloud amount" and "cloud
cover".
Units: 1
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-----END PGP SIGNATURE-----
_______________________________________________
CF-metadata mailing list
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
----- End forwarded message -----
_______________________________________________
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http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
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