[CF-metadata] standard_names for wind stress curl, wind stress divergence

[Bruce Hackett]

Picking this up again after a long silence.

I have been discussing this with my colleagues at KNMI and have gotten some
comments from Alison Pamment (thanks). The conclusion is that we would like
to revise the suggestion somewhat.

The proposal for the wind stress divergence is essentially unchanged, we
just add the units.

The proposal for the wind stress curl is modified to bring it in line with
what we are producing, which is the vertical component (indeed a scalar!).

We hope this will be acceptable to the community.

The revised proposal is:
-------------------------------

standard_name: divergence_of_surface_downward_stress
units: N/m^3
Description: 'The divergence is a signed scalar that represents the
magnitude of the 2D surface wind downward stress vector field's source
(positive) or sink (negative) at a given point. The surface called
"surface" means the lower boundary of the atmosphere. "Downward" indicates
a downward flux of momentum, which accelerates the lower medium along the
vector and the upper medium against the vector. The surface downward stress
is the wind stress on the surface.'

--------------------------------

standard_name: vertical_component_of_surface_downward_stress_curl
units: N/m^3
'The vertical component of the stress curl is a signed scalar that
represents the magnitude of the 2D surface wind downward stress vector
field's local anti-clock-wise rotation at a given point; clockwise rotation
is thus given as negative curl. The surface called "surface" means the
lower boundary of the atmosphere. "Downward" indicates a downward flux of
momentum, which accelerates the lower medium along the vector and the upper
medium against the vector. The surface downward stress is the wind stress
on the surface.'
Best regards,
Bruce

Here are proposed definitions provided by my colleague Ad Stoffelen at
-------------------------------
divergence_of_surface_downward_stress
The divergence is a signed scalar that represents the magnitude of the 2D
surface wind downward stress vector field's source (positive) or sink
(negative) at a given point. The surface called "surface" means the lower
boundary of the atmosphere. "Downward" indicates a downward flux of
momentum, which accelerates the lower medium along the vector and the upper
medium against the vector. The surface downward stress is the wind stress
on the surface.
--------------------------------
curl_of_surface_downward_stress
The curl is a signed scalar that represents the magnitude of the 2D
surface wind downward stress vector field's local anti-clock-wise rotation
at a given point; clockwise rotation is thus given as negative curl. The
surface called "surface" means the lower boundary of the atmosphere.
"Downward" indicates a downward flux of momentum, which accelerates the
lower medium along the vector and the upper medium against the vector. The
surface downward stress is the wind stress on the surface.
Best regards,
Bruce
----------------------------------------------------------------------

Message: 1
Date: Tue, 19 Jan 2016 16:41:17 +0000
Subject: [CF-metadata] standard_names for wind stress curl, wind
stress divergence
Content-Type: text/plain; charset=us-ascii
Dear Bruce

If there are indeed no standard_names that are appropriate, I would
divergence_of_surface_downward_stress
curl_of_surface_downward_stress

I don't think we have named those before and your proposals look like the
natural choice to me. If you could provide definitions (like those most
quantities have in the table) and canonical units that will constitute a
proposal. People may then comment and when it seems that the discussion is
over, if they are agreed, they'll be added to the list.
Best wishes and thanks
Jonathan

--
------------------------------------------------------------------------
Bruce Hackett Senior Scientist
Norwegian Meteorological Institute (MET Norway), R & D Dept.
N-0313 Oslo Phone: [phone]
NORWAY Fax: [phone]
------------------------------------------------------------------------

--
------------------------------------------------------------------------
Bruce Hackett Senior Scientist
Norwegian Meteorological Institute (MET Norway), R & D Dept.
P.O. Box 43 - Blindern e-mail: bruceh (at) met (dot) no
N-0313 Oslo Phone: [phone]
NORWAY Fax: [phone]
------------------------------------------------------------------------

Here are proposed definitions provided by my colleague Ad Stoffelen at
-------------------------------
divergence_of_surface_downward_stress
The divergence is a signed scalar that represents the magnitude of the 2D
surface wind downward stress vector field's source (positive) or sink
(negative) at a given point. The surface called "surface" means the lower
boundary of the atmosphere. "Downward" indicates a downward flux of
momentum, which accelerates the lower medium along the vector and the upper
medium against the vector. The surface downward stress is the wind stress
on the surface.
--------------------------------
curl_of_surface_downward_stress
The curl is a signed scalar that represents the magnitude of the 2D
surface wind downward stress vector field's local anti-clock-wise rotation
at a given point; clockwise rotation is thus given as negative curl. The
surface called "surface" means the lower boundary of the atmosphere.
"Downward" indicates a downward flux of momentum, which accelerates the
lower medium along the vector and the upper medium against the vector. The
surface downward stress is the wind stress on the surface.
Best regards,
Bruce
----------------------------------------------------------------------

Message: 1
Date: Tue, 19 Jan 2016 16:41:17 +0000
Subject: [CF-metadata] standard_names for wind stress curl, wind
stress divergence
Content-Type: text/plain; charset=us-ascii
Dear Bruce

If there are indeed no standard_names that are appropriate, I would
divergence_of_surface_downward_stress
curl_of_surface_downward_stress

I don't think we have named those before and your proposals look like the
natural choice to me. If you could provide definitions (like those most
quantities have in the table) and canonical units that will constitute a
proposal. People may then comment and when it seems that the discussion is
over, if they are agreed, they'll be added to the list.
Best wishes and thanks
Jonathan

--
------------------------------------------------------------------------
Bruce Hackett Senior Scientist
Norwegian Meteorological Institute (MET Norway), R & D Dept.
N-0313 Oslo Phone: [phone]
NORWAY Fax: [phone]
------------------------------------------------------------------------

[Jonathan Gregory]

Dear Bruce

Post by Bruce Hackett
divergence_of_surface_downward_stress

looks fine. We have a couple of other divergence_of_X names. In view of this,
would it be OK to have

Post by Bruce Hackett
vertical_component_of_curl_of_surface_downward_stress

instead of

Post by Bruce Hackett
vertical_component_of_surface_downward_stress_curl

for consistency of syntax, although it's slightly more cumbersome?

Best wishes and thanks

Jonathan

[Bruce Hackett]

Dear Jonathan,

Yes, I considered "vertical_component_of_curl_of_surface_downward_stress"
too, but decided to propose the shorter one. I quite understand your desire
for consistency of formulation and have no problem accepting your
alternative. However, since we have already tooled up for my proposal, it
would be more *convenient* for us if you choose
"vertical_component_of_surface_downward_stress_curl". Perhaps you could
define it as an alias? Your call.

Best regards,
Bruce

Dear Bruce

Post by Bruce Hackett
divergence_of_surface_downward_stress

looks fine. We have a couple of other divergence_of_X names. In view of this,
would it be OK to have

Post by Bruce Hackett
vertical_component_of_curl_of_surface_downward_stress

instead of

Post by Bruce Hackett
vertical_component_of_surface_downward_stress_curl

for consistency of syntax, although it's slightly more cumbersome?
Best wishes and thanks
Jonathan

[Jonathan Gregory]

Dear Bruce

Sorry for slow response. I think Alison's comment would be helpful. I don't
have a strong opinion.

Best wishes

Jonathan

Date: Wed, 28 Sep 2016 14:46:33 +0200
Subject: Re: [CF-metadata] standard_names for wind stress curl, wind stress
divergence
Dear Jonathan,
Yes, I considered "vertical_component_of_curl_of_surface_downward_stress"
too, but decided to propose the shorter one. I quite understand your desire
for consistency of formulation and have no problem accepting your
alternative. However, since we have already tooled up for my proposal, it
would be more *convenient* for us if you choose
"vertical_component_of_surface_downward_stress_curl". Perhaps you could
define it as an alias? Your call.
Best regards,
Bruce

Dear Bruce

Post by Bruce Hackett
divergence_of_surface_downward_stress

looks fine. We have a couple of other divergence_of_X names. In view of this,
would it be OK to have

Post by Bruce Hackett
vertical_component_of_curl_of_surface_downward_stress

instead of

Post by Bruce Hackett
vertical_component_of_surface_downward_stress_curl

for consistency of syntax, although it's slightly more cumbersome?
Best wishes and thanks
Jonathan

--
------------------------------------------------------------------------
Bruce Hackett Senior Scientist
Norwegian Meteorological Institute (MET Norway), R & D Dept.
P.O. Box 43 - Blindern e-mail: bruceh (at) met (dot) no
N-0313 Oslo Phone: [phone]
NORWAY Fax: [phone]
------------------------------------------------------------------------