[CF-metadata] New sea ice variable definitions (CMIP6 SIMIP)

[Alexandra Jahn]

Dear CF community,

to more specifically describe sea-ice output from climate-model simulations for the CMIP6 Sea-Ice MIP (SIMIP), we would like to propose the following additional new CF standard names (as part of the SIMIP CMIP6 data request).
1. magnitude_of_sea_ice_normal_stress: Average normal stress in sea ice (first stress invariant), units 'N m-1’. This is a horizontal stress, which is perpendicular/normal to each of the vertices making up the a grid cell in the horizontal plane. The average represent the spatial average stress. Cell_method attribute "area: average”
2. magnitude_of_sea_ice_shear_stress: Maximum shear stress in sea ice (second stress invariant), units 'N m-1’. This is a horizontal shear, the areal maximum shear of the normal and shear stress stress acting on the vertices of a grid. Cell_method attribute "area: maximum”.
3. magnitude_of_sea_ice_velocity_shear: Maximum shear of sea-ice velocity field (second shear strain invariant)(new variable with units '1/s’). This is the areal maximum shear strain rate in the horizontal plane of the sea ice. Cell_method attribute "area: maximum”
Thank you very much for your feedback, guidance and input.

With best wishes, for the SIMIP Steering Committee,

Alexandra Jahn


Alexandra Jahn
Assistant Professor, Department of Atmospheric and Oceanic Sciences
INSTAAR Fellow
University of Colorado Boulder
Campus Box 450
Boulder, CO 80309-0450 USA
***@colorado.edu<mailto:***@colorado.edu>
Phone: [phone]
http://instaar.colorado.edu/people/alexandra-jahn/

[Jonathan Gregory]

Dear Alexandra

Thanks for the proposals. As we have discussed, I think the standard names
are fine. For CMIP6 and SIMIP it is perfectly OK to specify the cell_methods
for the diagnostics you want. The standard_name definitions, however, should
not include mean, maximum, etc. or the specification of cell_methods. The
standard_name and cell_methods together describe the diagnostics.

Best wishes

Jonathan

Date: Fri, 12 Aug 2016 19:44:12 +0000
Subject: [CF-metadata] New sea ice variable definitions (CMIP6 SIMIP)
Dear CF community,
to more specifically describe sea-ice output from climate-model simulations for the CMIP6 Sea-Ice MIP (SIMIP), we would like to propose the following additional new CF standard names (as part of the SIMIP CMIP6 data request).
1. magnitude_of_sea_ice_normal_stress: Average normal stress in sea ice (first stress invariant), units 'N m-1’. This is a horizontal stress, which is perpendicular/normal to each of the vertices making up the a grid cell in the horizontal plane. The average represent the spatial average stress. Cell_method attribute "area: average”
2. magnitude_of_sea_ice_shear_stress: Maximum shear stress in sea ice (second stress invariant), units 'N m-1’. This is a horizontal shear, the areal maximum shear of the normal and shear stress stress acting on the vertices of a grid. Cell_method attribute "area: maximum”.
3. magnitude_of_sea_ice_velocity_shear: Maximum shear of sea-ice velocity field (second shear strain invariant)(new variable with units '1/s’). This is the areal maximum shear strain rate in the horizontal plane of the sea ice. Cell_method attribute "area: maximum”
Thank you very much for your feedback, guidance and input.
With best wishes, for the SIMIP Steering Committee,
Alexandra Jahn
Alexandra Jahn
Assistant Professor, Department of Atmospheric and Oceanic Sciences
INSTAAR Fellow
University of Colorado Boulder
Campus Box 450
Boulder, CO 80309-0450 USA
Phone: [phone]
http://instaar.colorado.edu/people/alexandra-jahn/
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