Dear Alison > Therefore, I think we > should introduce a new standard name of > surface_downward_heat_flux_in_snow (Wm-2). The CMIP5 output can then use > a cell_methods of "area: mean where land". OK?
I agree. > (a) Long name 'Surface Temperature of Sea Ice' with units of K and the > following explanatory comments: 'When computing the time-mean here, the > time-samples, weighted by the area of sea ice in the grid cell, are > accumulated and then divided by the sum of the weights. Report as > "missing" in regions free of sea ice. Note this will be the surface > snow temperature in regions where snow covers the sea ice.' > (b) Long name 'Temperature at Interface Between Sea Ice and Snow' with > units of K and the following explanatory comments: 'When computing the > time-mean here, the time-samples, weighted by the area of snow-covered > sea ice in the grid cell, are accumulated and then divided by the sum of > the weights. Report as "missing" in regions free of snow-covered sea > ice.' It seems to me that (a) is surface_temperature for area: where sea_ice, and (b) is sea_ice_surface_temperature for area: where snow_on_sea_ice, in which I have invented a new area_type. Both are time: mean. > 6. Water flux names > > I think we should use the > existing standard names of > rainfall_flux; kg m-2 s-1 > snowfall_flux; kg m-2 s-1 > and supply a cell_methods attribute of "area: mean where sea_ice over > sea" for each of them. Does that seem more sensible? Yes, I agree. That seems to be exactly what the CMIP5 description says. Thanks. > 8. Sea ice thermal energy > > According to the CMIP5 document, the unit is J and the long name is 'Sea > Ice Total Heat Content'. The explanation says, 'Ice at 0 Celsius is > assumed taken to have a heat content of 0 J. When averaging over time, > this quantity is weighted by the mass of sea ice. Report as "missing" > in regions free of snow on land.' > > I find this rather confusing - if it is supposed to be a sea ice > quantity, then surely it should always be reported as "missing" over > land and open sea. It doesn't sound as though latent heat is included. > I don't think we can call it a 'content' because it isn't a quantity per > unit area. Perhaps Siobhan can help to clarify this quantity further. It is unusual to report a quantity extensive in area, isn't it. Things are usually intensive i.e. m-2. > 9. Bare Sea Ice Albedo > > Perhaps it would be more > accurate to use the existing name 'sea_ice_albedo' and introduce a new > area_type of 'snow_free_ice'. I think that would be a correct description, yes. This area-type is the counterpart of snow_on_sea_ice which I needed above. I think yours should be snow_free_sea_ice. > 10. X and y components of stress on sea ice surface and base > We already have existing names > surface_downward_x_stress; Pa > surface_downward_y_stress; Pa > which we can use for the first two quantities. > > I now propose that we introduce two new standard names > upward_x_stress_at_sea_ice_base; Pa > upward_y_stress_at_sea_ice_base; Pa. > > I think also that for CMIP5 these four quantities should be accompanied > by a cell_methods attribute of "area: mean where sea_ice". > > Is this OK? I would say so, yes. Best wishes Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
