Adjusting SST fields when decreasing sea ice fraction in the input data set

[judykeystsai@gmail_com]

 Hi there,I have some questions about changing the prescribed sea ice fraction in the input data set for CAM (with F compset). I’m wondering if I decrease the sea ice fraction for some regions, how should I properly adjust the SST with the decreasing sea ice fraction in order to avoid thermal imbalance for the model? Is there anyway (such as a statistical relationship between sea ice and SST) that CESM community uses for the model? Any suggestion is welcomedThank you 

 

[hannay]

This should be done very caerfully otherwise you will end up with weird behavior especially around teh sea-ice edge. You could try to use the empirical relationship between SST and sea-ice described:James W. Hurrell, James J. Hack, Dennis Shea, Julie M. Caron, and James Rosinski, 2008: A New Sea Surface Temperature and Sea Ice Boundary Dataset for the Community Atmosphere Model. J. Climate, 21, 5145–5153. doi: http://dx.doi.org/10.1175/2008JCLI2292.1

 

[hannay]

This should be done very caerfully otherwise you will end up with weird behavior especially around teh sea-ice edge. You could try to use the empirical relationship between SST and sea-ice described:James W. Hurrell, James J. Hack, Dennis Shea, Julie M. Caron, and James Rosinski, 2008: A New Sea Surface Temperature and Sea Ice Boundary Dataset for the Community Atmosphere Model. J. Climate, 21, 5145–5153. doi: http://dx.doi.org/10.1175/2008JCLI2292.1

 

[fyke@lanl_gov]

Hi there,We would like to generate SST/SIC boundary conditions for F-compset simulations, with SST/SIC fields based on composite monthly climatologies from the CESM LE control simulation (where the compositing was carried out on high/low Southern Ocean sea ice concentration, FYI).Question: is the 'time-diddling' procedure advisable to perform on these model-derived climatologies?  I naively assume the answer is 'yes', in order to avoid the 'clipping' of warm/cold simulated extremes.If I am correct, do you have suggestions for applying the tools in the cesm1_5_beta02 directory:    components/cam/tools/icesstto this task, given than we have already generated 12-month climatologies on the standard 288/192 CAM FV grid?Thanks for any help! 

 

[fyke@lanl_gov]

Hi there,We would like to generate SST/SIC boundary conditions for F-compset simulations, with SST/SIC fields based on composite monthly climatologies from the CESM LE control simulation (where the compositing was carried out on high/low Southern Ocean sea ice concentration, FYI).Question: is the 'time-diddling' procedure advisable to perform on these model-derived climatologies?  I naively assume the answer is 'yes', in order to avoid the 'clipping' of warm/cold simulated extremes.If I am correct, do you have suggestions for applying the tools in the cesm1_5_beta02 directory:    components/cam/tools/icesstto this task, given than we have already generated 12-month climatologies on the standard 288/192 CAM FV grid?Thanks for any help! 

 

[hannay]

The didling procedure is to insure that you will reproduce the monthly means from the CESM LE control simulation. So, it depends if this is important for your purpose.I don't think it is possible to apply the diddling to a 12-month climatology. I believe you need to use teh whole timeseries. 

 

[hannay]

The didling procedure is to insure that you will reproduce the monthly means from the CESM LE control simulation. So, it depends if this is important for your purpose.I don't think it is possible to apply the diddling to a 12-month climatology. I believe you need to use teh whole timeseries.