SIC budget analysis in the CICE model

[Yongwu]

I have one model experiment is performed from 1980 to 2020 without any sea ice data assimilation. Two types of output are saved, the monthly mean and daily mean. The monthly output includes sea ice concentration and other diagnostic variables (e.g., sea ice area tendency due to thermodynamical (daidtt) and dynamical process(daidtd)). However, the daily output only includes sea ice concentration, with no daidtt or daidtd data saved.

My questions:

• Can I utilize daidtt and daidtd from the monthly output to calculate sea ice concentration changes between two days or two months? For example, in April 1980, is the cumulative effect of (daidtt + daidtd) over 30 days the same as the sea ice concentration difference between April 1st and April 30th ?
• How many processes are included in the daidtt and daidtd? In other words, what is the formula of daidtt and daidtd embedded in CICE?

I try to find relevant information, but unfortunately, I have not been successful thus far.

Best wishes,
Yongwu

 

[dbailey]

The terms daidtt and dadtd contain all of the thermodynamic (step_therm1, step_therm2) and dynamic (ridging, advection) processes respectively. You can see where these are computed in ice_step_mod.F90. The monthly mean is not really the same as April 30th - April 1st. I think your best bet is to rerun the experiment and add these to the daily stream.