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CICE-Consortium / CICE

Development repository for the CICE sea-ice model
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input data: cloud fraction (cldf) #269

Closed nowhere95 closed 5 years ago

nowhere95 commented 5 years ago

I've created historical forcing data from ERA-interim.

I used the total cloud cover of ERA-interim (which is mostly higher than 0.9 over the Arctic) for cloud fraction (cldf), an input variable of CICE. Then, sea ice grows rapidly and becomes thicker than 10 meters within 10 years. This is probably because ERA-interim's total cloud fraction is too high (higher than 0.9), which substantially weakens incoming shortwave radiation to the surface. In July, CICE-simulated shortwave to the surface is only around 150 W/m2, which is far small than the usual (250 W/m2).

The summer shortwave radiation at the surface was simulated reasonably well in the case when I used ERA-interim's high cloud cover (which is around 0.6-0.7). Am I supposed to use high cloud cover for the CICE cloud fraction (cldf)?

dabail10 commented 5 years ago

I have answered this on the CICE Consortium bulletin board.

https://bb.cgd.ucar.edu/cloud-fraction-offline-cice

phil-blain commented 4 years ago

New forum link : https://xenforo.cgd.ucar.edu/cesm/threads/cloud-fraction-of-offline-cice.4609/