[RegCNET] cloud coverage

[Prodromos Zanis]

Dear Gao

In order to calculate total column fraction cloud cover you can use the farctional cloud cover from each model level with the following way:

Total column FC =1-[(1-fc(z=1))*(1-fc(z=2))*(1-fc(z=3))*(1-fc(z=4))*(1-fc(z=5))*(1-fc(z=6))*(1-fc(z=7))*(1-fc(z=8))*(1-fc(z=9))*(1-fc(z=10))*(1-fc(z=11))]
In this examble 11 model levels are assumed.

You should NOT do simply sum of FC in the model levels to calculate Total column FC.

Best wishes
Prodromos

  ----- Original Message ----- 
  From: gaoxj at cma.gov.cn 
  To: regcnet at lists.ictp.it 
  Sent: Wednesday, February 03, 2010 5:34 AM
  Subject: [RegCNET] cloud coverage


  Dear all,

  The cloud coverage in RegCM is caculated and output in each vertical layers. Then if I want to know the total cloud cover, should I pick the maxima among the layers, or should I do average of the layers?

  Thanks ahead for your reply.

  Best regards,

  Gao


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