[RegCNET] cloud coverage

[gaoxj at cma.gov.cn]

Hi Bamba,

So this is what Prodromos suggested. Thanks a lot!

Cheers,

Gao

  ----- Original Message ----- 
  From: Bamba Sylla 
  To: gaoxj at cma.gov.cn 
  Cc: regcnet at lists.ictp.it 
  Sent: Wednesday, February 03, 2010 5:47 PM
  Subject: Re : [RegCNET] cloud coverage


  Hi Gao

  As Filippo said, we calculate the total cloud cover using the random overlaping assumption considering all the levels. From the RAD files, you have for each level of the model its fc(i). The total cloud cover for n levels is given by:

  cl=1-[(1-fc(1))(1-fc(2))(1-fc(3).....(1-fc(n))]

  If you want, you can multiply cl by 100 to have it in percentage like in the CRU.

  Cheers


  ***************************************************
  Mouhamadou Bamba SYLLA
  Post-Doc Position, PWC/ESP
  International Centre for Theoretical Physics
  Strada Costiera 11, 34100 Trieste, Italy
  Office tel: 0039 040 2240 225
  Cell: 0039 34 71 94 06 55
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------------------------------------------------------------------------------
  De : "gaoxj at cma.gov.cn" <gaoxj at cma.gov.cn>
  À : regcnet at lists.ictp.it
  Envoyé le : Mer 3 Février 2010, 4 h 34 min 38 s
  Objet : [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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