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<<  parameterization of cloud in CAM3, http://bb.cgd.ucar.edu//viewtopic.php?t=115 >>

PosterpjrPostedSun Feb 13, 2005 6:12 am MST, http://bb.cgd.ucar.edu//viewtopic.php?p=347#347
Message: Dear phil,
<br />   
<br />   Thanks your valuable suggestions. I learn a lot from you.
<br />  I still have 3 small questions.
<br />
<br />1) I am not sure if in each model vertical layer, the  field called CLOUD 
<br />  is equal to max (Cc,Ccir,Cst).  
<br />  Here Cc, Ccir, Cst is the relative humidity cloud, convective cloud and
<br />  stratus cloud.
<br />
<br />
<br />This should be documented in the manual. Otherwise you will need
<br />to look at the code itself. My memory is that your expression above is correct.
<br />
<br />2) Why the variable called CLDST (which contains the clouds predicted by the K/L relationship) has 26 layers in the vertical? Becuase according to
<br />the formulation of Klein and Hartmann (1993),
<br />  that is, Cst=min{1.,max
<br />
<br />The expression tells you the cloud fraction, but not the layer that the
<br />cloud resides in. We choose the cloud to reside in the two layers below the inversion.
<br />
<br />
<br />
<br />!
 3) I look at the output from CAM3  /JMCCAA/csm/eul64x128_d50amip/
<br />but I can not find the variable CLDST (which contains the clouds predicted by the K/L relationship) and CNVCLD.
<br />  I don't where to get these variables, or I have to run the model by myself to turn on the output for these variables.
<br />
<br />
<br /> 
<br />You will need to run the model by yourself to turn these variable on.
<br />
<br />Good luck
<br />
<br />Phil

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