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

Postertz0616PostedTue Feb 08, 2005 9:29 pm MST, http://bb.cgd.ucar.edu//viewtopic.php?p=333#333
Message: Dear all,
<br />
<br />   I have a question about parameterization of cloud in CAM3.
<br />
<br />   I read the description of CAM3 and know that 3 types of cloud
<br />  are diagnosed: low-level marine stratus (Cst), convective cloud (Ccir)
<br />  and layered cloud (Cc).
<br />   It is said that the marine stratus cloud is diagnosed based on Klein
<br />  and Hartmann(1993) using an empirical relationship between the marine stratocumulus cloud fraction (Cst) and the potential temperature difference between 700mb and surface. 
<br />
<br />   Then I use the 700mb and surface temperature output from CAM3 to 
<br />   calculate the diagnosed cloud based on Klein and Hartmann(1993) scheme, I find the diagnosed cloud cover is very close to the low cloud cover which is directly output from CAM3.
<br />
<br />   Now my question is that I am not sure if the low cloud cover is perdicted
<br />  exactly by Klein and Hartmann(1993) scheme? If it is not, how the low cloud cov!
 er is calculated? What's relationship between the low cloud cover output from CAM3 and the diagnosed cloud cover  based on Klein and Hartmann(1993) scheme?  Does other types of cloud, such as convective cloud and layered cloud  also have significant contributions to the low cloud cover?
<br />   
<br />   Any suggestions are highly appreciated.
<br />
<br />    tz0616

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