[RegCNET] (no subject)

[William J. Gutowski]

Dear Yan and Jeremy:
	It might be worth knowing that several models have trouble 
simulating Amazonia.  I have seen some results comparing latent heat 
flux from RegCM3 and some other RCMs with observations from the 
Pantanal GEWEX reference site, and they are all low in their daily 
max by at least a factor of 2.  RegCM3 is lower still, but not the 
lowest.    It would be interesting to see what AOGCMs do.  There 
appear to be some generic modeling issues here.

Bill

At 2:27 PM +0200 2005.10.03, Pal Jeremy wrote:
>Dear Yan,
>
>Is it possible that your precipitation is too low?  In other words, 
>your soils might be drying out and causing an increase in sensible 
>heat because there is too little precipitation (i.e. infiltration). 
>What convection scheme/closure are you using?  We have found that 
>with the Grell/FC scheme, precipitation in South America is way to 
>low, but with the MIT/Emanuel scheme (icup=4) the dry bias is 
>removed.
>
>Jeremy
>
>Yan Zhang wrote:
>>Dear All,
>>      I used the newest version to simulate Amazonnia dry season. I 
>>found the value of SH (LH) are too high (low) comparing with 
>>Observational data.
>>Usually, how do you deal with such problem? I did some tries, like 
>>increase initial soil moisture, increase soil depth, but after two 
>>months simulations, the SH data go up and LH go down even when 
>>rainfall increased.
>>I am looking forward to your help.
>>
>>Thanks in advance!
>>
>>
>
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  William J. Gutowski                                            
  3021 Agronomy                                                  
  Dept. of Geological and                                        
     Atmospheric Sciences 	gutowski at iastate.edu   
  Dept. of Agronomy		Tel: +1-515-294-5632   
  Iowa State University     	Fax: +1-515-294-2619   
  Ames, Iowa  50011-1010                                         
  http://www.ge-at.iastate.edu                                  
  http://rcmlab.agron.iastate.edu/                             
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