[MITgcm-support] Atmospheric emissivity in Cheapaml

[Sanjiv Ramachandran]

Hi all,

           I have a question regarding the value of the atmospheric emissivity used by cheapaml. Here is a snippet of code from the file cheapaml.F computing the upward longwave radiation (xalwu) emitted through the top of the ABL and the downward radiation (xalwd) through the "bottom" (= reference height of atmospheric variables in cheapaml).



           xalwu = stefan*(0.5*Tair(i,j,bi,bj)+0.5*ttt+celsius2K)**4
     &                   *0.5 _d 0


          xalwd = stefan*(Tair(i,j,bi,bj)+celsius2K)**4*0.5 _d 0


In each of these expressions, there is a 0.5 at the end of the expression. Is that supposed to be the atmospheric emissivity?


Thanks,


Sanjiv Ramachandran

UMass Dartmouth
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