[MITgcm-support] Atmospheric emissivity in Cheapaml

[quentin]

Hello Sanjiv,

To my understanding, the 0.5 at the end of those two equations refers to 
the up/down repartition of the atmospheric longwave radiations, i.e. 
half goes upward and half goes downward, while the atmospheric 
emissivity is set to 1 here.

Hope that helps.

Best,

Quentin



Le 2/5/19 à 11:38 AM, Sanjiv Ramachandran a écrit :
>
> 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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