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<p>Hello <span>Sanjiv,</span></p>
<p><span><span>To my understanding, t</span>he </span><span><span>0.5
at the end of those two equations </span>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.<br>
</span></p>
<p><span>Hope that helps.</span></p>
<p><span>Best,</span></p>
<p><span>Quentin<br>
</span></p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Le 2/5/19 à 11:38 AM, Sanjiv
Ramachandran a écrit :<br>
</div>
<blockquote type="cite"
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<p style="margin-top:0;margin-bottom:0">Hi all,</p>
<p style="margin-top:0;margin-bottom:0"> 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).<br>
</p>
<p style="margin-top:0;margin-bottom:0"> <br>
</p>
<div> xalwu =
stefan*(0.5*Tair(i,j,bi,bj)+0.5*ttt+celsius2K)**4<br>
& *0.5 _d 0</div>
<br>
<p style="margin-top:0;margin-bottom:0"><span> xalwd =
stefan*(Tair(i,j,bi,bj)+celsius2K)**4*0.5 _d 0</span></p>
<p style="margin-top:0;margin-bottom:0"><span><br>
</span></p>
<p style="margin-top:0;margin-bottom:0"><span>In each of these
expressions, there is a 0.5 at the end of the expression. Is
that supposed to be the atmospheric emissivity?
<br>
</span></p>
<p style="margin-top:0;margin-bottom:0"><span><br>
</span></p>
<p style="margin-top:0;margin-bottom:0"><span>Thanks,</span></p>
<p style="margin-top:0;margin-bottom:0"><span><br>
</span></p>
<p style="margin-top:0;margin-bottom:0"><span>Sanjiv
Ramachandran</span></p>
<p style="margin-top:0;margin-bottom:0"><span>UMass Dartmouth</span><br>
</p>
</div>
<br>
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