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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"
cite="mid:BN6PR2001MB17327FECDBAEBD9A559B2401CC6E0@BN6PR2001MB1732.namprd20.prod.outlook.com">
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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>
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