As you say, roughness length is a specific value in Noah. If you want, you need to change it, or modify the code so roughness length can change by snow.<div><br></div><div>Esan</div><div><br><br><div class="gmail_quote">On Wed, Feb 1, 2012 at 11:34 AM, Liu, Peng <span dir="ltr"><<a href="mailto:pliu34@gatech.edu">pliu34@gatech.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear WRF users and developers,<br>
I am using Noah LSM of WRF3.1.1 and I have a specific question about the roughness length in Noah LSM.<br>
I read the code of module_sf_noahlsm.F and found out that for the roughness length, it is always equal to the background<br>
roughness length even when snow exists ( in function SNOWZ0); while for albedo and emissivity, they are modified based on background values when snow exists (in function ALCALC). So I wonder why roughness length is not modified when snow exists?<br>
I am looking forward to your responses.<br>
<br>
Thanks in advance.<br>
<br>
<br>
Best,<br>
<br>
Peng Liu<br>
<br>
<br>
<br>
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