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<<  CAM3 failure to time interpolate aerosol data, http://bb.cgd.ucar.edu//viewtopic.php?t=27 >>

PosteraconleyPostedTue Oct 12, 2004 7:46 pm MDT, http://bb.cgd.ucar.edu//viewtopic.php?p=73#73
Message: Which version of the code are you running?  (ie., which tag?)
<br />
<br />You are correct that the "time" variable = "missing" is irrelevant.
<br />
<br />Which machine (architecture) are you running on?
<br />
<br />I would not be surprised if there is a bug in this part of the code on this particular case since we modified the code to use the same method as other sections of code.  Perhaps, starting on this boundary is problematic.  
<br />
<br />Andrew

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PosterboylePostedTue Oct 12, 2004 8:08 pm MDT, http://bb.cgd.ucar.edu//viewtopic.php?p=74#74
Message: I am running the intitial distribution of CAM3.0 ( 23 Jun) on the NERSC IBM SP (seaborg).
<br />
<br />The problem appears to be in line 1282 of the routine prescribed_aerosols.F90:
<br />if (caldayloc &gt; cdayp .and. .not. (mo_nxt == 1 .and. caldayloc &gt; cdaym)) then
<br />
<br />this is not correct if caldayloc is EXACTLY cdaym. In the normal course of affairs with the time step being 20 min (T42), the model days not exactly match the predetermined boundaries of the aerosol monthly data(cdaym, cdayp). In my case I was starting from 16Dec 12 Z exactly, so the error manifested itself. I think changing the above line to:
<br />    if (caldayloc &gt; cdayp .and. .not. (mo_nxt == 1 .and. caldayloc &gt;= cdaym)) then
<br />
<br />addresses the problem. 
<br />This will be a rare situation, but if you can verify the above fix it would probably be good to put it in the release. It cost me a bit of time.
<br />
<br />--Jim

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PosteraconleyPostedTue Oct 12, 2004 8:49 pm MDT, http://bb.cgd.ucar.edu//viewtopic.php?p=75#75
Message: Jim,
<br />
<br />I read the code the same way you do.  Thanks for discovering and even figuring out the problem.  I just talked with our programmers and it appears that it will probably be a couple of month till our next release.  In the meantime, please include the change that you suggested.
<br />
<br />Thanks,
<br />
<br />Andrew

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