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<<  time step in CCM3, http://bb.cgd.ucar.edu//viewtopic.php?t=117 >>

PosterannaPostedThu Feb 10, 2005 9:21 am MST, http://bb.cgd.ucar.edu//viewtopic.php?p=336#336
Message: Dear CCM and CAM users,
<br />
<br />I am using the CCM3.6.6. within Paleo-CCSM simulations with continents different from today. With some
<br />continental geometries everything worked fine, but now I tried a new one, and then the atmosphere model
<br />crashes at some point with the error message:
<br />
<br />CUBYDR: Departure point out of bounds: jcen,icount,pgls= 39,  1726,  1728
<br />
<br />which seems to have to do with the length of the time step.
<br />I use the T31 resolution with a time step
<br />
<br />DTIME=1800
<br />
<br />as it should be for this resolution. The problem seems to be solved by just setting the time step to 1200
<br />seconds as is recomended for the T42 resolution. However, then physical parametrizations also change, and I
<br />don't know what I have to expect from that. Can I just change the time step without changing other
<br />parameters?
<br />
<br />It would be nice if I could get some help with that.
<br />
<br />Best regard!
 s,
<br />
<br />Anna
<br />
<br />--------------------------------
<br />Dr. Anna von der Heydt 
<br />Institute for Marine and Atmospheric Research
<br />Utrecht University
<br />The Netherlands

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<<  parameterization of cloud in CAM3, http://bb.cgd.ucar.edu//viewtopic.php?t=115 >>

PosterpjrPostedThu Feb 10, 2005 3:33 am MST, http://bb.cgd.ucar.edu//viewtopic.php?p=335#335
Message: Low cloud is not the same as stratocumulus for most parts of the world.
<br />
<br />The klein hartman relationship is defined only over ocean, and it is only
<br />non-zero in the presence of an inversion of the appropriate amplitude and
<br />depth. 
<br />
<br />This cloud amount is merged with two other kinds of clouds:
<br />1) relative humidity cloud
<br />2) convective cloud
<br />to make a variable that I will call CLOUD which represents the
<br />total amount of cloud in any cell.
<br />
<br />LOWCLD is an estimate of the amount of cloud that exists between the
<br />surface and a particular pressure level. As such it is supposed to 
<br />represent a quantity that is represents more than one layer. You should
<br />read the model description for the particulars.
<br />
<br />Phil

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