Ocean Modeling Discussion

ROMS/TOMS

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PostPosted: Tue Oct 09, 2012 4:56 am 
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Joined: Tue Aug 21, 2007 5:44 pm
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Location: Jeju National University
Dear users,

In the climatology run, either using Levitus T,S data or longterm averaged value from OGCM (SODA, ECCO) for the ocean initial state and COADS or the ECMWF mean data for the surface forcing, I found that the temperature sharply rises on first year in most cases. And also many literature shows that kind of temperature rise but no explanation. Is it because of the the heat flux between the ocean state and the surface forcing unbalanced? If not, could anyone explain the reason why this temperature is rising?


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PostPosted: Wed Oct 10, 2012 5:11 pm 
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Location: IMS/UAF, USA
What exactly are you doing? Are you applying the COADS heat fluxes or computing them through bulk fluxes? If the former, do you also have the dQ/dSST term? This term is very important and helps adjust the heat fluxes when the model SST differs from that used to compute the COADS heat flux.


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PostPosted: Thu Oct 11, 2012 1:30 am 
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Hi, Kate. Thanks for the reply.

My ROMS case is calculating the heat flux via the bulk formulae.

Attached figures are the yearly mean, surface and bottom level avergaged temperature variation for 41 years.

The model domain is North pacific basin (E98~W76, S20~N65).


Attachments:
File comment: bottom level averaged temp variation
mean_bottom_variation.png
mean_bottom_variation.png [ 7.9 KiB | Viewed 1461 times ]
File comment: surface level averaged temp variation
mean_surface_variation.png
mean_surface_variation.png [ 7.29 KiB | Viewed 1461 times ]
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PostPosted: Thu Oct 11, 2012 4:23 pm 
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I don't have recent experience with either product you mention, but we switched from NCEP to CORE2 for better heat fluxes over the North Pacific. Also make sure you have the albedo set the way you want, so that some heat flux reflects back to the atmosphere.

Our latest attempt was with MERRA over the Arctic where we grew too much ice. It's a fine line!


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