cuase of the temperature rise

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susonic
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cuase of the temperature rise

#1 Post by susonic » Tue Oct 09, 2012 4:56 am

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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kate
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Re: cuase of the temperature rise

#2 Post by kate » Wed Oct 10, 2012 5:11 pm

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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susonic
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Re: cuase of the temperature rise

#3 Post by susonic » Thu Oct 11, 2012 1:30 am

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
bottom level averaged temp variation
bottom level averaged temp variation
mean_bottom_variation.png (7.9 KiB) Viewed 2442 times
surface level averaged temp variation
surface level averaged temp variation
mean_surface_variation.png (7.29 KiB) Viewed 2442 times

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kate
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Re: cuase of the temperature rise

#4 Post by kate » Thu Oct 11, 2012 4:23 pm

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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