Date: Thu, 3 Nov 1994 13:45:58 +0200
From: ilya@beach.weizmann.ac.il (Ilya Rivin)
Message-Id: <9411031145.AA19256@beach.weizmann.ac.il>
To: @weizmann.weizmann.ac.il:ccm-users@ncar.UCAR.EDU
Subject: air-sea heat fluxes in CCM1
Dear CCM1 users:
A week ago I posted the enclosed msg about large errors in CCM1
air-sea heat fluxes that prevented its successful coupling to a global
ocean model.
Several people kindly responded with a suggestion to use the flux
correction procedure. We have done that, of course, but
unfortunately, it seems that the errors in air-sea heat fluxes
produced by CCM1 are too large in some areas, so that even with flux
correction the coupled model drifts quite rapidly from the steady
state obtained in uncoupled runs of the atmospheric and ocean
submodels.
The only solution we see in order to eliminate this drift is to tune
the atmospheric CCM1 model to have more reasonable air-sea heat
fluxes. Has anybody done it before? We shall greatly appreciate any
comments or suggestions.
Thanks,
Ilya Rivin
Department of Environmental Sciences
Weizmann Institute of Science
Rehovot, 76100. ISRAEL.
EMAIL: cirivin@weizmann.weizmann.ac.il
FAX: 972-8-344124; TEL: 972-8-342543
The original msg I posted:
> We are trying to couple the CCM1 R15 model to a coarse (98x42x12 grid
> points) global ocean model. It seems that the distributed CCM1 code
> was never really tuned to have a reasonable heat flux over the ocean,
> and our own experience shows that errors in this flux are quite
> significant. When running the CCM1 model in a perpetual January case,
> the annually averaged heat flux (average of the air-sea heat flux that
> is fed into the ocean) seems much too strong, and gets to values of
> +/-200watts/meter**2 over mid-latitude mid-ocean areas, and up to
> -900watts/meter**2 cooling near the coast in the mid-latitude North
> Pacific. The heat flux components that seem especially far from the
> observed values. Atmospheric solution is otherwise reasonable.
>
> These unacceptable fluxes prevent a successful coupling to the ocean
> model, so we need to tune the air-sea fluxes in CCM1. Does anybody
> have an experience in tuning the CCM1 model to have more realistic
> heat flux in the ocean? Any details would be greatly appreciated.