radiation / sst issue

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jalves · #1 Unread post by **jalves** » Mon May 07, 2007 2:56 pm

I have used the bulk_fluxes option, to force the model with shortwave (swrad) and longwave downwelling radiation (lwrad_down), among other variables, but I am getting SST somewhat higher (1 to 2 ºC) than the local observations or satellite temperatures.
The input radiations seem to me to have the expected values and as the currents also have normal values to the region I am studying, I think this is a radiation issue. Has someone had a similar problem and can give me any hint to lower the sea surface temperature?

Note: I am using roms-2.2

Thanks in advance,
jose

kate · #2 Unread post by **kate** » Mon May 07, 2007 5:06 pm

We've had this happen when using NCEP. I believe the collective wisdom is that it is underestimating the amount of low clouds, therefore overestimating the radiation hitting the water.

jacopo · #3 Unread post by **jacopo** » Tue May 08, 2007 2:14 pm

some simple checks:

Remember you have to feed ROMS with 'net' shortwave, i.e., albedo effect already taken into account.

Remember to define DIURNAL_SRFLUX if you are using daily values of shortwave radiation

Remember to adjoust the values (in mod_scalars.F) of

Code: Select all

        real(r8) :: blk_ZQ =  10.0_r8          ! (m)
        real(r8) :: blk_ZT =  10.0_r8          ! (m)
        real(r8) :: blk_ZW = 10.0_r8          ! (m)

according to your meteo input data.

well ... just in case you didn't

Jacopo