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How are TS and SST computed in CAM?

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hzhang@...
How are TS and SST computed in CAM?

Hi,

In CAM, TS (surface temperature) is one of the default history fields, while SST (sea surface temperature) is one of the master fields that can be added to the history file (for E or B compset). I am wondering how they are computed in CAM.

Is "TS" computed as the fourth root of the upwelling longwave radiation at the surface (FLUS)? if correct, how is FLUS computed?

What about SST? Is it taken from the ocean model component (SOM or POP), or simply assigned with the TS values over ocean?

Can anyone point me to the source codes where they are computed?

Thanks a lot!

Honghai

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Honghai Zhang
Princeton University

hannay

TS is the actual surface temperature as defined by the top ice/land/ocean model level temperature output. 
SST is the actual surface temperature as defined by the ocean model level temperature output. 
These are passed to CAM from teh other components through the coupler. 

TS and SST should be the same if you have a grid box with ocean only.


hannay

TS is the actual surface temperature as defined by the top ice/land/ocean model level temperature output. 
SST is the actual surface temperature as defined by the ocean model level temperature output. 
These are passed to CAM from the other components through the coupler. 

TS and SST should be the same if you have a grid box with ocean only.


hzhang@...

Thank you. I appreciate it!

Since TS is named "radiative surface temperature", is it used to compute the surface upwelling longwave radiation via the Planck function? 

I noticed that CAM does not have an output field for the surface upwelling longwave radiation, but has FLNS (net longwave) and FLDS (downwelling longwave) at the surface. is it correct that the sum of FLNS and FLDS should be the total upwelling longwave radiation? 

 

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Honghai Zhang
Princeton University

hannay

 > is it correct that the sum of FLNS and FLDS should be the total upwelling longwave radiation? 

Yes, it will be teh upwelling  longwave at the surface

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