[MITgcm-support] Excess cooling at the surface layers

Martin Losch Martin.Losch at awi.de
Thu Oct 27 10:18:21 EDT 2011

7degC in 15days corresponds to a surface heat flux of rho*cp*7K*10m/15days > 200W/m^2 for your 10m surface layer.  That's a lot. What about other parameters, such as ETAN?

I have no experience with Orlanski BCs. As a test you could close all boundaries and see if you still loose so much heat.


On Oct 27, 2011, at 1:51 PM, himansu pradhan wrote:

> Dear MITgcm users,
> I have run my MODEL,( configured for the Bay of Bengal ) for 15days which results in a "normal end".
> The input files are : a) 15 level Temperature and Salinity files b) Bathymetry file c) Wind stress files. I have used a Rectangular domain with z- cordinate. The Eastern, Northern and Southern bounderies of the domain are OPEN with Orlanski radiation boundary conditions.
> After a normal end, the results of
> 1) Velocity files have a reasonable magnitude and the circulation is satisfactory ( velocity_OUTPUT_15thday.jpg)...... this is OK.....
> 2) but, ??????  the sea surface temperature (OUTPUT_temp_15thday.jpg) after 15 day model integration drops almost by  4-7 degrees   from the initial surface temp (input file:- initial_temp.jpg)
> The drop of temperature is almost everywhere in the region . 
> Also, at the eastern and southern open boundaries the temperature contours seems to be squeezed at some regions as seen in the figure......... i am unable to figure out what is happening here.........???????
> OUTPUT_vertical_temp_profile.jpg : - shows depth-time graph of temperature (at one arbitrary point in my region)...... It is seen that the contours shoots up unreasonably ............??????
> Do kindly help with any suggestions, hints, clues.................
> My data files , input plot of temperature and salinity and output velocity, temperature files are attached in this mail.
> Thanking You in advance
> Himansu Pradhan
> Research Scholar, IIT Delhi
> India. <hi.tar.gz>_______________________________________________
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