[MITgcm-support] query ?

[Martin Losch]

Hi,

for the input files ncep_qnet.bin and ncep_emp.bin, I have downloaded  
ncep reanalysis data from this site:

http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NCEP-NCAR/.CDAS-1/ 
.MONTHLY/.Diagnostic/.surface/

The data ranges from 1949 till today. Somewhere on this webpage you can  
include a filter, so that you get a monthly mean climatology from all  
years. This is what I did in 2002, so I got an average over the years  
1949 to 2002. I downloaded latent and sensible heat flux, long wave  
flux (lwflx), incomming solar radiation (solr), and added them up, and  
interpolated them to the global_ocean.90x40x15 grid to get  
ncep_qnet.bin. For ncep_emp.bin I used the difference of  
precipitation/1000 and evaporation (estimated from lwflx/2.5e6/1000).
Not to forget, I balanced heat flux and freshwater flux on the 90x40x15  
domain (depend on the land mask).

Just recently I noticed that the oceanic meridional heat transport  
implied by the ncep-heat flux (both the raw data and ncep_qnet.bin)  
does not agree very well with other estimates, especially in the  
Southern Ocean, so use the data with caution.
  global_ocean.90x40x15 is only meant as an example. We tried to tune  
the model so that the circulation resembles what we believe it should  
be and the heat flux problem is actually overwhelmed by the temperature  
restoring so that the actual heat flux in the ocean model is not so  
bad.

Martin
PS. I am currently having a closer look at the data to find out why the  
ncep heat flux is so different from what, e.g., Trenberth+Caron (2001,  
J.Clim.) find.

On Jun 3, 2005, at 9:28 AM, Amitabh Mitra wrote:

>   
>
>  Dear Sir,
>
>  I am running the global_ocean.90x40x15 experiment
>
>  with a resolution of 1x1.
>
>  Which formula has been used for creating the input files
>
>  ncep_qnet.bin and ncep_emp.bin ?
>
>  How can I connect the incoming shortwave, outgoing longwave,
>
>  sensible heat flux, latent heat flux, evaporation and
>
>  precipitation for creating these files ?
>
>  Thanking You,
>
>  With regards,
>
>  Amitabh Mitra
>
>
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