[MITgcm-support] query ?

[Martin Losch]

Citing Trenberth+Caron (2001):
"There was a problem with the NCEP reanalyses that affected the quality 
of the reanonlyses over the SH (see Kistler etal. 2001). The problem 
arose from the assimilatioin of the Austrailan Surface Pressure Bogus 
Data for the SH (known as 'PAOBS', see 
http://wesly.wwb.noaa.gov/paobs/paobs.html) in which the observations 
were errorneously shifted by 180deg in longitude, affectin 1979-92 
(14yr). [...] The problem is likely to affect results over the southern 
oceans."

Based on this I was going to generate climatological means excluding 
this period and see, whether that helps. However, Trenberth and Caron 
use data from that period (see their fig5, for example) and the zonal 
integral does not seem to have any obvious problems). I'll tell you 
more later.

Martin

On Jun 3, 2005, at 3:36 PM, Dimitris Menemenlis wrote:

>> 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.
>
> Martin, there is an old story (rumor?) that NCEP reanalysis got some 
> key data set reversed by 180 deg in the Southern Ocean.  Could that 
> play a role?  Has anyone else heard or know more about this rumor?
>
> Dimitris
>
> -- 
> Dimitris Menemenlis <menemenlis at jpl.nasa.gov>
> Jet Propulsion Lab, California Institute of Technology
> MS 300-323, 4800 Oak Grove Dr, Pasadena CA 91109-8099
> tel: 818-354-1656;  fax: 818-393-6720
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