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What's the difference: GEFS ensemble control run vs. GFS 1p00?


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Hi, my first post here! :)

Just beginning to get into NWP.  Wanted to understand the diff. between a GFS run (1 degree resolution) and the GEFS ensemble control run at the same time.

For example, if I compare 12z runs from earlier today (21 April 2017):

GEFS control analysis:
File: gec00.t12z.pgrb2anl
Message: "51:Temperature:K (instant):regular_ll:isobaricInhPa:level 100000 Pa:fcst time 0 hrs:from 201704211200:hi res cntl fcst"

GFS analysis:
File: gfs.t12z.pgrb2.1p00.anl
Message: "227:Temperature:K (instant):regular_ll:isobaricInhPa:level 100000 Pa:fcst time 0 hrs:from 201704211200"

I see that they vary by as much as 7 kelvin.

Why aren't they exactly the same?  I thought the ensemble control only adjusted for resolution, and was otherwise unperturbed.  Since I'm comparing identical resolutions, I'd have expected them to be identical.

Thank you.

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