Surface pressure Hofx in Swell test suites

[gmao-jjin3]

Compare JEDI hofX with GSI hofX when FV3-JEDI is not involved and is involved.

[gmao-jjin3]

GSI hofx is reproduced by JEDI/UFO in the swell-ufo_testing suite. FV3-JEDI is not involved.

[gmao-jjin3]

There are large differences between FV3-JEDI hofx and GSI hofx in the swell-hofx suite.

[gmao-jjin3]

There are large differences between "surface_pressure" geoval made by GSI and those made by FV3-JEDI. See figures at
#241 (comment)

[gmao-jjin3]

Here are Hofx differences between GSI and JEDI versus latitude. The JEDI hofx is the hofx0 produced by the swell-3dfget suite with only surface station data (sfc).

[gmao-jjin3]

Here are Jo differences between GSI and JEDI versus latitude. Results come from the swell-3dfget suite with only surface station data (sfc).

[rtodling]

I've done experiments w/ PS only observations in GSI and JEDI:

Here is the increment from GSI (top) and the difference between the JEDI corresponding increment and GSI's:

The counts of obs used are:
GSI: 105,638
JEDI: 105,520

The total Jo's and Jo/n are quite close.

it should be noted that the JEDI analysis above used SWELL's setting pointing to x0049 which has c90 backgrounds. I will redo the JEDI analysis w/ backgrounds at c180 which is consistent w/ the experiment I showed before I travel. I believe results will be even closer.

I think this corroborate my suspicion that the diff in PS increments we see in the exp I discussed are due to some other observing system; but not directly the PS observations.

[rtodling]

Just for the record, this is a similar test when using only scatterometer winds - this show the corresponding (multivariate) GSI ps increment (top) and the difference of the corresponding JEDI ps increment w/ GSI's:

This is pretty good agreement.

[rtodling]

I am coming to think the issue in the surface pressure increment is associated to how JEDI and GSI difference when assimilating clear-sky MW observations.

The following figure - again showing GSI increment on top, and difference of JEDI increment w/ that of GSI on the bottom - is the result of runs done w/ GSI (576x361) and JEDI (c180) when only AMSUA and ATMS observations are used.

yes, the differences in the increments (bottom) are nearly as large as the increment itself.

[rtodling]

I see also considerably large differences in the stratosphere - in the experiment above when only clear-sky MW observations are used. Here is the increment and the difference in increments for temperature at 1 mb.

But this has no correlation to what's happening near the surface.

[gmao-jjin3]

Hofx are different for ATMS_N20 in the stratosphere. Here are comparison for its channel 14 made by swell-3dfget with ATMS_N20 data only. Sensitivity of this channel peaks at ~2 hPa. Surface characteristics in BKG should have little impact on its Hofx.

[gmao-jjin3]

Large differences in hofx at moisture channels.