Topic: Isobaric Mapping Function
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Atmosphere parameters on 2002.05.21_00:00 from NCEP
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Average and rms of the differences in meteorological parameters
from NCEP reanalysis and NCEP operational model in 2002.04
NCEP reanalysis model has a resolution 2.5x2.5 degrees, NCEP operational
model has a resolution 1x1 degrees. I used a grid 5x5 degrees in which both
models has common nodes. I did not try interpolate NCEP reanalysis model.
I've also excluded near polar regions, with latitude higher than -+ 80 degrees
in computing rms and average, since quality of models is supposed to be
significantly worse there. But there are no VLBI and GPS sites there.
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Animated movie of meteorological parameters evolution
from NCEP operational and NCEP reanalysis models in 2002.04
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Expression for IMF(h):
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Expression for IMF(w):
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Meteorological parameters above some stations.
Smoothing is done by boxcar filter with the 60 day width window.
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Difference in path delay at 10 degrees elevation angle IMF(h) -
NMF(h).
Smoothing is done by boxcar filter with the 60 day width window.
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Excess path delay at HARTRAO
Smoothing is performed by boxcar filter with the 60 day width window.
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Excess path delay at KOKEE
Smoothing is performed by boxcar filter with the 60 day width window.
IMFG_N (Inclination of the normal to the 200 mbar geopotential height
surface in north direction)
Units: radians. Argument: time in seconds after 2000.0. Plots end on
2004.01.01
TSUKUB32
WESTFORD
WETTZELL
IMFG_E (Inclination of the normal to the 200 mbar geopotential height
surface in east direction)
Units: radians. Argument: time in seconds after 2000.0. Plots end on
2004.01.01
TSUKUB32
WESTFORD
WETTZELL
Mapping function at 10 degrees elevation in North direction
Green line: IMFh,
Blue line: NMF2h,
Red line: NMFh
Without gradients:
TSUKUB32
WESTFORD
With gradients:
TSUKUB32
WESTFORD
Differences in positions of sources in solutions with IMFh+IMFg versus
solutions with NMF2
I made a clon of 2004b solution
imf07 where used IMFh and IMFg instead of NMFh and I constrainted
estimates of atmosphere tilt to zero instead to the apriori mean gtradents
model. For 615 soruces whose coordinates were estiamted as global parameters
I computed the differences in source coordinates of these solutions.
- Plot of Delta Delta versus declination.
- Plot of Delta Delta versus right
ascension.
- Plot of Delta Alpha*cos(delta) versus
right ascension.
Back to Leonid Petrov's discussion page.
Last update: 23-APR-2004 19:51:35