Topic: Isobaric Mapping Function


  1. Atmosphere parameters on 2002.05.21_00:00 from NCEP

  2. Geopotential height at 200 mbar reanalisys operational
    Surface pressure reanalisys operational
    Ratios of humidity integrals reanalisys operational

  3. Average and rms of the differences in meteorological parameters from NCEP reanalysis and NCEP operational model in 2002.04

  4. Geopotential height at 200 mbar average rms rms = 14.9 m
    Ratio of humidity integrals average rms rms = 0.27
    Surface pressure average rms rms = 137 Pa

    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.

  5. Animated movie of meteorological parameters evolution from NCEP operational and NCEP reanalysis models in 2002.04

  6. Geopotential height at 200 mbar NCEP operational model NCEP reanalysis model
    Ratio of humidity integrals NCEP operational model NCEP reanalysis model
    Surface pressure NCEP operational model NCEP reanalysis model

  7. Expression for IMF(h):


  8. Expression for IMF(w):


  9. Meteorological parameters above some stations.

    Smoothing is done by boxcar filter with the 60 day width window.

    NYALES20 WESTFORD FORTLEZA HARTRAO
    Geopotential height at 200 mbar Geopotential height at 200 mbar Geopotential height at 200 mbar Geopotential height at 200 mbar
    Geopotential height (smoothed) Geopotential height (smoothed) Geopotential height (smoothed) Geopotential height (smoothed)

    NYALES20 WESTFORD FORTLEZA HARTRAO
    East normal to gph surface East normal to gph surface East normal to gph surface East normal to gph surface
    East normal to gph surface (smoothed) East normal to gph surface (smoothed) East normal to gph surface (smoothed) East normal to gph surface (smoothed)

    NYALES20 WESTFORD FORTLEZA HARTRAO
    North normal to gph surface North normal to gph surface North normal to gph surface North normal to gph surface
    North normal to gph surface (smoothed) North normal to gph surface (smoothed) North normal to gph surface (smoothed) North normal to gph surface (smoothed)

    NYALES20 WESTFORD FORTLEZA HARTRAO
    Ratio of humidity integrals Ratio of humidiy intergrals Ratio of humidiy intergrals Ratio of humidiy intergrals
    Ratio of humidity integrals (smoothed) Ratio of humidiy intergrals (smoothed) Ratio of humidiy intergrals (smoothed) Ratio of humidiy intergrals (smoothed)

  10. 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.

    NYALES20 WESTFORD FORTLEZA HARTRAO
    IMF(h)-NMF(h) at 10 deg elevation IMF(h)-NMF(h) at 10 deg elevation IMF(h)-NMF(h) at 10 deg elevation IMF(h)-NMF(h) at 10 deg elevation
    IMF(h)-NMF(h) at 10 deg elevation (smoothed) IMF(h)-NMF(h) at 10 deg elevation (smoothed) IMF(h)-NMF(h) at 10 deg elevation (smoothed) IMF(h)-NMF(h) at 10 deg elevation (smoothed)

  11. Excess path delay at HARTRAO

    Smoothing is performed by boxcar filter with the 60 day width window.

  12. 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.

  1. Plot of Delta Delta versus declination.
  2. Plot of Delta Delta versus right ascension.
  3. Plot of Delta Alpha*cos(delta) versus right ascension.

Back to Leonid Petrov's discussion page.

Last update: 23-APR-2004 19:51:35