OPAC-2010 1 Processing of GRAS raw sampling data K. B. Lauritsen (DMI), M. E. Gorbunov (IAP), C. Marquardt (EUM), M. Bonnedal (RUAG), H.-H. Benzon (DMI),

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Presentation transcript:

OPAC Processing of GRAS raw sampling data K. B. Lauritsen (DMI), M. E. Gorbunov (IAP), C. Marquardt (EUM), M. Bonnedal (RUAG), H.-H. Benzon (DMI), G. B. Larsen (DMI), S. Syndergaard (DMI), M. B. Sørensen (DMI), and the GRAS RS performance study team ESA contract no.: 21995/08/NL/EL

OPAC GRAS RS data Reconstructed RS data from Sept 30 and Oct 2007 made available by EUMETSAT [Christian Marquardt et al]; Internal and external NBs also made available; internal NBs from netCDF file used in this study OCC code (similar to GRAS SAF ROPP_PP software) has been tuned together with Michael Gorbunov for being able to process GRAS RS data Data gaps: <0.8 sec filled with smooth model GRAS data do not penetrate as deep into the shadow zone as COSMIC data so low altitude biases are different --- Overall results are similar to OCC processing of COSMIC data

OPAC State of the art Fourier integral operator code (CT2) ensures high accuracy (GO used above 25 km) SO: optimal linear combination based on initialization to ECMWF or 2-parameter fitted MSIS climatology Quality control based on L2-signal and SO-solution: Q = Q L2 + Q SO Cutoff of u(t): all data used (i.e. no SLTA cutoff) Radio-holographic (RH) filtering: phase: no; CT-amplitude: yes - full RH filtering results in positive bias from suppression of large BAs and MP structures in wide-band signal tails [Sokolovskiy, 2009] OCC processing and options

OPAC GRAS occ #000155: OCC and WOP-simulation

OPAC GRAS occ # : OCC and Comparison

OPAC GRAS occ #004305: OCC and WOP-simulation

OPAC GRAS occ # : OCC and Comparison

OPAC GRAS RS data: Oct 2007 #occ

OPAC Compare to COSMIC April 2009: #occ

OPAC GRAS RS data: Oct 2007 smooth BA

OPAC GRAS RS data: Oct 2007 REF

OPAC Compare to COSMIC April 2009: REF

OPAC GRAS RS data: Oct 2007 Tdry

OPAC GRAS RS results Fractional BA deviation from ECMWF: - smaller than 0.3% from 5-30 km - lower troposphere negative bias: up to -6-8% at 2-3 km Fractional REF deviation from ECMWF: - smaller than 0.1% from 5-30 km - lower troposphere negative bias: up to -3% at 500 m

OPAC fin