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GPS RADIO OCCULTATIONS WITH CHAMP: TEMPERATURE MEASUREMENTS IN THE UTLS REGION

GPS RADIO OCCULTATIONS WITH CHAMP: TEMPERATURE MEASUREMENTS IN THE UTLS REGION T. Schmidt, J. Wickert , G. Beyerle, and C. Reigber GeoForschungsZentrum (GFZ) Potsdam Department 1: Geodesy & Remote Sensing. Overview. Introduction Radio occultation measuring principle

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GPS RADIO OCCULTATIONS WITH CHAMP: TEMPERATURE MEASUREMENTS IN THE UTLS REGION

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  1. GPS RADIO OCCULTATIONS WITH CHAMP: TEMPERATURE MEASUREMENTS IN THE UTLS REGION T. Schmidt, J. Wickert, G. Beyerle, and C. Reigber GeoForschungsZentrum (GFZ) Potsdam Department 1: Geodesy & Remote Sensing

  2. Overview • Introduction • Radio occultation measuring principle • Data base and quality • Applications • Summary

  3. CHAMP Launch Launched on July 15, 2000 at Plesetsk (Russia) Mission duration: 6-7 years Orbit: eccentricity=0.004 inclination=87.2° initial altitude=454 km Determination of Earth‘s gravity, magnetic field and global sounding of Earth‘s atmosphere

  4. Radio Occultation Geometry

  5. Occultation Data Analysis Double Differencing Precise Orbit Data Carrier Phases & SNR Atmospheric Excess Path Derivation of Bending Angle Ionospheric Corrections Temperature from Meteorological Analyses Bending Angle Profile Profiling Wet Air Profiling Dry Air Abel Inversion Water Vapour Dry Temperature Refractivity Profile

  6. Radio Occultation Technique: Characteristics Global coverage High vertical resolution Earth All-weather viewing Long-term stability

  7. Global distribution Feb - Dec 2001 (11 months) ~35.000 occultations

  8. CHAMP vs. ECMWF -1.0 0.5 0.0 0.5 0.5 0.0 0.0 -0.5

  9. CHAMP vs. Radiosondes May 2001 – July 2003 Dd < 300 km Dt < 3 h Radiosonde data from FU Berlin

  10. CHAMP tropopause parameters Lapse-rate tropopause altitude 2001 2002 2003 Lapse-rate tropopause temperature 2001 2002 2003

  11. CHAMP tropopause parameters (10S-10N) 0.4 hPa -4.9 hPa -1.3 hPa 0.5 K -4.2 K -1.2 K

  12. CHAMP 2001-2003

  13. Temperature anomaly over equator

  14. Summary • Since February 2001 CHAMP radio occultation experiment activated on more than 830 days (more than 116.000 profiles of refractivity, temperature available) • CHAMP provide high vertical resolution temperature profile data • Good agreement with ECMWF and radiosondes in upper troposphere and lower stratosphere (300 – 30 hPa): • Temperature bias <1 K • Temperature RMS deviation 1–2 K • CHAMP in excellent condition, mission expected to last until 2007

  15. GPS radio occultation missions GRACE # Sats CHAMP 1 2 GFZ Potsdam TerraSAR-X 1 SAC-C 1 GPS / MET COSMIC 6 pioneering METOP 3 3 NPOESS (3-6) ACE+/SWARM 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

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