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Use of GPS Radio Occultation Data for Climate Monitoring

Use of GPS Radio Occultation Data for Climate Monitoring. Y.-H. Kuo, C. Rocken, and R. A. Anthes University Corporation for Atmospheric Research. GPS Occultation. Basic measurement principle: Deduce atmospheric properties based on precise measurement of phase delay and amplitude.

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Use of GPS Radio Occultation Data for Climate Monitoring

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  1. Use of GPS Radio Occultation Data for Climate Monitoring Y.-H. Kuo, C. Rocken, and R. A. Anthes University Corporation for Atmospheric Research

  2. GPS Occultation Basic measurement principle: Deduce atmospheric properties based on precise measurement of phase delay and amplitude.

  3. Radio occultation for Climate

  4. Radiosonde Stations and Manufacturers Vaisala/Australia IM-MK3/India Shang/China MEISEI/JapanMars/MRZ VIZ AIROthers From Junhong Wang

  5. Quantifying Regional Differences • Calculate the mean absolute difference in refractivity between CHAMP and Radiosondes (NCR) between 5 ~ 25 km. • Calculate the corresponding mean of the absolute value of the difference in refractivity between CHAMP and the ECMWF (NCE) • Perform calculation using radiosonde data from different regions of the world from June 2001 to March 2004. From D.Rossiter (UCAR Summer Student)

  6. Statistics of CHAMP - Radiosonde Comparison Fractional Refractivity Differences between 5 ~ 25 km

  7. Climate change to doubling CO2 • Perhaps the most accurate and stable global thermometer for estimating climate change • Most accurate where model-predicted temperature changes are large in upper troposphere and lower stratosphere Meehl et al. 2000, J. Climate.

  8. GPS - NCEP/NCAR reanalysis refractivity difference at 300 mb Northern Hemisphere

  9. GPS - ECMWF analysis refractivity difference at 300 mb Northern Hemisphere

  10. GPS - radiosonde refractivity difference at 300 mb Northern Hemisphere

  11. GPS - NCEP/NCAR reanalysis refractivity difference at 300 mb Southern Hemisphere

  12. GPS - ECMWF analysis refractivity difference at 300 mb Southern Hemisphere

  13. GPS - radiosonde refractivity difference at 300 mb Southern Hemisphere

  14. Temperature change as detected by GPS RO 300 mb

  15. Temperature change as detected by GPS RO 50 mb

  16. Temperature change as detected by GPS RO 10 mb

  17. COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate) • 6 Satellites launched in late 2005 • Three instruments: • GPS receiver, TIP, Tri-band beacon • Weather + Space Weather data • Global observations of: • Pressure, Temperature, Humidity • Refractivity • Ionospheric Electron Density • Ionospheric Scintillation • Demonstrate quasi-operational GPS limb sounding with global • coverage in near-real time • Climate Monitoring

  18. COSMIC Status

  19. GPS radio occultation missions

  20. EQUARS o: EQUARS o: COSMIC Distribution of GPS Occultation events in 24 hrs with EQUARS (2006, inclination angle<20o) and COSMIC (2005, 6 LEO satellites at 72o) COSMIC + Dense data rate in equatorial region Global coverage, but less data at low latitudes

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