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Comparison of COSMIC radio occultation refractivity profiles with radiosonde measurements

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Abstract

In recent years, radio occultation (RO) technology making use of global positioning system (GPS) signals has been exploited to obtain profiles of atmospheric parameters in the neutral atmosphere. In this paper, the RO refractivity profiles obtained from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission are statistically compared with the observations of 38 radiosonde stations provided by the Australian Bureau of Meteorology during the period from 15 July 2006 through 15 July 2007. Different collocation criteria are compared at first, and COSMIC RO soundings that occur within 3 hours and 300 km of radiosonde measurements are used for the final statistical comparison. The overall results show that the agreements between the COSMIC refractivity profiles and the radiosonde soundings from the 38 stations are very good at 0–30 km altitude, with mean absolute relative refractivity deviations of less than 0.5%. Latitudinal comparisons indicate that there are negative refractivity deviations in the lower troposphere over the low latitude and middle latitude regions and large standard deviations exist in the lower troposphere of low latitude regions, which can reach up to ≈6%. The comparisons of COSMIC RO refractivity profiles and radiosonde observations for 3 polar stations in four different seasons indicate that the accuracy of GPS RO profiles is better in the Austral summer and autumn than in the Austral spring and winter during the year from September 2006 to August 2007.

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References

  • Anthes, R. A., and Coauthors, 2008: The COSMIC/FORMOSAT-3 Mission: Early Results. Bull. Amer. Meteor. Soc., 89(3), 313–333.

    Article  Google Scholar 

  • Cucurull, L., J. C. Derber, R. Treadon, and R. J. Purser, 2007: Assimilation of global positioning system radio occultation observations into NCEPs global data assimilation system. Mon. Wea. Rev., 35(9), 3174–3193.

    Article  Google Scholar 

  • Fjeldbo, G. F., V. R. Eshleman, and A. J. Kliore, 1971: The neutral atmosphere of venus as studied with the mariner V radio occultation experiments. Astronomical Journal, 76(2), 123–140.

    Article  Google Scholar 

  • Hajj, G.A., E. R. Kursinski, L. J. Romans, W. I. Bertiger, and S. S. Leroy, 2002: A technical description of atmospheric sounding by GPS occultation. Journal of Atmospheric and Solar-Terrestrial Physics, 64, 451–469.

    Article  Google Scholar 

  • Hajj, G. A., and Coauthors, 2004: CHAMP and SAC-C atmospheric occultation results and intercomparisons. J. Geophys. Res., 109(D6), doi: 10.1029/2003JD003909.

  • Healy, S. B., and J. N. Thepaut, 2006: Assimilation experiments with CHAMP GPS radio occultation measurements. Quart. J. Roy. Meteor. Soc., 132(615), 605–623.

    Article  Google Scholar 

  • Healy, S. B., A. M. Jupp, and C. Marquardt, 2005: Forecast impact experiment with GPS radio occultation measurements. Geophys. Res. Lett., 32, doi: 10.1029/2004GL020806.

  • Huang, C.-Y., Y.-H. Kuo, S.-H. Chen, and F. Vandenberghe, 2005: Improvements in Typhoon Forecasts with assimilated GPS occultation refractivity. Wea. Forecasting, 20(6), 931–953.

    Article  Google Scholar 

  • Kuo, Y.-H., T.-K. Wee, S. Sokolovskiy, C. Rocken, W. Schreiner, D. Hunt, and R. A. Anthes, 2004: Inversion and error estimation of GPS radio occultation data. J. Meteor. Soc. Japan, 82(1B), 507–531.

    Article  Google Scholar 

  • Kuo, Y.-H., W. S. Schreiner, J. Wang, D. L. Rossiter, and Y. Zhang, 2005: Comparison of GPS radio occultation soundings with radiosondes. Geophys. Res. Lett., 32, doi: 10.1029/2004GL021443.

  • Nedoluha, G. E., J. Alfred, C. M. Benson, K. W. Hoppel, J. Wickert, and G. Koenig-Langlo, 2007: A comparison of radiosonde and GPS radio occultation measurements with meteorological temperature analyses in the Antarctic vortex, 1998–2004. J. Geophys. Res., 112, D16304, doi: 10.1029/2007JD008928.

    Article  Google Scholar 

  • Palmer, P. I., J. J. Barnett, J. R. Eyre, and S. B. Healy, 2000: A non-linear optimal estimation inverse method for radio occultation measurements of temperature, humidity and surface pressure. J. Geophys. Res., 105, 17513–17526.

    Article  Google Scholar 

  • Rocken, C., and Coauthors, 1997: Analysis and validation of GPS/MET data in the neutral atmosphere. J. Geophys. Res., 102(D25), 29849–29866.

    Article  Google Scholar 

  • Schmidt, T., S. Heise, J. Wickert, G. Beyerle, and C. Reigber, 2005: GPS radio occultation with CHAMP and SAC-C: Global monitoring of thermal tropopause parameters. Atmospheric Chemistry and Physics, 5, 1473–1488.

    Article  Google Scholar 

  • Schreiner, W., C. Rocken, S. Sokolovskiy, S. Syndergaard, and D. Hunt, 2007: Estimates of the precision of GPS occultations from the COSMIC/FORMOSAT-3 mission. Geophys. Res. Lett., 34, L04808, doi: 10.1029/2006GL027557.

    Article  Google Scholar 

  • von Engeln, A., G. Nedoluha, G. Kirchengast, and S. Bhler, 2003: One-dimensional variational (1-D Var) retrieval of temperature, water vapor, and a reference pressure from radio occultation measurements: A sensitivity analysis. J. Geophys. Res., 108(D11), 4337, doi: 10.1029/2002JD002908.

    Article  Google Scholar 

  • Wang, K., and S. Lin, 2007: First continuous GPS soundings of temperature structure over Antarctic winter from FORMOSAT-3/COSMIC constellation. Geophys. Res. Lett., 34(12), doi: 10.1029/2007GL030159.

  • Wang, Y., and B. Wang, 2003: The variational experiment of GPS bending angle. Adv. Atmos. Sci., 20(3), 479–486.

    Article  Google Scholar 

  • Ware, R., and Coauthors, 1996: GPS Sounding of the atmosphere for low earth orbit: Preliminary results. Bull. Amer. Meteor. Soc., 77, 19–40.

    Article  Google Scholar 

  • Wickert, J., 2004: Comparison of vertical refractivity and temperature profiles from CHAMP with radiosonde measurements. Scientific Report 04-09, Danish Meteorological Institute, 35pp.

  • Wickert, J., T. Schmidt, G. Beyerle, R. Konig, and C. Reigber, 2004: The radio occultation experiment aboard CHAMP operational data analysis and validation of vertical atmospheric profiles. J. Meteor. Soc. Japan, 82(1B), 381–395.

    Article  Google Scholar 

  • Yunck, T. P., G. F. Lindal and C. H. Liu, 1988: The Role of GPS in Precise Earth Observation. Proc. IEEE Position Location and Navigation Symposium (PLANS88), Nov. 29–Dec. 2, 1988, Orlando, FL, 251–258.

  • Zhang, X., Y. Liu, B. Wang, and Z. Ji, 2004: Parallel computing of a variational data assimilation model for GPS/MET observation using the raytracing method. Adv. Atmos. Sci., 21(2), 220–226.

    Article  Google Scholar 

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Authors and Affiliations

  1. School of Geodesy and Geomatics, Wuhan University, Wuhan, 430079, China

    Xiaohua Xu  (徐晓华) & Jia Luo  (罗 佳)

  2. School of Mathematical and Geospatial Sciences, RMIT University, Melbourne, Victoria, 3001, Australia

    Xiaohua Xu  (徐晓华)

  3. GNSS Research Center, Wuhan University, Wuhan, 430079, China

    Chuang Shi  (施 闯)

Authors
  1. Xiaohua Xu  (徐晓华)
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  2. Jia Luo  (罗 佳)
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  3. Chuang Shi  (施 闯)
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Correspondence to Xiaohua Xu  (徐晓华).

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Xu, X., Luo, J. & Shi, C. Comparison of COSMIC radio occultation refractivity profiles with radiosonde measurements. Adv. Atmos. Sci. 26, 1137–1145 (2009). https://doi.org/10.1007/s00376-009-8066-y

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  • DOI: https://doi.org/10.1007/s00376-009-8066-y

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