Advertisement

Using Atmospheric Uncertainties for GRACE De-aliasing: First Results

  • L. ZennerEmail author
  • T. Gruber
  • G. Beutler
  • A. Jäggi
  • F. Flechtner
  • T. Schmidt
  • J. Wickert
  • E. Fagiolini
  • G. Schwarz
  • T. Trautmann
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 136)

Abstract

In standard gravity field processing, short-term mass variations in the atmosphere and the ocean are eliminated in the so-called de-aliasing step. Up to now the background models used for de-aliasing have been assumed to be error-free. As the accuracy assessed prior to launch could not yet be achieved in the analysis of real GRACE data, the de-aliasing process and related geophysical model uncertainties have to be considered as potential error sources in GRACE gravity field determination. The goal of this study is to identify the impact of atmospheric uncertainties on the de-aliasing products and on the resulting GRACE gravity field models. The paper summarizes the standard GRACE de-aliasing process and studies the effect of uncertainties in the atmospheric (temperature, surface pressure, specific humidity, geopotential) input parameters on the gravity field potential coefficients. Finally, the impact of alternative de-aliasing products (with and without atmospheric model errors) on a GRACE gravity field solution is investigated on the level of K-band range-rate residuals. The results indicate that atmospheric model uncertainties are small in terms of the associated spherical harmonic coefficients. The effect in terms of K-band observation residuals is negligible compared to other modeling errors.

Keywords

Gravity Field Orbit Determination Geoid Height Gravity Field Model Potential Coefficient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This study was conducted as part of the IDEAL-GRACE project with the support of the German Research Foundation (Deutsche Forschungsgemeinschaft) and within the SPP1257 priority program “Mass transport and Mass Distribution in the System Earth”. The International Graduate School for Science and Engineering of the Technische Universität München also supported this work.

References

  1. Dach R, Hugentobler U, Fridez P, Meindl M (eds) (2007) Bernese GPS software version 5.0. Astronomical Institute, University of Bern, BernGoogle Scholar
  2. Dobslaw H, Thomas M (2007) Simulation and observation of global ocean mass anomalies. J Geophys Res 112:C05040. doi: 10.1029/2006JC004035 CrossRefGoogle Scholar
  3. ECMWF (2009) MARS user guide. Technical Notes, p 5. http://www.ecmwf.int/publications/manuals/mars/guide/MarsUserGuide.pdf. Accessed date 17 August 2011
  4. Flechtner F (2007) AOD1B product description document. GRACE project documentation, JPL 327–750, Rev. 1.0. JPL, Pasadena, CA. 17 August 2011Google Scholar
  5. Jäggi A, Beutler G, Meyer U, Prange L, Dach R, Mervart L (2011) AIUB-GRACE02S: status of GRACE gravity field recovery using the celestial mechanics approach. In: Kenyon S et al (eds) Geodesy for planet earth. Springer, HeidelbergGoogle Scholar
  6. Kim J (2000) Simulation study of a low-low satellite-to-satellite tracking mission. Technical report, University of Texas at Austin, Austin, TXGoogle Scholar
  7. Ponte RM, Dorandeau J (2003) Uncertainties in ECMWF surface pressure fields over the ocean in relation to sea level analysis and modeling. J Atm Ocean Technol 20(2):301. doi: 10.1175/1520-0426(2003)020 CrossRefGoogle Scholar
  8. Salstein DA, Ponte RM, Cady-Pereira K (2008) Uncertainties in atmospheric surface pressure fields from global analyses. J Geophys Res 113:D14107. doi: 10.1029/2007JD009531 CrossRefGoogle Scholar
  9. Schmidt T, Wickert J, Heise J, Flechtner F, Fagiolini E, Schwarz G, Zenner L, Gruber T (2008) Comparison of ECMWF analyses with GPS radio occultations from CHAMP. Ann Geophys 26:3225–3234. http://www.ann-geophys.net/26/3225/2008/. Accessed date 17 August 2011CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • L. Zenner
    • 1
    Email author
  • T. Gruber
    • 1
  • G. Beutler
    • 2
  • A. Jäggi
    • 2
  • F. Flechtner
    • 3
  • T. Schmidt
    • 3
  • J. Wickert
    • 3
  • E. Fagiolini
    • 4
  • G. Schwarz
    • 4
  • T. Trautmann
    • 4
  1. 1.Institut für Astronomische und Physikalische GeodäsieTechnische Universität MünchenMünchenGermany
  2. 2.Astronomisches InstitutUniversität BernBernSwitzerland
  3. 3.GeoForschungsZentrumPotsdamGermany
  4. 4.Deutsches Zentrum für Luft- und RaumfahrtWeßlingGermany

Personalised recommendations