Assimilation experiments with CHAMP GPS radio occultation measurements

Quarterly Journal of the Royal Meteorological Society

Volumn 132, Issue 615, 2006, Pages 605-623

  Healy, Sean B ^a   Thepaut J N ^a  

^a EUROPEAN CENTRE FOR MEDIUM RANGE WEATHER FORECASTS   (United Kingdom)

Author keywords

4D Var; Degrees of freedom for signal

Indexed keywords

GLOBAL POSITIONING SYSTEM; RADIO INTERFERENCE; RADIOSONDES; SENSITIVITY ANALYSIS; STATISTICAL METHODS; TROPOSPHERE; UPPER ATMOSPHERE;

DEGREES OF FREEDOM FOR SIGNAL (DFS); RADIO OCCULTATION; SOUTHERN HEMISPHERE;

METEOROLOGY;

DATA ASSIMILATION; GPS; SIGNAL PROCESSING;

EID: 33645509477     PISSN: 00359009     EISSN: None     Source Type: Journal    
DOI: 10.1256/qj.04.182     Document Type: Article

References (39)

1. Abramowitz, M. and Stegun, I. (Eds.) 1964 Mathematical functions with formulas, graphs, and mathematical tables. Dover Publications, New York, USA
2. Andersson, E. and Järvinen, H. 1999 Variational quality control. Q. J. R. Meteorol. Soc., 125, 697-722
3. Anthes, R., Rocken, C. and Kou, Y. 2000 Applications of COSMIC to meteorology and climatology. Terr., Atmos. Ocean. Sci., 11, 115-156
4. Ao, C., Meehan, T., Hajj, G., Manucci, A. and Beyerle, G. 2003 Lower troposphere refractivity bias in GPS occultation retrievals. J. Geophys. Res., 108, doi: 10.1029/2002JD003216
5. Bean, B. and Dutton, E. 1968 Radio Meteorology. Dover Publications, New York, USA
6. Cardinali, C., Pezzulli, S. and Andersson, E. 2004 'Influence matrix diagnostic of a data assimilation system'. Technical memorandum 450, ECMWF, Reading, UK
7. Collard, A. and Healy, S. 2003 The combined impact of future space-based atmospheric sounding instruments on numerical weather prediction analysis fields: A simulation study. Q. J. R. Meteorol. Soc., 129, 2741-2760
8. Courtier, P., Thépaut, J.-N. and Hollingsworth, A. 1994 A strategy for operational implementation of 4D-Var, using an incremental approach. Q. J. R. Meteorol. Soc., 120, 1367-1388
9. Eyre, J. 1994 'Assimilation of radio occultation measurements into a numerical weather prediction system'. Technical memorandum 199, ECMWF, Reading, UK
10. Fisher, M. 2003 'Estimation of entropy reduction and degrees of freedom of signal for large variational analysis systems'. Technical memorandum 397, ECMWF, Reading, UK
11. Healy, S. 2001 Radio occultation bending angle and impact parameter errors caused by horizontal refractive index gradients in the troposphere: A simulation study. J. Geophys. Res., 106, 11875-11889
12. Healy, S. and Eyre, J. 2000 Retrieving temperature, water vapor and surface pressure information from refractive-index profiles derived by radio occultation: A simulation study. Q. J. R. Meteorol. Soc., 126, 1661-1683
13. Healy, S., Jupp, A. and Marquardt, C. 2005 Forecast impact experiment with GPS radio occultation measurements. Geophys. Res. Lett., 32, L03804, doi: 10.1029/2004GLO20806
14. Hocke, K. 1997 Inversion of GPS meteorology data. Ann. Geophys., 15, 443-450
15. Järvinen, H. and Undén, P. 1997 'Observation screening and background quality control in the ECMWF 3D-Var data assimilation system'. Technical memorandum 236, ECMWF, Reading, UK
16. Jensen, A., Lohmann, M., Bezon, H.-H. and Nielsen. A. 2003 Full Spectrum Inversion of radio occultation signals. Radio Sci., 38, 1040, doi: 10.1029/2002RS002763
17. Klinker, E., Rabier, F., Kelly, G. and Mahfouf, J.-J. 2000 The ECMWF operational implementation of four dimensional variational assimilation. Part III: Experimental results and diagnostics with operational configuration. Q. J. R. Meteorol. Soc., 126, 1191-1218
18. Kuo, Y.-H., Sokolovskiy, S., Anthes, R. and Vandenberghe, F. 2000 Assimilation of GPS radio occultation data for numerical weather prediction. Terr., Atmos. Ocean. Sci., 11, 157-186
19. Kuo, Y.-H., Wee, T.-K., Sokolovskiy, S., Rocken, C., Schreiner, W., Hunt, D. and Anthes, R. 2004 Inversion and error estimation of GPS radio occultation data. J. Meteorol. Soc. Japan, 82, 507-531
20. Kursinski, E., Hajj, G., Bertiger, W., Leroy, S., Meehan, T., Romans, L., Schofield, J., McCleese, D., Melbourne, W., Thornton, C., Yunck, T., Eyre, J. and Nagatani, R. 1996 Initial results of radio occultation observations of each's atmosphere using the Global Positioning System. Science, 271, 1107-1110
21. Kursinski, E., Hajj, G., Schofield, J., Linfield, R. and Hardy, K. 1997 Observing earth's atmosphere with radio accultation measurements using the Global Positioning System. J. Geophys. Res., 102, 23429-23465
22. List, R. (Ed.) 1984 Smithsonian meteorological tables. Smithsonian Institution Press, Washington DC, USA
23. Liu, H., Zou, X., Shao, H., Anthes, R., Chang, J., Tseng, J.-H. and Wang, B. 2001 Impact of 837 GPS/MET bending angle profiles on assimilation and forecasts for the period June 20-30, 1995. J. Geophys. Res., 106, 31771-31786
24. Loiselet, M., Stricker, N., Menard, Y. and Luntama, J.-P. 2000 'Metop's GPS-based atmospheric sounder'. Bulletin 102, ESA, Darmstadt, Germany
25. Marquardt, C., Healy, S., Luntama, J.-P. and McKernan, E. 2005 'GRAS level 1b product validation with 1D-Var retrieval'. Programme Development Department, Technical memorandum 12, EUMETSAT, Darmstadt, Germany
26. McNally, A. P., Watts, P. D., Smith, J. A., Engelen, R., Kelly, G.A., Thépaut, J.-N. and Matricardi, M. 2006 The assimilation of AIRS radiance data at ECMWF. Q. J. R. Meteorol. Soc., 132, in press
27. Melbourne, W., Davis, E., Duncan, C., Hajj, G., Hardy, K., Kursinski, E., Meehan, T. and Young, L. 1994 'The application of spaceborne GPS to atmospheric limb sounding and global change monitoring'. Publication 94-18, Jet Propulsion Laboratory, Pasadena, Calif., USA
28. Poli, P. and Joiner, J. 2003 'Assimilation experiments of one-dimensional variational analyses with GPS/MET refractivity'. Pp. 515-520 in First CHAMP mission results for gravity, magnetic and atmospheric studies. (Eds.) C. Reigber, H. Luhr and P. Schwintzer
29. Poli, P. and Joiner, J. 2004 Effects of horizontal gradients on GPS radio occultation observation operators. I: Ray tracing. Q. J. R. Meteorol. Soc., 130, 2787-2805
30. Poli, P., Joiner, J. and Kursinski, E. 2002 ID-Var analysis of temperature and humidity using GPS radio occultation refractivity data. J. Geophys. Res., 107, 4448, doi: 10.1029/2001JD000935
31. Rabier, F., Järvinen, H., Klinker, E., Mahfouf, J.-J. and Simmons, A. 2000 The ECMWF operational implementation of four dimensional variational assimilation. I: Experimental results with simplified physics. Q. J. R. Meteorol. Soc., 126, 1143-1170
32. Rocken, C., Anthes, R., Exner, M., Hunt, D., Sokolovsky, S., Ware, R., Gorbunov, M., Herman, B., Kuo, Y.-H. and Zou, X. 1997 Analysis and validation of GPS/MET data in the neutral atmosphere. J. Geophys. Res., 102, 29849-29866
33. Rodgers, C. D. 2000 Inverse methods for atmospheric sounding: Theory and practice. World Scientific Publishing, Singapore
34. Simmons, A. and Burridge, D. 1981 An energy and angular momentum conserving vertical finite difference scheme and hybrid coordinate. Mon. Weather Rev., 109, 758-766
35. Simmons, A. and Hollingsworth, A. 2002 Some aspects of the improvement in skill of numerical weather prediction. Q. J. R. Meteorol. Soc., 128, 647-677
36. Tsuda, T., Nishida, M., Rocken, C. and Ware, R. 2000 A global morphology of gravity wave activity in the stratosphere revealed by the GPS occultation data (GPS/MET). J. Geophys. Res., 105, 7257-7273
37. Wickert, J., Reigber, C., Beyerle, G., König, R., Marquardt, C., Schmidt, T., Grunwaldt, L., Galas, R., Meehan, T., Melbourne, W. and Hocke, K. 2001 Atmosphere sounding by GPS radio occultation: First results from Champs. Geophys. Res. Lett., 28, 3263-3266.
38. Zou, X., Vandenberghe, F., Wang, B., Gorbunov, M., Kuo, Y.-H., Sokolovsky, S., Chang, J., Sela, J. and Anthes, R. 1999 A ray-tracing operator and its adjoint for the use of GPS/MET refraction angle measurements. J. Geophys. Res., 104, 22301-22318
39. Zou, X., Liu, H., Anthes, R., Shao, H., Chang, J. and Zhu, Y.-J. 2004 Impact of CHAMP radio occultation observations on global analyses and forecasts in the absence of AMSU radiance data. J. Meteorol. Soc. Japan, 82, 533-549