This study would not have been possible without Joel Dorandeu and Philippe Sicard, who wrote special computer codes to extract and process the TOPEX, ERS-1, and ERS-2 data. The author would also like to thank everyone at CERSAT, the French Processing and Archiving Facility, for their special efforts to make all ERS-1 Microwave Brightness Temperatures (MBT) data available. Sid-Ahmed Boukabara and Laurence Eymard from CETP kindly provided all the ERS-2 data, as well as results from the most recently updated ERS-1 calibration and retrieval algorithm. Most of this work has been sponsored by ESA (Purchase Order 143187 from 15/09/1994) and benefited from comments within the ERS-2 Radar Altimeter and Microwave Radiometer Commissioning Working Group chaired by Jerome Benveniste at ESA/ESRIN. The author would like to thank Philippe Gaspar and Pierre-Yves Le Traon for their helpful suggestions and remarks.
AVISO/Altimetry, 1996: AVISO user handbook for merged TOPEX/Poseidon products. AVI-NT-02-101-CN, Ed. 3.0, 196 pp. [Available from CLS, 8–10 rue Hermes, Parc Technologique du Canal, 31526 Ramonville St-Agne, France.].
Bernard, R., A. Le Cornec, L. Eymard, and L. Tabary, 1993: The microwave radiometer aboard ERS-1. Part 1: Characteristics and Performances. IEEE Trans. Geosci. Remote Sens.,31, 1186–1198.
CERSAT, 1994: Microwave radiometer products user manual. C1-EX-MUT-A21-02-CN, Issue 2, Revision 0, 05/09/94, 32 pp. [Available from CERSAT, IFREMER, BP 70, 29280 Plouzané, France.].
CLS, 1993: Quality assessment of CERSAT microwave radiometer products, 22/12/1993. CLS.OC/NT/93008, Ed. 1, 2 pp. [Available from CERSAT, IFREMER, BP 70, 29280 Plouzané, France.].
Eymard, L., L. Tabary, and A. Le Cornec, 1996: The microwave radiometer aboard ERS-1. Part 2: Validation of the retrieved geophysical data. IEEE Trans. Geosci. Remote Sens.,34, 291–303.
Fu, L. L, E. J. Christensen, C. A. Yamarone Jr., M. Lefebvre, Y. Ménard, M. Dorrer, and P. Escudier, 1994: TOPEX/Poseidon mission overview. J. Geophys. Res,99, 24 369–24 381.
Keihm, S. J., M. A. Janssen, and C. S. Ruf, 1995: TOPEX/Poseidon Microwave Radiometer (TMR). Part 3: Wet troposphere range correction algorithm and pre-launch error budget. IEEE Trans. Geosci. Remote. Sens.,33, 147–161.
Liebe, H. J., G. A. Hufford, and M. G. Cotton, 1993: Propagation modeling of moist air and suspended water/ice particles at frequencies below 1000 GHz. Proc. AGARD 52d Special Meeting of the Panel on Electromagnetic Wave Propagation, Palma de Mallorca, Spain, Advisory Group Aerosp. Res. Dev., 1–10.
Ruf, C., S. Keihm, M. Janssen, M. Subramanya, and T. Liu, 1994: TOPEX microwave radiometer performance and in-flight calibration. J. Geophys. Res,99, 24 915–24 926.
Stum, J., 1994: A comparison between TOPEX microwave radiometer, ERS-1 microwave radiometer, and European Centre for Medium-Range Weather Forecasts derived wet tropospheric corrections. J. Geophys. Res,99, 24 927–24 939.
Wilheit, T. T., and A. T. C. Chang, 1980: An algorithm for retrieval of ocean surface and atmospheric parameters from observations of the scanning multichannel microwave radiometer. Radio Sci.,15, 525–544.