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| Mcmillan, A; Quartly, G; Srokosz, M; Tournadre, Jean. |
| [1] Recently developed algorithms have shown the potential recovery of rainfall information from spaceborne dual-frequency altimeters. Given the long mission achieved with TOPEX and the prospect of several other dual-frequency altimeters, we need to validate the altimetrically derived values so as to foster their integration with rain information from different sensors. Comparison with some alternative climatologies shows the bimonthly means for TOPEX to be low. Rather than apply a bulk correction we investigate individual rain events to understand the cause of TOPEX's underestimation. In this paper we compare TOPEX with near-simultaneous ground-based rain radars based at a number of locations, examining both the detection of rain and the quantitative... |
| Tipo: Text |
Palavras-chave: Attenuation; Validation; Rain; Satellite remote sensing; TOPEX. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-695.pdf |
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| Chen, G; Chapron, Bertrand; Ezraty, Robert; Vandemark, D. |
| More than a dozen of wind speed (U) algorithms have been proposed during the past 2 decades, as a result of a continuing effort to improve altimeter wind measurement. The progress in terms of accuracy, however, is seen to be rather slow. The reported root mean square (RMS) error of prevailing algorithms varies mostly between 1.6 and 2.0 m/s for the dominant wind regime. As far as the TOPEX altimeter is concerned, three measured quantities, namely, the radar cross sections from Ku and C band (sigma(Ku) and sigma(C)), as well as the significant wave height (H-s), have been used in previous algorithm developments, resulting in a variety of single-, dual-, and three-parameter model functions. On the basis of the finding of a banded dependency of the... |
| Tipo: Text |
Palavras-chave: Sea surface wind speed; Retrieval; TOPEX; Altimeter; Dual frequency. |
| Ano: 2002 |
URL: https://archimer.ifremer.fr/doc/00000/10224/9579.pdf |
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