A diagnosis of rainfall over South America during 1997/98 El Niño and 1998/99 La Niña events: Comparison between TRMM PR and GPCP rainfall estimates
作者： Sergio H. Franchito , V. Brahmananda Rao , Ana C. Vasques , Clovis M. E. Santo , Jorge C. Conforte
DOI: 10.1007/S12040-009-0013-X
关键词: Climatology 、 Environmental science 、 Rain gauge 、 El Niño 、 Radiance 、 La Niña 、 Random error 、 Longwave 、 Convective rainfall 、 Satellite data
摘要: A comparison between TRMM PR rainfall estimates and rain gauge data from ANEEL combined gauge/satellite GPCP over South America (SA) is made. In general, the annual seasonal regional characteristics of SA are qualitatively well reproduced by GPCP. It found that most exceeds rainfall. The largest positive differences occur in north SA, northwestern central Amazonia. However, there regions where lower than PR, particularly Pacific coastal southern Brazil. We suggest cause for minus related to fact satellite observations based on infrared radiation outgoing longwave radiance sensors overestimate convective negative due random errors PR. Rainfall latter phases 1997/98 El Nino 1998/99 La Nina analyzed. results showed anomalies generally higher however, as mean case, (negative) which Amazonia (southern Brazil), reduced (increased) event. This during episode decreases increases Consequently, overestimation increased these two regions, respectively.
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