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The maximum continuous no rain days is defined as the length of extreme drought period (LEDP hereafter) in this paper. In the present study, using the daily precipitation data ( 1960-2004) of 107 stations, the GIMMS NDVI data set (1982- 2003) of Northwest China, and the methods of EOF, REOF, correlation and wavelet analysis, the basic temporal-spatial distributions of the LEDP and its cycles and abrupt...
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