期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：1996
卷号：7
期号：1
页码：25-32
出版社：John Libbey Eurotext
摘要：Author Vincent Moron Centre de recherches de climatologie Bâtiment sciences « Gabriel », Université de Bourgogne, 6, boulevard Gabriel, 21000 Dijon, France Page(s) : 25-32 Published in: 1996 This study describes the spatiotemporal variability of annual rainfall in the area between 32,5°N and 32,5°S (period 1946-1992). Hierarchical clustering analysis was used to extract 52 clusters, containing 52% of the initial variance, from 685 grid-points (3,75°x2,5°). Tropical and subtropical areas (i.e. between approximately 10° and 32,5° north or south of the equator) were more homogeneous, whereas the subequatorial area (i.e. between 10° north and south of the equator) was less so. A number of subequatorial areas (such as the Nordeste, Gulf of Guinea, eastern Africa or the Central Pacific), however, were highly consistent. Time series analysis indicated the extent of decadal scale variability around the tropical Atlantic and in eastern Australia. The variance explained by the 3-to-8-year band was strongest around the Pacific basin and over eastern and southern Africa whereas the strongest variance explained by the quasi-biennial band was located over eastern Asia, a region affected by the boreal summer monsoon. A decadal scale mode, mainly concerning the northern tropics, was characterised by an opposition between the 1950s and the 1980s. The first mode of the 3-to-8-year band was associated with the ENSO phenomenon and was global in extent.
