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Title: Rainfall trends in the Brazilian Amazon Basin in the past eight decades
Authors: Satyamurty, Prakki
Castro, Aline Anderson de
Tóta, Júlio
Silva Gularte, Lucia Eliane da
Manzi, Antônio Ocimar
Keywords: Annual Variation
Data Set
Regional Climate
Seasonal Variation
Trend Analysis
Amazon Basin
South America
Issue Date: 2010
metadata.dc.publisher.journal: Theoretical and Applied Climatology
metadata.dc.relation.ispartof: Volume 99, Número 1-2, Pags. 139-148
Abstract: Rainfall series at 18 stations along the major rivers of the Brazilian Amazon Basin, having data since 1920s or 1930s, are analyzed to verify if there are appreciable long-term trends. Annual, rainy-season, and dry-season rainfalls are individually analyzed for each station and for the region as a whole. Some stations showed positive trends and some negative trends. The trends in the annual rainfall are significant at only six stations, five of which reporting increasing trends (Barcelos, Belem, Manaus, Rio Branco, and Soure stations) and just one (Itaituba station) reporting decreasing trend. The climatological values of rainfall before and after 1970 show significant differences at six stations (Barcelos, Belem, Benjamin Constant, Iaurete, Itaituba, and Soure). The region as a whole shows an insignificant and weak downward trend; therefore, we cannot affirm that the rainfall in the Brazilian Amazon basin is experiencing a significant change, except at a few individual stations. Subregions with upward and downward trends are interspersed in space from the far eastern Amazon to western Amazon. Most of the seasonal trends follow the annual trends, thus, indicating a certain consistency in the datasets and analysis. © 2009 Springer-Verlag.
metadata.dc.identifier.doi: 10.1007/s00704-009-0133-x
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