%0 Conference Proceedings
%4 sid.inpe.br/mtc-m21b/2018/02.05.13.25
%2 sid.inpe.br/mtc-m21b/2018/02.05.13.25.17
%T Ocean patterns associated with drought events in different sectors of the Amazon Basin
%D 2018
%A Gomes, Mariah Sousa,
%A Herdies, Dirceu Luis,
%A Souza, Diego O.,
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Centro Nacional de Monitoramento e Alertas de Desastres Naturais (CEMADEN)
%@electronicmailaddress mariah.gomes@hotmail.com
%@electronicmailaddress dherdies@gmail.com
%B International Conference for Southern Hemisphere Meteorology and Oceanography, 12 (AMOS-ICSHMO)
%C Sydney, Australias
%8 05-09 feb.
%X Droughts of great proportions have been recurrent in the Amazon Basin in the last 20 years, with severe consequences for the population, altering river levels and impacting economic activities. SST anomalies in the North Atlantic Tropical (NAT) and East Equatorial Pacific oceans cause changes in atmospheric circulation patterns in remote regions, including the Amazon. Therefore, the objective of this work is to identify the oceanic conditions associated with the 1997-1998, 2005 and 2010 events in three different sectors of the region defined according to their precipitation regimes (71oW-61oW and 5oS-3oN, 61oW-51oW and 5oS-3oN, 71oW-51oW and 13oS-5oS). Monthly Precipitation Climatology Project (2.5° x 2.5° resolution) and Extended Reconstructed Sea Surface Temperature (2° x 2° resolution) datasets, derived from the International Comprehensive Ocean-Atmosphere Data Set, were used. Although the first event can be considered generalized, the largest precipitation anomalies were observed in the eastern part of the basin. Rainfall was below average between February 1997 and May 1998, when one of the most intense El Niņo Southern Oscilation (ENSO) was recorded. The 2005 drought was a response to a four years period of unusual reduced rainfall. Although precipitation anomalies were higher in the east between 2002 and 2004, period of moderate ENSO, they were more persistent in the west and south of the basin, mainly between 2003 and 2005, presenting an important correlation with the high temperatures observed in the NAT in that period . Similar behaviour was observed during the 2010 drought; with the beginning of ENSO in mid-2009, precipitation deficit was more visible in the eastern Amazon, and became larger in the west and south the following year, when NAT temperature remained above average during practically nearly entire year. Although such relationships can be established, it is necessary to analyse changes in atmospheric circulation patterns in these regions.
%@language en