@InProceedings{GomesHerdSouz:2018:OcPaAs,
author = "Gomes, Mariah Sousa and Herdies, Dirceu Luis and Souza, Diego O.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Centro Nacional de
Monitoramento e Alertas de Desastres Naturais (CEMADEN)}",
title = "Ocean patterns associated with drought events in different sectors
of the Amazon Basin",
year = "2018",
organization = "International Conference for Southern Hemisphere Meteorology and
Oceanography, 12. (AMOS-ICSHMO)",
abstract = "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.",
conference-location = "Sydney, Australias",
conference-year = "05-09 feb.",
language = "en",
urlaccessdate = "13 maio 2024"
}