@Article{ZouMacSamRamKur:2018:ChEx20,
author = "Zou, Yong and Macau, Elbert Einstein Nehrer and Sampaio, Gilvan
and Ramos, Ant{\^o}nio M{\'a}rio de Torres and Kurths,
J{\"u}rgen",
affiliation = "{East China Normal University} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {University of Aberdeen}",
title = "Characterizing the exceptional 2014 drought event in S{\~a}o
Paulo by drought period length",
journal = "Climate Dynamics",
year = "2018",
volume = "51",
number = "1/2",
pages = "433--442",
month = "July",
keywords = "Drought period length · Precipitation · Southeast Brazil · Sea
surface temperature · Sea level pressure · South Atlantic ocean.",
abstract = "In the last decade, the southeast region of Brazil has been
suffering severe water shortages. Here, we propose to compute the
expected drought period length to characterize the drought events
in the region of S{\~a}o Paulo. We report the unique properties
of the exceptional drought event during the austral summer 2014 by
showing the differences and similarities to the very dry season in
2001 and the mild dry seasons in 2006 and 2015. Furthermore, we
investigate the correlations of the abnormal precipitation deficit
with the ocean and atmospheric patterns. In comparison to other
drought events, we validate the hypothetical mechanism that
underlies the exceptional drought 2014: (1) The existence of an
anomalous high pressure center in the area acts as a blocking
mechanism that prevents moisture transport from the Amazon and
passage of cold front systems from south Brazil. This blocking
high has been observed in all dry seasons considered, with much
larger magnitude in 2014. (2) The much faster increasing trend of
the anomalous sea surface temperature acts as a strong feedback
which intensified the extreme climate conditions. The
unprecedented increasing trend of the SST in 2014 was not observed
in other climate variables representing a high pressure center.
Therefore, we conclude that the exceptional drought 2014 was
enhanced by the feedback mechanism of anomalous warming of SST in
the South Atlantic Oceans, which was resulted from the anomalous
high pressure.",
doi = "10.1007/s00382-017-3932-2",
url = "http://dx.doi.org/10.1007/s00382-017-3932-2",
issn = "0930-7575",
language = "en",
targetfile = "zou_characterizing.pdf",
urlaccessdate = "19 abr. 2024"
}