@Article{Escobar:2014:CiPaSu,
author = "Escobar, Gustavo Carlos Juan",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Circulation patterns in surface and 500 hPa over South America and
events of positives precipitation anomalies on the Minas Gerais
state during december of 2011 / Padr{\~o}es de
circula{\c{c}}{\~a}o em superf{\'{\i}}cie e em 500 hPa na
Am{\'e}rica do sul e eventos de anomalias positivas de
precipita{\c{c}}{\~a}o no estado de minas gerais durante o
m{\^e}s de dezembro de 2011",
journal = "Revista Brasileira de Meteorologia",
year = "2014",
volume = "29",
number = "1",
pages = "105--124",
keywords = "classifica{\c{c}}{\~a}o sin{\'o}tica, componentes principais,
chuvas an{\^o}malas, synoptic clasification, principal
components, anomalous rainfall.",
abstract = "This paper presents a classification of atmospheric circulation
fields in surface and 500 hPa over South America during the month
of December, in order to identify the main synoptic patterns that
influence the weather in the Southeast region of Brazil,
especially in the state of Minas Gerais (MG). To this purpose, the
Rotated Principal Component Analysis technique was applied to the
NCEP reanalysis for the period 1986-2011. The principal aim of
this classification was to determine the circulation patterns
prevailing during the month of December 2011 related to the
anomalous rainfall occurred in the State of Minas Gerais (MG). The
results provide six circulation patterns in surface and four
circulation patterns in altitude that are representative of about
72.8% and 94% of all the cases, respectively. Three main surface
circulation patterns associated with higher probability of
precipitation over the State of MG were found. One of them was
associated with the advance of a cold front that reaches the
southern part of the Southeast region of Brazil (PSP2-Sup), and
two others (PSP3-Sup and PSP5-Sup) related to a {"} dipole{"}
blocking configuration over Atlantic ocean determined by an
anticyclone located around 50 ° W, 45 ° S and a low positioned
north of the anticyclone around 25 ° S. At 500 hPa two main
circulation patterns were associated with the occurrence of
significant precipitation over the State of MG reflecting the low
level circulation; one associated with a cold front (PSP2-500) and
another related to a {"} dipole{"} blocking situation over the
Atlantic Ocean (PSP4-500). The anomalous rainfall observed during
December 2011 were associated directly with the PSP3-Sup and
PSP4-500 and both of them were related to the performance of South
Atlantic Convergence Zone (SACZ) episodes.",
doi = "10.1590/S0102-77862014000100011",
url = "http://dx.doi.org/10.1590/S0102-77862014000100011",
issn = "0102-7786",
label = "scopus 2014-05 Escobar:2014:CiPaSu",
language = "pt",
urlaccessdate = "02 maio 2024"
}