@Article{CerónKAAAFMS:2021:ReInEx,
author = "Cer{\'o}n, Wilmar L. and Kayano, Mary Toshie and Andreoli, Rita
V. and Avila-Diaz, Alvaro and Ayes, Irma and Freitas, Edmilson D.
and Martins, Jorge A. and Souza, Rodrigo A. F.",
affiliation = "{Universidad del Valle} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade do Estado do Amazonas (UEA)}
and {Universidade Federal de Vi{\c{c}}osa (UFV)} and {Instituto
Nacional de Pesquisas da Amaz{\^o}nia (INPA)} and {Universidade
de S{\~a}o Paulo (USP)} and {Universidade Federal
Tecnol{\'o}gica do Paran{\'a} (UFTPR)} and {Universidade do
Estado do Amazonas (UEA)}",
title = "Recent intensification of extreme precipitation events in the La
Plata Basin in Southern South America (19812018)",
journal = "Atmospheric Research",
year = "2021",
volume = "249",
pages = "e105299",
month = "Feb.",
keywords = "La Plata Basin, Precipitation trends and changes, Extreme daily
rainfall, Climate extreme indices, CHIRPS.",
abstract = "Changes and trends in ten extreme daily rainfall indices in the La
Plata Basin (LPB) during the 19812018 period were analyzed. These
indices were evaluated for three regions in the LPB, namely the
northern, central, and southern LPB (N-LPB, C-LPB, and S-LPB,
respectively). A decrease in the maximum rainfall over five
consecutive days (RX5day) and an increase in the consecutive dry
days (CDD) were observed in N-LPB, mainly during the austral
winter. An increase in the total wet-day precipitation was found
in S-LPB, particularly during SeptemberNovember (SON), and during
DecemberFebruary (DJF). The number of heavy precipitation days
(R10mm) and CDD indices in S-LPB during SON showed a breaking
point in 1999 and were followed by an increase in R10mm after
1999. Therefore, we discussed the large-scale climatic features
that could be related to the breaking point in the extreme
precipitation indices found in the S-LPB during SON, through
correlation analysis. Our results indicate that R10mm shows
significant positive correlations with the sea surface temperature
(SST) in the Southwestern Subtropical Atlantic Region, mainly
between 32°S22°S and 50 W34°W. The SST anomaly index in this
oceanic region for SON during 19812018 displayed a significant
upward change in 1999. Furthermore, the correlation map between
this index and the vertically integrated moisture flux (VIMF) and
its divergence, shows negative correlations in the S-LPB, which
means a decrease of the moisture divergence in this region. This
implies an increase (decrease) of R10mm, and a decrease (increase)
of CDD in the S-LPB after (before) 1999. This relationship results
from an anticyclone in the Southwestern Atlantic extending into
the LPB up to 60°W, which causes an increase in the northwesterly
moisture flux over central and southern parts of the basin,
enhancing the moisture convergence over S-LPB. These insights have
not been discussed previously, and might be relevant for future
modeling studies and monitoring tasks.",
doi = "10.1016/j.atmosres.2020.105299",
url = "http://dx.doi.org/10.1016/j.atmosres.2020.105299",
issn = "0169-8095",
language = "en",
targetfile = "ceron_recent.pdf",
urlaccessdate = "19 maio 2024"
}