@Article{LimaAndrKaya:2018:SuVaSo,
author = "Lima, Alexandra Amaro de and Andreoli, Rita Val{\'e}ria and
Kayano, Mary Toshie",
affiliation = "{Instituto Nacional de Pesquisas da Amaz{\^o}nia (INPA)} and
{Universidade do Estado do Amazonas} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "Sub-monthly variability of the South American summer precipitation
under El Niño and La Niña backgrounds during the 1998–2012
period",
journal = "International Journal of Climatology",
year = "2018",
volume = "38",
number = "5",
pages = "2153--2166",
month = "Apr.",
keywords = "sub-monthly intra-seasonal variability, inter-annual variability,
precipitation, South America, Rossby wave.",
abstract = "The sub-monthly intra-seasonal 824-day period (SIS8-24) timescale
variability of the summer (1 November to 31 March) rainfall over
South America (SA) under distinct inter-annual (IA) backgrounds
was analysed using the Tropical Rainfall Measure Mission (TRMM)
based daily total precipitation data for the 19982012 period. The
IA backgrounds refer to the El Niño (EN) and La Niña (LN) years.
First, the summer daily precipitation anomaly fields were subject
to the empirical orthogonal function (EOF) analysis. Using the
first and the second principal component time series filtered at
the SIS8-24 timescale, positive and negative events were selected.
The first SIS8-24 mode features a precipitation anomaly dipole
with centres over southeastern SA (SESA) and central and eastern
tropical SA both extending southeastwards into the adjacent
Atlantic Ocean. The second mode features a precipitation anomaly
pattern similar to that previously documented for the oceanic
South Atlantic convergence zone (SACZ). The SIS8-24 precipitation
anomaly patterns for the positive (negative) events show
differences in the anomaly intensities between EN and LN years,
but with almost the same locations of the anomaly centres. These
differences result from the variability inter-SIS8-24 events, as
indicated by the distinct paths of the SIS8-24 Rossby wave train
patterns in the subtropics, although they are regionally locked
over tropical SA. The relation between the SIS8-24 and IA
variabilities might occur through variations in the Rossby wave
train patterns. The Rossby wave trains of both timescales,
depending on their phases, reinforce or weaken the rainfall
anomalies over SA, in such a way that the rainfall anomalies over
SA show similar patterns but with distinct magnitudes for EN and
LN composites. The South American precipitation responses to the
combined SIS8-24 and IA variability timescales stratified
according to the IA backgrounds have not been studied before and
might be useful for operational forecasting services.",
doi = "10.1002/joc.5430",
url = "http://dx.doi.org/10.1002/joc.5430",
issn = "0899-8418",
language = "en",
targetfile = "lima_sub.pdf",
urlaccessdate = "29 jun. 2024"
}