@InProceedings{RoquedaSilvaFranRibe:2006:ClVaOv,
author = "Roque da Silva, Felipe das Neves and Fran{\c{c}}a, Jos{\'e}
Ricardo de Almeida and Ribeiro, Laura Alice de Ara{\'u}jo",
affiliation = "Centro Federal de Educa{\c{c}}{\~a}o Tecnol{\'o}gica Celso
Suckow da Fonseca (CEFET-RJ), Coordenadoria de Meteorologia and
Avenida Maracn{\~a} 229, Bloco A, 4º andar, Maracan{\~a}.
20271-110 Rio de Janeiro, RJ, Brazil (Roque da Silva) and
Universidade Federal do Rio de Janeiro (UFRJ), Centro de
Ci{\^e}ncias Matem{\'e}ticas e da Natureza, Instituto de
Geoci{\^e}ncias, Departamento de Meteorologia and Avenida
Brigadeiro Trompowski, s/n, Bloco G, Ilha do Fund{\~a}o.
21941-590 Rio de Janeiro, RJ, Brazil (Fran{\c{c}}a and Ribeiro)",
title = "Climate variability over South America and South Atlantic
associated to sea surface temperature (SST) anomalies in tropical
Pacific and subtropical South Atlantic Oceans",
booktitle = "Proceedings...",
year = "2006",
editor = "Vera, Carolina and Nobre, Carlos",
pages = "1355--1358",
organization = "International Conference on Southern Hemisphere Meteorology and
Oceanography, 8. (ICSHMO).",
publisher = "American Meteorological Society (AMS)",
address = "45 Beacon Hill Road, Boston, MA, USA",
keywords = "El-Niño, La-Niña, Southern oscillation, climate variability, South
Atlantic Convergence Zone (SACZ).",
abstract = "The objective of this work is to use the Laboratoire de
M{\'e}t{\'e}orologie Dynamique (LMD - France) Atmosphere General
Circulation Model to investigate the relationship between SST
anomalies in Pacific and Atlantic Oceans (in the confluence region
of Brazil and Falklands currents) and the climate variability over
South America and South Atlantic. Particularly this work has
intended to study how the climate in these regions behaves when
the position of Brazil and Falklands currents was modified, along
with El Niño, La Niña and neutrality situations in the tropical
Pacific. Initially it was made a simulation using climatological
SSTs (control simulation). Next, idealized scenarios (forced) have
been created for simulating the presence of El Niño/La Niña and/or
positive/negative SST anomalies in the confluence region of Brazil
and Falklands currents (in the other regions SST remains
climatological). In fact, in the confluence region, it was used
positive SST anomalies to simulate the Brazil current more to the
South and negative ones in case of the Falklands currents more to
the North. All the simulations (control and forced) have had the
same initial conditions. This way, nine simulations have been
generated. All of them had been run from October to February using
ensemble forecasting technique with ten members each. Results had
been generated for December/January/February summer trimester.
Initial data correspond to the first ten days of October 1997
proceeding from NCEP (National Centers for Environmental
Prediction) reanalysis at 00 UTC. Sea surface temperature (SST)
data are from optimum interpolation (OI) analysis. This data
correspond the monthly means between 1971 and 2000 and they had
been interpolated to daily values to force the model. Both initial
and boundary data had been interpolated to the model grid. Results
show that the greatest effect of SST anomalies in the confluence
region occur in the SACZ region. Positive SST anomalies tend to
diminish precipitation in the SACZ region, while negative SST
anomalies cause an increase in this region. These alterations are
linked to changes in pressure patterns in this region. In relation
to the joint effect of El Niño and positive/negative SST anomalies
in the Atlantic, increase of precipitation in the SACZ region was
evidenced in both cases. Similar results had been found for La
Niña and positive/negative SST anomalies in the Atlantic.",
conference-location = "Foz do Igua{\c{c}}u",
conference-year = "24-28 Apr. 2006",
language = "en",
organisation = "American Meteorological Society (AMS)",
ibi = "cptec.inpe.br/adm_conf/2005/10.13.17.55",
url = "http://urlib.net/ibi/cptec.inpe.br/adm_conf/2005/10.13.17.55",
targetfile = "557-562.pdf",
type = "Role of the SH oceans in climate",
urlaccessdate = "15 jun. 2024"
}