@InProceedings{PezziSouLenGarMat:2006:SiOcSi,
author = "Pezzi, Luciano Ponzi and Souza, Ronald Buss and Lentini, Carlos A.
D. and Garcia, Carlos A. and Mata, Mauricio M.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "Simultaneous ocean-atmosphere in situ observations at the
Brazil-Malvinas Confluence region",
booktitle = "Proceedings...",
year = "2006",
editor = "Vera, Carolina and Nobre, Carlos",
pages = "1323--1328",
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 = "ocean-atmosphere interaction, Brazil-Malvinas confluence, in situ
observations, MABL-OBL.",
abstract = "The Brazil-Malvinas Confluence (BMC) region is acknowledged as one
of the most energetic regions of the World´s Ocean. This region is
characterized by the meeting of two opposing boundary currents:
the Brazil and the Malvinas currents. At the Confluence, tropical
warm and saline waters, transported by the Brazil Current (BC),
interact with subantarctic cool and less saline waters of the
Malvinas Current (MC), forming an active and nonsteady meandering
frontal region. Moreover, due to the BMC closeness to the
continent, its impact over the regional climate may be
significant, although this issue has never been thoroughly
investigated. This work presents novel simultaneous in situ
ocean-atmosphere (OA) observations at the BMC region based on
observational data collected simultaneously at both the Marine
Atmospheric Boundary Layer (MABL) and the Oceanic Boundary Layer
(OBL) on board the Brazilian Navy R/V Ary Rongel in November 2004.
To our knowledge, this is the first simultaneous observation of
the MABL and the OBL in the region. Furthermore, it is expected
that the MABL would be affected by the BMC dynamics due to its
high spatial-temporal variability. Our results show that air-sea
exchanges are closely correlated with the SST fields. Heat flux
calculations range from 110 W.m-2 over warm waters down to 18
W.m-2 over cold waters. High values of heat flux and air-sea
temperature differences are associated with relatively strong
near-surface winds. On the absence of strong large-scale synoptic
systems, our observations suggest that MABL is modulated by the
strong local sea surface thermal gradients. These measurements
have shown that OA exchanges are closely related to the SST
fields: weak (strong) winds are observed over cold (warm) waters
in a cool (warm) atmosphere, which indicates a stable (unstable)
MABL. This suggests that the MABL is modulated at the synoptic
temporal and spatial scale by strong surface thermal gradients
between the warm Brazil and the cool Malvinas currents. This
process has been documented at the synoptic scale for other
regions around the world but not yet for the BMC region. The
prevailing mechanisms between the local forcing, which induce the
MABL-OBL interaction, and the large scale on modulating the
air-sea interaction are still an open issue and deserve further
investigation. A new cruise is going to take place November 2005
and the same sampling strategy will be repeated.",
conference-location = "Foz do Igua{\c{c}}u",
conference-year = "24-28 Apr. 2006",
copyholder = "SID/SCD",
language = "en",
organisation = "American Meteorological Society (AMS)",
ibi = "cptec.inpe.br/adm_conf/2005/10.21.16.28",
url = "http://urlib.net/ibi/cptec.inpe.br/adm_conf/2005/10.21.16.28",
targetfile = "1323-1328.pdf",
type = "Role of the SH oceans in climate",
urlaccessdate = "03 jun. 2024"
}