@MastersThesis{Soares:2009:EsCoAt,
author = "Soares, Helena Cachanhuk",
title = "Estudo das condi{\c{c}}{\~o}es atmosf{\'e}ricas e
oce{\^a}nicas do atl{\^a}ntico sudoeste e suas
associa{\c{c}}{\~o}es com extremos de captura da
sardinha-verdadeira",
school = "Instituto Nacional de Pesquisas Espaciais",
year = "2009",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2009-03-31",
keywords = "climatologia, an{\'a}lise atmosf{\'e}rica e oce{\^a}nica,
atl{\^a}ntico sudoeste, compostos, Sardinella Brasiliensis,
climatology, atmospheric and oceanic analysis, southwest atlantic,
composites, Sardinellea Brasiliensis.",
abstract = "A Sardinha-verdadeira {\'e} um importante recurso pesqueiro do
pa{\'{\i}}s, com ocorr{\^e}ncia restrita {\`a} Plataforma
Continental Sudeste brasileira. A s{\'e}rie de desembarque desta
esp{\'e}cie apresenta anos de alta captura, como o m{\'a}ximo em
1973 com 225 mil toneladas, e m{\'{\i}}nimos como o caso em 2000
com 20 mil toneladas. Neste trabalho s{\~a}o estudadas as
caracter{\'{\i}}sticas oce{\^a}nicas e atmosf{\'e}ricas
presentes no per{\'{\i}}odo de maior desova da
Sardinha-verdadeira, meses de dezembro e janeiro, com o intuito de
investigar as causas dos extremos de captura. Para isto foram
analisadas vari{\'a}veis oce{\^a}nicas como temperatura da
superf{\'{\i}}cie do mar, tens{\~a}o do vento {\`a}
superf{\'{\i}}cie do mar, transporte de Ekman e {\'{\i}}ndice
de mistura. Tamb{\'e}m foram analisadas vari{\'a}veis
atmosf{\'e}ricas, como precipita{\c{c}}{\~a}o,
radia{\c{c}}{\~a}o de onda longa emergente, ventos e altura
geopotencial. Em uma primeira etapa foi realizada a discuss{\~a}o
da climatologia dessas vari{\'a}veis, para o per{\'{\i}}odo
entre 1970 e 2001. Depois de estudado o comportamento m{\'e}dio
atmosf{\'e}rico e oce{\^a}nico foi realizado o estudo dos
extremos de captura. Para isto foram selecionados os anos
positivos e negativos de maior captura, e elaborado campos
m{\'e}dios das vari{\'a}veis e de suas anomalias. Com isso foi
poss{\'{\i}}vel identificar que um excesso de mistura e
transporte na parte norte da PCS, durante o per{\'{\i}}odo da
desova est{\'a} associado a uma baixa captura no ano seguinte. O
que pode ser explicado, uma vez que, o excesso de mistura e de
transporte pode destruir as part{\'{\i}}culas de alimento e
provocar a dispers{\~a}o de ovos e larvas. Na atmosfera foi
identificado um sinal de maior atua{\c{c}}{\~a}o de ZCAS e
sistemas frontais sobre a PCS, no per{\'{\i}}odo de desova
associados aos extremos positivos. Estes sistemas podem causar
mudan{\c{c}}a no padr{\~a}o predominante de ventos na PCS, e
como consequ{\^e}ncia, no {\'{\i}}ndice de mistura e transporte
da regi{\~a}o. ABSTRACT: The Brazilian Sardine is an important
fishing resource for the country, with restricted occurrence in
the Southeast Brazilian Bight (SBB). Landing records of this
species shows years of high capture, as in 1973 with 225 thousand
tons and the minimum in 2000 with 20 thousand tons. In this work
was studied the oceanic and atmospheric characteristics of the
most important spawning period, December and January, with the
intention to investigate its possible relations with the catch
extremes. The analysis was concentrated on relevant oceanic
variables such as sea surface temperature, sea surface wind
stress, Ekman transport and wind mixing index. The atmospheric
variables investigated were precipitation, outgoing longwave
radiation, wind and geopotential height. First, it was discussed
the climatology of these variables for the period between 1970 and
2001. After the average atmospheric and oceanic behavior was
investigated, the catch extremes were assessed. For that purpose
it was selected the positive and negative years and calculated the
average of variables and its anomalies. With this study was
possible to identify that an excess of water mixing and surface
transport in the north of SBB, during the spawning period is
associated with low capture in the next year. This occurs because
the excess of mixing and transport can to destroy food particles
and could cause the dispersion of the eggs and larvae. An increase
in the frequency of South Atlantic Convergence Zone and frontal
systems over SBB, in the spawning period is associated with
positive catch extremes. These systems can cause changes in the
direction of winds in SBB, influencing the surface mixing and
transport in the region.",
committee = "Angelis, Carlos Frederico (presidente) and Pezzi, Luciano Ponzi
(orientador) and Kayano, Mary Toshie and Gherardi, Douglas
Francisco Marcolino e and Wainer, Ilana Elazari Klein Coaracy",
copyholder = "SID/SCD",
englishtitle = "Study of the atmospheric and oceanic conditions in the southweast
atlantic and its relation with the Brazilian sardine catch
extremes",
language = "pt",
pages = "147",
ibi = "8JMKD3MGP8W/34S9BUB",
url = "http://urlib.net/ibi/8JMKD3MGP8W/34S9BUB",
targetfile = "publicacao.pdf",
urlaccessdate = "21 maio 2024"
}