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TÃcnicas de Sensoriamento Remoto para Monitoramento Ambiental com AplicaÃÃes em Recursos Pesqueiros no AtlÃntico Tropical / Techniques of Remote Sensing for Environmental Monitoring with Applications in the Atlantic Tropical Fishing Resources

In this work we studied, from data obtained from sensors on board satellites, monthly and seasonal patterns of physical and biological parameters on the Tropical Atlantic, the area between the latitudes 30 Â N - 30 Â S and longitudes 80 Â W - 5 Â E. The physical environment (temperature of the sea surface, measured by the sensor VHRR and wind, measured by sensors and SeaWinds MAI), combined with data from clorof1la it (measured by the sensor SeaWiFS), have revealed aspects of the seasonal cycle and interannual parameters on the Tropical Atlantic. It was found that areas with more TSMs is preferably heated encounter. North of Ecuador, during almost the whole year except March, April and May, where they are positioned in the southern hemisphere. For the average monthly wind fields, it was found that the Alisios the Northeast are more intense than the Southeast during the austral winter and spring, and the converse for stations in boreal winter and spring. The images of c1orofila it showed the enrichment of bodies of surface water, especially the equatorial divergence and retroflexion of the North Brazil Current. The study of three species of tuna (Yellowfin Lage, White and mandolinist), caught in the area between 15 Â N - 15 Â S and 500 W - 15 Â W through the analysis of time series, showed that the catch per unit of effort (CPUE) for Albacora Lage tend White and non-estacionaridade while mandolinist Albacora tended to estacionaridade. The differences between the monthly and annual CPUES of the three species were studied through the use of models of analysis of variance, with relations between the CPUEs and the environmental variables listed above, were correlated, allowing the fit of simple linear models and multiple, and in some cases was applied logarithmic transformation in the value of variables. / Neste trabalho foram estudados, a partir de dados obtidos atravÃs de sensores a bordo de satÃlites, os padrÃes mensais e sazonais de parÃmetros fÃsicos e biolÃgicos sobre o AtlÃntico Tropical, para a Ãrea compreendida entre as latitudes 30Â N - 30Â S e longitudes 80ÂW - 5Â E. As propriedades fÃsicas ambientais (temperatura da superfÃcie do mar, medida pelo sensor A VHRR; e vento; medido pelos sensores AMI e SeaWinds), combinados com dados de clorof1la-a (medida pelo sensor SeaWiFS), revelaram aspectos do ciclo sazonal e interanual desses parÃmetros sobre o AtlÃntico Tropical. Verificou-se que Ãreas com TSMs mais aquecidas encontram se preferencialmente .ao norte do Equador, durante praticamente todo o ano, com exceÃÃo de marÃo, abril e maio, onde estas se posicionam no hemisfÃrio sul. Para os campos mÃdios mensais do vento, verificou-se que os AlÃsios de Nordeste sÃo mais intensos que os de Sudeste durante as estaÃÃes de inverno e primavera austral, sendo o inverso para estaÃÃes de inverno e primavera boreal. As imagens de c1orofila-a revelaram o enriquecimento das massas d'Ãguas superficiais, destacando-se a divergÃncia equatorial e a retroflexÃo da Corrente Norte do Brasil. O estudo das trÃs espÃcies de atuns (Albacoras Lage, Branca e Bandolin), capturadas na Ãrea compreendida entre 15Â N - 15Â S e 500 W - 15Â W atravÃs da anÃlise de sÃries temporais, mostrou que a Captura por Unidade de EsforÃo (CPUE) para as Albacoras Lage e Branca apresentam tendÃncia de nÃo-estacionaridade, enquanto a Albacora Bandolin apresenta tendÃncia de estacionaridade. As diferenÃas encontradas entre as CPUES mensais e anuais das trÃs espÃcies, foram estudadas atravÃs do uso de modelos de anÃlise de variÃncia, sendo que as relaÃÃes entre as CPUEs e as variÃveis ambientais citadas anteriormente, apresentaram correlaÃÃes significativas, permitiindo o ajuste de modelos lineares simples e mÃltiplos, e em alguns casos aplicou-se transformaÃÃo logarÃtmica no valor das variÃveis.

Identiferoai:union.ndltd.org:IBICT/oai:www.teses.ufc.br:2565
Date08 August 2005
CreatorsAntonio Geraldo Ferreira
ContributorsCarlos Artur Sobreira Rocha
PublisherUniversidade Federal do CearÃ, Programa de PÃs-GraduaÃÃo em CiÃncias Marinhas Tropicais, UFC, BR
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis
Formatapplication/pdf
Sourcereponame:Biblioteca Digital de Teses e Dissertações da UFC, instname:Universidade Federal do Ceará, instacron:UFC
Rightsinfo:eu-repo/semantics/openAccess

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