Indian Ocean temperature dipole and SSTA in the equatorial Pacific Ocean

Abstract Controlled numerical experiments using ocean-only and ocean–atmosphere coupled general circulation models show that interannual sea level depression in the eastern Indian Ocean during the Indian Ocean dipole (IOD) events forces enhanced Indonesian Throughflow (ITF) to transport warm water from the upper-equatorial Pacific Ocean to the Indian Ocean. The enhanced transport produces elevation of the thermocline and cold subsurface temperature anomalies in the western equatorial Pacific Ocean, which propagate to the eastern equatorial Pacific to induce significant coupled evolution of the tropical Pacific oceanic and atmospheric circulation. Analyses suggest that the IOD-forced ITF transport anomalies are about the same amplitudes as those induced by the Pacific ENSO. Results of the coupled model experiments suggest that the anomalies induced by the IOD persist in the equatorial Pacific until the year following the IOD event, suggesting the importance of the oceanic channel in modulating the interannual climate variations of the tropical Pacific Ocean at the time lag beyond one year.

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Impacto do Plantio de Soja e do Oceano Pacífico Equatorial na Precipitação e Temperatura na Cidade de Chapadinha-MA (Impact of Soybean Planting and Equatorial Pacific Ocean Temperature and Precipitation in the City of Chapadinha-MA)

Revista Brasileira de Geografia Física ◽

10.26848/rbgf.v5i3.232870 ◽

2012 ◽

Vol 5 (3) ◽

pp. 708 ◽

Cited By ~ 1

Author(s):

Virgínia Fátima Bezerra Nogueira ◽

Magaly De Fátima Correia ◽

Valner Da Silva Nogueira

Keyword(s):

Pacific Ocean ◽

Rainfall Variability ◽

Equatorial Pacific ◽

Ocean Temperature ◽

Equatorial Pacific Ocean ◽

Monthly Data ◽

Local Climate ◽

Temperature And Precipitation ◽

The Impact ◽

The City

O Estado do Maranhão possui uma economia voltada para a agropecuária que engloba atividades relevantes como a criação de bovinos e o cultivo de arroz. Recentemente ocorreram mudanças importantes no sistema de produção agrícola pela introdução da soja substituindo áreas de cerrado. Neste trabalho é feita uma análise da variabilidade climática na região de Chapadinha MA utilizando dados mensais de precipitação e das temperaturas máximas e mínimas. Na quantificação do impacto da soja na variabilidade da precipitação, as análises foram concentradas no período de 1977 a 2009. A técnica da análise de variância e o teste t-Student foram usadas como principais ferramentas estatísticas na análise dos dados. Os resultados mostram que as alterações na cobertura e uso da terra afetaram o clima local. As principais mudanças foram observadas na temperatura mínima.Palavras - chave: Climatologia, impacto ambiental, soja, variabilidade interanual Impact of Soybean Planting and Equatorial Pacific Ocean Temperature and Precipitation in the City of Chapadinha-MA ABSTRACTThe State of Maranhão has an economy facing agriculture encompassing relevant activities such as cattle and rice cultivation. Recently there were major changes in agricultural production system by introducing soy replacing grassland areas. This paper presents an analysis of climate variability in the region of MA Chapadinha using monthly data of precipitation and maximum and minimum temperatures. In quantifying the impact of soy on rainfall variability, the analyzes were concentrated in the period from 1977 to 2009. The technique of analysis of variance and t-Student test were used as the main statistical tools for data analysis. The results show that changes in land use and cover affected the local climate. The major changes were observed in the minimum temperature.Keywords: Climatology, environmental impact, soybeans, interannual variability

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