Study of the wind variation effects in the upwelling system along the Peruvian Coast through data analysis and numerical modeling / Estudo dos efeitos de variações do vento no sistema de ressurgência ao longo da costa peruana através da análise de dados e modelagem numérica

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The objective of the present work was to study the effects of variability in the wind due to the El Niño-Southern Oscillation events in the surface circulation patterns of the Peruvian coast, by means of data analysis and numerical modeling. It is focused the period 1991-2000, when it was observed strong La Niña (1996-1997, 1998-2000) and El Niño events (1997-98). These events had strong effects worlwide but very little is known on the local impacts on the circulation, thermocline structure and the Ekman dynamics of the Peruvian coast. The data analysed in the present study were collected on transects along 5 S and 15 S. The model used was an implementation of the Princeton Ocean Model (POM). The numerical simulations were forced with wind products relative to the period of interest (1991-2000). The simulations reproduced satisfactorily the mean circulation patterns in the study area, confirming that the in the nearshore region the wind is the main driving mechanism for coastal upwelling/downwelling. The results show that during the strong 1997-1998 El Niño, a drastic alteration of the coastal upwelling system ocurred in response to the changes in the wind.

ASSUNTO(S)

modelagem numérica ekman dynamic princeton ocean model (pom) ressurgência costeira tensão cisalha- mento vento (tcv) coastal upwelling dinâmica de ekman wind stress (tcv) princeton ocean model (pom). corrente de humboldt humboldt current numerical modelling

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