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      On the influences of the El Niño, La niña and Atlantic Dipole Paterni on the Amazonian Rainfall during 1960-1998 Translated title: Sobre a Influência do El Niño, La Niña e Padrão De Dipolo do Atlântico na precipitação da amazônia durante 1960-1998

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          Abstract

          The influence of the large-scale climatic variability dominant modes in the Pacific and in the Atlantic on Amazonian rainfall is investigated. The composite technique of the Amazon precipitation anomalies is used in this work. The basis years for these composites arc those in the period 1960-1998 with occurrences of extremes in the Southern Oscillation (El Niño or La Niña) and the north/south warm (or cold) sea surface temperature (SST) anomalies dipole pattern in the tropical Atlantic. Warm (cold) dipole means positive (negative) anomalies in the tropical North Atlantic and negative (positive) anomalies in the tropical South Atlantic. Austral summer and autumn composites for extremes in the Southern Oscillation (El Niño or La Niña) and independently for north/south dipole pattern (warm or cold) of the SST anomalies in the tropical Atlantic present values (magnitude and sign) consistent with those found in previous works on the relationship between Amazon rainfall variations and the SST anomalies in the tropical Pacific and Atlantic. However, austral summer and autumn composites for the years with simultaneous occurrences of El Niño and warm north/south dipole of the SST anomalies in the tropical Atlantic show negative precipitation anomalies extending eastward over the center-eastern Amazon. This result indicates the important role played by the tropical Atlantic in the Amazon anomalous rainfall distribution.

          Translated abstract

          A influência dos modos dc variabilidade climática dc grande escala dominantes no Pacifico e Atlântico nas chuvas da Amazônia é investigada. A técnica de compósitos das anomalias dc precipitação na Amazônia é usada neste trabalho. Os anos base destes compósitos são aqueles do período 1960-1998 com ocorrências de extremos na Oscilação Sul (El Niño ou La Niña) e de padrão de dipolo norte/sul quente (ou frio) nas anomalias de TSM no Atlântico tropical. Dipolo quente (frio) significa anomalias positivas (negativas) no Atlântico tropical Norte e negativas (positivas) no Atlântico tropical Sul. Compósitos dc verão e outono austrais para extremos na Oscilação Sul (El Niño ou La Niña) e independente para padrão de dipolo norte/sul (quente ou frio) de anomalias de TSM no Atlântico tropical, apresentam valores (magnitude e signal) consistentes com aqueles encontrados cm trabalhos anteriores sobre a relação entre as variações de precipitação na Amazônia c anomalias de TSM no Pacífico e Atlântico tropicais. No entanto, compósitos dos verões e outonos austrais para os anos com ocorrências simultâneas de El Niño e dipolo quente norte/sul dc anomalias de TSM no Atlântico tropical mostram anomalias negativas de precipitação estendendo-se para leste sobre a Amazônia ccntro-leste. Este resultado indica o importante papel desempenhado pelo Atlântico tropical na distribuição anômala de precipitação na Amazônia.

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          Author and article information

          Contributors
          Role: ND
          Role: ND
          Role: ND
          Role: ND
          Role: ND
          Role: ND
          Journal
          aa
          Acta Amazonica
          Acta Amaz.
          Instituto Nacional de Pesquisas da Amazônia (Manaus )
          1809-4392
          June 2000
          : 30
          : 2
          : 305-318
          Affiliations
          [1 ] Instituto Nacional de Pesquisas Espaciais Brazil
          [2 ] Centro de Previsão de Tempo e Estudos Climáticos Brasil
          [3 ] Centro Técnico Aeroespacial Brasil
          Article
          S0044-59672000000200305
          10.1590/1809-43922000302318
          9f7c2ea5-eb9f-4a9e-abec-26fca939a418

          http://creativecommons.org/licenses/by/4.0/

          History
          Product

          SciELO Brazil

          Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0044-5967&lng=en
          Categories
          AGRONOMY
          BIOLOGY
          ZOOLOGY

          General life sciences,Animal science & Zoology,Horticulture
          Amazon,Seasonal rainfall,Chuva sazonal,ENOS,Amazônia,Dipolo norte-sul de anomalias de TSM,ENSO,SST anomalous north-south dipole in the Atlantic

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