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AGU: Geophysical Research Letters

 

Index Terms

  • Global Change: Oceans
  • Atmospheric Processes: Climate change and variability
  • Atmospheric Processes: Ocean/atmosphere interactions

Abstract

Atlantic SST gradient and the influence of ENSO

Huei-Ping Huang

Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA

Andrew W. Robertson

International Research Institute for Climate Prediction, Columbia University, Palisades, New York, USA

Yochanan Kushnir

Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA

The relationship between the boreal winter El Niño SST anomaly and boreal spring tropical Atlantic SST gradient (North Atlantic minus South Atlantic) is investigated using a long, detrended SST record. For both El Niño and La Niña, concordant cases (same sign for NINO3 index and Atlantic SST gradient) slightly dominate over discordant ones, reflecting the fact that the NINO3 index correlates more strongly with the North Atlantic than the South Atlantic SST anomaly. The ratio of the numbers of concordant and discordant cases is 4:3 overall, indicating strong non-ENSO influences on the Atlantic SST gradient. The composite of the concordant cases shows an SST anomaly in the North Atlantic with the same sign as NINO3 and an opposite-signed anomaly off the southwest coast of Africa resembling “Benguela Niño”. That of the discordant cases is dominated by a pre-existing SST anomaly with the same sign as NINO3 in the south-central South Atlantic.

Received 29 June 2005; accepted 12 September 2005; published 21 October 2005.

Citation: Huang, H.-P., A. W. Robertson, and Y. Kushnir (2005), Atlantic SST gradient and the influence of ENSO, Geophys. Res. Lett., 32, L20706, doi:10.1029/2005GL023944.

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