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AGU: Geophysical Research Letters

 

Index Terms

  • Biogeosciences: Climate dynamics
  • Atmospheric Processes: Ocean/atmosphere interactions
  • Oceanography: General: Climate and interannual variability
  • Oceanography: General: Equatorial oceanography
  • Oceanography: Physical: Air/sea interactions

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L21712, 4 PP., 2005
doi:10.1029/2005GL024222

Coupled ocean-atmosphere response to north tropical Atlantic SST: Tropical Atlantic dipole and ENSO

Lixin Wu

Physical Oceanography Laboratory, Ocean University of China, Qingdao, China

Center for Climatic Research, University of Wisconsin-Madison, Madison, Wisconsin, USA

Feng He

Center for Climatic Research, University of Wisconsin-Madison, Madison, Wisconsin, USA

Zhengyu Liu

Center for Climatic Research, University of Wisconsin-Madison, Madison, Wisconsin, USA

The coupled ocean-atmosphere response to changes of the north tropical Atlantic (NTA) SST is investigated using a coupled ocean-atmosphere general circulation model. The model explicitly demonstrates that a NTA SST anomaly can organize an inter-hemispheric SST dipole in boreal spring over both the tropical Atlantic and eastern tropical Pacific primarily through a coupled wind-evaporative-SST (WES) feedback. While the tropical Atlantic dipole eventually decays in summer and fall, the eastern tropical Pacific dipole subsequently evolves into an ENSO-like pattern through the seasonal migration of the ITCZ and coupled ocean-atmosphere feedbacks.

Received 27 July 2005; accepted 7 October 2005; published 8 November 2005.

Citation: Wu, L., F. He, and Z. Liu (2005), Coupled ocean-atmosphere response to north tropical Atlantic SST: Tropical Atlantic dipole and ENSO, Geophys. Res. Lett., 32, L21712, doi:10.1029/2005GL024222.

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