Climate Dynamics

, Volume 43, Issue 7–8, pp 2197–2205 | Cite as

Locally and remotely forced atmospheric circulation anomalies of Ningaloo Niño/Niña

Article

Abstract

A recently identified climate mode called Ningaloo Niño (Niña) is associated with positive (negative) sea surface temperature (SST) anomalies off the west coast of Australia and negative (positive) sea level pressure (SLP) anomalies in the overlying atmosphere. By conducting a series of numerical experiments with an atmospheric general circulation model, generation mechanisms of the atmospheric circulation anomalies accompanied by Ningaloo Niño/Niña are examined. Even when SST is allowed to vary interannually only in the eastern South Indian Ocean, negative (positive) SLP anomalies are formed off the west coast of Australia in Ningaloo Niño (Niña) years, supporting the existence of local ocean–atmosphere interaction. When the model is forced by SST anomalies outside of the eastern South Indian Ocean, negative (positive) SLP anomalies are also generated in Ningaloo Niño (Niña) years owing to a Matsuno–Gill type response to atmospheric convection anomalies in the tropical Pacific. It is found that the latter impact is stronger in the current atmospheric general circulation model. Regarding climatic impacts, it is shown that Ningaloo Niño (Niña) induces wet (dry) anomalies over the northwestern part of Australia even when SST anomalies outside of the eastern South Indian Ocean are excluded from the SST forcing.

Keywords

Ningaloo Niño/Niña Interannual variation Southeastern Indian Ocean Atmospheric general circulation model 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Tomoki Tozuka
    • 1
  • Takahito Kataoka
    • 1
  • Toshio Yamagata
    • 2
  1. 1.Department of Earth and Planetary Science, Graduate School of ScienceThe University of TokyoBunkyo-kuJapan
  2. 2.Application LaboratoryJAMSTECYokohamaJapan

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