alexa On the weakening relationship between the indian monsoon and ENSO
Geology & Earth Science

Geology & Earth Science

Journal of Earth Science & Climatic Change

Author(s): Kumar KK, Rajagopalan B, Cane MA

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Abstract Analysis of the 140-year historical record suggests that the inverse relationship between the El Nino-Southern Oscillation (ENSO) and the Indian summer monsoon (weak monsoon arising from warm ENSO event) has broken down in recent decades. Two possible reasons emerge from the analyses. A southeastward shift in the Walker circulation anomalies associated with ENSO events may lead to a reduced subsidence over the Indian region, thus favoring normal monsoon conditions. Additionally, increased surface temperatures over Eurasia in winter and spring, which are a part of the midlatitude continental warming trend, may favor the enhanced land-ocean thermal gradient conducive to a strong monsoon. These observations raise the possibility that the Eurasian warming in recent decades helps to sustain the monsoon rainfall at a normal level despite strong ENSO events.
This article was published in Science and referenced in Journal of Earth Science & Climatic Change

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