4.2 Article

Weakening relationship between East Asian winter monsoon and ENSO after mid-1970s

Journal

CHINESE SCIENCE BULLETIN
Volume 57, Issue 27, Pages 3535-3540

Publisher

SCIENCE PRESS
DOI: 10.1007/s11434-012-5285-x

Keywords

East Asian winter monsoon; ENSO; interdecadal variability; interannual variability

Funding

  1. National Natural Science Foundation of China [41130103]
  2. National Basic Research Program of China [2009CB421406]

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The East Asian winter monsoon (EAWM) is characterized by the frequent cold surges and associated closely with the Siberia High, East Asian Trough, and high-level westerly jet stream. The ENSO cycle can modulate the EAWM since it has co-variability with the sea surface temperature over the Indo-Western-Pacific which can tune the land-sea thermal contrast for the EAWM. This paper, by analyzing the EAWM, ENSO, and associated atmosphere-ocean variability, documents the weakening of the EAWM-ENSO relationship after the 1970s. The significant out-of-phase inter-relationship is found to be diminished after the 1970s. Further study in this work suggests that the weakened co-variability of the tropical Indo-Western-Pacific climate associated with ENSO after the 1970s is partly responsible for the weakened inter-relationship. Meanwhile, the reduced EAWM interannual variability and northward retreat of the EAWM-associated climate variability are favorable to the weakened ENSO-EAWM connection.

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