Different ENSO Teleconnections over East Asia in Early and Late Winter: Role of Precipitation Anomalies in the Tropical Indian Ocean and Far Western Pacific

Tianjiao Ma, Wen Chen*, Shangfeng Chen, Chaim I. Garfinkel, Shuoyi Ding, Lei Song, Zhibo Li, Yulian Tang, Jingliang Huangfu, Hainan Gong, Wei Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

This study aims to better understand the ENSO impacts on climate anomalies over East Asia in early winter (November-December) and late winter (January-February). In particular, the possible mechanisms during early winter are investigated. The results show that ENSO is associated with a Rossby wave train emanating from the tropical Indian Ocean toward East Asia (denoted as tIO-EA) in early winter. This tIO-EA wave train in El Niño (La Niña) is closely related to a weakening (strengthening) of the East Asian trough, and thereby a weakened (strengthened) East Asian winter monsoon and warm (cold) temperature anomalies over northeastern China and Japan. By using partial regression analysis and numerical experiments, we identify that the formation of tIO-EA wave train is closely related to precipitation anomalies in the tropical eastern Indian Ocean and western Pacific (denoted as eIO/wP). In addition, the ENSO-induced North Atlantic anomalies may also contribute to formation of the tIO-EA wave train in conjunction with the eIO/wP precipitation. The response of eIO/wP precipitation to ENSO is stronger in early winter than in late winter. This can be attributed to the stronger anomalous Walker circulation over the Indian Ocean, which in turn is caused by higher climatological SST and stronger mean precipitation state in the Indian Ocean during early winter.

Original languageAmerican English
Pages (from-to)4319-4335
Number of pages17
JournalJournal of Climate
Volume35
Issue number24
DOIs
StatePublished - 15 Dec 2022

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Keywords

  • ENSO
  • Indian Ocean
  • Monsoons
  • Teleconnections

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