Can the Southern annular mode influence the Korean summer monsoon rainfall?

  • Amita Prabhu
  • Ramesh KripalaniEmail author
  • Jaiho Oh
  • Bhaskar Preethi


We demonstrate that a large-scale longitudinally symmetric global phenomenon in the Southern Hemisphere sub-polar region can transmit its influence over a remote local region of the Northern Hemisphere traveling more than 100° of latitudes (from ~70°S to ~40°N). This is illustrated by examining the relationship between the Southern Annular Mode (SAM) and the Korean Monsoon Rainfall (KMR) based on the data period 1983-2013. Results reveal that the May-June SAM (MJSAM) has a significant in-phase relationship with the subsequent KMR. A positive MJSAM is favorable for the summer monsoon rainfall over the Korean peninsula. The impact is relayed through the central Pacific Ocean. When a negative phase of MJSAM occurs, it gives rise to an anomalous meridional circulation in a longitudinally locked air-sea coupled system over the central Pacific that propagates from sub-polar to equatorial latitudes and is associated with the central Pacific warming. The ascending motion over the central Pacific descends over the Korean peninsula during peak-boreal summer resulting in weakening of monsoon rainfall. The opposite features prevail during a positive phase of SAM. Thus, the extreme modes of MJSAM could possibly serve as a predictor for ensuing Korean summer monsoon rainfall.

Key words

Southern annular mode Central Pacific warming Korean monsoon rainfall 


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Copyright information

© Korean Meteorological Society and Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Amita Prabhu
    • 1
    • 2
  • Ramesh Kripalani
    • 2
    • 3
    • 4
    Email author
  • Jaiho Oh
    • 1
  • Bhaskar Preethi
    • 2
  1. 1.Department of Environmental and Atmospheric SciencesPukyong National UniversityBusanKorea
  2. 2.Indian Institute of Tropical MeteorologyPuneIndia
  3. 3.International CLIVAR Monsoon Project OfficeIITMPuneIndia
  4. 4.International CLIVAR Monsoon Project OfficeIITMPashan, PuneIndia

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