Climate Dynamics

, Volume 49, Issue 7–8, pp 2649–2664 | Cite as

Tropical Atlantic-Korea teleconnection pattern during boreal summer season

  • Yoo-Geun Ham
  • Yoshimitsu Chikamoto
  • Jong-Seong Kug
  • Masahide Kimoto
  • Takashi Mochizuki
Article

Abstract

The remote impact of tropical Atlantic sea surface temperature (SST) variability on Korean summer precipitation is examined based on observational data analysis along with the idealized and hindcast model experiments. Observations show a significant correlation (i.e. 0.64) between Korean precipitation anomalies (averaged over 120–130°E, 35–40°N) and the tropical Atlantic SST index (averaged over 60°W–20°E, 30°S–30°N) during the June–July–August (JJA) season for the 1979–2010 period. Our observational analysis and partial-data assimilation experiments using the coupled general circulation model demonstrate that tropical Atlantic SST warming induces the equatorial low-level easterly over the western Pacific through a reorganization of the global Walker Circulation, causing a decreased precipitation over the off-equatorial western Pacific. As a Gill-type response to this diabatic forcing, an anomalous low-level anticyclonic circulation appears over the Philippine Sea, which transports wet air from the tropics to East Asia through low-level southerly, resulting an enhanced precipitation in the Korean peninsula. Multi-model hindcast experiments also show that predictive skills of Korean summer precipitation are improved by utilizing predictions of tropical Atlantic SST anomalies as a predictor for Korean precipitation anomalies.

Keywords

Tropical Atlantic warming Precipitation over the Korean peninsula Atmospheric teleconnection 

Notes

Acknowledgements

This work is supported by the Korean Meteorological Administration Research and Development Program under Grant KMIPA2015-6170. The partial assimilation experiments were performed with the support of the Japanese Ministry of Education, Culture, Sports, Science and Technology, through the Program for Risk Information on Climate Change. Y.C. was supported through NSF Award No. 1049219.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Faculty of Earth Systems and Environmental SciencesChonnam National UniversityGwangjuRepublic of Korea
  2. 2.International Pacific Research CenterUniversity of Hawaii at ManoaHonoluluUSA
  3. 3.School of Earth Science and EngineeringPohang University of Science and TechnologyPohangSouth Korea
  4. 4.Atmosphere and Ocean Research InstituteUniversity of TokyoKashiwaJapan
  5. 5.Japan Agency for Marine-Earth Science and TechnologyYokohamaJapan

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