Role of tropical atlantic sst variability as a modulator of el Niño teleconnections

Yoo Geun Ham, Mi Kyung Sung, Soon Il An, Siegfried D. Schubert, Jong Seong Kug

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The present study suggests that the off-equatorial North Atlantic (NATL) SST warming plays a significant role in modulating El Niño teleconnection and its impact on the North Atlantic and European regions. The El Niño events accompanied by NATL SST warming exhibit south-north dipole pattern over the Western Europe to Atlantic, while the ENSO teleconnection pattern without NATL warming exhibits a Rossby wave-like pattern confined over the North Pacific and western Atlantic. Especially, the El Niño events with NATL warming show positive (negative) geopotential-height anomalies over the North Atlantic (Western Europe) which resemble the negative phase of the NAO. Consistently, it is shown using a simple statistical model that NATL SSTA in addition to the tropical Pacific SSTA leads to better prediction on regional climate variation over the North Atlantic and European regions. This role of NATL SST on ENSO teleconnection is also validated and discussed in a long term simulation of coupled global circulation model (CGCM).

Original languageEnglish
Pages (from-to)247-261
Number of pages15
JournalAsia-Pacific Journal of Atmospheric Sciences
Volume50
Issue number3
DOIs
Publication statusPublished - 2014 May

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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