Possible effects of the North Atlantic Oscillation on the strengthening relationship between the East Asian Summer monsoon and ENSO

In contrast to the weakened relationship between the Indian summer monsoon and El Niño–Southern Oscillation (ENSO) since 1970s, the East Asian summer monsoon (EASM) has exhibited a strengthened relationship with ENSO. In this study, observational and numerical evidences manifest that spring NAO may...

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Published inInternational journal of climatology Vol. 32; no. 5; pp. 794 - 800
Main Authors Wu, Zhiwei, Li, Jianping, Jiang, Zhihong, He, Jinhai, Zhu, Xiaoying
Format Journal Article
LanguageEnglish
Published Chichester, UK John Wiley & Sons, Ltd 01.04.2012
Wiley
Subjects
Earth, ocean, space
ENSO
Exact sciences and technology
External geophysics
Meteorology
NAO
summer monsoon
Okhotsk Sea
West Pacific
Asia
Eurasia
Atlantic Ocean
Urals
Pacific Ocean
North Atlantic
India
Teleconnection
mountains
rainfall
atmospheric precipitation
ENSO
Summer
East Asia
Sea surface temperature
subtropical zone
anomalies
Summer monsoon
Rossby wave
North Atlantic oscillation
El Nino
Southern oscillation
Spring(season)
Wave train
Rainy season
NAO
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Summary:In contrast to the weakened relationship between the Indian summer monsoon and El Niño–Southern Oscillation (ENSO) since 1970s, the East Asian summer monsoon (EASM) has exhibited a strengthened relationship with ENSO. In this study, observational and numerical evidences manifest that spring NAO may exert notable impacts on the enhancement of the EASM–ENSO relationship. Anomalous spring NAO induces a tripole sea surface temperature anomaly (SSTA) pattern in North Atlantic which persists into ensuring summer. The tripole SSTA excites downstream tele‐connections of a distinct Rossby wave train prevailing over the northern Eurasia and a simple Gill‐Matsuno‐type quadrupole response over western Pacific. The former modulates the blocking highs over the Ural Mountain and the Okhotsk Sea. The latter enhances the linkage between the western Pacific subtropical high and ENSO. The co‐effects of the two tele‐connection patterns help to strengthen (or weaken) the subtropical Meiyu‐Baiu‐Changma front, the primary rain‐bearing system of the EASM. As such, spring NAO is tied to the strengthened connection between ENSO and the EASM. Copyright © 2011 Royal Meteorological Society
Bibliography:National Basic Research Program '973' of China - No. 2010CB950401
istex:9A47168006DB84174504D544CE951E2F39DA8791
ark:/67375/WNG-000HM48M-R
ArticleID:JOC2309
ISSN:0899-8418
1097-0088
DOI:10.1002/joc.2309