Interdecadal Changes in the Major Modes of Asian–Australian Monsoon Variability: Strengthening Relationship with ENSO since the Late 1970s*

Bin Wang; Jing Yang; Tianjun Zhou

doi:10.1175/2007jcli1981.1

journal article Apr 15, 2008

Interdecadal Changes in the Major Modes of Asian–Australian Monsoon Variability: Strengthening Relationship with ENSO since the Late 1970s*

Bin Wang

Jing Yang

Tianjun Zhou

Journal of Climate Vol. 21 No. 8 pp. 1771-1789 · American Meteorological Society

View at Publisher Save 10.1175/2007jcli1981.1

Abstract

Abstract
The present paper develops an integral view of the year-to-year variability across the entire Asian–Australian monsoon (A–AM) system, which covers one-third of the global tropics between 40° and 160°E. Using season-reliant empirical orthogonal function (S-EOF) analysis, the authors identified two major modes of variability for the period 1956–2004. The first exhibits a prominent biennial tendency and concurs with the turnabout of El Niño–Southern Oscillation (ENSO), providing a new perspective of the seasonally evolving spatiotemporal structure for tropospheric biennial oscillation. The second mode leads ENSO by one year. The remote El Niño forcing, the monsoon–warm pool ocean interaction, and the influence of the annual cycle are three fundamental factors for understanding the behavior of the first mode. The monsoon–ocean interaction is characterized by a positive feedback between the off-equatorial convectively coupled Rossby waves and the underlying sea surface temperature (SST) “dipole” anomalies.
Since the late 1970s the overall coupling between the A–AM system and ENSO has become strengthened. The relationships between ENSO and the western North Pacific, East Asian, and Indonesian monsoons have all become enhanced during ENSO’s developing, mature, and decaying phases, overriding the weakening of the Indian monsoon–ENSO anticorrelation during the developing phase. Prior to the late 1970s (1956–79), the first mode shows a strong biennial tendency, and the second mode does not lead ENSO. After 1980, the first mode shows a weakening biennial tendency, and the second mode provides a strong precursory signal for ENSO. These interdecadal changes are attributed to increased magnitude and periodicity of ENSO and the strengthened monsoon–ocean interaction.

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Details

Published: Apr 15, 2008
Vol/Issue: 21(8)
Pages: 1771-1789

Authors

B

Bin Wang

Department of Meteorology, and International Pacific Research Center, University of Hawaii at Manoa, Honolulu, Hawaii

J

Jing Yang

Department of Meteorology, and International Pacific Research Center, University of Hawaii at Manoa, Honolulu, Hawaii, and LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

T

Tianjun Zhou

LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

Cite This Article

Bin Wang, Jing Yang, Tianjun Zhou (2008). Interdecadal Changes in the Major Modes of Asian–Australian Monsoon Variability: Strengthening Relationship with ENSO since the Late 1970s*. Journal of Climate, 21(8), 1771-1789. https://doi.org/10.1175/2007jcli1981.1

Interdecadal Changes in the Major Modes of Asian–Australian Monsoon Variability: Strengthening Relationship with ENSO since the Late 1970s*

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