Dynamics of monsoon‐induced biennial variability in ENSO

Dynamics of monsoon‐induced biennial variability in ENSO The mechanism of the quasi‐biennial tendency in ENSO‐monsoon coupled system is investigated using an intermediate coupled model. The monsoon wind forcing is prescribed as a function of SST anomalies based on the relationship between zonal wind anomalies over the western Pacific to sea level change in the equatorial eastern Pacific. The key mechanism of quasi‐biennial tendency in El Niño evolution is found to be in the strong coupling of ENSO to monsoon wind forcing over the western Pacific. Strong boreal summer monsoon wind forcing, which lags the maximum SST anomaly in the equatorial eastern Pacific approximately 6 months, tends to generate Kelvin waves of the opposite sign to anomalies in the eastern Pacific and initiates the turnabout in the eastern Pacific. Boreal winter monsoon forcing, which has zero lag with maximum SST in the equatorial eastern Pacific, tends to damp the ENSO oscillations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Dynamics of monsoon‐induced biennial variability in ENSO

Geophysical Research Letters, Volume 28 (2) – Jan 15, 2001

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Publisher
Wiley
Copyright
Copyright © 2001 by the American Geophysical Union.
ISSN
0094-8276
eISSN
1944-8007
D.O.I.
10.1029/2000GL012465
Publisher site
See Article on Publisher Site

Abstract

The mechanism of the quasi‐biennial tendency in ENSO‐monsoon coupled system is investigated using an intermediate coupled model. The monsoon wind forcing is prescribed as a function of SST anomalies based on the relationship between zonal wind anomalies over the western Pacific to sea level change in the equatorial eastern Pacific. The key mechanism of quasi‐biennial tendency in El Niño evolution is found to be in the strong coupling of ENSO to monsoon wind forcing over the western Pacific. Strong boreal summer monsoon wind forcing, which lags the maximum SST anomaly in the equatorial eastern Pacific approximately 6 months, tends to generate Kelvin waves of the opposite sign to anomalies in the eastern Pacific and initiates the turnabout in the eastern Pacific. Boreal winter monsoon forcing, which has zero lag with maximum SST in the equatorial eastern Pacific, tends to damp the ENSO oscillations.

Journal

Geophysical Research LettersWiley

Published: Jan 15, 2001

References

  • A theory for the tropospheric biennial oscillation
    Chang, Chang; Li, Li
  • Asian summer monsoon‐ENSO feedback on the Cane‐Zebiak model ENSO
    Chung, Chung; Nigam, Nigam
  • The south Asian monsoon and the tropospheric biennial oscillation
    Meehl, Meehl
  • Slow variability in the equatorial west‐central Pacific in relation to ENSO
    Weisberg, Weisberg; Wang, Wang

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