eCite Digital Repository

Transmission of ENSO signal to the Indian Ocean


Cai, W and Meyers, GA and Shi, G, Transmission of ENSO signal to the Indian Ocean, Geophysical Research Letters, 32, (1) pp. L05616. ISSN 0094-8276 (2005) [Refereed Article]

DOI: doi:10.1029/2004GL021736


The dynamics of El Niño-Southern Oscillation (ENSO) cycles has previously been interpreted in terms of discharge and recharge of mass and heat in the equatorial Pacific. Some of the ENSO discharge/recharge signals transmit into the Indian Ocean, but the pathway is yet to be fully established. This study reveals a previously un-noticed subtropical North Pacific (NP) pathway. NP Rossby waves associated with ENSO impinge on the western boundary and move equatorward along the "ray-path" of Kelvin-Munk waves, and reflect as equatorial Kelvin waves. En-route to the equator, the waves are reinforced by wind stress anomalies associated with ENSO. The reflected equatorial Kelvin waves impinge on the Australasian continent and move poleward along the northern western Australia (WA) coast as coastally-trapped waves, radiating Rossby waves into the south Indian Ocean. In this way, some 55% of the total interannual variance of the WA thermocline is linked to the subtropical NP Rossby waves. Copyright 2005 by the American Geophysical Union.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Adaptation to climate change
Objective Field:Social impacts of climate change and variability
UTAS Author:Meyers, GA (Professor Gary Meyers)
ID Code:45990
Year Published:2005
Web of Science® Times Cited:57
Deposited By:Centre for Marine Science
Deposited On:2007-08-01
Last Modified:2009-04-03

Repository Staff Only: item control page