TITLE

An idealized study of the impact of extratropical climate change on El Niño—Southern Oscillation

AUTHOR(S)
Qiong Zhang; Haijun Yang; Yafang Zhong; Dongxiao Wang
PUB. DATE
December 2005
SOURCE
Climate Dynamics;Dec2005, Vol. 25 Issue 7/8, p869
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Extratropical impacts on the tropical El Niño–Southern Oscillation (ENSO) are studied in a coupled climate model. Idealized experiments show that the remote impact of the extratropics on the equatorial thermocline through oceanic tunnel can substantially modulate the ENSO in both magnitude and frequency. First of all, an extratropical warming can be conveyed to the equator by the mean subduction current, resulting in a warming of the equatorial thermocline. Second, the extratropical warming can weaken the Hadley cells, which in turn slow down the mean shallow meridional overturning circulations in the upper Pacific, reducing the equatorward cold water supply and the equatorial upwelling. These oceanic dynamic processes would weaken the stratification of the equatorial thermocline and retard a buildup (purge) of excess heat content along the equator, and finally result in a weaker and longer ENSO cycle. This study highlights a nonlocal mechanism in which ENSO behavior is related to the extratropical climate conditions.
ACCESSION #
18813681

 

Related Articles

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics