Source of low frequency modulation of ENSO amplitude in a CGCM SCIE SCOPUS

Cited 3 time in WEB OF SCIENCE Cited 4 time in Scopus
Title
Source of low frequency modulation of ENSO amplitude in a CGCM
Author(s)
Moon, Byung-Kwon; Yeh, Sang-Wook; Dewitte, Boris; Jhun, Jong-Ghap; Kang, In-Sik
Publication Year
2007-07
Abstract
We study the relationship between changes in equatorial stratification and low frequency El Nino/ Southern Oscillation ( ENSO) amplitude modulation in a coupled general circulation model (CGCM) that uses an anomaly coupling strategy to prevent climate drifts in the mean state. The stratification is intensified at upper levels in the western and central equatorial Pacific during periods of high ENSO amplitude. Furthermore, changes in equatorial stratification are connected with subsurface temperature anomalies originating from the central south tropical Pacific. The correlation analysis of ocean temperature anomalies against an index for the ENSO modulation supports the hypothesis of the existence of an oceanic "tunnel'' that connects the south tropical Pacific to the equatorial wave guide. Further analysis of the wind stress projection coefficient onto the oceanic baroclinic modes suggests that the low frequency modulation of ENSO amplitude is associated with a significant contribution of higher-order modes in the western and central equatorial Pacific. In the light of these results, we suggest that, in the CGCM, change in the baroclinic mode energy distribution associated with low frequency ENSO amplitude modulation have its source in the central south tropical Pacific.
ISSN
0930-7575
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4678
DOI
10.1007/s00382-006-0219-4
Bibliographic Citation
CLIMATE DYNAMICS, v.29, no.1, pp.101 - 111, 2007
Publisher
SPRINGER
Subject
NINO-SOUTHERN OSCILLATION; EL-NINO; DECADAL VARIABILITY; TROPICAL PACIFIC; INTERDECADAL CHANGES; COUPLED MODEL; NORTH PACIFIC; OCEAN; PREDICTABILITY; SPICINESS
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGER
Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse