How well do current climate models simulate two types of El Nino? SCIE SCOPUS

Cited 114 time in WEB OF SCIENCE Cited 118 time in Scopus
Title
How well do current climate models simulate two types of El Nino?
Author(s)
Ham, Yoo-Geun; Kug, Jong-Seong
Publication Year
2012-07
Abstract
In this study, we evaluate the fidelity of current climate models in simulating the two types of El Nino events using the pre-industrial output in CMIP3 archives. It is shown that a few climate models simulate the two types of El Nino events to some extent, while most of the models have serious systematic problems in simulating distinctive patterns of sea-surface temperature (SST) and precipitation anomaly associated with the two types of El Nino; that is, they tend to simulate a single type of El Nino. It is shown that the ability of climate models in simulating the two types of El Nino is related to the sensitivity of the atmospheric responses to the SST anomaly patterns. Models whose convective location is shifted to the east (west) as the SST anomaly center moves to the east (west) tends to simulate the two types of El Nino events successfully. On the other hand, models whose location of convective anomaly is confined over the western or central Pacific tends to simulate only the single type of El Nino event. It is also shown that the confinement of the convective anomaly over the western or central Pacific is closely linked to the dry bias and the associated cold bias over the eastern Pacific. That is, because positive El Nino SST anomalies over the eastern Pacific cannot increase local convection effectively when the total SSTs are still too cold due to a cold bias. This implies that the realistic simulation of climatology, especially over the equatorial eastern Pacific, is essential to the successful simulation of the two types of El Nino.
ISSN
0930-7575
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3573
DOI
10.1007/s00382-011-1157-3
Bibliographic Citation
CLIMATE DYNAMICS, v.39, no.1-2, pp.383 - 398, 2012
Publisher
SPRINGER
Subject
ATMOSPHERE FEEDBACKS; WARM POOL; PACIFIC; ENSO; EVENTS; TEMPERATURE; ANOMALIES; IMPACT
Keywords
Two types of El Nino; ENSO; Climate model
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGER
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