Changes in mixed layer depth under climate change projections in two CGCMs SCIE SCOPUS

Cited 10 time in WEB OF SCIENCE Cited 11 time in Scopus
Title
Changes in mixed layer depth under climate change projections in two CGCMs
Author(s)
Yeh, Sang-Wook; Yim, Bo Young; Noh, Yign; Dewitte, Boris
Publication Year
2009-08
Abstract
Two coupled general circulation models, i.e., the Meteorological Research Institute (MRI) and Geophysical Fluid Dynamics Laboratory (GFDL) models, were chosen to examine changes in mixed layer depth (MLD) in the equatorial tropical Pacific and its relationship with ENSO under climate change projections. The control experiment used pre-industrial greenhouse gas concentrations whereas the 2 x CO2 experiment used doubled CO2 levels. In the control experiment, the MLD simulated in the MRI model was shallower than that in the GFDL model. This resulted in the tropical Pacific's mean sea surface temperature (SST) increasing at different rates under global warming in the two models. The deeper the mean MLD simulated in the control simulation, the lesser the warming rate of the mean SST simulated in the 2 x CO2 experiment. This demonstrates that the MLD is a key parameter for regulating the response of tropical mean SST to global warming. In particular, in the MRI model, increased stratification associated with global warming amplified wind-driven advection within the mixed layer, leading to greater ENSO variability. On the other hand, in the GFDL model, wind-driven currents were weak, which resulted in mixed-layer dynamics being less sensitive to global warming. The relationship between MLD and ENSO was also examined. Results indicated that the non-linearity between the MLD and ENSO is enhanced from the control run to the 2 x CO2 run in the MRI model, in contrast, the linear relationship between the MLD index and ENSO is unchanged despite an increase in CO2 concentrations in the GFDL model.
ISSN
0930-7575
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4276
DOI
10.1007/s00382-009-0530-y
Bibliographic Citation
CLIMATE DYNAMICS, v.33, no.2-3, pp.199 - 213, 2009
Publisher
SPRINGER
Subject
EQUATORIAL PACIFIC-OCEAN; SEASONAL CYCLE; NORTH PACIFIC; EL-NINO; BIOLOGICAL PRODUCTION; WIND STRESS; MEAN STATE; VARIABILITY; MODEL; ENSO
Keywords
Mixed layer depth; Climate change projections; CGCM; Sea surface temperature; ENSO
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGER
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