GSTDTAP  > 气候变化
DOI10.1175/JCLI-D-16-0441.1
La Nina-like Mean-State Response to Global Warming and Potential Oceanic Roles
Kohyama, Tsubasa; Hartmann, Dennis L.; Battisti, David S.
2017-06-01
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2017
卷号30期号:11
文章类型Article
语种英语
国家USA
英文摘要

The majority of the models that participated in phase 5 of the Coupled Model Intercomparison Project global warming experiments warm faster in the eastern equatorial Pacific Ocean than in the west. GFDL-ESM2M is an exception among the state-of-the-art global climate models in that the equatorial Pacific sea surface temperature (SST) in the west warms faster than in the east, and the Walker circulation strengthens in response to warming. This study shows that this ''La Nina-like'' trend simulated by GFDL-ESM2M could be a physically consistent response to warming, and that the forced response could have been detectable since the late twentieth century. Two additional models are examined: GFDL-ESM2G, which differs from GFDL-ESM2M only in the oceanic components, warms without a clear zonal SST gradient; and HadGEM2-CC exhibits a warming pattern that resembles the multimodel mean. Afundamental observed constraint between the amplitude of El Nino-Southern Oscillation (ENSO) and the mean-state zonal SST gradient is reproduced well by GFDL-ESM2M but not by the other two models, which display substantially weaker ENSO nonlinearity than is observed. Under this constraint, the weakening nonlinear ENSO amplitude in GFDLESM2M rectifies the mean state to be La Nina-like. GFDL-ESM2M exhibits more realistic equatorial thermal stratification than GFDL-ESM2G, which appears to be the most important difference for the ENSO nonlinearity. On longer time scales, the weaker polar amplification in GFDL-ESM2M may also explain the origin of the colder equatorial upwelling water, which could in turn weaken the ENSO amplitude.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000401007500016
WOS关键词TROPICAL PACIFIC CLIMATE ; EQUATORIAL PACIFIC ; PART I ; CMIP5 ; PATTERN ; CIRCULATION ; ASYMMETRY ; WALKER ; MODEL ; UNCERTAINTY
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/19378
专题气候变化
作者单位Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA
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Kohyama, Tsubasa,Hartmann, Dennis L.,Battisti, David S.. La Nina-like Mean-State Response to Global Warming and Potential Oceanic Roles[J]. JOURNAL OF CLIMATE,2017,30(11).
APA Kohyama, Tsubasa,Hartmann, Dennis L.,&Battisti, David S..(2017).La Nina-like Mean-State Response to Global Warming and Potential Oceanic Roles.JOURNAL OF CLIMATE,30(11).
MLA Kohyama, Tsubasa,et al."La Nina-like Mean-State Response to Global Warming and Potential Oceanic Roles".JOURNAL OF CLIMATE 30.11(2017).
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