DOI: 10.1175/JCLI-D-15-0374.1
Scopus记录号: 2-s2.0-84964908027
论文题名: The role of the dry static stability for the recent change in the Pacific Walker circulation
作者: Sohn B.-J. ; Lee S. ; Chung E.-S. ; Song H.-J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 8 起始页码: 2765
结束页码: 2779
语种: 英语
Scopus关键词: Atmospheric temperature
; Climatology
; Dynamics
; Greenhouse gases
; Heat convection
; Oceanography
; Stability
; Stabilization
; Surface waters
; Tropics
; Atmospheric model
; Coupled Model Intercomparison Project
; ENSO
; Greenhouse gas (GHG)
; Lower boundary conditions
; Sea surface temperature (SST)
; Tropical convection
; Walker circulation
; Climate models
; atmospheric convection
; atmospheric modeling
; climate modeling
; climate prediction
; El Nino-Southern Oscillation
; greenhouse gas
; sea surface temperature
; temperature gradient
; Walker circulation
; Pomatiopsis californica
英文摘要: There is an uncertainty in how the Pacific Walker circulation (PWC) will change in response to increased greenhouse gas (GHG) warming. On average, climate models predict that the PWC will weaken. Observational evidence is mixed, with some evidence supporting the models while others do not. In this study, insight into the PWC trend is provided by examining the tropical dry static stability, a quantity that is inversely proportional to the strength of the PWC. For the 1979-2012 period, the static stability increased markedly in all phase 5 of the Coupled Model Intercomparison Project (CMIP5) models, far more so than in the satellite and global reanalysis data, which show a strengthening of the PWC. The stabilization is greater for a subset of models that simulate a significant weakening of the PWC. With the observed sea surface temperature as the lower boundary condition, over the western tropical Pacific, atmospheric models that belong to the weakening-PWC-CMIP5 group produce greater stabilization than those that belong to the strengthening-PWC-CMIP5 group. Compared with the latter group, the former group of atmospheric models simulates weaker trade winds over the western and central tropical Pacific and, consistent with the Bjerknes mechanism, the corresponding CMIP5 models produce a weaker west-east gradient in tropical SST. Given that the models' convective parameterizations overstabilize the atmosphere compared with an explicit convection, the findings here suggest that the models' representations of tropical convection and stability contribute to the models' tendency to simulate a weakening of the PWC and an El Niño-like SST. © 2016 American Meteorological Society. 资助项目: MSU, Maharaja Sayajirao University of Baroda
; Seoul National University
; UH, University of Hamburg
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49980
Appears in Collections: 气候变化事实与影响
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作者单位: School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea; Department of Meteorology, The Pennsylvania State University, University Park, PA, United States; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States
Recommended Citation:
Sohn B.-J.,Lee S.,Chung E.-S.,et al. The role of the dry static stability for the recent change in the Pacific Walker circulation[J]. Journal of Climate,2016-01-01,29(8)