DOI: 10.1175/JCLI-D-16-0465.1
Scopus记录号: 2-s2.0-85021084870
论文题名: Defining sudden stratospheric warming in climate models: Accounting for biases in model climatologies
作者: Kim J. ; Son S.-W. ; Gerber E.P. ; Park H.-S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 14 起始页码: 5529
结束页码: 5546
语种: 英语
Scopus关键词: Troposphere
; Upper atmosphere
; Vortex flow
; Coupled Model Intercomparison Project
; Linear relationships
; Model climatology
; Stratosphere-troposphere coupling
; Sudden stratospheric warming
; Warm climates
; Wave activity
; Zonal-mean zonal winds
; Climate models
英文摘要: A sudden stratospheric warming (SSW) is often defined as zonal-mean zonal wind reversal at 10 hPa and 60°N. This simple definition has been applied not only to the reanalysis data but also to climate model output. In the present study, it is shown that the application of this definition to models can be significantly influenced by model mean biases (i.e., more frequent SSWs appear to occur in models with a weaker climatological polar vortex). To overcome this deficiency, a tendency-based definition is proposed and applied to the multimodel datasets archived for phase 5 of the Coupled Model Intercomparison Project (CMIP5). In this definition, SSW-like events are defined by sufficiently strong vortex deceleration. This approach removes a linear relationship between SSW frequency and intensity of the climatological polar vortex in the CMIP5 models. The models' SSW frequency instead becomes significantly correlated with the climatological upward wave flux at 100 hPa, a measure of interaction between the troposphere and stratosphere. Lower stratospheric wave activity and downward propagation of stratospheric anomalies to the troposphere are also reasonably well captured. However, in both definitions, the high-top models generally exhibit more frequent SSWs than the low-top models. Moreover, a hint of more frequent SSWs in a warm climate is found in both definitions. © 2017 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48835
Appears in Collections: 气候减缓与适应 气候变化与战略
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作者单位: Advanced Modeling Infrastructure Team, Numerical Modeling Center, Seoul National University, Seoul, South Korea; School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea; Courant Institute of Mathematical Sciences, New York University, New York, NY, United States; Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea; Advanced Modeling Infrastructure Team, Numerical Modeling Center, Seoul, South Korea
Recommended Citation:
Kim J.,Son S.-W.,Gerber E.P.,et al. Defining sudden stratospheric warming in climate models: Accounting for biases in model climatologies[J]. Journal of Climate,2017-01-01,30(14)