DOI: 10.1002/2016MS000843
Scopus记录号: 2-s2.0-85011268676
论文题名: Climate change and the Madden-Julian Oscillation: A vertically resolved weak temperature gradient analysis
作者: Wolding B ; O ; , Maloney E ; D ; , Henderson S ; , Branson M
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 1 起始页码: 307
结束页码: 331
语种: 英语
英文关键词: Carbon dioxide
; Climate change
; Moisture
; Temperature
; Thermal gradients
; Tropics
; Convective heating
; Dynamical response
; Geopotential height anomalies
; Madden-Julian oscillation
; Moisture advection
; Northern Hemispheres
; Teleconnections
; Thermodynamic structures
; Climatology
; adiabatic process
; atmospheric convection
; carbon dioxide
; climate change
; gradient analysis
; Madden-Julian oscillation
; moisture content
; teleconnection
; temperature gradient
; thermodynamics
英文摘要: WTG balance is used to examine how changes in the moist thermodynamic structure of the tropics affect the MJO in two simulations of the Superparameterized Community Earth System Model (SP-CESM), one at preindustrial (PI) levels of CO2 and one where CO2 levels have been quadrupled (4×CO2). While MJO convective variability increases considerably in the 4×CO2 simulation, the dynamical response to this convective variability decreases. Increased MJO convective variability is shown to be a robust response to the steepening vertical moisture gradient, consistent with the findings of previous studies. The steepened vertical moisture gradient allows MJO convective heating to drive stronger variations in large-scale vertical moisture advection, supporting destabilization of the MJO. The decreased dynamical response to MJO convective variability is shown to be a consequence of increased static stability, which allows weaker variations in large-scale vertical velocity to produce sufficient adiabatic cooling to balance variations in MJO convective heating. This weakened dynamical response results in a considerable reduction of the MJO's ability to influence the extratropics, which is closely tied to the strength of its associated divergence. A composite lifecycle of the MJO was used to show that northern hemisphere extratropical 525 hPa geopotential height anomalies decreased by 27% in the 4×CO2 simulation, despite a 22% increase in tropical convective heating associated with the MJO. Results of this study suggest that while MJO convective variability may increase in a warming climate, the MJO's role in “bridging weather and climate” in the extratropics may not. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75833
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Wolding B,O,, Maloney E,et al. Climate change and the Madden-Julian Oscillation: A vertically resolved weak temperature gradient analysis[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(1)