DOI: 10.1007/s00382-017-3750-6
Scopus记录号: 2-s2.0-85020668018
论文题名: Dynamical and thermodynamical coupling between the North Atlantic subtropical high and the marine boundary layer clouds in boreal summer
作者: Wei W. ; Li W. ; Deng Y. ; Yang S. ; Jiang J.H. ; Huang L. ; Liu W.T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-07-08 起始页码: 2457
结束页码: 2469
语种: 英语
英文关键词: Dynamical and thermodynamical coupling processes
; Marine boundary layer clouds
; North Atlantic subtropical high
; Sea surface temperatures
Scopus关键词: boundary layer
; climate variation
; cloud cover
; cooling
; coupling
; diabatic process
; marine atmosphere
; sea surface temperature
; summer
; thermodynamics
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: This study investigates dynamical and thermodynamical coupling between the North Atlantic subtropical high (NASH), marine boundary layer (MBL) clouds, and the local sea surface temperatures (SSTs) over the North Atlantic in boreal summer for 1984–2009 using NCEP/DOE Reanalysis 2 dataset, various cloud data, and the Hadley Centre sea surface temperature. On interannual timescales, the summer mean subtropical MBL clouds to the southeast of the NASH is actively coupled with the NASH and local SSTs: a stronger (weaker) NASH is often accompanied with an increase (a decrease) of MBL clouds and abnormally cooler (warmer) SSTs along the southeast flank of the NASH. To understand the physical processes between the NASH and the MBL clouds, the authors conduct a data diagnostic analysis and implement a numerical modeling investigation using an idealized anomalous atmospheric general circulation model (AGCM). Results suggest that significant northeasterly anomalies in the southeast flank of the NASH associated with an intensified NASH tend to induce stronger cold advection and coastal upwelling in the MBL cloud region, reducing the boundary surface temperature. Meanwhile, warm advection associated with the easterly anomalies from the African continent leads to warming over the MBL cloud region at 700 hPa. Such warming and the surface cooling increase the atmospheric static stability, favoring growth of the MBL clouds. The anomalous diabatic cooling associated with the growth of the MBL clouds dynamically excites an anomalous anticyclone to its north and contributes to strengthening of the NASH circulation in its southeast flank. The dynamical and thermodynamical couplings and their associated variations in the NASH, MBL clouds, and SSTs constitute an important aspect of the summer climate variability over the North Atlantic. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109369
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China; Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, Durham, NC 27708-0328, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, China
Recommended Citation:
Wei W.,Li W.,Deng Y.,et al. Dynamical and thermodynamical coupling between the North Atlantic subtropical high and the marine boundary layer clouds in boreal summer[J]. Climate Dynamics,2018-01-01,50(2018-07-08)