DOI: 10.1175/JCLI-D-13-00569.1
Scopus记录号: 2-s2.0-84904497817
论文题名: Modulation of marine low clouds associated with the tropical intraseasonal variability over the eastern Pacific
作者: Jiang X. ; Kubar T.L. ; Wong S. ; Olson W.S. ; Waliser D.E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 14 起始页码: 5560
结束页码: 5574
语种: 英语
Scopus关键词: Tropics
; Wind effects
; Future climate projections
; Intertropical convergence zone
; Intraseasonal time scale
; Intraseasonal variability
; Satellite observations
; Surface latent heat fluxes
; Tropical intraseasonal variability
; Tropical variability
; Climate change
; accuracy assessment
; climate modeling
; cloud cover
; cloud microphysics
; energy balance
; intertropical convergence zone
; marine atmosphere
; observational method
; seasonal variation
; warm pool
; Pacific Ocean
; Pacific Ocean (East)
; Pacific Ocean (North)
; Pacific Ocean (Southeast)
英文摘要: Owing to its profound influences on global energy balance, accurate representation of low cloud variability in climatemodels is an urgent need for future climate projection. In the present study, marine lowcloud variability on intraseasonal time scales is characterized, with a particular focus over the Pacific basin during boreal summer and its association with the dominant mode of tropical intraseasonal variability (TISV) over the eastern Pacific (EPAC) intertropical convergence zone (ITCZ). Analyses indicate that, when anomalous TISV convection is enhanced over the elongatedEPACITCZ, reduction of low cloud fraction (LCF) is evident over a vast area of the central North Pacific. Subsequently, when the enhanced TISV convection migrates to the northern part of the EPAC warm pool, a ''comma shaped'' pattern of reduced LCF prevails over the subtropical North Pacific, along with a pronounced reduction of LCF present over the southeast Pacific (SEPAC). Further analyses indicate that surface latent heat fluxes and boundary heights induced by anomalous low-level circulation through temperature advection and changes of total wind speed, as well as midlevel vertical velocity associated with the EPAC TISV, could be the most prominent factors in regulating the intraseasonal variability of LCF over the North Pacific. For the SEPAC, temperature anomalies at the top of the boundary inversion layer between 850 and 800 hPa play a critical role in the local LCFintraseasonal variations. Results presented in this study provide not only improved understanding of variability of marine low clouds and the underlying physics, but also a prominent benchmark in constraining and evaluating the representation of low clouds in climate models. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50997
Appears in Collections: 气候变化事实与影响
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作者单位: Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Colorado State University, Fort Collins, CO, United States; Joint Center for Earth Systems Technology, University of Maryland, Baltimore County, Baltimore, MD, United States
Recommended Citation:
Jiang X.,Kubar T.L.,Wong S.,et al. Modulation of marine low clouds associated with the tropical intraseasonal variability over the eastern Pacific[J]. Journal of Climate,2014-01-01,27(14)