DOI: 10.1175/JCLI-D-16-0714.1
Scopus记录号: 2-s2.0-85017500926
论文题名: Atmospheric and oceanic origins of tropical precipitation variability
作者: He J. ; Deser C. ; Soden B.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 9 起始页码: 3197
结束页码: 3217
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Atmospheric thermodynamics
; Climate models
; Climatology
; Precipitation (meteorology)
; Rain
; Surface waters
; Thermodynamics
; Time measurement
; Tropics
; White noise
; Air sea interactions
; Atmosphere-ocean interactions
; Atmospheric variability
; Climate variability
; ENSO
; Multi-decadal time scale
; Precipitation variability
; Sea surface temperatures
; Oceanography
英文摘要: The intrinsic atmospheric and ocean-induced tropical precipitation variability is studied using millennial control simulations with various degrees of ocean coupling. A comparison between the coupled simulation and the atmosphere-only simulation with climatological sea surface temperatures (SSTs) shows that a substantial amount of tropical precipitation variability is generated without oceanic influence. This intrinsic atmospheric variability features a red noise spectrum from daily to monthly time scales and a white noise spectrum beyond the monthly time scale. The oceanic impact is inappreciable for submonthly time scales but important at interannual and longer time scales. For time scales longer than a year, it enhances precipitation variability throughout much of the tropical oceans and suppresses it in some subtropical areas, preferentially in the summer hemisphere. The sign of the ocean-induced precipitation variability can be inferred from the local precipitation-SST relationship, which largely reflects the local feedbacks between the two, although nonlocal forcing associated with El Niño-Southern Oscillation also plays a role. The thermodynamic and dynamic nature of the ocean-induced precipitation variability is studied by comparing the fully coupled and slab ocean simulations. For time scales longer than a year, equatorial precipitation variability is almost entirely driven by ocean circulation, except in the Atlantic Ocean. In the rest of the tropics, ocean-induced precipitation variability is dominated by mixed layer thermodynamics. Additional analyses indicate that both dynamic and thermodynamic oceanic processes are important for establishing the leading modes of large-scale tropical precipitation variability. On the other hand, ocean dynamics likely dampens tropical Pacific variability at multidecadal time scales and beyond. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49664
Appears in Collections: 气候变化事实与影响
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作者单位: Princeton University, Princeton, NJ, United States; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; National Center for Atmospheric Research, Boulder, CO, United States; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States
Recommended Citation:
He J.,Deser C.,Soden B.J.. Atmospheric and oceanic origins of tropical precipitation variability[J]. Journal of Climate,2017-01-01,30(9)