DOI: 10.1175/JCLI-D-16-0776.1
Scopus记录号: 2-s2.0-85052926009
论文题名: Impacts of Saharan dust on Atlantic regional climate and implications for tropical cyclones
作者: Pan B. ; Wang Y. ; Hu J. ; Lin Y. ; Hsieh J.-S. ; Logan T. ; Feng X. ; Jiang J.H. ; Yung Y.L. ; Zhang R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 18 起始页码: 7621
结束页码: 7644
语种: 英语
英文关键词: Tropical variability
Scopus关键词: Atmospheric humidity
; Budget control
; Entropy
; Hurricanes
; Oceanography
; Rain
; Storms
; Surface waters
; Tropics
; African easterly jet
; Community atmospheric model
; Intertropical convergence zone
; Microphysical property
; Sea surface temperature (SST)
; Short-wave radiation
; Tropical variability
; West African Monsoon
; Dust
英文摘要: The radiative and microphysical properties of Saharan dust are believed to impact the Atlantic regional climate and tropical cyclones (TCs), but the detailed mechanism remains uncertain. In this study, atmosphereonly simulations are performed from 2002 to 2006 using the Community Atmospheric Model, version 5.1, with and without dust emission from the Sahara Desert. The Saharan dust exhibits noticeable impacts on the regional longwave and shortwave radiation, cloud formation, and the convective systems over West Africa and the tropical Atlantic. The African easterly jet and West African monsoon are modulated by dust, leading to northward shifts of the intertropical convergence zone and the TC genesis region. The dust events induce positive midlevel moisture and entropy deficit anomalies, enhancing the TC genesis. On the other hand, the increased vertical wind shear and decreased low-level vorticity and potential intensity by dust inhibit TC formation in the genesis region. The ventilation index shows a decrease in the intensification region and an increase in the genesis region by dust, corresponding to favorable and unfavorable TC activities, respectively. The comparison of nondust scenarios in 2005 and 2006 shows more favorable TC conditions in 2005 characterized by higher specific humidity and potential intensity, but lower ventilation index, wind shear, and entropy deficit. Those are attributable to the observed warmer sea surface temperature (SST) in 2005, in which dust effects can be embedded. Our results imply significant dust perturbations on the radiative budget, hydrological cycle, and large-scale environments relevant to TC activity over the Atlantic. © 2018 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110708
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: Department of Atmospheric Sciences, Texas A and M University, College Station, TX, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; College of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Haizhu District, Guangzhou, China
Recommended Citation:
Pan B.,Wang Y.,Hu J.,et al. Impacts of Saharan dust on Atlantic regional climate and implications for tropical cyclones[J]. Journal of Climate,2018-01-01,31(18)