DOI: 10.1175/JCLI-D-14-00635.1
Scopus记录号: 2-s2.0-84942886637
论文题名: The Tokar Gap Jet: Regional circulation, diurnal variability, and moisture transport based on numerical simulations
作者: Davis S.R. ; Pratt L.J. ; Jiang H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 15 起始页码: 5885
结束页码: 5907
语种: 英语
Scopus关键词: Atmospheric movements
; Atmospheric structure
; Atmospheric thermodynamics
; Lagrange multipliers
; Moisture
; Rain
; Africa
; Atmosphere-land interactions
; Atmosphere-ocean interactions
; Hydrometeorology
; Monsoons
; Orographic effects
; Fighter aircraft
; air-sea interaction
; atmospheric circulation
; atmospheric dynamics
; atmospheric moisture
; diurnal variation
; hydrometeorology
; intertropical convergence zone
; jet stream
; moisture transfer
; monsoon
; numerical model
; orographic effect
; Arabian Peninsula
; East Africa
; Indian Ocean
; Red Sea [Indian Ocean]
英文摘要: The structure, variability, and regional connectivity of the Tokar Gap jet (TGJ) are described using WRF Model analyses and supporting atmospheric datasets from the East African-Red Sea-Arabian Peninsula (EARSAP) region during summer 2008. Sources of the TGJ's unique quasi-diurnal nature and association with atypically high atmospheric moisture transport are traced back to larger-scale atmospheric dynamics influencing its forcing. These include seasonal shifts in the intertropical convergence zone (ITCZ), variability of the monsoon and North African wind regimes, and ties to other orographic flow patterns. Strong modulation of the TGJ by regional processes such as the desert heating cycle, wind convergence at the ITCZ surface front, and the local land-sea breeze cycle are described. Two case studies present the interplay of these influences in detail. The first of these was an "extreme" gap wind event on 12 July, in which horizontal velocities in the Tokar Gap exceeded 26 ms-1 and the flow from the jet extended the full width of the Red Sea basin. This event coincided with development of a large mesoscale convective complex (MCC) and precipitation at the entrance of the Tokar Gap as well as smaller gaps downstream along the Arabian Peninsula. More typical behavior of the TGJ during the 2008 summer is discussed using a second case study on 19 July. Downwind impact of the TGJ is evaluated using Lagrangian model trajectories and analysis of the lateral moisture fluxes (LMFs) during jet events. These results suggest means by which TGJ contributes to large LMFs and has potential bearing upon Sahelian rainfall and MCC development. © 2015 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50694
Appears in Collections: 气候变化事实与影响
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作者单位: Physical Oceanography Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Applied Ocean Physics and Engineering Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Recommended Citation:
Davis S.R.,Pratt L.J.,Jiang H.. The Tokar Gap Jet: Regional circulation, diurnal variability, and moisture transport based on numerical simulations[J]. Journal of Climate,2015-01-01,28(15)