DOI: 10.1002/2016JD025500
论文题名: An investigation on how inner-core structures obtained through radar data assimilation affect track forecasting of typhoon Jangmi (2008) near Taiwan Island
作者: Wang M. ; Xue M. ; Zhao K.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 18 起始页码: 10601
结束页码: 10616
语种: 英语
英文关键词: inner-core structure
; radar data assimilation
; TC track
Scopus关键词: asymmetry
; data assimilation
; forecasting method
; inner core
; radar
; tracking
; tropical cyclone
; typhoon
; ventilation
; vortex
; Taiwan
英文摘要: The impacts of radar data assimilation (DA) on the westward track deflection of Typhoon Jangmi (2008) near Taiwan Island and the deflection mechanism are investigated. Initial conditions from two data assimilation experiments with significant track forecast differences are analyzed and compared. The environmental, axisymmetric, wave number 1 to 3 asymmetric fields of the typhoon are decomposed by using vortex separation and Fourier decomposition methods. The components are selectively recomposed into new initial conditions that include different vortex-scale components to examine the impact of individual components on the track prediction. The wave number 1 asymmetric structure is found to play a dominant role in the westward deflection of Typhoon Jangmi, and the accurate analysis of this component with radar DA helps to improve the track forecast. The wave number 1 asymmetric circulation is manifested as a pair of cyclonic and anticyclonic gyres with well-defined ventilation flows through the inner-core region, which provides additional steering of the typhoon vortex. The layer-mean environmental steering flow and ventilation flow associated with the wave number 1 gyres are further calculated to quantitatively evaluate the impact of ventilation flow. The ventilation flow is shown to be responsible for most of the westward motion component, suggesting again its role in causing the westward track deflection of Typhoon Jangmi. The results also suggest the importance of analyzing vortex-scale asymmetric structures for accurate tropical cyclone track forecasting, especially when there is a significant track deflection. ©2016. American Geophysical Union. All Rights Reserved.
资助项目: 41275031
; 41322032
; 41605026
; AGS-0802888
; AGS-1046171
; AGS-1261776
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62821
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Key Laboratory of Mesoscale Severe Weather/MOE and School of Atmospheric Science, Nanjing University, Nanjing, China; Center for Analysis and Prediction of Storms, Norman, OK, United States; School of Meteorology, University of Oklahoma, Norman, OK, United States
Recommended Citation:
Wang M.,Xue M.,Zhao K.. An investigation on how inner-core structures obtained through radar data assimilation affect track forecasting of typhoon Jangmi (2008) near Taiwan Island[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(18)