气候变化领域集成服务门户(CCPortal): Hydrometeor Size Sorting in the Asymmetric Eyewall of Hurricane Matthew (2016)

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DOI	10.1029/2020JD032671
	Hydrometeor Size Sorting in the Asymmetric Eyewall of Hurricane Matthew (2016)
	Laurencin C.N.; Didlake A.C.; Jr.; Loeffler S.D.; Kumjian M.R.; Heymsfield G.M.
发表日期	2020
ISSN	2169897X
卷号	125 期号:17
英文摘要	Polarimetric radar observations of Hurricane Matthew's asymmetric eyewall were captured by WSR-88D radars from 1500 UTC on 7 October 2016 to 0000 UTC on 8 October 2016. Raindrop size sorting was observed within the eyewall, marked by a differential reflectivity (ZDR) enhancement region situated upwind of a specific differential phase (KDP) enhancement region, both overlapping the maximum reflectivity. This signature indicated that the largest raindrops fell out of the eyewall updrafts faster than the smaller, abundant drops that were advected further downstream by the primary circulation. Airborne Doppler radar observations revealed an updraft structure in an azimuthal location consistent with the size-sorting signature and previous observational studies of eyewall kinematic asymmetries. Given that a tropical cyclone's environment or internal dynamics can modulate the eyewall's kinematic and microphysical structure, we used a simple size-sorting model that only includes sedimentation and advection of raindrops by the axisymmetric tangential wind to examine how an eyewall size-sorting signature responds to artificial changes in the tangential wind speed and initial raindrop size distributions (DSDs). The axisymmetric tangential wind was retrieved from WSR-88D radar observations using the Ground-Based Velocity Track Display technique. The simple model was capable of producing an eyewall size-sorting signature with an azimuthal separation between the simulated ZDR and KDP enhancements in general agreement with the observed separation (~20°) at low levels. Sensitivity tests showed that the azimuthal separation between the ZDR and KDP enhancements responded to changes in the tangential wind speed, but not to changes in the initial DSDs aloft. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	microphysics; polarimetric radar; radar; tropical cyclones
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185804
作者单位	Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University Park, State College, PA, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Laurencin C.N.,Didlake A.C.,Jr.,et al. Hydrometeor Size Sorting in the Asymmetric Eyewall of Hurricane Matthew (2016)[J],2020,125(17).
APA	Laurencin C.N.,Didlake A.C.,Jr.,Loeffler S.D.,Kumjian M.R.,&Heymsfield G.M..(2020).Hydrometeor Size Sorting in the Asymmetric Eyewall of Hurricane Matthew (2016).Journal of Geophysical Research: Atmospheres,125(17).
MLA	Laurencin C.N.,et al."Hydrometeor Size Sorting in the Asymmetric Eyewall of Hurricane Matthew (2016)".Journal of Geophysical Research: Atmospheres 125.17(2020).