DOI: 10.1002/2017JD027410
Scopus记录号: 2-s2.0-85040226814
论文题名: A Top-Down Pathway to Secondary Eyewall Formation in Simulated Tropical Cyclones
作者: Tyner B. ; Zhu P. ; Zhang J.A. ; Gopalakrishnan S. ; Marks F. ; Jr. ; Tallapragada V.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 174
结束页码: 197
语种: 英语
英文关键词: eyewall replacement cycle
; HWRF
; secondary eyewall formation
; tropical cyclone
Scopus关键词: atmospheric convection
; boundary layer
; convergence
; frontogenesis
; hurricane
; observational method
; precipitation (climatology)
; tropical cyclone
; troposphere
英文摘要: Idealized and real-case simulations conducted using the Hurricane Weather Research and Forecasting (HWRF) model demonstrate a “top-down” pathway to secondary eyewall formation (SEF) for tropical cyclones (TCs). For the real-case simulations of Hurricane Rita (2005) and Hurricane Edouard (2014), a comparison to observations reveals the timing and overall characteristics of the simulated SEF appear realistic. An important control of the top-down pathway to SEF is the amount and radial-height distribution of hydrometeors at outer radii. Examination into the simulated hydrometeor particle fall speed distribution reveals that the HWRF operational microphysics scheme is not producing the lightest hydrometeors, which are likely present in observed TCs and are most conducive to being advected from the primary eyewall to the outer rainband region of the TC. Triggering of SEF begins with the fallout of hydrometeors at the outer radii from the TC primary eyewall, where penetrative downdrafts resulting from evaporative cooling of precipitation promote the development of local convection. As the convection-induced radial convergence that is initially located in the midtroposphere extends downward into the boundary layer, it results in the eruption of high entropy air out of the boundary layer. This leads to the rapid development of rainband convection and subsequent SEF via a positive feedback among precipitation, convection, and boundary layer processes. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114718
Appears in Collections: 气候减缓与适应
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作者单位: International Hurricane Research Center, Miami, FL, United States; Department of Earth and Environment, Florida International University, Miami, FL, United States; Cooperative Institute for Marine and Atmospheric Studies, University of Miami, Miami, FL, United States; Hurricane Research Division, Atlantic Oceanographic and Meteorological Laboratory, NOAA, Miami, FL, United States; Environmental Modeling Center, National Centers for Environmental Prediction, NOAA, Washington, DC, United States
Recommended Citation:
Tyner B.,Zhu P.,Zhang J.A.,et al. A Top-Down Pathway to Secondary Eyewall Formation in Simulated Tropical Cyclones[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)