globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2014MS000366
Scopus记录号: 2-s2.0-85027936240
论文题名:
Evaluation of the impact of moist convection on the development of asymmetric inner core instabilities in simulated tropical cyclones
作者: Naylor J; , Schecter D; A
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2014
卷: 6, 期:4
起始页码: 1027
结束页码: 1048
语种: 英语
英文关键词: Hurricanes ; Kinetic energy ; Kinetics ; Mixing ; Shear flow ; Stability ; Storms ; Tropics ; Vortex flow ; Vorticity ; Cloud-resolving numerical model ; Eddy kinetic energy ; Energetic analysis ; Long-term effects ; Maximum wind speed ; Potential vorticity mixing ; Secondary circulation ; Tropical cyclone ; Wind ; asymmetry ; atmospheric convection ; drag coefficient ; hurricane ; inner core ; tropical cyclone ; updraft ; vorticity ; wind velocity
英文摘要: This paper examines the nature and consequences of inner core instabilities in several intense tropical cyclones (TCs) simulated with a cloud-resolving numerical model. The initial wave growth leading to polygonal eyewalls and mesovortices in each TC is shown to closely resemble that found in a dry nonconvective vortex with the same primary circulation. Such agreement is reasonable partly because the bulk of the cloudy eyewall updraft is outside the vorticity ring in which the instability occurs. An energetic analysis of the TC instability verifies that the symmetric secondary circulation contributes relatively little to the early growth of eddy kinetic energy. On a longer time scale, isentropic potential vorticity mixing triggered by the instability irreversibly reduces the maximum wind speed of the dry vortex. In the more realistically simulated TC, moist convection modulates the mixing and regenerates the broken vorticity ring. Eventually, the maximum wind speed of the TC and the local parameters that determine its theoretical magnitude return to within a few percent of their preinstability values. It is found that the time scale for wind speed restoration is sensitive to the surface drag coefficient. The long-term effects of inner core instability on precipitation are briefly addressed. Key Points Moist convection has little impact on initial asymmetric wave growth Main source term of asymmetric KE involves radial shear of primary circulation Moist convection reduces intensity loss otherwise caused by instabilities © 2014. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76110
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: NorthWest Research Assoc., Boulder, CO, United States; Now at Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States

Recommended Citation:
Naylor J,, Schecter D,A. Evaluation of the impact of moist convection on the development of asymmetric inner core instabilities in simulated tropical cyclones[J]. Journal of Advances in Modeling Earth Systems,2014-01-01,6(4)
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