How important is the isothermal expansion effect in elevating equivalent potential temperature in the hurricane inner core?
How important is the isothermal expansion effect in elevating equivalent potential temperature in the hurricane inner core?
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DOI：
10.1002/qj.1969
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发表时间：
2013
影响因子：
8.9
通讯作者：
Roger K. Smith;M. Montgomery
中科院分区：
文献类型：
--
作者：
Roger K. Smith;M. Montgomery
基于美国国家航空航天局（NASA）在对流层上层释放的机载落风探空仪、成因和快速强化过程（GRIP）实验，研究了成熟大西洋飓风Earl（2010）的热力学结构。资料的垂直探测剖面提出了等温膨胀和相对湿度增加在抬升空气团向眼壁对流区旋转的等效势温中的相对作用问题。这次4级飓风连续两天的观测结果表明，等温膨胀效应导致在眼壁外区域和眼壁和眼区之间移动的边界层空气包裹的等效势温增加了大约一半。版权所有©2012英国皇家气象学会
We examine aspects of the thermodynamic structure of mature Atlantic hurricane Earl (2010) based on airborne dropwindsondes released from the upper troposphere during the National Aeronautics and Space Administration (NASA), Genesis and Rapid Intensification Processes (GRIP) experiment. Vertical sounding profiles of the data raise questions concerning the relative roles of isothermal expansion and relative humidity increase in elevating the equivalent potential temperature of air parcels spiralling inwards to the eyewall convection region. The observational results obtained for two successive days of this category 4 hurricane show that the isothermal expansion effect leads to roughly one half of the increment in equivalent potential temperature for boundary‐layer air parcels moving between the region outside the eyewall and the eyewall and eye region. Copyright © 2012 Royal Meteorological Society