Thermodynamic Constraints on the Morphology of Simulated Midlatitude Squall Lines
Thermodynamic Constraints on the Morphology of Simulated Midlatitude Squall Lines
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DOI：
10.1175/jas-d-14-0295.1
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发表时间：
2015-08
影响因子：
3.1
通讯作者：
Diego A. Alfaro;M. Khairoutdinov
中科院分区：
文献类型：
--
作者：
Diego A. Alfaro;M. Khairoutdinov
本研究考察了环境热力学对模拟的理想化中纬度切线(SLS)形态的制约作用。用于模拟各种SLS的热力学测深主要由规定的对流可用势能(CAPE)和自由对流水平的垂直剖面来确定。结果表明，常用的CAPE指数不适合用于诊断SL特征，而积分CAPE(ICAPE)则区分给定环境切变值的风暴加热的幅度。ICAPE的技术源于它与低对流层和中对流层小块在层状对流作用下上升到冷水池时所获得的浮力的关系。环境运动学也影响暴雨引起的加热，具有较强的低层温度.
AbstractThis study examines how environmental thermodynamics constrain the morphology of simulated idealized midlatitude squall lines (SLs). The thermodynamic soundings used for simulating various SLs are specified primarily by prescribed vertical profiles of the convective available potential energy (CAPE) and the level of free convection. This framework, which contemplates the latent instability properties of both low- and midtropospheric air, is considered to be convenient for investigating layer-lifting convective phenomena.Results show that frequently used CAPE indices are unsuitable for diagnosing SL characteristics, while integrated CAPE (ICAPE) discriminates the amplitude of the storm-induced heating for a given value of environmental shear. The skill of ICAPE follows from its relation to the buoyancy attained by low- and midtropospheric parcels as they ascend over the cold pool under layer-lifting convection. Environmental kinematics also affect the storm-induced heating, with stronger low-level ...