Convectively Induced Transverse Band Signatures in Satellite Imagery
Convectively Induced Transverse Band Signatures in Satellite Imagery
复制标题
卫星图像中对流引起的横向带特征
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
S. Ackerman
中科院分区：
文献类型：
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作者：
A. Lenz;K. Bedka;W. Feltz;S. Ackerman
摘要雷暴外流中经常能观察到横向卷云带，但有关这方面的文献很少。本文的主要目的是通过参考风暴的位置、移动和生命周期来表征卫星图像中的横向波段特征。在2006年5月至8月期间分析的所有对流系统中，近一半观察到了横向带特征，通常在系统的成熟期和衰退期。风暴的大小和传播似乎不影响横向频带，尽管这些频带似乎与负的300百帕的相对涡度和正的辐散有关。横带平均持续时间为9h，一般出现在夜间。卫星分析与商用飞机收集的涡耗散率(EDR)大气湍流观测相结合。在93%(44%)的EV中，至少有一次在横带内观察到了轻度(中度)湍流。
Abstract Transverse cirrus bands have commonly been observed in the outflow of thunderstorms, though little literature exists on the subject. The primary objective of this paper is to characterize the transverse band signature in satellite imagery with references to storm location, movement, and life cycle. The transverse band signature was observed in nearly half of all convective systems analyzed between May and August 2006, commonly in the mature and decay stages of the system. Storm size and propagation did not appear to influence transverse bands, though the bands did appear to be associated with negative 300-hPa relative vorticity and positive divergence. Transverse bands lasted an average duration of 9 h and generally occurred during the nighttime hours. The satellite analysis was combined with eddy dissipation rate (EDR) atmospheric turbulence observations collected by commercial aircraft. At least one observation of light (moderate) turbulence was found within transverse bands for 93% (44%) of ev...