Rapid Evolution of Cool Season, Low-CAPE Severe Thunderstorm Environments
Rapid Evolution of Cool Season, Low-CAPE Severe Thunderstorm Environments
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DOI：
10.1175/waf-d-16-0141.1
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发表时间：
2017-04
影响因子：
2.9
通讯作者：
J. King;M. Parker;Keith D. Sherburn;G. Lackmann
中科院分区：
文献类型：
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作者：
J. King;M. Parker;Keith D. Sherburn;G. Lackmann
摘要低CAPE（即，CAPE ≤ 1000 J kg−1）的强雷暴在美国大东南部地区（包括田纳西州和俄亥俄州山谷）很常见。这些事件往往预测不佳，发生这些事件的环境可能迅速演变。在对流允许分辨率下，对11个低CAPE严重事件和6个低CAPE非严重事件进行了真实数据模拟。在所有模拟的事件发生在3小时期间对流之前，一些量的表面为基础的不稳定。大多数模拟的严重事件经历了相对于非严重事件的表面变暖，冷却高空，和表面润湿的结果比较大的不稳定。在某些情况下，大尺度上升强迫释放的潜在不稳定性可能影响高空的冷却。地面变暖主要归因于暖平流，似乎是严重和非严重的模拟事件之间的一个重要因素。严重的事件也被发现有很大的...
AbstractLow-CAPE (i.e., CAPE ≤ 1000 J kg−1) severe thunderstorms are common in the greater southeastern United States (including the Tennessee and Ohio valleys). These events are often poorly forecasted, and the environments in which they occur may rapidly evolve. Real-data simulations of 11 low-CAPE severe events and 6 low-CAPE nonsevere events were performed at convection-allowing resolution. Some amount of surface-based destabilization occurred during all simulated events over the 3-h period prior to convection. Most simulated severe events experienced comparatively large destabilization relative to the nonsevere events as a result of surface warming, cooling aloft, and surface moistening. The release of potential instability by large-scale forcing for ascent likely influenced the cooling aloft in some cases. Surface warming was attributable primarily to warm advection and appeared to be an important discriminator between severe and nonsevere simulated events. Severe events were also found to have larg...