文献类型：期刊文献

英文题名：Impacts of the Maritime-Continental Thermal Contrasts on the Evolution of a Squall Line Case

作者：Chen, Jinghua[1]; Xue, Lulin[2]; Fu, Shizuo[3]; Liu, Xuancheng[4]; Deng, Liping[5]

机构：[1] China Meteorological Administration Aerosol Cloud Precipitation Key laboratory, Nanjing University of Information Science & Technology, Nanjing, China; [2] National Center for Atmospheric Research, Boulder, CO, United States; [3] School of Geographical Sciences, Fujian Normal University, Fuzhou, China; [4] National Supercomputing Center in Shenzhen [Shenzhen Cloud Computing Center], Shenzhen, China; [5] College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220055616)

语种：英文

外文摘要：A daytime squall line occurred on July 27, 2014 over the East China and quickly dissipated when it approached the coastline. In this study, the land-ocean thermal contrast effects on the squall line’s evolution are discussed via numerical simulations. During its dissipating period, the wind shear was in a comparable intensity while the cold pool dramatically weakened and eventually disappeared. Then, the balance between the cold pool and wind shear was destabilized, which tilted the upward motion and led to an unfriendly condition for triggering the new cloud cells at the gust front. Consequently, the system dissipated after the precipitation consumed the mature cloud cells. Further investigation shows that the weakening cold pool was mostly caused by the decrease of the temperature difference between airmass affected by the squall line and the environment ahead of the gust front. The cooling environment ahead of the gust front takes the main responsibility for the temperature-difference decrease. Meanwhile, the raindrop evaporation efficiency weakened slightly at the same time, which is another factor that weakens the cold pool. Affected by these two factors, the cold pool of this case diminishes quickly when it approached the coastline, causing the unbalance between the cold pool and wind shear and leading to the dissipation of the squall line. ? 2022, The Authors. All rights reserved.