文章摘要
春季东海黑潮锋影响对流云的个例分析
Case study of the East China Sea Kuroshio Front effect on strong convective cloud in spring
投稿时间:2022-01-26  修订日期:2022-03-09
DOI:
中文关键词: 东海黑潮锋  大气边界层  表层风辐合  潜热释放
英文关键词: The East China Sea Kuroshio Front  atmosphere boundary layer  surface wind convergence  Latent heat release
基金项目:国家自然科学基金,41876130号;国家重点研发计划2019YFC,1510102号;国家自然科学基金,41975024号
作者单位邮编
周解梦 中国海洋大学海洋与大气学院 266100
张苏平 中国海洋大学海洋与大气学院 266100
张银意 连云港市气象局 222006
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中文摘要:
   本文利用卫星观测和再分析资料,研究了2018年4月30日东海黑潮海表面温度锋(黑潮锋)影响低云突破边界层发展为对流云团,并导致强降水的过程,结果表明:在500hPa高压脊控制下,东海低空受西南风和东南风风场辐合的影响,在边界层下方低云发展。黑潮锋的暖水侧海洋向大气输送热量和水汽,稳定性减弱;而冷水侧对大气的冷却作用显著,大气稳定性增加。经过约12小时的调整,黑潮锋通过垂直混合机制强迫表层风速发生变化,在黑潮锋上空形成风速 辐合,与背景辐合场叠加,导致辐合明显增强。受平流效应影响,黑潮锋上空大气增湿增温,抬升凝结高度降低。潜热释放与低空辐合之间形成正反馈,最终导致对流云团发展,降水强度显著增强。
英文摘要:
   Using satellite observation and reanalysis data, this paper reveals the process that A sea surface temperature front associated with the East China Sea Kuroshio (the Kuroshio front) induces low cloud within the atmosphere boundary layer evolve into convective cloud, and leads to heavy precipitation on April 30, 2018. The results show that: under the control of high-pressure ridge, wind convergence induced by southwest and southeast wind promotes development of low clouds. The warm water side of the Kuroshio front delivers heat and moisture to the atmosphere and reduces the instability, while the cold side has a significant cooling effect on the atmosphere, strengthening the stability of atmosphere boundary layer. After about 12-hour adjustment, the Kuroshio front forces surface wind speed to change through the vertical mixing mechanism, forming wind speed convergence. Superimposed with the background field, it generates a prominent enhancement of the convergence. Affected by advection effect, moisture and temperature of the atmosphere over the Kuroshio Front are increased, lowering the lifting condensation level. Positive feedback between latent heat release and surface convergence eventually promotes the growth of deep convective clouds with significantly enhanced precipitation intensity.
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