海风锋触发对流的研究进展与展望

Research Progress and Prospect of Sea Breeze Front Triggering Convection Initiation

  • 摘要: 海风锋是海风环流前缘形成的中尺度锋面系统,具有类似冷锋的动力特征,是沿海地区强对流天气的主要触发机制之一。海风锋触发强对流的物理过程研究是沿海中尺度气象学的重点和难点,也是提升沿海局地突发性强对流天气短时临近预报水平的关键所在。为加深对海风锋触发对流机理的认识并系统梳理最新研究成果,文中综述了海风锋的水平和垂直结构特征、垂直伸展高度、向内陆推进距离及移动速度等基本属性;重点总结了海风锋与阵风锋、弱冷锋、城市热岛、水平对流卷、湖(河)风锋及涌等边界层辐合系统相互作用触发对流的观测事实与数值模拟研究成果。结果表明,上述相互作用过程通过改变局地动力、热力条件,调控对流的触发时间、位置及强度,为阐释局地对流触发机制及优化突发强对流天气的预报预警模型提供了科学依据。针对当前研究中边界层精细观测能力不足、区域差异机理不清等问题,建议未来重点加强边界层多要素协同探测技术研发,并开展不同气候区海风锋与其他边界层辐合系统相互作用的气候学统计特征及物理机理研究,以期进一步完善海风锋触发对流的理论体系。

     

    Abstract: The sea breeze front (SBF) is a mesoscale frontal system formed at the leading edge of the sea breeze circulation, similar to the characteristics of a cold front. It is one of the main triggering mechanisms for strong convective weather in coastal areas. The study on the physical process of the SBF-triggering convection is a critical and difficult problem in coastal mesoscale meteorology, and it is also a key point for the enhancement of the short-term forecast and nowcast capabilities for local sudden strong convective weather in coastal areas. To deepen the understanding of the convection initiation mechanism triggered by the SBF and systematically review the latest research findings, this paper outlines the basic characteristics of the SBF, such as their horizontal and vertical structural features, vertical extension height, inland propagation distance, and movement speed. It focuses on summarizing the observation and numerical simulation results of convection initiation triggered by the interactions between the SBF and other boundary-layer convergence systems, including gust fronts, weak cold fronts, urban heat islands, horizontal convective rolls, lake (river) breeze fronts, and bore. The research results show that these interaction processes can regulate the timing, location, and intensity of convection by altering local dynamic and thermal conditions. The study provides scientific basis for elucidating the mechanisms of local convection initiation and optimizing the forecasting and warning models for sudden strong convective weather. In view of the drawbacks in the research, such as insufficient fine-scale boundary-layer observation capabilities and unclear mechanism of regional differences, it is suggested that future research should focus on strengthening the development of multi-element collaborative detection technologies for the boundary layer and conducting studies on the climatological statistical characteristics and physical mechanism of the interactions between the SBF and other boundary-layer convergence systems in different climatic regions, in pursuit of further improving the theoretical system of the SBF-triggering convection initiation.

     

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