2024年8月18日~21日葫芦岛市一次特强暴雨天气水汽源地及对农业的影响分析

Analysis of the Source of Water Vapour and Impacts on Agriculture during an Exceptionally Heavy Rainstorm In Huludao City from 18 to 21 August 2024

摘要: 选用常规气象观测资料、NCEP/NCAR全球再分析资料等，利用水汽通量场方法，重点针对2024年8月18~21日葫芦岛市出现的特强暴雨天气过程及对农业的影响进行分析。结果表明，这次降水过程具有降水量大、持续时间长影响范围广及破坏性大的特点，是由东北冷涡、副热带高压及台风“云雀”的水汽输送共同影响造成的，其降水过程的主要水汽来源于西南季风水汽和东南风带来的渤海、东海、黄海及太平洋上水汽，加上低空切变线为降雨制造良好动力条件，多种因素综合影响下导致强降雨发生。

Abstract: Conventional meteorological observations and NCEP/NCAR global reanalysis data were selected, and the water vapour flux field method was used to analyse the weather process of the exceptionally heavy rainfall that occurred in Huludao City from 18 to 21 August 2024 and its impact on agriculture. The results show that this precipitation process is characterized by large precipitation amount, long duration, wide range of impacts and devastation, and is caused by the joint influence of the Northeast cold vortex, subtropical high pressure and water vapour transport of Typhoon “Lark”, and the main water vapour source of the precipitation process is the water vapour from the Southwest monsoon wind and water vapour brought by the Southeast wind from the Bohai Sea, East Sea, Yellow Sea and the Pacific Ocean, together with the water vapour in the low altitude. The main source of water vapour in the precipitation process comes from the water vapour of the southwest monsoon and the water vapour brought by the southeast wind in the Bohai Sea, East China Sea, Yellow Sea and the Pacific Ocean, together with the low-altitude shear to create good power conditions for the rainfall, and the combination of various factors leads to the occurrence of heavy rainfall.