【摘要】 2023年12月28日至2024年1月2日浙江省出现了一次中度污染的霾天气过程，是自2018年以来强度最大、持续时间最久的一次霾天气过程。利用同时段的环境空气质量数据和气象数据，分析了此次污染天气过程的天气形势，气团输送特征及霾天气过程的气象成因。结果表明，增温、增湿、持续低风速(<2 m/s)、无降水的地面气象条件，持续时间较长、强度较大的垂直逆温(逆温强度峰值高达2.28℃/100m),均压场或高压底部控制的静稳天气形势场等不利气象条件，导致了局地污染物的累积。浙江本地排放贡献占比高达47%,是造成此次中度污染霾天气过程的主要原因。大气污染防治行动计划实施后，虽然浙江地区颗粒物污染达到中度及以上的天数已明显减少，但是不利的气象扩散条件造成的局地颗粒物污染仍然可能导致浙江地区出现持续时间较长的霾天气过程。更多还原

【Abstract】 From December 28, 2023 to January 2, 2024, Zhejiang province experienced a moderate haze pollution process, which was the strongest and longest lasting haze process since 2018.Using the air quality data and meteorological data of the same period, the weather patterns, air mass transport characteristics and meteorological causes of this haze process were studied. The results showed that surface meteorological conditions such as warming, humidifying, continuous low wind speed(<2 m/s), and no precipitation, as well as long duration and strong vertical inversion(inversion intensity reaching the peak value of 2.28 ℃/100m), and static weather conditions controlled by uniform pressure field or high pressure bottom, resulted in adverse meteorological conditions that led to local pollution accumulation. The contribution of local emissions in Zhejiang province reached as high as 47%, which was the main cause of this haze process. Owing to the implementation of the Action Plan for Air Pollution Prevention and Control, the number of days with moderate or more severe pollution events in Zhejiang has significantly decreased, but adverse meteorological conditions might still cause local particulate matter pollution, leading to prolonged haze weather processes in Zhejiang.更多还原