上海海陆风特征及其对臭氧浓度的影响

Characteristics of Sea-Land Breeze and Its Impact on Ozone Concentrations in Shanghai

利用2013—2016年常规气象观测数据和再分析资料,提出上海地区海陆风判断标准,统计了该地区的海陆风发生规律。同时,结合地面空气质量监测数据,分析了海陆风环流对臭氧(O3)浓度的影响。结果表明:上海地区的海陆风发生频率在3—8月份较高,与海陆温差年变化之间存在显著相关性;海风通常开始于当地时间9:00前后,结束于20:00前后,最大风速出现在15:00前后,平均风速为3.9m/s;海陆风发生时O3质量浓度峰值被抬高(16μg/m^3),且峰值出现时间延后;海陆风的影响可深入上海内陆青浦淀山湖地区,对污染物浓度的影响程度沿海大于内陆。

Based on the conventional meteorological data and reanalysis data from 2013 to 2016, a judgment criteria of sea-land breeze in Shanghai was established and its characteristics were studied. Meanwhile, combined with air quality monitoring data, the impact of sea-land breeze on ozone concentration was analyzed. The results showed that the sea-land breeze occurred frequently from March to August, which significantly correlated with the temperature difference between land and sea in Shanghai. Generally, the sea breeze started at around 9:00 and ended at around 20:00, the maximum wind velocity appeared at around 15:00, the average wind speed was 3.9 m/s. When sea-land breeze blew, the peak value of ozone concentration rose (16 μg/m^3 ), and delayed occurrence. The sea-land breeze would intrude on Shanghai inland area Dianshan Lake, and the pollutant concentration in the coastal region was influenced more than that from inland.