摘要
利用2015—2018年杭州市富阳地区国控站污染数据、自动站和GDAS气象资料及对海平面气压场进行天气分型的基础上,使用HYSPLIT模型、潜在源贡献因子(WPSCF)分析法和浓度权重轨迹(WCWT)分析法,研究富阳地区冬季污染现状及不同天气形势下PM_(2.5)的输送路径与潜在源区分布特征.结果表明,2015—2018年富阳地区冬季PM_(2.5)浓度持续较高且变化趋势不明显,污染区域输送问题不容忽视.通过天气分型得到该地区冬季主要受高压、高压前部、高压底部、L型高压、低压和低压前部6种天气形势影响,其中,高压和高压底部控制下PM_(2.5)浓度均值较高,分别为65μg·m^(-3)和58μg·m^(-3).对各天气形势下气团轨迹聚类分析得到,高压和高压前部控制下污染气团主要来自山东、江苏等地,高压底部和L型高压控制下污染气团主要来自内蒙古、辽宁等地,低压和低压前部控制下污染气团主要来自浙江中部、东南部地区.不同天气形势下WPSCF和WCWT得到的分布特征类似,高压控制下潜在源区分布范围最广,位于浙江西南部、东北部、上海和江苏东南部地区,其次为高压底部控制,潜在源区位于浙江中东部、东北部和上海地区,高压前部、L型高压、低压和低压前部的潜在源区范围较小,基本位于浙江、江苏南部和上海等地.
In this study, we investigated the situation of winter pollution in Fuyang District of Hangzhou city, based on the pollution data, meteorological data obtained in automatic stations and GDAS from the National Control Station from the year 2015 to 2018. The transport paths and the potential source areas of PM_(2.5) under different weather conditions were also studied, using a weather classification of the pressure field at the sea level, the HYSPLIT model, a potential source contribution factor(WPSCF) analysis and a Concentration weighted trajectory(WCWT) analysis. The results showed that the concentration of PM_(2.5) in Fuyang is continuously high during the winter from the year 2015 to 2018, and the change is unobvious, indicating that the contribution of the transportation to the pollution is possibly large. According to the weather classification, in winter this area is mostly dominated by six weather conditions: high pressure, front of high pressure, bottom of high pressure, L-shaped high pressure, low pressure and front of low pressure. Among them, the averaged concentration of PM_(2.5) under the control of high pressure and bottom of high pressure is high, reaching to 65 μg·m^(-3) and 58 μg·m^(-3), respectively. Moreover, the cluster analysis of the air mass trajectory under various weather conditions shows that the polluted air masses under high pressure and front of high pressure mainly come from Shandong and Jiangsu. In contrast, the polluted air masses under the control of bottom of high pressure and L-shaped high pressure control mainly come from Inner Mongolia, Liaoning and other places. With respect to pollution air masses under the control of low pressure and the front of low pressure, they mainly come from the central and southeastern parts of Zhejiang. The properties of the pollutant distribution obtained by using WPSCF and WCWT under different weather conditions are similar. It was found that under the control of high pressure, the potential source area is the widest, located in the southwest, northeast, Shanghai and southeast of Jiangsu. It is followed by the bottom control of high pressure, in which the potential source area is located in the central and eastern, north eastern of Zhejiang and Shanghai regions. At last, the potential source areas of the front of high pressure, L-shaped high pressure, low pressure and front of low pressure are relatively small, and they are mostly located in Zhejiang, southern Jiangsu and Shanghai.
作者
郭赈东
王成刚
赵嘉琪
张日佳
姜盈
GUO Zhendong;WANG Chenggang;ZHAO Jiaqi;ZHANG Rijia;JIANG Ying(Key Laboratory for Aerosol-Cloud-Precipitation,China Meteorological Administration,Nanjing University of Information Science and Technology,Nanjing 210044;Hangzhou Fuyang Meteorological Bureau,Fuyang 311400)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第5期1680-1689,共10页
Acta Scientiae Circumstantiae
基金
国家重点研发计划(No.2016YFA0602003)
国家自然科学基金面上项目(No.41975011)
杭州富阳政府资助项目(No.ZJHCCGFY-0808001)。
关键词
天气分型
PM_(2.5)
区域传输
潜在源区
富阳
冬季
weather classification
PM_(2.5)
regional transportation
potential sources
Fuyang
winter
