海湾
环境科学
河口
CMAQ
臭氧
中尺度气象学
海风
空气污染
污染
空气质量指数
污染物
大气科学
气候学
海洋学
气象学
地理
地质学
生态学
化学
有机化学
生物
作者
Yangzong Zeren,Beining Zhou,Yanhua Zheng,Fei Jiang,Xiaopu Lyu,Likun Xue,Hongli Wang,Xufei Liu,Hai Guo
标识
DOI:10.1021/acs.est.2c05126
摘要
As important regions of transition between land and sea, the three bay areas of Bohai Bay (BHB), Hangzhou Bay (HZB), and Pearl River Estuary (PRE) in China often suffer from severe photochemical pollution despite scarce anthropogenic emissions. To understand the causes of high ozone (O3) concentrations, the high O3 episode days associated with special synoptic systems in the three bays were identified via observations and simulated by the weather research and forecasting coupled with community multiscale air quality (WRF-CMAQ) model. It was revealed that the interaction between synoptic winds and mesoscale breezes resulted in slow wind speeds over the HZB and PRE, where air pollutants transported from upwind cities gained a long residence time and subsequently participated in intensive photochemical reactions. The net O3 production rates within the bay areas were even comparable to those in surrounding cities. This finding was also applicable to BHB but with lower net O3 production rates, while high levels of background O3 and the regional transport from farther upwind BHB partially elevated the O3 concentrations. Hence, these three bay areas served as O3 "pools" which caused the accumulation of air pollutants via atmospheric dynamics and subsequent intense photochemical reactions under certain meteorological conditions. The results may be applicable to other similar ecotones around the world.
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