The effects of coastal local circulations and their interactions on ozone pollution in the Hangzhou metropolitan area

Han, Zaw; Liu, H.N.; Yu, Bu; Wang, X.Y.

doi:10.1016/j.uclim.2023.101417

Cited by 3 publications

(1 citation statement)

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“…Measurements have been made by ferry (Cleary et al, 2015), aircraft campaigns (Levy et al, 2010), and with ground data (Lyons and Cole, 1976) to model and understand the local-scale flow pattern. Elevated levels of ozone pollution over water and coastal areas have been studied globally in areas such as Chesapeake Bay, United States (Stauffer and Thompson, 2015), Naples, Italy (Finardi et al, 2018), and Hangzhou, China (Han et al, 2023). The relationship between ozone pollution and lake-breeze circulation has been studied in the North American Great Lakes region such as Lake Michigan (Cleary et al, 2022b(Cleary et al, , a, 2015Lennartson and Schwartz, 2002), Lake Erie (Levy et al, 2010), and Lake Ontario (Wentworth et al, 2015) and globally, such as in Lake Taihu in China (Zhang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Measurement report: Observations of ground-level ozone concentration gradients perpendicular to the Lake Ontario shoreline

Huang,

Donaldson

2024

Atmos. Chem. Phys.

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Abstract. Ground-level ozone (O3) is a secondary air pollutant that has harmful effects on human and ecosystem health. Close to larger bodies of water, the well-known sea-breeze (or lake-breeze) phenomenon plays a role in regulating ground-level ozone levels. An observed lake-edge removal effect, where ozone concentration decreases within the first 500 m to 1 km perpendicular to the lake, is thought to be related to the lake-breeze circulation as well as several dilution and removal pathways. A field campaign was conducted in summer 2022 and winter 2023 in two locations on the north shore of Lake Ontario: the urban centre of Toronto and suburban Oshawa, some 50 km east, to assess how the local environment and season affect the lake-edge removal effect. Ozone, wind speed, and wind direction were measured on 6–7 different days in each season and city along transects perpendicular to Lake Ontario's shoreline. A consistent negative linear relationship between ozone concentration and distance from shore over the first 500 m (i.e. a lake-edge removal effect) was observed in both cities and both seasons. The ozone gradient changed in Oshawa from −23.5 ± 8.5 (1 standard deviation) ppb km−1 in summer to −8.1 ± 5.1 ppb km−1 in winter. The slope remained consistent in Toronto at −15.4 ± 6.7 ppb km−1 in summer and −16.7 ± 7.3 ppb km−1 in winter. The year-round observation of an ozone gradient and lake-edge removal effect suggests that there is an inherent “baseline” ozone concentration gradient at the lake edge, caused by the dilution effect of the rapid increase of the boundary layer there. This gradient is seen to be enhanced in the summer and dependent on local effects such as lake-breeze circulation and increased deposition to vegetation.

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