ozone pollution around a coastal region of south china sea: interaction between marine and continental air
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2018
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Abstract
Marine atmosphere is usually considered to be a clean environment, but this
study indicates that the near-coast waters of the South China Sea (SCS) suffer
from even worse air quality than coastal cities. The analyses were based on
concurrent field measurements of target air pollutants and meteorological
parameters conducted at a suburban site (Tung Chung, TC) and a nearby marine
site (Wan Shan, WS) from August to November 2013. The observations showed
that the levels of primary air pollutants were significantly lower at WS than
those at TC, while the ozone (O3) value was greater at WS. Higher
O3 levels at WS were attributed to the weaker NO titration and
higher O3 production rate because of stronger oxidative capacity of
the atmosphere. However, O3 episodes were concurrently observed at
both sites under certain meteorological conditions, such as tropical
cyclones, continental anticyclones and sea–land breezes (SLBs). Driven by
these synoptic systems and mesoscale recirculations, the interaction between
continental and marine air masses profoundly changed the atmospheric
composition and subsequently influenced the formation and redistribution of
O3 in the coastal areas. When continental air intruded into marine
atmosphere, the O3 pollution was magnified over the SCS, and the
elevated O3 ( > 100 ppbv) could overspread the sea
boundary layer ∼ 8 times the area of Hong Kong. In some cases, the
exaggerated O3 pollution over the SCS was recirculated to the
coastal inshore by sea breeze, leading to aggravated O3
pollution in coastal cities. The findings are applicable to similar mesoscale
environments around the world where the maritime atmosphere is potentially
influenced by severe continental air pollution.
| Reference Key |
wang2018atmosphericozone
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|---|---|
| Authors | ;H. Wang;H. Wang;X. Lyu;X. Lyu;H. Guo;Y. Wang;S. Zou;Z. Ling;X. Wang;F. Jiang;Y. Zeren;W. Pan;X. Huang;J. Shen |
| Journal | Journal of agricultural and food chemistry |
| Year | 2018 |
| DOI |
10.5194/acp-18-4277-2018
|
| URL | |
| Keywords |
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