气候变化领域集成服务门户(CCPortal): Impacts of future land use and land cover change on mid-21st-century surface ozone air quality: Distinguishing between the biogeophysical and biogeochemical effects

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DOI	10.5194/acp-20-11349-2020
	Impacts of future land use and land cover change on mid-21st-century surface ozone air quality: Distinguishing between the biogeophysical and biogeochemical effects
	Wang L.; Tai A.P.K.; Tam C.-Y.; Sadiq M.; Wang P.; Cheung K.K.W.
发表日期	2020
ISSN	16807316
起始页码	11349
结束页码	11369
卷号	20 期号:19
英文摘要	Surface ozone (O3) is an important air pollutant and greenhouse gas. Land use and land cover is one of the critical factors influencing ozone, in addition to anthropogenic emissions and climate. Land use and land cover change (LULCC) can on the one hand affect ozone "biogeochemically", i.e., via dry deposition and biogenic emissions of volatile organic compounds (VOCs). LULCC can on the other hand alter regional-to large-scale climate through modifying albedo and evapotranspiration, which can lead to changes in surface temperature, hydrometeorology, and atmospheric circulation that can ultimately impact ozone "biogeophysically". Such biogeophysical effects of LULCC on ozone are largely understudied. This study investigates the individual and combined biogeophysical and biogeochemical effects of LULCC on ozone and explicitly examines the critical pathway for how LULCC impacts ozone pollution. A global coupled atmosphere chemistry land model is driven by projected LULCC from the present day (2000) to the future (2050) under RCP4.5 and RCP8.5 scenarios, focusing on the boreal summer. Results reveal that when considering biogeochemical effects only, surface ozone is predicted to have slight changes by up to 2 ppbv maximum in some areas due to LULCC. It is primarily driven by changes in isoprene emission and dry deposition counteracting each other in shaping ozone. In contrast, when considering the combined effect of LULCC, ozone is more substantially altered by up to 5 ppbv over several regions in North America and Europe under RCP4.5, reflecting the importance of biogeophysical effects on ozone changes. In boreal and temperate mixed forests with intensive reforestation, enhanced net radiation and sensible heat induce a cascade of hydrometeorological feedbacks that generate warmer and drier conditions favorable for higher ozone levels. In contrast, reforestation in subtropical broadleaf forests has minimal impacts on boundary-layer meteorology and ozone air quality. Furthermore, significant ozone changes are also found in regions with only modest LULCC, which can only be explained by "remote" biogeophysical effects. A likely mechanism is that reforestation induces a circulation response, leading to reduced moisture transport and ultimately warmer and drier conditions in the surrounding regions with limited LULCC. We conclude that the biogeophysical effects of LULCC are important pathways through which LULCC influences ozone air quality both locally and in remote regions even without significant LULCC. Overlooking the effects of hydrometeorological changes on ozone air quality may cause underestimation of the impacts of LULCC on ozone pollution. © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	air quality; atmospheric chemistry; atmospheric pollution; biogeochemistry; boundary layer; land cover; land use change; ozone depletion; twenty first century; North America
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/143918
作者单位	Institute of Environment, Energy and Sustainability, Chinese University of Hong Kong, Shatin, Hong Kong; Department of Geography and Resource Management, Chinese University of Hong Kong, Shatin, Hong Kong; Earth System Science Programme, Faculty of Science, Chinese University of Hong Kong, Shatin, Hong Kong; Partner State Key Laboratory of Agrobiotechnology, Chinese University of Hong Kong, Shatin, Hong Kong; Department of Earth and Environmental Sciences, Macquarie University, Sydney, 2109, Australia; Climate Research, Nsw Department of Planning, Industry and Environment, Sydney, Australia
推荐引用方式 GB/T 7714	Wang L.,Tai A.P.K.,Tam C.-Y.,et al. Impacts of future land use and land cover change on mid-21st-century surface ozone air quality: Distinguishing between the biogeophysical and biogeochemical effects[J],2020,20(19).
APA	Wang L.,Tai A.P.K.,Tam C.-Y.,Sadiq M.,Wang P.,&Cheung K.K.W..(2020).Impacts of future land use and land cover change on mid-21st-century surface ozone air quality: Distinguishing between the biogeophysical and biogeochemical effects.Atmospheric Chemistry and Physics,20(19).
MLA	Wang L.,et al."Impacts of future land use and land cover change on mid-21st-century surface ozone air quality: Distinguishing between the biogeophysical and biogeochemical effects".Atmospheric Chemistry and Physics 20.19(2020).