气候变化领域集成服务门户(CCPortal): Examining the competing effects of contemporary land management vs. land cover changes on global air quality

CCPortal

DOI	10.5194/acp-21-16479-2021
	Examining the competing effects of contemporary land management vs. land cover changes on global air quality
	Wong A.Y.H.; Geddes J.A.
发表日期	2021
ISSN	1680-7316
起始页码	16479
结束页码	16497
卷号	21 期号:21
英文摘要	Our work explores the impact of two important dimensions of land system changes, land use and land cover change (LULCC) as well as direct agricultural reactive nitrogen (Nr) emissions from soils, on ozone (O3) and fine particulate matter (PM2.5) in terms of air quality over contemporary (1992 to 2014) timescales. We account for LULCC and agricultural Nr emissions changes with consistent remote sensing products and new global emission inventories respectively estimating their impacts on global surface O3 and PM2.5 concentrations as well as Nr deposition using the GEOS-Chem global chemical transport model. Over this time period, our model results show that agricultural Nr emission changes cause a reduction of annual mean PM2.5 levels over Europe and northern Asia (up to -2.1 μg m-3) while increasing PM2.5 levels in India, China and the eastern US (up to +3.5 μg m-3). Land cover changes induce small reductions in PM2.5 (up to -0.7 μg m-3) over Amazonia, China and India due to reduced biogenic volatile organic compound (BVOC) emissions and enhanced deposition of aerosol precursor gases (e.g., NO2, SO2). Agricultural Nr emission changes only lead to minor changes (up to ±0.6 ppbv) in annual mean surface O3 levels, mainly over China, India and Myanmar. Meanwhile, our model result suggests a stronger impact of LULCC on surface O3 over the time period across South America; the combination of changes in dry deposition and isoprene emissions results in -0.8 to +1.2 ppbv surface ozone changes. The enhancement of dry deposition reduces the surface ozone level (up to -1 ppbv) over southern China, the eastern US and central Africa. The enhancement of soil NO emission due to crop expansion also contributes to surface ozone changes (up to +0.6 ppbv) over sub-Saharan Africa. In certain regions, the combined effects of LULCC and agricultural Nr emission changes on O3 and PM2.5 air quality can be comparable (>20 %) to anthropogenic emission changes over the same time period. Finally, we calculate that the increase in global agricultural Nr emissions leads to a net increase in global land area (+3.67×106km2) that potentially faces exceedance of the critical Nr load (>5 kg N ha-1 yr-1). Our result demonstrates the impacts of contemporary LULCC and agricultural Nr emission changes on PM2.5 and O3 in terms of air quality, as well as the importance of land system changes for air quality over multidecadal timescales. © 2021 Anthony Y. H. Wong.
语种	英语
scopus关键词	air quality; concentration (composition); dry deposition; emission inventory; isoprene; land cover; land management; land use change; nitrogen; ozone; particulate matter; soil emission; China; Europe; India; Myanmar; United States
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/246447
作者单位	Department of Earth and Environment, Boston University, Boston, MA, United States
推荐引用方式 GB/T 7714	Wong A.Y.H.,Geddes J.A.. Examining the competing effects of contemporary land management vs. land cover changes on global air quality[J],2021,21(21).
APA	Wong A.Y.H.,&Geddes J.A..(2021).Examining the competing effects of contemporary land management vs. land cover changes on global air quality.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(21).
MLA	Wong A.Y.H.,et al."Examining the competing effects of contemporary land management vs. land cover changes on global air quality".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.21(2021).