气候变化领域集成服务门户(CCPortal): Changes in biomass burning, wetland extent, or agriculture drive atmospheric NH3 trends in select African regions

CCPortal

DOI	10.5194/acp-21-16277-2021
	Changes in biomass burning, wetland extent, or agriculture drive atmospheric NH3 trends in select African regions
	Hickman J.E.; Andela N.; Dammers E.; Clarisse L.; Coheur P.-F.; Van Damme M.; Di Vittorio C.A.; Ossohou M.; Galy-Lacaux C.; Tsigaridis K.; Bauer S.E.
发表日期	2021
ISSN	1680-7316
起始页码	16277
结束页码	16291
卷号	21 期号:21
英文摘要	Atmospheric ammonia (NH3) is a precursor to fine particulate matter and a source of nitrogen (N) deposition that can adversely affect ecosystem health. The main sources of NH3 - agriculture and biomass burning - are undergoing are or expected to undergo substantial changes in Africa. Although evidence of increasing NH3 over parts of Africa has been observed, the mechanisms behind these trends are not well understood. Here we use observations of atmospheric NH3 vertical column densities (VCDs) from the Infrared Atmospheric Sounding Interferometer (IASI) along with other satellite observations of the land surface and atmosphere to evaluate how NH3 concentrations have changed over Africa from 2008 through 2018, and what has caused those changes. In West Africa NH3 VCDs are observed to increase during the late dry season, with increases of over 6 % yr-1 in Nigeria during February and March (p<0.01). These positive trends are associated with increasing burned area and CO trends during these months, likely related to agricultural preparation. Increases are also observed in the Lake Victoria basin region, where they are associated with expanding agricultural area. In contrast, NH3 VCDs declined over the Sudd wetlands in South Sudan by over 1.5 % yr-1, though not significantly (pCombining double low line0.28). Annual maxima in NH3 VCDs in South Sudan occur during February through May and are associated with the drying of temporarily flooded wetland soils, which favor emissions of NH3. The change in mean NH3 VCDs over the Sudd is strongly correlated with variation in wetland extent in the Sudd: in years when more area remained flooded during the dry season, NH3 VCDs were lower (rCombining double low line0.64, p<0.05). Relationships between biomass burning and NH3 may be observed when evaluating national-scale statistics: countries with the highest rates of increasing NH3 VCDs also had high rates of growth in CO VCDs; burned area displayed a similar pattern, though not significantly. Livestock numbers were also higher in countries with intermediate or high rates of NH3 VCD growth. Fertilizer use in Africa is currently low but growing; implementing practices that can limit NH3 losses from fertilizer as agriculture is intensified may help mitigate impacts on health and ecosystems. ©
语种	英语
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/246439
作者单位	NASA Goddard Institute for Space Studies, New York, United States; NASA Goddard Space Flight Center, Greenbelt, United States; Climate Air and Sustainability, Netherlands Organisation for Applied Scientific Research (TNO), Utrecht, Netherlands; Atmospheric Spectroscopy, Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles (ULB), Brussels, Belgium; Department of Engineering, Wake Forest University, Winston-Salem, United States; Laboratoire des Sciences de la Matière de l'Environnement et de l'Energie Solaire, Université Félix Houphouët-Boigny, Abidjan, Cote d'Ivoire; Laboratoire d'Aérologie, Université Toulouse III Paul Sabatier, CNRS, Toulouse, France; Center for Climate Systems Research, Columbia University, New York, United States
推荐引用方式 GB/T 7714	Hickman J.E.,Andela N.,Dammers E.,et al. Changes in biomass burning, wetland extent, or agriculture drive atmospheric NH3 trends in select African regions[J],2021,21(21).
APA	Hickman J.E..,Andela N..,Dammers E..,Clarisse L..,Coheur P.-F..,...&Bauer S.E..(2021).Changes in biomass burning, wetland extent, or agriculture drive atmospheric NH3 trends in select African regions.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(21).
MLA	Hickman J.E.,et al."Changes in biomass burning, wetland extent, or agriculture drive atmospheric NH3 trends in select African regions".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.21(2021).