气候变化领域集成服务门户(CCPortal): Total OH reactivity over the Amazon rainforest: Variability with temperature, wind, rain, altitude, time of day, season, and an overall budget closure

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DOI	10.5194/acp-21-6231-2021
	Total OH reactivity over the Amazon rainforest: Variability with temperature, wind, rain, altitude, time of day, season, and an overall budget closure
	Pfannerstill E.Y.; Reijrink N.G.; Edtbauer A.; Ringsdorf A.; Zannoni N.; Araújo A.; Ditas F.; Holanda B.A.; Sá M.O.; Tsokankunku A.; Walter D.; Wolff S.; Lavri J.V.; Pöhlker C.; Sörgel M.; Williams J.
发表日期	2021
ISSN	1680-7316
起始页码	6231
结束页码	6256
卷号	21 期号:8
英文摘要	The tropical forests are Earth's largest source of biogenic volatile organic compounds (BVOCs) and thus also the largest atmospheric sink region for the hydroxyl radical (OH). However, the OH sink above tropical forests is poorly understood, as past studies have revealed large unattributed fractions of total OH reactivity. We present the first total OH reactivity and volatile organic compound (VOC) measurements made at the Amazon Tall Tower Observatory (ATTO) at 80, 150, and 320 m above ground level, covering two dry seasons, one wet season, and one transition season in 2018-2019. By considering a wide range of previously unaccounted for VOCs, which we identified by proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS), the unattributed fraction was with an overall average of 19 % within the measurement uncertainty of span classCombining double low line"inline-formula"g1/4/span 35 %. In terms of seasonal average OH reactivity, isoprene accounted for 23 %-43 % of the total and oxygenated VOCs (OVOCs) for 22 %-40 %, while monoterpenes, sesquiterpenes, and green leaf volatiles combined were responsible for 9 %-14 %. These findings show that OVOCs were until now an underestimated contributor to the OH sink above the Amazon forest./ By day, total OH reactivity decreased towards higher altitudes with strongest vertical gradients observed around noon during the dry season (span classCombining double low lineinline-formula-0.026/span sspan classCombining double low line"inline-formula-1/span mspan classCombining double low line"inline-formula-1/span), while the gradient was inverted at night. Seasonal differences in total OH reactivity were observed, with the lowest daytime average and standard deviation of 19.9 span classCombining double low lineinline-formula±/span 6.2 sspan classCombining double low lineinline-formula-1/span during a wet-dry transition season with frequent precipitation; 23.7 span classCombining double low line"inline-formula"±/span 6.5 sspan classCombining double low line"inline-formula"-1/span during the wet season; and the highest average OH reactivities during two dry-season observation periods with 28.1 span classCombining double low line"inline-formula"±/span 7.9 sspan classCombining double low line"inline-formula"-1/span and 29.1 span classCombining double low line"inline-formula"±/span 10.8 sspan classCombining double low line"inline-formula"-1/span, respectively. The effects of different environmental parameters on the OH sink were investigated, and quantified, where possible. Precipitation caused short-Term spikes in total OH reactivity, which were followed by below-normal OH reactivity for several hours. Biomass burning increased total OH reactivity by 2.7 to 9.5 sspan classCombining double low line"inline-formula"-1/span. We present a temperature-dependent parameterization of OH reactivity that could be applied in future models of the OH sink to further reduce our knowledge gaps in tropical-forest OH chemistry./. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	atmospheric chemistry; biomass burning; hydroxyl radical; rainfall; rainforest; seasonal variation; temperature effect; tropical forest; volatile organic compound; wind field; Amazonia; Elliptio dilatata
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/246946
作者单位	Atmospheric Chemistry and Multiphase Chemistry Departments, Max Planck Institute for Chemistry, Mainz, 55128, Germany; Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), IMT Lille Douai, Douai, 59508, France; Empresa Brasileira de Pesquisa Agropecuária (Embrapa) Amazonia Oriental, CEP 66095-100, Belém, Brazil; Instituto Nacional de Pesquisas da Amazonia (INPA), CEP 69067-375, Manaus, Brazil; Biogeochemical Processes Department, Max Planck Institute for Biogeochemistry, Jena, 07745, Germany; Environment and Water Research Center, Cyprus Institute, Nicosia, 1645, Cyprus; Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720, United States; Hessisches Landesamt für Naturschutz, Umwelt und Geologie, Wiesbaden, 65203, Germany
推荐引用方式 GB/T 7714	Pfannerstill E.Y.,Reijrink N.G.,Edtbauer A.,et al. Total OH reactivity over the Amazon rainforest: Variability with temperature, wind, rain, altitude, time of day, season, and an overall budget closure[J],2021,21(8).
APA	Pfannerstill E.Y..,Reijrink N.G..,Edtbauer A..,Ringsdorf A..,Zannoni N..,...&Williams J..(2021).Total OH reactivity over the Amazon rainforest: Variability with temperature, wind, rain, altitude, time of day, season, and an overall budget closure.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(8).
MLA	Pfannerstill E.Y.,et al."Total OH reactivity over the Amazon rainforest: Variability with temperature, wind, rain, altitude, time of day, season, and an overall budget closure".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.8(2021).