气候变化领域集成服务门户(CCPortal): Atmospheric formaldehyde at El Teide and Pic du Midi remote high-altitude sites

CCPortal

DOI	10.1016/j.atmosenv.2020.117618
	Atmospheric formaldehyde at El Teide and Pic du Midi remote high-altitude sites
	Prados-Roman C.; Fernández M.; Gómez-Martín L.; Cuevas E.; Gil-Ojeda M.; Marusczak N.; Puentedura O.; Sonke J.E.; Saiz-Lopez A.
发表日期	2020
ISSN	1352-2310
卷号	234
英文摘要	Formaldehyde (CH2O) is a tracer of the photochemical activity of the atmosphere. Linked to air quality, CH2O is an ozone (O3) precursor and serves as a proxy for natural and anthropogenic reactive organic emissions. As a product of the photooxidation of methane (CH4) and other hydrocarbons (e.g., isoprene), CH2O represents an important source of radicals in the remote free troposphere. This work aims at improving the characterization of this part of the troposphere where data are scarce. In particular, this study assesses the presence of CH2O at two high-altitude remote sites: El Teide (TEI, 3570 m a.s.l., Tenerife, Canary Islands, Spain) and Pic du Midi (PDM, 2877 m a.s.l., French Pyrenees). Through ground-based remote sensing measurements performed during two field campaigns in July (TEI) and September (PDM) 2013, this study presents the vertical distribution of CH2O at both locations. Results at PDM show that CH2O mixing ratios follow a decreasing vertical profile with a mean maximum of 0.5 ± 0.2 nmol mol−1 (i.e., ppbv) at the instruments' altitude. At TEI, observations indicate an uplifted layer of CH2O with a mean maximum of 1.3 ± 0.3 nmol mol−1 at 3.8 km a.s.l. (i.e., 300 m above the instrument's altitude). At both remote sites, the observed CH2O levels are higher than expected for background methane oxidation (a threefold increase in the case of TEI). Air mass back trajectory analysis links CH2O observations with abundant natural (e.g. forests) and/or anthropogenic isoprene emissions from the region nearby PDM, while the high CH2O levels detected at TEI indicate in-plume formation of CH2O resulting from its precursors emitted from west-African and Canadian fires. Finally, as a key trace gas for O3 and HOx chemistries, we estimate the upper limit of bromine monoxide (BrO) in the free troposphere at TEI and PDM to be 0.8 and 1.5 pmol mol−1 (i.e., pptv) respectively. © 2020 Elsevier Ltd
英文关键词	Formaldehyde; Free troposphere; Ground-based observations; Remote sensing; Volatile organic compounds
语种	英语
scopus关键词	Air quality; Formaldehyde; Isoprene; Methane; Photooxidation; Remote sensing; Troposphere; Air mass back trajectories; Atmospheric formaldehyde; Ground-based remote sensing; High altitude sites; Isoprene emission; Organic emissions; Photochemical activity; Vertical distributions; Bromine compounds; bromine; formaldehyde; isoprene; methane; anthropogenic source; bromine; formaldehyde; methane; photochemistry; photooxidation; remote sensing; troposphere; vertical distribution; vertical profile; altitude; Article; atmosphere; Canadian; chemical composition; clinical assessment; exhaust gas; limit of detection; oxidation kinetics; plume; priority journal; remote sensing; troposphere; West African; Canary Islands; Haute Pyrenees; Pic du Midi; Pyrenees; Santa Cruz de Tenerife [(PRV) Canary Islands]; Spain; Teide; Tenerife; Tenerife
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129436
作者单位	Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano (CSIC), Madrid, 28006, Spain; Atmospheric Research and Instrumentation Branch, National Institute for Aerospace Technology (INTA), Madrid, 28850, Spain; Izaña Atmospheric Research Center (AEMET), Santa Cruz de Tenerife, 38001, Spain; Observatoire Midi-Pyrénées, Laboratoire Géosciences Environnement Toulouse, CNRS/IRD/Université de Toulouse, Toulouse, 31400, France
推荐引用方式 GB/T 7714	Prados-Roman C.,Fernández M.,Gómez-Martín L.,et al. Atmospheric formaldehyde at El Teide and Pic du Midi remote high-altitude sites[J],2020,234.
APA	Prados-Roman C..,Fernández M..,Gómez-Martín L..,Cuevas E..,Gil-Ojeda M..,...&Saiz-Lopez A..(2020).Atmospheric formaldehyde at El Teide and Pic du Midi remote high-altitude sites.Atmospheric Environment,234.
MLA	Prados-Roman C.,et al."Atmospheric formaldehyde at El Teide and Pic du Midi remote high-altitude sites".Atmospheric Environment 234(2020).