DOI: 10.1016/j.atmosenv.2020.117618
论文题名: Atmospheric formaldehyde at El Teide and Pic du Midi remote high-altitude sites
作者: Prados-Roman C. ; Fernández M. ; Gómez-Martín L. ; Cuevas E. ; Gil-Ojeda M. ; Marusczak N. ; Puentedura O. ; Sonke J.E. ; Saiz-Lopez A.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 234 语种: 英语
英文关键词: 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
学科: Formaldehyde
; Free troposphere
; Ground-based observations
; Remote sensing
; Volatile organic compounds
中文摘要: 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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160273
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Prados-Roman C.,Fernández M.,Gómez-Martín L.,et al. Atmospheric formaldehyde at El Teide and Pic du Midi remote high-altitude sites[J]. Atmospheric Environment,2020-01-01,234