气候变化领域集成服务门户(CCPortal): Variability of hydroxyl radical (OH) reactivity in the Landes maritime pine forest: Results from the LANDEX campaign 2017

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DOI	10.5194/acp-20-1277-2020
	Variability of hydroxyl radical (OH) reactivity in the Landes maritime pine forest: Results from the LANDEX campaign 2017
	Bsaibes S.; Al Ajami M.; Mermet K.; Truong F.; Batut S.; Hecquet C.; Dusanter S.; Léornadis T.; Sauvage S.; Kammer J.; Flaud P.-M.; Perraudin E.; Villenave E.; Locoge N.; Gros V.; Schoemaecker C.
发表日期	2020
ISSN	1680-7316
起始页码	1277
结束页码	1300
卷号	20 期号:3
英文摘要	Total hydroxyl radical (OH) reactivity measurements were conducted during the LANDEX intensive field campaign in a coniferous temperate forest located in the Landes area, southwestern France, during July 2017. In order to investigate inter-canopy and intra-canopy variability, measurements were performed inside (6 m) and above the canopy level (12 m), as well as at two different locations within the canopy, using a comparative reactivity method (CRM) and a laser photolysis-laser-induced fluorescence (LP-LIF) instrument. The two techniques were intercompared at the end of the campaign by performing measurements at the same location. Volatile organic compounds were also monitored at both levels with a proton transfer time-of-flight mass spectrometer and online gas chromatography instruments to evaluate their contribution to total OH reactivity, with monoterpenes being the main reactive species emitted in this forest dominated by Pinus pinaster Aiton. Total OH reactivity varied diurnally, following the trend of biogenic volatile organic compounds (BVOCs), the emissions and concentrations of which were dependent on meteorological parameters. Average OH reactivity was around 19.2 and 16.5 s-1 inside and above the canopy, respectively. The highest levels of total OH reactivity were observed during nights with a low turbulence (u∗ = 0:2 m s-1), leading to lower mixing of emitted species within the canopy and thus an important vertical stratification characterized by a strong concentration gradient. Comparing the measured and the calculated OH reactivity highlighted an average missing OH reactivity of 22 % and 33 % inside and above the canopy, respectively. A day-night variability was observed on missing OH reactivity at both heights. Investigations showed that during daytime, missing OH sinks could be due to primary emissions and secondary products linked to a temperature-enhanced photochemistry. Regarding nighttime missing OH reactivity, higher levels were seen for the stable and warm night of 4-5 July, showing that these conditions could have been favorable for the accumulation of long-lived species (primary and secondary species) during the transport of the air mass from nearby forests. © 2020 Author(s).
语种	英语
scopus关键词	atmospheric chemistry; biogenic emission; canopy architecture; concentration (composition); coniferous forest; hydroxyl radical; volatile organic compound; France; Landes; Nouvelle-Aquitaine; Pinus pinaster
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/141570
作者单位	Laboratoire des Sciences du Climat et de l'Environnement, LSCE, UMR CNRS-CEA-UVSQ, Gif-sur-Yvette, 91191, France; Laboratoire PhysicoChimie des Processus de Combustion et de l'Atmosphère, PC2A, UMR 8522, Villeneuve d'Ascq, 59655, France; IMT Lille Douai, Univ. Lille - SAGE, Département Sciences de l'Atmosphère et Génie de l'Environnement, Lille, 59000, France; Univ. Bordeaux, EPOC, UMR 5805, Talence Cedex, 33405, France; CNRS, EPOC, UMR 5805, Talence Cedex, 33405, France; Department of Chemistry and Environmental Research Institute, University College Cork, Cork, Ireland
推荐引用方式 GB/T 7714	Bsaibes S.,Al Ajami M.,Mermet K.,et al. Variability of hydroxyl radical (OH) reactivity in the Landes maritime pine forest: Results from the LANDEX campaign 2017[J],2020,20(3).
APA	Bsaibes S..,Al Ajami M..,Mermet K..,Truong F..,Batut S..,...&Schoemaecker C..(2020).Variability of hydroxyl radical (OH) reactivity in the Landes maritime pine forest: Results from the LANDEX campaign 2017.Atmospheric Chemistry and Physics,20(3).
MLA	Bsaibes S.,et al."Variability of hydroxyl radical (OH) reactivity in the Landes maritime pine forest: Results from the LANDEX campaign 2017".Atmospheric Chemistry and Physics 20.3(2020).