气候变化领域集成服务门户(CCPortal): Mercury in the free troposphere and bidirectional atmosphere-vegetation exchanges - insights from Maido mountain observatory in the Southern Hemisphere tropics

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DOI	10.5194/acp-23-1309-2023
	Mercury in the free troposphere and bidirectional atmosphere-vegetation exchanges - insights from Maido mountain observatory in the Southern Hemisphere tropics
	Koenig, Alkuin M.; Magand, Olivier; Verreyken, Bert; Brioude, Jerome; Amelynck, Crist; Schoon, Niels; Colomb, Aurelie; Araujo, Beatriz Ferreira; Ramonet, Michel; Sha, Mahesh K.; Cammas, Jean-Pierre; Sonke, Jeroen E.; Dommergue, Aurelien
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	1309
结束页码	1328
卷号	23 期号:2 页码:20
英文摘要	Atmospheric mercury (Hg) observations in the lower free troposphere (LFT) can give important insights into Hg redox chemistry and can help constrain Hg background concentrations on a regional level. Relatively continuous sampling of LFT air, inaccessible to most ground-based stations, can be achieved at highaltitude observatories. However, such high-altitude observatories are rare, especially in the Southern Hemisphere (SH), and atmospheric Hg in the SH LFT is unconstrained. To fill this gap, we continuously measured gaseous elemental mercury (GEM; hourly) and reactive mercury (RM; integrated over similar to 6-14 d) for 9 months at Maido mountain observatory (2160ma.s.l.) on remote Reunion Island (21.1 degrees S, 55.5 degrees E) in the tropical Indian Ocean. GEM exhibits a marked diurnal variation characterized by a midday peak (mean: 0.95 ngm(-3); SD: 0.08 ngm(-3)) and a nighttime low (mean: 0.78 ngm(-3); SD: 0.11 ngm(-3)). We find that this diurnal variation is likely driven by the interplay of important GEM photo-reemission from the islands' vegetated surfaces (i.e. vegetation C soil) during daylight hours (8-22 ngm(-2) h(-1)), boundary layer influences during the day, and predominant LFT influences at night. We estimate GEM in the LFT based on nighttime observations in particularly dry air masses and find a notable seasonal variation, with LFT GEM being lowest from December to March (mean 0.66 ngm 3; SD: 0.07 ngm 3) and highest from September to November (mean: 0.79 ng m(-3); SD: 0.09 ng m(-3)). Such a clear GEM seasonality contrasts with the weak seasonal variation reported for the SH marine boundary layer but is in line with modeling results, highlighting the added value of continuous Hg observations in the LFT. Maido RM is 10.6 pg m(-3) (SD: 5.9 pg m(-3)) on average, but RM in the cloud-free LFT might be about twice as high, as weekly-biweekly sampled RM observations are likely diluted by low-RM contributions from the boundary layer and clouds.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000928208800001
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/273603
作者单位	Centre National de la Recherche Scientifique (CNRS); Communaute Universite Grenoble Alpes; Institut National Polytechnique de Grenoble; UDICE-French Research Universities; Universite Grenoble Alpes (UGA); INRAE; Institut de Recherche pour le Developpement (IRD); Ghent University; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Meteo France; University of La Reunion; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Universite Clermont Auvergne (UCA); Centre National de la Recherche Scientifique (CNRS); Institut de Recherche pour le Developpement (IRD); Universite de Toulouse; Universite Toulouse III - Paul Sabatier; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); UDICE-French Research Universities; Universite Paris Saclay; CEA; Centre National de la Recherche Scientifique (CNRS); Meteo France; Univers...
推荐引用方式 GB/T 7714	Koenig, Alkuin M.,Magand, Olivier,Verreyken, Bert,et al. Mercury in the free troposphere and bidirectional atmosphere-vegetation exchanges - insights from Maido mountain observatory in the Southern Hemisphere tropics[J],2023,23(2):20.
APA	Koenig, Alkuin M..,Magand, Olivier.,Verreyken, Bert.,Brioude, Jerome.,Amelynck, Crist.,...&Dommergue, Aurelien.(2023).Mercury in the free troposphere and bidirectional atmosphere-vegetation exchanges - insights from Maido mountain observatory in the Southern Hemisphere tropics.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(2),20.
MLA	Koenig, Alkuin M.,et al."Mercury in the free troposphere and bidirectional atmosphere-vegetation exchanges - insights from Maido mountain observatory in the Southern Hemisphere tropics".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.2(2023):20.