气候变化领域集成服务门户(CCPortal): Insights into tropical cloud chemistry in Reunion (Indian Ocean): results from the BIO-MAiDO campaign

CCPortal

DOI	10.5194/acp-22-505-2022
	Insights into tropical cloud chemistry in Reunion (Indian Ocean): results from the BIO-MAiDO campaign
	Dominutti, Pamela A.; Renard, Pascal; Vaitilingom, Mickael; Bianco, Angelica; Baray, Jean-Luc; Borbon, Agnes; Bourianne, Thierry; Burnet, Frederic; Colomb, Aurelie; Delort, Anne-Marie; Duflot, Valentin; Houdier, Stephan; Jaffrezo, Jean-Luc; Joly, Muriel; Leremboure, Martin; Metzger, Jean-Marc; Pichon, Jean-Marc; Ribeiro, Mickael; Rocco, Manon; Tulet, Pierre; Vella, Anthony; Leriche, Maud; Deguillaume, Laurent
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	505
结束页码	533
卷号	22 期号:1 页码:29
英文摘要	We present here the results obtained during an intensive field campaign conducted in the framework of the French BIO-MAiDO (Bio-physico-chemistry of tropical clouds at Maido (Reunion Island): processes and impacts on secondary organic aerosols' formation) project. This study integrates an exhaustive chemical and microphysical characterization of cloud water obtained in March-April 2019 in Reunion (Indian Ocean). Fourteen cloud samples have been collected along the slope of this mountainous island. Comprehensive chemical characterization of these samples is performed, including inorganic ions, metals, oxidants, and organic matter (organic acids, sugars, amino acids, carbonyls, and low-solubility volatile organic compounds, VOCs). Cloud water presents high molecular complexity with elevated water-soluble organic matter content partly modulated by microphysical cloud properties. As expected, our findings show the presence of compounds of marine origin in cloud water samples (e.g. chloride, sodium) demonstrating ocean-cloud exchanges. Indeed, Na+ and Cl- dominate the inorganic composition contributing to 30 % and 27 %, respectively, to the average total ion content. The strong correlations between these species (r(2) = 0.87, p value: < 0.0001) suggest similar air mass origins. However, the average molar Cl-/Na+ ratio (0.85) is lower than the sea-salt one, reflecting a chloride depletion possibly associated with strong acids such as HNO3 and H2SO4. Additionally, the non-sea-salt fraction of sulfate varies between 38 % and 91 %, indicating the presence of other sources. Also, the presence of amino acids and for the first time in cloud waters of sugars clearly indicates that biological activities contribute to the cloud water chemical composition. A significant variability between events is observed in the dissolved organic content (25.5 +/- 18.4 mgCL-1), with levels reaching up to 62 mgCL(-1). This variability was not similar for all the measured compounds, suggesting the presence of dissimilar emission sources or production mechanisms. For that, a statistical analysis is performed based on back-trajectory calculations using the CAT (Computing Atmospheric Trajectory Tool) model associated with the land cover registry. These investigations reveal that air mass origins and microphysical variables do not fully explain the variability observed in cloud chemical composition, highlighting the complexity of emission sources, multiphasic transfer, and chemical processing in clouds. Even though a minor contribution of VOCs (oxygenated and low-solubility VOCs) to the total dissolved organic carbon (DOC) (0.62 % and 0.06 %, respectively) has been observed, significant levels of biogenic VOC (20 to 180 nmolL(-1)) were detected in the aqueous phase, indicating the cloud-terrestrial vegetation exchange. Cloud scavenging of VOCs is assessed by measurements obtained in both the gas and aqueous phases and deduced experimental gas-/aqueous-phase partitioning was compared with Henry's law equilibrium to evaluate potential supersaturation or unsaturation conditions. The evaluation reveals the supersaturation of low-solubility VOCs from both natural and anthropogenic sources. Our results depict even higher supersaturation of terpenoids, evidencing a deviation from thermodynamically expected partitioning in the aqueous-phase chemistry in this highly impacted tropical area.
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:000746440500001
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/273899
作者单位	Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Universite Clermont Auvergne (UCA); Universite des Antilles; Centre National de la Recherche Scientifique (CNRS); Universite Clermont Auvergne (UCA); Centre National de la Recherche Scientifique (CNRS); Universite de Toulouse; Centre National de la Recherche Scientifique (CNRS); Universite Clermont Auvergne (UCA); Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); University of La Reunion; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Communaute Universite Grenoble Alpes; UDICE-French Research Universities; Universite Grenoble Alpes (UGA); Institut de Recherche pour le Developpement (IRD); Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Institut de Recherche pour le Developpement (IRD...
推荐引用方式 GB/T 7714	Dominutti, Pamela A.,Renard, Pascal,Vaitilingom, Mickael,et al. Insights into tropical cloud chemistry in Reunion (Indian Ocean): results from the BIO-MAiDO campaign[J],2022,22(1):29.
APA	Dominutti, Pamela A..,Renard, Pascal.,Vaitilingom, Mickael.,Bianco, Angelica.,Baray, Jean-Luc.,...&Deguillaume, Laurent.(2022).Insights into tropical cloud chemistry in Reunion (Indian Ocean): results from the BIO-MAiDO campaign.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(1),29.
MLA	Dominutti, Pamela A.,et al."Insights into tropical cloud chemistry in Reunion (Indian Ocean): results from the BIO-MAiDO campaign".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.1(2022):29.