气候变化领域集成服务门户(CCPortal): Investigation of several proxies to estimate sulfuric acid concentration under volcanic plume conditions

CCPortal

DOI	10.5194/acp-21-4541-2021
	Investigation of several proxies to estimate sulfuric acid concentration under volcanic plume conditions
	Rose C.; Rissanen M.P.; Iyer S.; Duplissy J.; Yan C.; Nowak J.B.; Colomb A.; Dupuy R.; He X.-C.; Lampilahti J.; Tham Y.J.; Wimmer D.; Metzger J.-M.; Tulet P.; Brioude J.; Planche C.; Kulmala M.; Sellegri K.
发表日期	2021
ISSN	1680-7316
起始页码	4541
结束页码	4560
卷号	21 期号:6
英文摘要	Sulfuric acid (H2SO4) is commonly accepted as a key precursor for atmospheric new particle formation (NPF). However, direct measurements of [H2SO4] remain challenging, thereby preventing the determination of this important quantity, and, consequently, a complete understanding of its contribution to the NPF process. Several proxies have been developed to bridge the gaps, but their ability to predict [H2SO4] under very specific conditions, such as those encountered in volcanic plumes (including, in particular, high sulfur dioxide mixing ratios), has not been evaluated so far. In this context, the main objective of the present study was to develop new proxies for daytime [H2SO4] under volcanic plume conditions and compare their performance to that of the proxies available in the literature. Specifically, the data collected at Maïdo during the OCTAVE (Oxygenated organic Compounds in the Tropical Atmosphere: variability and atmosphere-biosphere Exchanges) 2018 campaign, in the volcanic eruption plume of the Piton de la Fournaise, were first used to derive seven proxies based on knowledge of the sulfur dioxide (SO2) mixing ratio, global radiation, condensation sink (CS) and relative humidity (RH). A specific combination of some or all of these variables was tested in each of the seven proxies. In three of them (F1-F3), all considered variables were given equal weight in the prediction of [H2SO4], whereas adjusted powers were allowed (and determined during the fitting procedure) for the different variables in the other four proxies (A1-A4). Overall, proxies A1-A4 were found to perform better than proxies F1-F3, with, in particular, improved predictive ability for [H2SO4] > 2 × 108 cm-3. The CS was observed to play an important role in regulating [H2SO4], whereas the inclusion of RH did not improve the predictions. A last expression accounting for an additional sink term related to cluster formation, S1, was also tested and showed a very good predictive ability over the whole range of measured [H2SO4]. In a second step, the newly developed proxies were further evaluated using airborne measurements performed in the passive degassing plume of Etna during the STRAP (Synergie Transdisciplinaire pour Répondre aux Aléas liés aux Panaches volcaniques) 2016 campaign. Increased correlations between observed and predicted [H2SO4] were obtained when the dependence of predicted [H2SO4] on the CS was the lowest and when the dependence on [SO2] was concurrently the highest. The best predictions were finally retrieved by the simple formulation of F2 (in which [SO2] and radiation alone were assumed to explain the variations in [H2SO4] with equal contributions), with a pre-factor adapted to the STRAP data. All in all, our results illustrate the fairly good capacity of the proxies available in the literature to describe [H2SO4] under volcanic plume conditions, but they concurrently highlight the benefit of the newly developed proxies for the prediction of the highest concentrations ([H2SO4] > 2-3 × 108 cm-3). Moreover, the contrasting behaviours of the new proxies in the two investigated datasets indicate that in volcanic plumes, like in other environments, the relevance of a proxy can be affected by changes in environmental conditions and that location-specific coefficients do logically improve the predictions. © 2021 Author(s).
语种	英语
scopus关键词	comparative study; concentration (composition); condensation; mixing ratio; plume; relative humidity; sulfur dioxide; sulfuric acid; volcanic eruption; Mascarene Islands; Piton de la Fournaise; Reunion
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/247033
作者单位	Université Clermont Auvergne, Cnrs, Laboratoire de Météorologie Physique (LaMP), Clermont-Ferrand, 63000, France; Aerosol Physics Laboratory, Physics Unit, Tampere University, Tampere, Finland; Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland; Helsinki Institute of Physics, University of Helsinki, Helsinki, Finland; Chemistry and Dynamics Branch, Nasa Langley Research Center, Hampton, VA 23681, United States; Observatoire des Sciences de l'Univers de la Réunion, Ums 3365 (CNRS, Université de la Réunion, Météo-France), Saint-Denis, Réunion, 97744, France; LACy, Laboratoire de l'Atmosphère et des Cyclones, UMR8105 (CNRS, Université de la Réunion, Météo-France), Saint-Denis, Réunion, 97744, France
推荐引用方式 GB/T 7714	Rose C.,Rissanen M.P.,Iyer S.,et al. Investigation of several proxies to estimate sulfuric acid concentration under volcanic plume conditions[J],2021,21(6).
APA	Rose C..,Rissanen M.P..,Iyer S..,Duplissy J..,Yan C..,...&Sellegri K..(2021).Investigation of several proxies to estimate sulfuric acid concentration under volcanic plume conditions.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(6).
MLA	Rose C.,et al."Investigation of several proxies to estimate sulfuric acid concentration under volcanic plume conditions".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.6(2021).