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DOI | 10.5194/tc-13-1147-2019 |
Saharan dust events in the European Alps: Role in snowmelt and geochemical characterization | |
Di Mauro B.; Garzonio R.; Rossini M.; Filippa G.; Pogliotti P.; Galvagno M.; Morra Di Cella U.; Migliavacca M.; Baccolo G.; Clemenza M.; Delmonte B.; Maggi V.; Dumont M.; Tuzet F.; Lafaysse M.; Morin S.; Cremonese E.; Colombo R. | |
发表日期 | 2019 |
ISSN | 19940416 |
EISSN | 13 |
起始页码 | 1147 |
结束页码 | 1165 |
卷号 | 13期号:4 |
英文摘要 | The input of mineral dust from arid regions impacts snow optical properties. The induced albedo reduction generally alters the melting dynamics of the snowpack, resulting in earlier snowmelt. In this paper, we evaluate the impact of dust depositions on the melting dynamics of snowpack at a high-elevation site (2160 m) in the European Alps (Torgnon, Aosta Valley, Italy) during three hydrological years (2013-2016). These years were characterized by several Saharan dust events that deposited significant amounts of mineral dust in the European Alps. We quantify the shortening of the snow season due to dust deposition by comparing observed snow depths and those simulated with the Crocus model accounting, or not, for the impact of impurities. The model was run and tested using meteorological data from an automated weather station. We propose the use of repeated digital images for tracking dust deposition and resurfacing in the snowpack. The good agreement between model prediction and digital images allowed us to propose the use of an RGB index (i.e. snow darkening index - SDI) for monitoring dust on snow using images from a digital camera. We also present a geochemical characterization of dust reaching the Alpine chain during spring in 2014. Elements found in dust were classified as a function of their origin and compared with Saharan sources. A strong enrichment in Fe was observed in snow containing Saharan dust. In our case study, the comparison between modelling results and observations showed that impurities deposited in snow anticipated the disappearance of snow up to 38 d a out of a total 7 months of typical snow duration. This happened for the season 2015-2016 that was characterized by a strong dust deposition event. During the other seasons considered here (2013-2014 and 2014-2015), the snow melt-out date was 18 and 11 d earlier, respectively. We conclude that the effect of the Saharan dust is expected to reduce snow cover duration through the snow-albedo feedback. This process is known to have a series of further hydrological and phenological feedback effects that should be characterized in future research. © Author(s) 2019. |
学科领域 | albedo; atmospheric deposition; climate variation; dust storm; geochemical survey; mineral dust; snow cover; snowmelt; snowpack; tracking; Alps; Italy; Valle d'Aosta; Crocus |
语种 | 英语 |
scopus关键词 | albedo; atmospheric deposition; climate variation; dust storm; geochemical survey; mineral dust; snow cover; snowmelt; snowpack; tracking; Alps; Italy; Valle d'Aosta; Crocus |
来源期刊 | The Cryosphere |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/118897 |
作者单位 | Earth and Environmental Sciences Department, University of Milano-Bicocca, Milan, 20126, Italy; Environmental Protection Agency of Aosta Valley, Aosta, Italy; Max Planck Institute for Biogeochemistry, Jena, Germany; National Institute of Nuclear Physics (INFN), University of Milano-Bicocca, Milan, 20126, Italy; Department of Physics Giuseppe Occhialini, University of Milano-Bicocca, Milan, 20126, Italy; Université Grenoble Alpes, Université de Toulouse, Météo-France, CNRS, CNRM, Centre d'Etudes de la Neige, Grenoble, France; UGA/CNRS, Institut des Géosciences de l'Environnement (IGE), SaintMartin d'Hères, France |
推荐引用方式 GB/T 7714 | Di Mauro B.,Garzonio R.,Rossini M.,et al. Saharan dust events in the European Alps: Role in snowmelt and geochemical characterization[J],2019,13(4). |
APA | Di Mauro B..,Garzonio R..,Rossini M..,Filippa G..,Pogliotti P..,...&Colombo R..(2019).Saharan dust events in the European Alps: Role in snowmelt and geochemical characterization.The Cryosphere,13(4). |
MLA | Di Mauro B.,et al."Saharan dust events in the European Alps: Role in snowmelt and geochemical characterization".The Cryosphere 13.4(2019). |
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