干旱区生态环境知识资源中心(Arid): Saharan dust events in the European Alps: role in snowmelt and geochemical characterization

Arid

DOI	10.5194/tc-13-1147-2019
	Saharan dust events in the European Alps: role in snowmelt and geochemical characterization
	Di Mauro, Biagio 1; Garzonio, Roberto 1; Rossini, Micol 1; Filippa, Gianluca 2; Pogliotti, Paolo 2; Galvagno, Marta 2; di Cella, Umberto Morra 2; Migliavacca, Mirco 3; Baccolo, Giovanni 1,4; Clemenza, Massimiliano 4,5; Delmonte, Barbara 1; Maggi, Valter 1; Dumont, Marie 6; Tuzet, Francois 6,7; Lafaysse, Matthieu 6; Morin, Samuel 6; Cremonese, Edoardo 2; Colombo, Roberto 1
通讯作者	Di Mauro, Biagio
来源期刊	CRYOSPHERE
ISSN	1994-0416
EISSN	1994-0424
出版年	2019
卷号	13 期号:4 页码:1147-1165
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.
类型	Article
语种	英语
国家	Italy ; Germany ; France
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000463865100001
WOS关键词	LIGHT-ABSORBING IMPURITIES ; MINERAL-DUST ; DESERT DUST ; BLACK CARBON ; RADIATIVE PROPERTIES ; CHEMICAL-COMPOSITION ; TEMPORAL VARIATIONS ; OPTICAL-PROPERTIES ; SURFACE ALBEDO ; FRENCH ALPS
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215003
作者单位	1.Univ Milano Bicocca, Earth & Environm Sci Dept, I-20126 Milan, Italy; 2.Environm Protect Agcy Aosta Valley, Aosta, Italy; 3.Max Planck Inst Biogeochem, Jena, Germany; 4.Univ Milano Bicocca, Natl Inst Nucl Phys INFN, I-20126 Milan, Italy; 5.Univ Milano Bicocca, Dept Phys Giuseppe Occhialini, I-20126 Milan, Italy; 6.Univ Grenoble Alpes, Univ Toulouse, Meteo France, CNRS,CNRM,Ctr Etud Neige, Grenoble, France; 7.UGA, CNRS, IGE, St Martin Dheres, France
推荐引用方式 GB/T 7714	Di Mauro, Biagio,Garzonio, Roberto,Rossini, Micol,et al. Saharan dust events in the European Alps: role in snowmelt and geochemical characterization[J],2019,13(4):1147-1165.
APA	Di Mauro, Biagio.,Garzonio, Roberto.,Rossini, Micol.,Filippa, Gianluca.,Pogliotti, Paolo.,...&Colombo, Roberto.(2019).Saharan dust events in the European Alps: role in snowmelt and geochemical characterization.CRYOSPHERE,13(4),1147-1165.
MLA	Di Mauro, Biagio,et al."Saharan dust events in the European Alps: role in snowmelt and geochemical characterization".CRYOSPHERE 13.4(2019):1147-1165.