气候变化领域集成服务门户(CCPortal): Measurements and modeling of snow albedo at Alerce Glacier, Argentina: Effects of volcanic ash, snow grain size, and cloudiness

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DOI	10.5194/tc-14-4581-2020
	Measurements and modeling of snow albedo at Alerce Glacier, Argentina: Effects of volcanic ash, snow grain size, and cloudiness
	Constantin J.G.; Ruiz L.; Villarosa G.; Outes V.; Bajano F.N.; He C.; Bajano H.; Dawidowski L.
发表日期	2020
ISSN	19940416
起始页码	4581
结束页码	4601
卷号	14 期号:12
英文摘要	The impact of volcanic ash on seasonal snow and glacier mass balance has been much less studied than that of carbonaceous particles and mineral dust. We present here the first field measurements on the Argentinian Andes, combined with snow albedo and glacier mass balance modeling. Measured impurity content (1.1 mg kg-1 to 30 000 mg kg-1) varied abruptly in snow pits and snow and firn cores, due to high surface enrichment during the ablation season and possibly local or regional wind-driven resuspension and redeposition of dust and volcanic ash. In addition, we observed high spatial heterogeneity, due to glacier topography and the prevailing wind direction. Microscopic characterization showed that the major component was ash from recent Calbuco (2015) and Cordón Caulle (2011) volcanic eruptions, with a minor presence of mineral dust and black carbon. We also found a wide range of measured snow albedo (0.26 to 0.81), which reflected mainly the impurity content and the snow and firn grain size (due to aging). We updated the SNow, ICe, and Aerosol Radiation (SNICAR) albedo model to account for the effect of cloudiness on incident radiation spectra, improving the match of modeled and measured values. We also ran sensitivity studies considering the uncertainty in the main measured parameters (impurity content and composition, snow grain size, layer thickness, etc.) to identify the field measurements that should be improved to facilitate the validation of the snow albedo model. Finally, we studied the impact of these albedo reductions on Alerce Glacier using a spatially distributed surface mass balance model. We found a large impact of albedo changes on glacier mass balance, and we estimated that the effect of observed ash concentrations can be as high as a 1.25 m water equivalent decrease in the annual surface mass balance (due to a 34 % increase in the melt during the ablation season). © 2020 Copernicus GmbH. All rights reserved.
英文关键词	ablation; albedo; cloud cover; concentration (composition); glacier mass balance; grain size; mass balance; model validation; numerical model; volcanic ash; Alerce; Andes; Argentina; Chile; Los Lagos
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202053
作者单位	División de Química Atmosférica, Gerencia de Química, Comisión Nacional de Energiá Atómica, Av General Paz 1499, San Martin, Buenos Aires, B1650KNA, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina; IANIGLA, Gobierno de Mendoza, Universidad Nacional de Cuyo, CONICET, CCT-Mendoza, Mendoza, Argentina; Instituto Andino Patagónico de Tecnologiás Biológicas y Geoambientales (IPATEC), CONICET-UNCo, Bariloche, Argentina; Departamento de Geologiá y Petróleo, Centro Regional Universitario Bariloche, Universidad Nacional Del Comahue, Bariloche, Argentina; Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Constantin J.G.,Ruiz L.,Villarosa G.,et al. Measurements and modeling of snow albedo at Alerce Glacier, Argentina: Effects of volcanic ash, snow grain size, and cloudiness[J],2020,14(12).
APA	Constantin J.G..,Ruiz L..,Villarosa G..,Outes V..,Bajano F.N..,...&Dawidowski L..(2020).Measurements and modeling of snow albedo at Alerce Glacier, Argentina: Effects of volcanic ash, snow grain size, and cloudiness.Cryosphere,14(12).
MLA	Constantin J.G.,et al."Measurements and modeling of snow albedo at Alerce Glacier, Argentina: Effects of volcanic ash, snow grain size, and cloudiness".Cryosphere 14.12(2020).