globalchange  > 气候变化与战略
DOI: 10.5194/tc-14-4581-2020
论文题名:
Measurements and modeling of snow albedo at Alerce Glacier, Argentina: Effects of volcanic ash, snow grain size, and cloudiness
作者: Constantin J.G.; Ruiz L.; Villarosa G.; Outes V.; Bajano F.N.; He C.; Bajano H.; Dawidowski L.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期:12
起始页码: 4581
结束页码: 4601
语种: 英语
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164431
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Cryosphere,2020-01-01,14(12)
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