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Snow Spectral Albedo at Summit, Greenland: Comparison Between in Situ Measurements and Numerical Simulations Using Measured Physical and Chemical Properties of the Snowpack : Volume 6, Issue 6 (11/12/2012)

By Carmagnola, C. M.

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Book Id: WPLBN0004022777
Format Type: PDF Article :
File Size: Pages 49
Reproduction Date: 2015

Title: Snow Spectral Albedo at Summit, Greenland: Comparison Between in Situ Measurements and Numerical Simulations Using Measured Physical and Chemical Properties of the Snowpack : Volume 6, Issue 6 (11/12/2012)  
Author: Carmagnola, C. M.
Volume: Vol. 6, Issue 6
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Wright, P., Bergin, M., Dumont, M., Morin, S., Carmagnola, C. M., Strellis, B.,...Domine, F. (2012). Snow Spectral Albedo at Summit, Greenland: Comparison Between in Situ Measurements and Numerical Simulations Using Measured Physical and Chemical Properties of the Snowpack : Volume 6, Issue 6 (11/12/2012). Retrieved from http://members.worldlibrary.net/


Description
Description: Météo-France – CNRS, CNRM – GAME URA 1357, Centre d'Etudes de la Neige, Grenoble, France. The albedo of surface snow is determined both by the near-surface profile of the physical and chemical properties of the snowpack and by the spectral and angular characteristics of the incident solar radiation. Simultaneous measurements of the physical and chemical properties of snow were carried out at Summit Camp, Greenland (72°36´ N, 38°25´ W, 3210 m a.s.l.) in May and June 2011, along with spectral albedo measurements. One of the main objectives of the field campaign was to test our ability to predict snow albedo comparing measured snow spectral albedo to the albedo calculated with a radiative transfer model. To achieve this goal, we made daily measurements of the snow spectral albedo in the range 350–2200 nm and recorded snow stratigraphic information down to roughly 80 cm. The snow specific surface area (SSA) was measured using the DUFISSS instrument (DUal Frequency Integrating Sphere for Snow SSA measurement, Gallet et al., 2009). Samples were also collected for chemical analyses including black carbon (BC) and trace elements, to evaluate the impact of light absorbing particulate matter in snow. This is one of the most comprehensive albedo-related data sets combining chemical analysis, snow physical properties and spectral albedo measurements obtained in a polar environment. The surface albedo was calculated from density, SSA, BC and dust profiles using the DISORT model (DIScrete Ordinate Radiative Transfer, Stamnes et al., 1988) and compared to the measured values. Results indicate that the energy absorbed by the snowpack through the whole spectrum considered can be inferred within 1.35%. This accuracy is only slightly better than that which can be obtained considering pure snow, meaning that the impact of impurities on the snow albedo is small at Summit. In the visible region, the discrepancies between measured and simulated albedo are mostly due to the lack of correction of the cosine collector deviation from a true cosine response. In the near-infrared, minor deviations up to 0.014 can be due the accuracy of SSA measurements and to the surface roughness, whereas deviations up to 0.05 can be explained by the vertical resolution of measurements of surface layer physical properties. At 1430 and around 1800 nm the discrepancies are larger and independent of the snow properties; they may be due to the uncertainties in the ice refractive index at these wavelengths. This work contributes to the development of physically-based albedo schemes in detailed snowpack models, and to the improvement of retrieval algorithms for estimating snow properties from remote sensing data.

Summary
Snow spectral albedo at Summit, Greenland: comparison between in situ measurements and numerical simulations using measured physical and chemical properties of the snowpack

Excerpt
Albert, M. and Hawley, R.: Seasonal differences in surface energy exchange and accumulation at Summit, Greenland, Ann. Glaciol., 31, 387–390, 2000.; Albert, M. R. and Shultz, E. F.: Snow and firn properties and air-snow transport processes at {S}ummit, {G}reenland, Atmos. Environ., 36, 2789–2797, 2002.; Alley, R., Saltzman, E., Cuffey, K., and Fitzpatrick, J.: Summertime formation of depth hoar in central Greenland, Geophys. Res. Lett., 17, 2393–2396, 1990.; Aoki, T., Hachikubo, A., and Hori, M.: Effects of snow physical parameters on shortwave broadband albedos, J. Geophys. Res., 108, 4616, doi:10.1029/2003JD003506, 2003.; Balkanski, Y., Schulz, M., Claquin, T., and Guibert, S.: Reevaluation of Mineral aerosol radiative forcings suggests a better agreement with satellite and AERONET data, Atmos. Chem. Phys., 7, 81–95, doi:10.5194/acp-7-81-2007, 2007.; Chýlek, P., Ramaswamy, V., and Cheng, R.: Albedo of soot-contaminated snow, J. Geophys. Res., 88, 10837–10843, 1983b.; Bergin, M., Jaffrezo, J.-L., Davidson, C., Dibb, J., Pandis, S., Hillamo, R., Maenhaut, W., Kuhns, H., and Makela, T.: The contributions of snow, fog, and dry deposition to the summer flux of anions and cations at Summit, Greenland, J. Geophys. Res., 100, 16275–16288, doi:10.1029/95JD01267, 1995.; Birch, M. and Cary, R.: Elemental carbon-based method for monitoring occupational exposures to particulate diesel exhaust, Aerosol Sci. Tech., 25, 221–241, 1996.; Chýlek, P., Ramaswamy, V., and Srivastava, V.: Dielectric constant of a composite inhomogeneous media, Phys. Rev. B, 27, 5098–5106, doi:10.1103/PhysRevB.27.5098, 1983a.; Colbeck, S. C.: Theory of metamorphism of dry snow, J. Geophys. Res., 88, 5475–5482, doi:10.1029/JC088iC09p05475, 1983.; Conger, S. M. and McClung, D. M.: Comparison of density cutters for snow profile observations, J. Glaciol, 55, 163–169, 2009.; Dibb, J. E. and Fahnestock, M.: Snow accumulation, surface height change, and firn densification at Summit, Greenland: insights from 2 years of in situ observations, J. Geophys. Res., 109, D24113, doi:10.1029/2003JD004300, 2004.; Dibb, J. E., Whitlow, S. I., and Arsenault, M.: Seasonal variations in the soluble ion content of snow at {S}ummit, {G}reenland: {c}onstraints from three years of daily surface snow samples, Atmos. Environ., 41, 5007–5019, doi:10.1016/j.atmosenv.2006.12.010, 2007.; Doherty, S. J., Warren, S. G., Grenfell, T. C., Clarke, A. D., and Brandt, R. E.: Light-absorbing impurities in Arctic snow, Atmos. Chem. Phys., 10, 11647–11680, doi:10.5194/acp-10-11647-2010, 2010.; Domine, F., Salvatori, R., Legagneux, L., Salzano, R., Fily, M., and Casacchia, R.: Correlation between the specific surface area and the short wave infrared ({S}{W}{I}{R}) reflectance of snow: preliminary investigation., Cold Reg. Sci. Technol., 46, 60–68, doi:

 

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