World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Snow Spectral Albedo at Summit, Greenland: Measurements and Numerical Simulations Based on Physical and Chemical Properties of the Snowpack : Volume 7, Issue 4 (24/07/2013)

By Carmagnola, C. M.

Click here to view

Book Id: WPLBN0003981167
Format Type: PDF Article :
File Size: Pages 22
Reproduction Date: 2015

Title: Snow Spectral Albedo at Summit, Greenland: Measurements and Numerical Simulations Based on Physical and Chemical Properties of the Snowpack : Volume 7, Issue 4 (24/07/2013)  
Author: Carmagnola, C. M.
Volume: Vol. 7, Issue 4
Language: English
Subject: Science, Cryosphere
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Carmagnola, C. M., Strellis, B., Libois, Q., Dibb, J., Wright, P., Arnaud, L.,...Dumont, M. (2013). Snow Spectral Albedo at Summit, Greenland: Measurements and Numerical Simulations Based on Physical and Chemical Properties of the Snowpack : Volume 7, Issue 4 (24/07/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Météo-France – CNRS, CNRM – GAME UMR 3589, Centre d'Etudes de la Neige, Grenoble, France. The broadband 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 spectral albedo by comparing the measured albedo to the albedo calculated with a radiative transfer model, using measured snow physical and chemical properties. 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 dust, 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 1.10%. 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 near infrared, minor deviations in albedo up to 0.014 can be due to the accuracy of radiation and SSA measurements and to the surface roughness, whereas deviations up to 0.05 can be explained by the spatial heterogeneity of the snowpack at small scales, the assumption of spherical snow grains made for DISORT simulations and 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; we propose that they are due to errors 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: measurements and numerical simulations based on 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 Summit, Greenland, 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 Boucher, O.: 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.; 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(D8), 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.; Bourgeois, C. S., Calanca, P., and Ohmura, A.: A field study of the hemispherical directional reflectance factor and spectral albedo of dry snow, J. Geophys. Res., 111, D20108, doi:10.1029/2006JD007296, 2006.; 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.; Chýlek, P., Ramaswamy, V., and Cheng, R.: Albedo of soot-contaminated snow, J. Geophys. Res., 88, 10837–10843, 1983b.; Colbeck, S. C.: Theory of metamorphism of dry snow, J. Geophys. Res., 88, 5475–5482, doi:10.1029/0JGREA0000880000C9005475000001, 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 Summit, Greenland : Constraints 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 (SWIR) reflectance of snow: preliminary investigation, Cold Reg. Sci. Technol., 46, 60–68, doi:10.1016/j.coldregions.2006.06.002, 2006.; Domine, F., Taillandier, A.-S., Houdier, S., Parrenin, F., Simpson, W. R., and Douglas, T. A.: Interactions between snow metamorphism and climate physical and chemical aspects, in: P. C. I., edited by: Kuhs, W. F., 27–46, Roy. Soc. Chem., Cambrid

 

Click To View

Additional Books


  • How Does Ocean Ventilation Change Under ... (by )
  • Comparison of Glaciological and Volumetr... (by )
  • Sea Level Budget Over 2005–2013: Missing... (by )
  • Technical Note: Remote Sensing of Sea Su... (by )
  • Mémoires De L'Académie Royale Des Scienc... Volume: t.1:pt.2 (1777-1778) (by )
  • International Catalogue of Scientific Li... Volume Div. K, 1907 (by )
  • Snow Spectral Albedo at Summit, Greenlan... (by )
  • Comptes Rendus Hebdomadaires des Seances... Volume Tome 99 (by )
  • Science : Volume 4 (by )
  • High Resolution Modelling of the North I... (by )
  • Comptes Rendus Hebdomadaires des Seances... Volume Tome 130 (by )
  • Bulletin - New York State Museum Volume: no. 10 1890 (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.