Spectral albedo and transmittance of thin young A rctic sea ice


Contact
Marcel.Nicolaus [ at ] awi.de

Abstract

Spectral albedo and transmittance in the range were measured on three separate dates on less than thick new Arctic sea ice growing on Kongsfjorden, Svalbard at,. Inherent optical properties, including absorption coefficients of particulate and dissolved material, were obtained from ice samples and fed into a radiative transfer model, which was used to analyze spectral albedo and transmittance and to study the influence of clouds and snow on these. Integrated albedo and transmittance for photosynthetically active radiation () were in the range 0.17-0.21 and 0.77-0.86, respectively. The average albedo and transmittance of the total solar radiation energy were 0.16 and 0.51, respectively. Values inferred from the model indicate that the ice contained possibly up to 40% brine and only 0.6% bubbles. Angular redistribution of solar radiation by clouds and snow was found to influence both the wavelength-integrated value and the spectral shape of albedo and transmittance. In particular, local peaks and depressions in the spectral albedo and spectral transmittance were found for wavelengths within atmospheric absorption bands. Simulated and measured transmittance spectra were within 5% for most of the wavelength range, but deviated up to 25% in the vicinity of, indicating the need for more optical laboratory measurements of pure ice, or improved modeling of brine optical properties in this near-infrared wavelength region.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Publication Status
Published
Eprint ID
43246
DOI https://www.doi.org/10.1002/2015jc011254

Cite as
Taskjelle, T. , Hudson, S. R. , Granskog, M. A. , Nicolaus, M. , Lei, R. , Gerland, S. , Stamnes, J. J. and Hamre, B. (2016): Spectral albedo and transmittance of thin young A rctic sea ice , Journal of Geophysical Research: Oceans, 121 (1), pp. 540-553 . doi: https://www.doi.org/10.1002/2015jc011254


Download
[thumbnail of Taskjelle-2015-JGR_2015JC011254.pdf]
Preview
PDF
Taskjelle-2015-JGR_2015JC011254.pdf

Download (1MB) | Preview
Cite this document as:

Share


Citation

Geographical region

Research Platforms
N/A

Campaigns
N/A


Actions
Edit Item Edit Item