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Field investigations of apparent optical properties of ice cover in Finnish and Estonian lakes in winter 2009
Polar Research Institute of China, 451 Jinqiao Road, Pudong, Shanghai, 200136 China.
Department of Physics, University of Helsinki, Box 48, FI-00014 Helsinki, Finland.
Marine Systems Institute, Tallinn University of Technology, Akadeemia tee 21, 12618 Tallinn, Estonia.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. Department of Physics, University of Helsinki, Box 48, FI-00014 Helsinki, Finland.ORCID iD: 0000-0002-0861-3341
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2011 (English)In: Estonian journal of earth sciences, ISSN 1736-4728, E-ISSN 1736-7557, ISSN 1736-4728, Vol. 60, no 1, p. 50-64Article in journal (Refereed) Published
Abstract [en]

A field programme on light conditions in ice-covered lakes and optical properties of lake ice was performed in seven lakes of Finland and Estonia in February-April 2009. On the basis of irradiance measurements above and below ice, spectral reflectance and transmittance were determined for the ice sheet; time evolution of photosynthetically active radiation (PAR) transmittance was examined from irradiance recordings at several levels inside the ice sheet. Snow cover was the dominant factor for transmission of PAR into the lake water body. Reflectance was 0.74-0.92 in winter, going down to 0.18-0.22 in the melting season. The bulk attenuation coefficient of dry snow was 14-25 m-1; the level decreased as the spring was coming. The reflectance and bulk attenuation coefficient of snow-free ice were 0.1-0.4 and 1-5 m-1. Both were considerably smaller than those of snow cover. Seasonal evolution of light transmission was mainly due to snow melting. Snow and ice cover not only depress the PAR level in a lake but also influence the spectral and directional distribution of light.

Place, publisher, year, edition, pages
2011. Vol. 60, no 1, p. 50-64
Keywords [en]
lake ice, snow, optics, reflectance, transmittance, attenuation coefficient
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-157427DOI: 10.3176/earth.2011.1.05OAI: oai:DiVA.org:su-157427DiVA, id: diva2:1220274
Available from: 2018-06-18 Created: 2018-06-18 Last updated: 2018-06-18

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