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Light attenuation characteristics of glacially-fed lakes

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dc.contributor.author Rose, Kevin C. en
dc.contributor.author Hamilton, David P. en
dc.contributor.author Williamson, Craig E. en
dc.contributor.author McBride, Chris G. en
dc.contributor.author Fischer, Janet M. en
dc.contributor.author Olson, Mark H. en
dc.contributor.author Saros, Jasmine E. en
dc.contributor.author Allan, Mathew G. en
dc.contributor.author Cabrol, Nathalie A. en
dc.date.accessioned 2015-04-20T15:15:25Z
dc.date.available 2015-04-20T15:15:25Z
dc.date.issued 2014
dc.identifier.citation Rose, Kevin C., Hamilton, David P., Williamson, Craig E., McBride, Chris G., Fischer, Janet M., Olson, Mark H., Saros, Jasmine E., Allan, Mathew G., and Cabrol, Nathalie A. 2014. "Light attenuation characteristics of glacially-fed lakes." <em>Journal of Geophysical Research. G. Biogeosciences</em>. 119 (7):1446&ndash;1457. <a href="https://doi.org/10.1002/2014JG002674">https://doi.org/10.1002/2014JG002674</a> en
dc.identifier.issn 2169-8953
dc.identifier.uri http://hdl.handle.net/10088/25255
dc.description.abstract Transparency is a fundamental characteristic of aquatic ecosystems and is highly responsive to changes in climate and land use. The transparency of glacially-fed lakes may be a particularly sensitive sentinel characteristic of these changes. However, little is known about the relative contributions of glacial flour versus other factors affecting light attenuation in these lakes. We sampled 18 glacially-fed lakes in Chile, New Zealand, and the U. S. and Canadian Rocky Mountains to characterize how dissolved absorption, algal biomass (approximated by chlorophyll a), water, and glacial flour contributed to attenuation of ultraviolet radiation (UVR) and photosynthetically active radiation (PAR, 400-700nm). Variation in attenuation across lakes was related to turbidity, which we used as a proxy for the concentration of glacial flour. Turbidity-specific diffuse attenuation coefficients increased with decreasing wavelength and distance from glaciers. Regional differences in turbidity-specific diffuse attenuation coefficients were observed in short UVR wavelengths (305 and 320nm) but not at longer UVR wavelengths (380nm) or PAR. Dissolved absorption coefficients, which are closely correlated with diffuse attenuation coefficients in most non-glacially-fed lakes, represented only about one quarter of diffuse attenuation coefficients in study lakes here, whereas glacial flour contributed about two thirds across UVR and PAR. Understanding the optical characteristics of substances that regulate light attenuation in glacially-fed lakes will help elucidate the signals that these systems provide of broader environmental changes and forecast the effects of climate change on these aquatic ecosystems. en
dc.relation.ispartof Journal of Geophysical Research. G. Biogeosciences en
dc.title Light attenuation characteristics of glacially-fed lakes en
dc.type Journal Article en
dc.identifier.srbnumber 127987
dc.identifier.doi 10.1002/2014JG002674
rft.jtitle Journal of Geophysical Research. G. Biogeosciences
rft.volume 119
rft.issue 7
rft.spage 1446
rft.epage 1457
dc.description.SIUnit SERC en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 1446
dc.citation.epage 1457

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