Climate-induced changes in the dissolved organic carbon budgets of boreal lakes |
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| Authors: | David W. Schindler P. Jefferson Curtis Suzanne E. Bayley Brian R. Parker Ken G. Beaty Michael P. Stainton |
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| Affiliation: | (1) Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada, T6G 2E9;(2) Present address: Division of Science, Okanagan University College, 3333 College Way, Kelowna, BC, Canada, V1V 1V7;(3) Freshwater Institute, Fisheries and Oceans Canada, Winnipeg, Manitoba, Canada, R3T 2N6 |
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| Abstract: | During 20 years of climatic warming, drought and increased forest firesbetween 1970 and 1990, DOC concentrations declined by 15--25%in lakesof the Experimental Lakes Area, northwestern Ontario, allowing increasedpenetration of both UV and photosynthetically-active radiation (PAR), andcausing deeper euphotic zones and thermoclines. Decreased input to thelakes of DOC from terrestrial catchments and upstream lakes was theprimary reason for the decline, although in-lake removal also increasedslightly. Decreased streamflow caused by drought was more important thanforest fires in affecting DOC exports from catchments. Experimentalacidification of lakes caused even greater losses in DOC, by enhancing ratesof in-lake removal. DOC in Lake 302S, acidified to pH 4.5 during the1980 s, declined to less than 10% of preacidificationvalues. |
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| Keywords: | dissolved organic carbon climatic change mass balance budgets lake acidification |
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