They have analyzed 2167 water samples from 1833 lakes across the Arctic in permafrost regions of Alaska, Canada, Greenland, and Siberia. Our dataset ‘PeRL-DOCv1’ shows that the DOC concentration of a lake depends on its environmental properties, especially on permafrost extent and ecoregion, as well as vegetation, which is the most important driver of lake DOC in this study. The median lake DOC concentrations in our study regions are 12.4 mg L-1 in Siberia, 12.3 mg L-1 in Alaska, 10.3 mg L-1 in Greenland, and 4.5 mg L-1 in Canada.
They found higher lake DOC concentrations at boreal permafrost sites compared to tundra sites and significantly higher DOC concentrations in lakes in regions with yedoma deposits compared to non-yedoma lakes. The ‘PeRL-DOCv1’ dataset will be fundamental to quantify a pan-Arctic lake DOC pool for estimations of the impact of lake DOC on the global carbon cycle and climate change.
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