First pan-Arctic assessment of dissolved organic carbon in lakes of the permafrost region

Abstract. Lakes in permafrost regions are dynamic landscape components and play an important role for climate change feedbacks. Lake processes such as mineralization flocculation of dissolved organic carbon (DOC), one the main fractions lakes, contribute to greenhouse effect part global cycle. These focus research, but studies so far limited specific study regions. In our synthesis, we analyzed 2167 water samples from 1833 lakes across Arctic Alaska, Canada, Greenland, Siberia provide first pan-Arctic insights linkages between DOC concentrations environment. Using published data unpublished datasets author team, report regional differences linked latitude, zones, ecoregions, geology, near-surface soil contents, ground ice classification each lake region. The dataset range 0 1130 mg L?1 (10.8 median concentration). Regarding found 12.4 (Siberia), 12.3 (Alaska), 10.3 (Greenland), 4.5 (Canada). Our synthesis shows a significant relationship concentration ecoregion. We higher at boreal sites compared tundra sites. significantly with ice-rich syngenetic deposits (yedoma) non-yedoma weak content well DOC. that depends on its environmental properties, especially extent ecoregion, vegetation, which is most driver this study. This new will be fundamental quantify pool estimations impact cycle change.