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

Stolpmann, L.; Coch, C.; Morgenstern, A.; Boike, J.; Fritz, M.; Herzschuh, U.; Stoof-Leichsenring, K.; Dvornikov, Y.; Heim, B.; Lenz, J.; Larsen, A.; Walter, A.K.; Jones, B.; Frey, K.; Grosse, G.

Авторы: Stolpmann Lydia, Coch Caroline, Morgenstern Anne, Boike Julia, Fritz Michael, Herzschuh Ulrike, Stoof-Leichsenring Kathleen, Dvornikov Yury, Heim Birgit, Lenz Josefine, Larsen Amy, Walter Anthony Katey, Jones Benjamin, Frey Karen, Grosse Guido
Журнал: Biogeosciences
Том: 18
Номер: 12
Год издания: 2021
Издательство: European Geosciences Union (EGU).
Местоположение издательства: Germany
Первая страница: 3917
Последняя страница: 3936
DOI: 10.5194/bg-18-3917-2021
Аннотация: Lakes in permafrost regions are dynamic landscape components and play an important role for climate change feedbacks. Lake processes such as mineralization and flocculation of dissolved organic carbon (DOC), one of the main carbon fractions in lakes, contribute to the greenhouse effect and are part of the global carbon cycle. These processes are in the focus of climate research, but studies so far are limited to specific study regions. In our synthesis, we analyzed 2167 water samples from 1833 lakes across the Arctic in permafrost regions of Alaska, Canada, Greenland, and Siberia to provide first pan-Arctic insights for linkages between DOC concentrations and the environment. Using published data and unpublished datasets from the author team, we report regional DOC differences linked to latitude, permafrost zones, ecoregions, geology, near-surface soil organic carbon contents, and ground ice classification of each lake region. The lake DOC concentrations in our dataset range from 0 to 1130mgL−1 (10.8 mgL−1 median DOC concentration). Regarding the permafrost regions of our synthesis, we found median lake DOC concentrations of 12.4 mgL−1 (Siberia), 12.3 mgL−1 (Alaska), 10.3 mgL−1 (Greenland), and 4.5 mgL−1 (Canada). Our synthesis shows a significant relationship between lake DOC concentration and lake ecoregion. We found higher lake DOC concentrations at boreal permafrost sites compared to tundra sites. We found significantly higher DOC concentrations in lakes in regions with ice-rich syngenetic permafrost deposits (yedoma) compared to non-yedoma lakes and a weak but significant relationship between soil organic carbon content and lake DOC concentration as well as between ground ice content and lake DOC. Our pan-Arctic dataset 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. This new 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.
Добавил в систему: Дворников Юрий Александрович

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First pan-Arctic assessment of dissolved organic carbon in lakes of the permafrost regionстатья Исследовательская статья

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