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Title: Modeling CO 2 emissions from Arctic lakes: Model development and site-level study

Recent studies indicated that Arctic lakes play an important role in receiving, processing, and storing organic carbon exported from terrestrial ecosystems. To quantify the contribution of Arctic lakes to the global carbon cycle, we developed a one-dimensional process-based Arctic Lake Biogeochemistry Model (ALBM) that explicitly simulates the dynamics of organic and inorganic carbon in Arctic lakes. By realistically modeling water mixing, carbon biogeochemistry, and permafrost carbon loading, the model can reproduce the seasonal variability of CO 2 fluxes from the study Arctic lakes. The simulated area-weighted CO 2 fluxes from yedoma thermokarst lakes, nonyedoma thermokarst lakes, and glacial lakes are 29.5, 13.0, and 21.4 g C m -2 yr -1, respectively, close to the observed values (31.2, 17.2, and 16.5 Β± 7.7 g C m -2 yr -1, respectively). The simulations show that the high CO 2 fluxes from yedoma thermokarst lakes are stimulated by the biomineralization of mobilized labile organic carbon from thawing yedoma permafrost. The simulations also imply that the relative contribution of glacial lakes to the global carbon cycle could be the largest because of their much larger surface area and high biomineralization and carbon loading. According to the model, sunlight-induced organic carbon degradation is more importantmore » for shallow nonyedoma thermokarst lakes but its overall contribution to the global carbon cycle could be limited. Overall, the ALBM can simulate the whole-lake carbon balance of Arctic lakes, a difficult task for field and laboratory experiments and other biogeochemistry models.« less
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ;  [3] ; ORCiD logo [3] ; ORCiD logo [4] ;  [5]
  1. Purdue Univ., West Lafayette, IN (United States). Department of Earth, Atmospheric, and Planetary Sciences; Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Purdue Univ., West Lafayette, IN (United States). Department of Earth, Atmospheric, and Planetary Sciences and Department of Agronomy
  3. University of Eastern Finland, Kuopio (Finland). Department of Environmental and Biological Science
  4. ETH Zurich, Zurich (Switzerland). Department of Environmental Systems Science
  5. University of Alaska Fairbanks, Fairbanks, AK (United States). Water and Environmental Research Center
Publication Date:
Report Number(s):
Journal ID: ISSN 1942-2466; TRN: US1800444
Grant/Contract Number:
AC05-076RL01830; FG02-08ER64599; AC02-05CH11231
Published Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Volume: 9; Journal Issue: 5; Journal ID: ISSN 1942-2466
American Geophysical Union (AGU)
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1390344; OSTI ID: 1413514