G. Hugelius, J. Ramage, E. Burke, A. Chatterjee, T. L. Smallman, T. Aalto, A. Bastos, C. Biasi, J. G. Canadell, N. Chandra, F. Chevallier, P. Ciais, J. Chang, L. Feng, M. W. Jones, T. Kleinen, M. Kuhn, R. Lauerwald, J. Liu, E. López-Blanco, I. T. Luijkx, M. E. Marushchak, S. M. Natali, Y. Niwa, D. Olefeldt, P. I. Palmer, P. K. Patra, W. Peters, S. Potter, B. Poulter, B. M. Rogers, W. J. Riley, M. Saunois, E. A. G. Schuur, R. L. Thompson, C. Treat, A. Tsuruta, M. R. Turetsky, A.-M. Virkkala, C. Voigt, J. Watts, Q. Zhu, B. Zheng
{"title":"Permafrost Region Greenhouse Gas Budgets Suggest a Weak CO2 Sink and CH4 and N2O Sources, But Magnitudes Differ Between Top-Down and Bottom-Up Methods","authors":"G. Hugelius, J. Ramage, E. Burke, A. Chatterjee, T. L. Smallman, T. Aalto, A. Bastos, C. Biasi, J. G. Canadell, N. Chandra, F. Chevallier, P. Ciais, J. Chang, L. Feng, M. W. Jones, T. Kleinen, M. Kuhn, R. Lauerwald, J. Liu, E. López-Blanco, I. T. Luijkx, M. E. Marushchak, S. M. Natali, Y. Niwa, D. Olefeldt, P. I. Palmer, P. K. Patra, W. Peters, S. Potter, B. Poulter, B. M. Rogers, W. J. Riley, M. Saunois, E. A. G. Schuur, R. L. Thompson, C. Treat, A. Tsuruta, M. R. Turetsky, A.-M. Virkkala, C. Voigt, J. Watts, Q. Zhu, B. Zheng","doi":"10.1029/2023GB007969","DOIUrl":null,"url":null,"abstract":"<p>Large stocks of soil carbon (C) and nitrogen (N) in northern permafrost soils are vulnerable to remobilization under climate change. However, there are large uncertainties in present-day greenhouse gas (GHG) budgets. We compare bottom-up (data-driven upscaling and process-based models) and top-down (atmospheric inversion models) budgets of carbon dioxide (CO<sub>2</sub>), methane (CH<sub>4</sub>) and nitrous oxide (N<sub>2</sub>O) as well as lateral fluxes of C and N across the region over 2000–2020. Bottom-up approaches estimate higher land-to-atmosphere fluxes for all GHGs. Both bottom-up and top-down approaches show a sink of CO<sub>2</sub> in natural ecosystems (bottom-up: −29 (−709, 455), top-down: −587 (−862, −312) Tg CO<sub>2</sub>-C yr<sup>−1</sup>) and sources of CH<sub>4</sub> (bottom-up: 38 (22, 53), top-down: 15 (11, 18) Tg CH<sub>4</sub>-C yr<sup>−1</sup>) and N<sub>2</sub>O (bottom-up: 0.7 (0.1, 1.3), top-down: 0.09 (−0.19, 0.37) Tg N<sub>2</sub>O-N yr<sup>−1</sup>). The combined global warming potential of all three gases (GWP-100) cannot be distinguished from neutral. Over shorter timescales (GWP-20), the region is a net GHG source because CH<sub>4</sub> dominates the total forcing. The net CO<sub>2</sub> sink in Boreal forests and wetlands is largely offset by fires and inland water CO<sub>2</sub> emissions as well as CH<sub>4</sub> emissions from wetlands and inland waters, with a smaller contribution from N<sub>2</sub>O emissions. Priorities for future research include the representation of inland waters in process-based models and the compilation of process-model ensembles for CH<sub>4</sub> and N<sub>2</sub>O. Discrepancies between bottom-up and top-down methods call for analyses of how prior flux ensembles impact inversion budgets, more and well-distributed in situ GHG measurements and improved resolution in upscaling techniques.</p>","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 10","pages":""},"PeriodicalIF":5.4000,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023GB007969","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Global Biogeochemical Cycles","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2023GB007969","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Large stocks of soil carbon (C) and nitrogen (N) in northern permafrost soils are vulnerable to remobilization under climate change. However, there are large uncertainties in present-day greenhouse gas (GHG) budgets. We compare bottom-up (data-driven upscaling and process-based models) and top-down (atmospheric inversion models) budgets of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) as well as lateral fluxes of C and N across the region over 2000–2020. Bottom-up approaches estimate higher land-to-atmosphere fluxes for all GHGs. Both bottom-up and top-down approaches show a sink of CO2 in natural ecosystems (bottom-up: −29 (−709, 455), top-down: −587 (−862, −312) Tg CO2-C yr−1) and sources of CH4 (bottom-up: 38 (22, 53), top-down: 15 (11, 18) Tg CH4-C yr−1) and N2O (bottom-up: 0.7 (0.1, 1.3), top-down: 0.09 (−0.19, 0.37) Tg N2O-N yr−1). The combined global warming potential of all three gases (GWP-100) cannot be distinguished from neutral. Over shorter timescales (GWP-20), the region is a net GHG source because CH4 dominates the total forcing. The net CO2 sink in Boreal forests and wetlands is largely offset by fires and inland water CO2 emissions as well as CH4 emissions from wetlands and inland waters, with a smaller contribution from N2O emissions. Priorities for future research include the representation of inland waters in process-based models and the compilation of process-model ensembles for CH4 and N2O. Discrepancies between bottom-up and top-down methods call for analyses of how prior flux ensembles impact inversion budgets, more and well-distributed in situ GHG measurements and improved resolution in upscaling techniques.
期刊介绍:
Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.