Zabelina S. A. auteur aut IRD Shirokova L. S. auteur aut IRD Klimov S. I. auteur aut IRD Chupakov A. V. auteur aut IRD Lim A. G. auteur aut IRD Polishchuk Y. M. auteur aut IRD Polishchuk V. Y. auteur aut IRD Bogdanov A. N. auteur aut IRD Muratov I. N. auteur aut IRD Guérin Frédéric auteur aut IRD Karlsson J. auteur aut IRD Pokrovsky O. S. auteur aut IRD text journalArticle eng text/pdf reformatted digital access Emission of greenhouse gases (GHGs) from inland waters is recognized as highly important and an understudied part of the terrestrial carbon (C) biogeochemical cycle. These emissions are still poorly quantified in subarctic regions that contain vast amounts of surface C in permafrost peatlands. This is especially true in NE European peatlands, located within sporadic to discontinuous permafrost zones which are highly vulnerable to thaw. Initial measurements of C emissions from lentic waters of the Bolshezemelskaya Tundra (BZT; 200,000 km(2)) demonstrated sizable CO(2)and CH(4)concentrations and fluxes to the atmosphere in 98 depressions, thaw ponds, and thermokarst lakes ranging from 0.5 x 10(6)to 5 x 10(6) m(2)in size. CO(2)fluxes decreased by an order of magnitude as waterbody size increased by > 3 orders of magnitude while CH(4)fluxes showed large variability unrelated to lake size. By using a combination of Landsat-8 and GeoEye-1 images, we determined lakes cover 4% of BZT and thus calculated overall C emissions from lentic waters to be 3.8 +/- 0.65 Tg C yr(-1)(99% C-CO2, 1% C-CH4), which is two times higher than the lateral riverine export. Large lakes dominated GHG emissions whereas small thaw ponds had a minor contribution to overall water surface area and GHG emissions. These data suggest that, if permafrost thaw in NE Europe results in disappearance of large thermokarst lakes and formation of new small thaw ponds and depressions, GHG emissions from lentic waters in this region may decrease. specialized RUSSIE 036 082 126 66 suppl. 1 S216-S230 2021 0024-3590 https://www.documentation.ird.fr/hor/fdi:010079357 10.1002/lno.11560 0024-3590 [F B010079357] https://www.documentation.ird.fr/hor/fdi:010079357 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-08/010079357.pdf IRD - Base Horizon / Pleins textes 2020-09-17 2025-02-24 fdi:010079357 fre