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Carbon storage and burial in thermokarst lakes of permafrost peatlands
Biogeochemistry ( IF 4 ) Pub Date : 2022-03-12 , DOI: 10.1007/s10533-022-00914-y
R. M. Manasypov , A. G. Lim , I. V. Krickov , L. S. Shirokova , V. P. Shevchenko , R. A. Aliev , J. Karlsson , O. S. Pokrovsky

Thermokarst (thaw) lakes of the Western Siberian Lowland (WSL), the World´s largest permafrost peatland, contain important but poorly constrained stocks of organic carbon (OC) and nitrogen. These lakes are highly vulnerable to climate warming and permafrost thaw. The present work aims to quantify the OC and total nitrogen (TN) stocks and accumulation rates in sediments of 11 thermokarst lakes in the WSL across a permafrost gradient, from isolated to discontinuous and continuous permafrost. We found an increase in OC and TN stocks in lake sediments (0–30 cm) from the northern taiga with sporadic permafrost (285 Tg C and 10.5 Tg N) to the tundra zone with continuous permafrost (628 Tg C and 26 Tg N). The upper 30 cm thermokarst lake sediments of the permafrost-affected WSL store 1250 ± 35 Tg C and 50 ± 1.4 Tg N). The OC accumulation rates in thermokarst lake sediments ranged from 36 to 250 g C m−2 year−1, which is 5 to 10 times higher than C accumulation rates in peatlands of western Siberia. The total OC accumulation in lakes of WSL is 7.8 ± 0.7 Tg C year−1. This is about 24–47% of the C emission from the WSL thermokarst lakes, implying that it represents an important factor in the C budget to consider in order to understand impacts of climate change and permafrost thaw on the C cycle.



中文翻译:

多年冻土泥炭地热喀斯特湖泊的碳储存和埋藏

西西伯利亚低地 (WSL) 的热岩溶(解冻)湖泊是世界上最大的永久冻土泥炭地,含有重要但受限的有机碳 (OC) 和氮储量。这些湖泊极易受到气候变暖和永久冻土融化的影响。目前的工作旨在量化 WSL 中 11 个热喀斯特湖泊沉积物中的 OC 和总氮 (TN) 储量和积累速率,这些湖泊跨越永久冻土梯度,从孤立到不连续和连续的永久冻土。我们发现从具有零星永久冻土(285 Tg C 和 10.5 Tg N)的北部针叶林(285 Tg C 和 10.5 Tg N)到具有连续永久冻土(628 Tg C 和 26 Tg N)的苔原带,湖泊沉积物中的 OC 和 TN 储量(0-30 cm)增加. 受永久冻土影响的 WSL 的上部 30 cm 热岩溶湖沉积物储存 1250 ± 35 Tg C 和 50 ± 1.4 Tg N)。-2 年-1,比西西伯利亚泥炭地的碳积累率高 5 到 10 倍。WSL 湖泊中 OC 的总积累量为 7.8 ± 0.7 Tg C 年-1。这约占 WSL 热喀斯特湖泊 C 排放的 24-47%,这意味着它代表了 C 预算中的一个重要因素,以便了解气候变化和永久冻土融化对 C 循环的影响。

更新日期:2022-03-12
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