Utilization of ancient permafrost carbon in headwaters of Arctic fluvial networks

被引:231
|
作者
Mann, Paul J. [1 ]
Eglinton, Timothy I. [2 ]
McIntyre, Cameron P. [2 ,3 ]
Zimov, Nikita [4 ]
Davydova, Anna [4 ]
Vonk, Jorien E. [5 ,6 ]
Holmes, Robert M. [7 ]
Spencer, Robert G. M. [8 ]
机构
[1] Northumbria Univ, Dept Geog, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England
[2] Swiss Fed Inst Technol, Inst Geol, Dept Earth Sci, CH-8092 Zurich, Switzerland
[3] Swiss Fed Inst Technol, Lab Ion Beam Phys, Dept Phys, CH-8093 Zurich, Switzerland
[4] Russian Acad Sci, Far Eastern Branch, Pacific Inst Geog, North East Sci Stn, Republic Of Sakha, Yakutia, Russia
[5] Univ Utrecht, Dept Earth Sci, NL-3584 CS Utrecht, Netherlands
[6] Univ Groningen, Arctic Ctr, NL-9700 AS Groningen, Netherlands
[7] Woods Hole Res Ctr, Falmouth, MA 02540 USA
[8] Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA
基金
美国国家科学基金会;
关键词
DISSOLVED ORGANIC-CARBON; PRIOR INFORMATION; RIVER; UNCERTAINTY; BIOLABILITY; RELEASE; OCEAN; THAW;
D O I
10.1038/ncomms8856
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Northern high-latitude rivers are major conduits of carbon from land to coastal seas and the Arctic Ocean. Arctic warming is promoting terrestrial permafrost thaw and shifting hydrologic flowpaths, leading to fluvial mobilization of ancient carbon stores. Here we describe C-14 and C-13 characteristics of dissolved organic carbon from fluvial networks across the Kolyma River Basin (Siberia), and isotopic changes during bioincubation experiments. Microbial communities utilized ancient carbon (11,300 to >50,000 C-14 years) in permafrost thaw waters and millennial-aged carbon (up to 10,000 C-14 years) across headwater streams. Microbial demand was supported by progressively younger (C-14-enriched) carbon downstream through the network, with predominantly modern carbon pools subsidizing microorganisms in large rivers and main-stem waters. Permafrost acts as a significant and preferentially degradable source of bioavailable carbon in Arctic freshwaters, which is likely to increase as permafrost thaw intensifies causing positive climate feedbacks in response to on-going climate change.
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页数:7
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