Bounding cross-shelf transport time and degradation in Siberian-Arctic land-ocean carbon transfer

被引：106
作者：
Broder, Lisa [1 ,2 ,7 ]
Tesi, Tommaso [1 ,2 ,3 ]
Andersson, August [1 ,2 ]
Semiletov, Igor [4 ,5 ,6 ]
Gustafsson, Orjan [1 ,2 ]
机构：
[1] Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden
[2] Stockholm Univ, Bolin Ctr Climate Res, S-10691 Stockholm, Sweden
[3] CNR, Inst Marine Sci, I-40129 Bologna, Italy
[4] Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK 99775 USA
[5] Russian Acad Sci, Pacific Oceanol Inst, Vladivostok 690041, Russia
[6] Natl Res Tomsk Polytech Univ, Tomsk 634034, Russia
[7] Vrije Univ Amsterdam, Dept Earth Sci, NL-1081 HV Amsterdam, Netherlands
来源：
NATURE COMMUNICATIONS | 2018年 / 9卷
基金：
俄罗斯科学基金会; 欧洲研究理事会; 瑞典研究理事会; 美国国家科学基金会; 美国海洋和大气管理局;
关键词：
TERRIGENOUS ORGANIC-MATTER; LAPTEV SEA; TERRESTRIAL BIOSPHERE; RIVERINE PARTICLES; SUBSEA PERMAFROST; OLD CARBON; EROSION; C-14; SEDIMENTS; COASTAL;
D O I：
10.1038/s41467-018-03192-1
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：
The burial of terrestrial organic carbon (terrOC) in marine sediments contributes to the regulation of atmospheric CO2 on geological timescales and may mitigate positive feedback to present-day climate warming. However, the fate of terrOC in marine settings is debated, with uncertainties regarding its degradation during transport. Here, we employ compound-specific radiocarbon analyses of terrestrial biomarkers to determine cross-shelf transport times. For the World's largest marginal sea, the East Siberian Arctic shelf, transport requires 3600 +/- 300 years for the 600 km from the Lena River to the Laptev Sea shelf edge. TerrOC was reduced by similar to 85% during transit resulting in a degradation rate constant of 2.4 +/- 0.6 kyr(-1). Hence, terrOC degradation during cross-shelf transport constitutes a carbon source to the atmosphere over millennial time. For the contemporary carbon cycle on the other hand, slow terrOC degradation brings considerable attenuation of the decadal-centennial permafrost carbon-climate feedback caused by global warming.
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页数：8
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