期刊
GLOBAL BIOGEOCHEMICAL CYCLES
卷 29, 期 11, 页码 1855-1873出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GB005204
关键词
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资金
- Chinese National Key Development Program for Basic Research [2014CB954003, 2015CB954201]
- Knut and Alice Wallenberg Foundation
- headquarters of the Russian Academy of Sciences
- Swedish Research Council
- US National Oceanic and Atmospheric Administration
- Russian Foundation of Basic Research [13-05-12028, 13-05-12041]
- Swedish Polar Research Secretariat
- Nordic Council
- Swedish Royal Academy of Sciences
- Government of the Russian Federation [2013-220-04-157]
- Tomsk [14.Z50.31.0012]
- Russian Scientific Foundation [15-17-20032]
- Swiss National Science foundation (SNF) [200021_140850]
- US National Science Foundation (NSF) [OCE-9907129, OCE-0137005, OCE-0526268]
- Stanley Watson Chair for Excellence in Oceanography
- ETH Zurich
- NWO Rubicon [825.10.022]
- Veni [863.12.004]
- UK NERC [NE/I024798/1]
- NSF [0436118, 0732555, 1107774]
- WHOI
- NERC [NE/I024798/1] Funding Source: UKRI
- Natural Environment Research Council [NE/I024798/1] Funding Source: researchfish
- Directorate For Geosciences
- Office of Polar Programs (OPP) [0436118] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1107774] Funding Source: National Science Foundation
Distinguishing the sources, ages, and fate of various terrestrial organic carbon (OC) pools mobilized from heterogeneous Arctic landscapes is key to assessing climatic impacts on the fluvial release of carbon from permafrost. Through molecular C-14 measurements, including novel analyses of suberin- and/or cutin-derived diacids (DAs) and hydroxy fatty acids (FAs), we compared the radiocarbon characteristics of a comprehensive suite of terrestrial markers (including plant wax lipids, cutin, suberin, lignin, and hydroxy phenols) in the sedimentary particles from nine major arctic and subarctic rivers in order to establish a benchmark assessment of the mobilization patterns of terrestrial OC pools across the pan-Arctic. Terrestrial lipids, including suberin-derived longer-chain DAs (C-24,C-26,C-28), plant wax FAs (C(24,26,2)8), and n-alkanes (C-27,C-29,C-31), incorporated significant inputs of aged carbon, presumably from deeper soil horizons. Mobilization and translocation of these old terrestrial carbon components was dependent on nonlinear processes associated with permafrost distributions. By contrast, shorter-chain (C-16,C-18) DAs and lignin phenols (as well as hydroxy phenols in rivers outside eastern Eurasian Arctic) were much more enriched in C-14, suggesting incorporation of relatively young carbon supplied by runoff processes from recent vegetation debris and surface layers. Furthermore, the radiocarbon content of terrestrial markers is heavily influenced by specific OC sources and degradation status. Overall, multitracer molecular C-14 analysis sheds new light on the mobilization of terrestrial OC from arctic watersheds. Our findings of distinct ages for various terrestrial carbon components may aid in elucidating fate of different terrestrial OC pools in the face of increasing arctic permafrost thaw.
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