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181 0 _ai
182 0 _ab
200 1 _aDifferent sources and degradation state of dissolved, particulate, and sedimentary organic matter along the Eurasian Arctic coastal margin
_fE. S. Karlsson [et al.]
203 _aText
_celectronic
300 _aTitle screen
330 _aThawing Arctic permafrost causes massive fluvial and erosional releases of dissolved and particulate organic carbon (DOC and POC) to coastal waters. Here we investigate how different sources and degradation of remobilized terrestrial carbon may affect large-scale carbon cycling, by comparing molecular and dual-isotope composition of waterborne high molecular weight DOC (>1?kD, aka colloidal OC), POC, and sedimentary OC (SOC) across the East Siberian Arctic Shelves. Lignin phenol fingerprints demonstrate a longitudinal trend in relative contribution of terrestrial sources to coastal OC. Wax lipids and cutins were not detected in colloidal organic carbon (COC), in contrast to POC and SOC, suggesting that different terrestrial carbon pools partition into different aquatic carrier phases. The ?14C signal suggests overwhelmingly contemporary sources for COC, while POC and SOC are dominated by old C from Ice Complex Deposit (ICD) permafrost. Monte Carlo source apportionment (?13C, ?14C) constrained that COC was dominated by terrestrial OC from topsoil permafrost (65%) and marine plankton (25%) with smaller contribution ICD and other older permafrost stocks (9%). This distribution is likely a result of inherent compositional matrix differences, possibly driven by organomineral associations. Modern OC found suspended in the surface water may be more exposed to degradation, in contrast to older OC that preferentially settles to the seafloor where it may be degraded on a longer timescale. The different sources which partition into DOC, POC, and SOC appear to have vastly different fates along the Eurasian Arctic coastal margin and may possibly respond on different timescales to climate change.
333 _aРежим доступа: по договору с организацией-держателем ресурса
461 _tGlobal Biogeochemical Cycles
_d1987-
463 _tVol. 30, iss. 6
_v[P. 898-919]
_d2016
610 1 _aэлектронный ресурс
610 1 _aтруды учёных ТПУ
610 1 _aорганические вещества
610 1 _aбиомаркеры
610 1 _aизотопы
701 1 _aKarlsson
_bE. S.
701 1 _aGelting
_bJ.
_gJohan
701 1 _aTesi
_bT.
_gTommaso
701 1 _avan Dongen
_bB. E.
701 1 _aAndersson
_bA.
_gAugust
701 1 _aSemiletov
_bI. P.
_cgeographer
_cProfessor of Tomsk Polytechnic University, doctor of geographical Sciences
_f1955-
_gIgor Petrovich
_2stltpush
_3(RuTPU)RU\TPU\pers\34220
701 1 _aCharkin
_bA. N.
_cgeologist
_cengineer-researcher of Tomsk Polytechnic University, candidate of geological and mineralogical Sciences
_f1980-
_gAleksandr Nikolaevich
_2stltpush
_3(RuTPU)RU\TPU\pers\35441
701 1 _aDudarev
_bO. V.
_cgeologist
_cresearcher of Tomsk Polytechnic University, candidate of geological and mineralogical Sciences
_f1955-
_gOleg Viktorovich
_2stltpush
_3(RuTPU)RU\TPU\pers\35379
701 1 _aGustafsson
_bO.
_gOrjan
712 0 2 _aНациональный исследовательский Томский политехнический университет (ТПУ)
_bИнститут природных ресурсов (ИПР)
_bКафедра геологии и разведки полезных ископаемых (ГРПИ)
_h2181
_2stltpush
_3(RuTPU)RU\TPU\col\18660
712 0 2 _aНациональный исследовательский Томский политехнический университет (ТПУ)
_bИнститут природных ресурсов (ИПР)
_bКафедра геологии и разведки полезных ископаемых (ГРПИ)
_bМеждународная научно-образовательная лаборатория изучения углерода арктических морей (МНОЛ ИУАМ)
_h7398
_2stltpush
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801 2 _aRU
_b63413507
_c20171115
_gRCR
856 4 _uhttp://dx.doi.org/10.1002/2015GB005307
942 _cCF