Particulate organic matter sinks and sources in high Arctic fjord

被引:74
作者
Kulinski, Karol [1 ]
Kedra, Monika [1 ]
Legezynska, Joanna [1 ]
Gluchowska, Marta [1 ]
Zaborska, Agata [1 ]
机构
[1] Polish Acad Sci, Inst Oceanol, IO PAN, PL-81712 Sopot, Poland
关键词
POC; POM; Carbon stable isotopes; Organic carbon accumulation rate; Organic carbon burial rate; Kongsfjorden; Spitsbergen; FOOD-WEB STRUCTURE; CARBON-ISOTOPE FRACTIONATION; MARGINAL ICE-ZONE; STABLE CARBON; GROWTH-RATE; TROPHIC RELATIONSHIPS; PLANKTON DELTA-C-13; ANTHROPOGENIC CO2; MARINE-SEDIMENTS; BURIAL RATES;
D O I
10.1016/j.jmarsys.2014.04.018
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The main aim of this paper is to present results on concentrations, fluxes and isotopic composition (delta C-13(org)) of particulate and sedimentary organic carbon (measures of particulate and sedimentary organic matter, respectively) in Kongsfjorden, Spitsbergen. The terrestrial particulate organic carbon (POC) input to the Kongsfjorden reached 760 . 10(6) +/- 145 . 10(6) g C-org y(-1), forced mostly by the glaciers' activity. This constituted 5-10% of the bulk POC supplied to the system. Marine primary production was the main source of the remaining 90-95% of POC. Organic carbon burial rates amounted to 9 +/- 1 g C-org m(-2) y(-1) in the central and 13 +/- 1 g C-org m(-2) y(-1) in the outer part of the fjord. Two terrestrial POM delta C-13(org) end members were identified: the ancient organic matter (OM) supplied by glaciers and rivers fed by water discharged from the glaciers (from -25.4 parts per thousand to -25.1 parts per thousand), and the fresh terrestrial POM (from -26.7 parts per thousand to -26.6 parts per thousand). Marine OM was characterized by a wide range of delta C-13(org) signatures: from <= -26.1 parts per thousand for the phytoplankton depleted in C-13(org) to ca. -15.8 parts per thousand for debris of marine phytobenthos. The lack of distinct marine delta C-13(org) end member and the resemblance of phytoplankton delta C-13(org) signatures to the terrestrial POM delta C-13(org) end member precluded the use of the two delta C-13(org) end member mixing model to trace the terrestrial OM in Kongsfjorden, which is also very likely to happen in other Arctic regions. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:27 / 37
页数:11
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