Insights into the coupling of upper ocean-benthic carbon dynamics in the western Arctic Ocean from an isotopic (<sup>13</sup>C, <sub>234</sub>Th) perspective

ZHANG Run; CHEN Min; MA Qiang; CAO Jianping; QIU Yusheng

doi:10.1007/s13131-015-0684-x

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Article Navigation > Acta Oceanologica Sinica > 2015 > 34(6): 26-33

ZHANG Run, CHEN Min, MA Qiang, CAO Jianping, QIU Yusheng. Insights into the coupling of upper ocean-benthic carbon dynamics in the western Arctic Ocean from an isotopic (13C, 234Th) perspective[J]. Acta Oceanologica Sinica, 2015, 34(6): 26-33. doi: 10.1007/s13131-015-0684-x

Citation:

ZHANG Run, CHEN Min, MA Qiang, CAO Jianping, QIU Yusheng. Insights into the coupling of upper ocean-benthic carbon dynamics in the western Arctic Ocean from an isotopic (¹³C, ₂₃₄Th) perspective[J]. Acta Oceanologica Sinica, 2015, 34(6): 26-33. doi: 10.1007/s13131-015-0684-x

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Insights into the coupling of upper ocean-benthic carbon dynamics in the western Arctic Ocean from an isotopic (¹³C, ₂₃₄Th) perspective

doi: 10.1007/s13131-015-0684-x

1.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
2.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China

Received Date: 2014-05-12
Rev Recd Date: 2014-10-28

Abstract

Abstract

The coupling of upper ocean-benthic carbon dynamics in the ice-free western Arctic Ocean (the Chukchi Sea and the Canada Basin) was evaluated during the late July-early September 2003 using natural stable (¹³C) and radioactive (²³⁸U-₂₃₄Th) isotope tracers. POC export flux estimated from ₂₃₄Th/²³⁸U disequilibria and dissolved CO₂ concentration ([CO₂(aq)]) pointed out that the strengthened biological pump in the Chukchi Shelf have significantly lowered [CO₂(aq)] and altered the magnitude of isotopic (¹²C/¹³C) fractionation during carbon fixation in the surface ocean. Further, δ¹³C signatures of surface sediments (δ¹³C_sed) are positively correlated to those of weighted δ¹³CPOC in upper ocean (δ¹³C_sed =13.64+1.56×δ¹³CPOC, r²=0.73, p<0.01), suggesting that the POC isotopic signals from upper ocean have been recorded in the sediments, partly due to the rapid export of particles as evidenced by low residence times of the highly particle-reactive ₂₃₄Th from the upper water column. It is suggested that there probably exists an upper ocean-benthic coupling of carbon dynamics, which likely assures the sedimentary δ¹³C record an indicator of paleo-CO₂ in the western Arctic Ocean.
- δ¹³C,
- POC,
- sediment,
- carbon export flux,
- western Arctic Ocean

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References(28)

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