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

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

Content Provider	Springer Nature Link
Author	Zhang, Run Chen, Min Ma, Qiang Cao, Jianping Qiu, Yusheng
Copyright Year	2015
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 ($^{13}$C) and radioactive ($^{238}$U-$^{234}$Th) isotope tracers. POC export flux estimated from $^{234}$Th/$^{238}$U disequilibria and dissolved CO$_{2}$ concentration ([CO$_{2}$(aq)]) pointed out that the strengthened biological pump in the Chukchi Shelf have significantly lowered [CO$_{2}$(aq)] and altered the magnitude of isotopic ($^{12}$C/$^{13}$C) fractionation during carbon fixation in the surface ocean. Further, δ $^{13}$C signatures of surface sediments (δ $^{13}$C$_{sed}$) are positively correlated to those of weighted δ $^{13}$C$_{POC}$ in upper ocean (δ $^{13}$C$_{sed}$ =13.64+1.56×δ $^{13}$C$_{POC}$, r $^{2}$=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 $^{234}$Th 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 δ $^{13}$C record an indicator of paleo-CO$_{2}$ in the western Arctic Ocean.
Starting Page	26
Ending Page	33
Page Count	8
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	34
Issue Number	6
e-ISSN	18691099
Language	English
Publisher	The Chinese Society of Oceanography
Publisher Date	2015-06-09
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	δ $^{13}$C POC sediment carbon export flux western Arctic Ocean Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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