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, δ 13C signatures of surface sediments (δ 13Csed) are positively correlated to those of weighted δ 13CPOC in upper ocean (δ 13Csed =13.64+1.56×δ 13CPOC, 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 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 δ 13C record an indicator of paleo-CO2 in the western Arctic Ocean.
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References
Arrigo K R, Pabi S, Van Dijken G L, et al. 2010. Air-sea flux of CO2 in the Arctic Ocean, 1998–2003. Journal of Geophysical Research, 115(G4): G04024
Ashjian C J, Gallager S M, Plourde S. 2005. Transport of plankton and particles between the Chukchi and Beaufort Seas during summer 2002, described using a Video Plankton Recorder. Deep-Sea Research Part II: Topical Studies in Oceanography, 52(24–26): 3259–3280
Bates N R, Moran S B, Hansell D A, et al. 2006. An increasing CO2 sink in the Arctic Ocean due to sea-ice loss. Geophysical Research Letters, 33(23): L23609, doi: 10.1029/2006GL027028
Belicka L L, Macdonald R W, Harvey H R. 2002. Sources and transport of organic carbon to shelf, slope, and basin surface sediments of the Arctic Ocean. Deep-Sea Research Part I: Oceanographic Research Papers, 49(8): 1463–1483
Belicka L L, Macdonald R W, Yunker M B, et al. 2004. The role of depositional regime on carbon transport and preservation in Arctic Ocean sediments. Marine Chemistry, 86(1–2): 65–88
Bentaleb I, Fontugne M, Descolas-Gros C, et al. 1996. Organic carbon isotopic composition of phytoplankton and sea-surface pCO2 reconstructions in the Southern Indian Ocean during the last 50,000 yr. Organic Geochemistry, 24(4): 399–410
Bentaleb I, Fontugne M, Descolas-Gros C, et al. 1998. Carbon isotopic fractionation by plankton in the Southern Indian Ocean: relationship between δ 13C of particulate organic carbon and dissolved carbon dioxide. Journal of Marine Systems, 17(1–4): 39–58
Boetius A, Albrecht S, Bakker K, et al. 2013. Export of algal biomass from the melting Arctic sea ice. Science, 339(6126): 1430–1432
Brown K A, McLaughlin F, Tortell P D, et al. 2014. Determination of particulate organic carbon sources to the surface mixed layer of the Canada Basin, Arctic Ocean. Journal of Geophysical Research: Oceans, 119(2): 1084–1102
Buesseler K O, Bacon M P, Cochran J K, et al. 1992. Carbon and nitrogen export during the JGOFS North Atlantic Bloom experiment estimated from 234Th: 238U disequilibria. Deep-Sea Research Part A. Oceanographic Research Papers, 39(7–8): 1115–1137
Chen J H, Edwards R L, Wasserburg G L. 1986. 238U,234U and 232Th in seawater. Earth and Planetary Science Letters, 80(3–4): 241–251
Chen Liqi, Gao Zhongyong, Wang Weiqiang, et al. 2003a. Distribution pattern of pCO2 in the Bering Sea basin and its influence to the Arctic carbon sink. Science in China (D) (in Chinese), 33: 781–790
Chen Liqi, Gao Zhongyong. 2007. Spatial variability in the partial pressures of CO2 in the northern Bering and Chukchi seas. Deep-Sea Research Part II: Topical Studies in Oceanography, 54(23–26): 2619–2629
Chen Min, Huang Yipu, Cai Pinghe, et al. 2003b. Particulate organic carbon export fluxes in the Canada Basin and Bering Sea as derived from 234Th/238U disequilibria. Arctic, 56(1): 32–44
Chen Min, Huang Yipu, Qiu Yusheng. 1997. Enrichment, purification and determination of 238U and 234Th in natural seawater. Journal of Isotopes (in Chinese), 10: 199–199
Chen Zhihua, Shi Xuefa, Cai Deling, et al. 2006. Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments. Haiyang Xuebao (in Chinese), 25(5): 39–54
Emerson S, Quay P, Karl D, et al. 1997. Experimental determination of the organic carbon flux from open-ocean surface waters. Nature, 389(6654): 951–954
Fischer G, Müller P J, Wefer G. 1998. Latitudinal δ 13Corg variations in sinking matter and sediments from the South Atlantic: effects of anthropogenic CO2 and implications for paleo-PCO2 reconstructions. Journal of Marine Systems, 17(1–4): 471–495
Francois R, Altabet M A, Goericke R, et al. 1993. Changes in the δ 13C of surface water particulate organic matter across the subtropical convergence in the SW Indian Ocean. Global Biogeochemical Cycles, 7(3): 627–644
Guo Laodong, Tanaka T, Wang Deli, et al. 2004. Distributions, speciation and stable isotope composition of organic matter in the southeastern Bering Sea. Marine Chemistry, 91(1–4): 211–226
Hofmann M, Wolf-Gladrow D A, Takahashi T, et al. 2000. Stable carbon isotope distribution of particulate organic matter in the ocean: a model study. Marine Chemistry, 72(2–4): 131–150
Hollander D J, McKenzie J A. 1991. CO2 control on carbon-isotope fractionation during aqueous photosynthesis: A paleo-pCO2 barometer. Geology, 19(9): 929–932
Lapoussière A, Michel C, Starr M, et al. 2011. Role of free-living and particle-attached bacteria in the recycling and export of organic material in the Hudson Bay system. Journal of Marine Systems, 88(3): 434–445
Lee S H, Joo H M, Liu Zhilin, et al. 2012. Phytoplankton productivity in newly opened waters of the Western Arctic Ocean. Deep-Sea Research Part II: Topical Studies in Oceanography, 81–84: 18–27
Lehmann M F, Bernasconi S M, Barbieri A, et al. 2002. Preservation of organic matter and alteration of its carbon and nitrogen isotope composition during simulated and in situ early sedimentary diagenesis. Geochimica et Cosmochimica Acta, 66(20): 3573–3584
Liu Zilin, Chen Jianfang, Liu Yanlan, et al. 2011. The size-fractionated chlorophyll a concentration and primary productivity in the Bering Sea in the summer of 2008. Haiyang Xuebao (in Chinese), 33(3): 148–157
Liu Zilin, Chen Jianfang, Zhang Tao, et al. 2007. The size-fractionated chlorophyll a concentration and primary productivity in the Chukchi Sea and its northern Chukchi Plateau. Acta Ecologica Sinica (in Chinese), 27(12): 4953–4962
Ma Qiang, Chen Min, Qiu Yusheng, et al. 2005. Regional estimates of POC export flux derived from thorium-234 in the western Arctic Ocean. Acta Oceanologica Sinica, 24(6): 97–108
Moran S B, Kelly R P, Hagstrom K, et al. 2005. Seasonal changes in POC export flux in the Chukchi Sea and implications for water column-benthic coupling in Arctic shelves. Deep-Sea Research Part II: Topical Studies in Oceanography, 52(24–26): 3427–3451
Moran S B, Smith J N. 2000. 234Th as a tracer of scavenging and particle export in the Beaufort Sea. Continental Shelf Research, 20(2): 153–167
Naidu A S, Scalan R S, Feder H M, et al. 1993. Stable organic carbon isotopes in sediments of the north Bering-south Chukchi seas, Alaskan-Soviet Arctic Shelf. Continental Shelf Research, 13(5–6): 669–691
Owens S A, Buesseler K O, Sims K W W. 2011. Re-evaluating the 238Usalinity relationship in seawater: implications for the 238U-234Th disequilibrium method. Marine Chemistry, 127(1–4): 31–39
Perovich D K, Richter-Menge J A. 2009. Loss of sea ice in the Arctic. Annual Review of Marine Science, 1(1): 417–441
Popp B N, Trull T, Kenig F, et al. 1999. Controls on the carbon isotopic composition of Southern Ocean phytoplankton. Global Biogeochemical Cycles, 13(4): 827–843
Rau G H, Riebesell U, Wolf-Gladrow D. 1997. CO2 aq-dependent photosynthetic 13C fractionation in the ocean: a model versus observations. Global Biogeochemical Cycles, 11(2): 267–278
Rutgers van der Loeff M, Cai Pinghe H, Stimac I, et al. 2011. 234Th in surface waters: distribution of particle export flux across the Antarctic Circumpolar Current and in the Weddell Sea during the GEOTRACES expedition ZERO and DRAKE. Deep-Sea Research Part II: Topical Studies in Oceanography, 58(25–26): 2749–2766
Ruttenberg K C, Goñi M A. 1997. Phosphorus distribution, C:N:P ratios, and δ 13Coc in arctic, temperate, and tropical coastal sediments: tools for characterizing bulk sedimentary organic matter. Marine Geology, 139(1–4): 123–145
Smith S L, Henrichs S M, Rho T. 2002. Stable C and N isotopic composition of sinking particles and zooplankton over the southeastern Bering Sea shelf. Deep-Sea Research Part II: Topical Studies in Oceanography, 49(26): 6031–6050
Trimble S M, Baskaran M. 2005. The role of suspended particulate matter in 234Th scavenging and 234Th-derived export fluxes of POC in the Canada Basin of the Arctic Ocean. Marine Chemistry, 96(1–2): 1–19
Villinski J C, Dunbar R B, Mucciarone D A. 2000. Carbon 13/Carbon 12 ratios of sedimentary organic matter from the Ross Sea, Antarctica: a record of phytoplankton bloom dynamics. Journal of Geophysical Research, 105(C6): 14163–14172
Weiss R F. 1974. Carbon dioxide in water and seawater: the solubility of a non-ideal gas. Marine Chemistry, 2(3): 203–215
Yang Qingliang, Lin Gengming, Lin Mao, et al. 2006. Species composition and distribution of phytoplankton in Chukchi Sea and Bering Sea. Chinese Journal of Polar Research (in Chinese), 14(2): 113–125
Zhang Run, Chen Min, Guo Laodong, et al. 2012. Variations in the isotopic composition of particulate organic carbon and their relation with carbon dynamics in the western Arctic Ocean. Deep-Sea Research Part II: Topical Studies in Oceanography, 81–84: 72–78
Zhang Run, Zheng Minfang, Chen Min, et al. 2014. An isotopic perspective on the correlation of surface ocean carbon dynamics and sea ice melting in Prydz Bay (Antarctica) during austral summer. Deep-Sea Research Part I: Oceanographic Research Papers, 83: 24–33
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Foundation item: Chinese Polar Environment Comprehensive Investigation and Assessment Programs under contract Nos CHINARE 2014-03-04-03 and CHINARE 2014-04-03-05; the National Natural Science Foundation of China under contract Nos 41125020 and 41206062; a special scientific research project for public welfare under contract No. 201105022-4; the research project supported by the State Oceanic Administration under contract No. GASI-03-01-02-02; the Natural Science Foundation of Fujian Province of China under contract No. 2014J05049.
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Zhang, R., Chen, M., Ma, Q. et al. Insights into the coupling of upper ocean-benthic carbon dynamics in the western Arctic Ocean from an isotopic (13C, 234Th) perspective. Acta Oceanol. Sin. 34, 26–33 (2015). https://doi.org/10.1007/s13131-015-0684-x
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DOI: https://doi.org/10.1007/s13131-015-0684-x