globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.01.016
Scopus记录号: 2-s2.0-85012951068
论文题名:
Deglacial variability in Okhotsk Sea Intermediate Water ventilation and biogeochemistry: Implications for North Pacific nutrient supply and productivity
作者: Lembke-Jene L.; Tiedemann R.; Nürnberg D.; Kokfelt U.; Kozdon R.; Max L.; Röhl U.; Gorbarenko S.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 160
起始页码: 116
结束页码: 137
语种: 英语
英文关键词: Bio-productivity ; Biological pump ; Glacial termination ; Intermediate water ; North Pacific ; Okhotsk sea ; Paleoceanography ; Siberian hinterland ; Stable isotopes ; Subarctic gyre
Scopus关键词: Biogeochemistry ; Biological materials ; Calcium carbonate ; Carbon ; Carbon dioxide ; Catchments ; Ecology ; Glacial geology ; Isotopes ; Oceanography ; Organic carbon ; Organic compounds ; Oxygenation ; Silicates ; Ventilation ; Water ; Biological pumps ; Glacial terminations ; Intermediate waters ; North Pacific ; Okhotsk sea ; Paleoceanography ; Siberian hinterland ; Stable isotopes ; Subarctic gyre ; Nutrients ; benthic foraminifera ; biogeochemistry ; biological production ; biological pump ; carbon sequestration ; catchment ; deep water ventilation ; deglaciation ; green alga ; gyre ; intermediate water ; Last Glacial ; nutrient dynamics ; paleoceanography ; planktonic foraminifera ; Preboreal ; primary production ; reconstruction ; remineralization ; stable isotope ; subarctic region ; Amur Basin ; Japan ; Pacific Coast [Japan] ; Pacific Ocean ; Pacific Ocean (North) ; Pacific Ocean (Northwest) ; Sea of Okhotsk ; Siberia ; algae ; Foraminifera
英文摘要: The modern North Pacific plays a critical role in marine biogeochemical cycles, as an oceanic sink of CO2 and by bearing some of the most productive and least oxygenated waters of the World Ocean. The capacity to sequester CO2 is limited by efficient nutrient supply to the mixed layer, particularly from deeper water masses in the Pacific's subarctic and marginal seas. The region is in addition only weakly ventilated by North Pacific Intermediate Water (NPIW), which receives its characteristics from Okhotsk Sea Intermediate Water (OSIW). Here, we present reconstructions of intermediate water ventilation and productivity variations in the Okhotsk Sea that cover the last glacial termination between eight and 18 ka, based on a set of high-resolution sediment cores from sites directly downstream of OSIW formation. In a multi-proxy approach, we use total organic carbon (TOC), chlorin, biogenic opal, and CaCO3 concentrations as indicators for biological productivity. C/N ratios and XRF scanning-derived elemental ratios (Si/K and Fe/K), as well as chlorophycean algae counts document changes in Amur freshwater and sediment discharge that condition the OSIW. Stable carbon isotopes of epi- and shallow endobenthic foraminifera, in combination with 14C analyses of benthic and planktic foraminifera imply decreases in OSIW oxygenation during deglacial warm phases from c. 14.7 to 13 ka (Bølling-Allerød) and c. 11.4 to 9 ka (Preboreal). No concomitant decreases in Okhotsk Sea benthic-planktic ventilation ages are observed, in contrast to nearby, but southerly locations on the Japan continental margin. We attribute Okhotsk Sea mid-depth oxygenation decreases in times of enhanced organic matter supply to maxima in remineralization within OSIW, in line with multi-proxy evidence for maxima in primary productivity and supply of organic matter. Sedimentary C/N and Fe/K ratios indicate more effective entrainment of nutrients into OSIW and thus an increased nutrient load of OSIW during deglacial warm periods. Correlation of palynological and sedimentological evidence from our sites with hinterland reference records suggests that millennial-scale changes in OSIW oxygen and nutrient concentrations were largely influenced by fluvial freshwater runoff maxima from the Amur, caused by a deglacial northeastward propagation of the East Asian Summer Monsoon that increased precipitation and temperatures, in conjunction with melting of permafrost in the Amur catchment area. We suggest that OSIW ventilation minima and the high lateral supply of nutrients and organic matter during the Allerød and Preboreal are mechanistically linked to concurrent maxima in nutrient utilization and biological productivity in the subpolar Northwest Pacific. In this scenario, increased export of nutrients from the Okhotsk Sea during deglacial warm phases supported subarctic Pacific shifts from generally Fe-limiting conditions to transient nutrient-replete regimes through enhanced advection of mid-depth nutrient- and Fe-rich OSIW into the upper ocean. This mechanism may have moderated the role of the subarctic Pacific in the deglacial CO2 rise on millennial timescales by combining the upwelling of old carbon-rich waters with a transient delivery of mid-depth-derived bio-available Fe and silicate. © 2017 The Authors
资助项目: We acknowledge the professional support and dedication of masters and crews of R/V Akademik Lavrentiev and R/V Sonne on expeditions LV28, LV29 and SO178. We thank J. Heinze and B. Fessler for help in sample analysis ; and N. Stange, M. Zygmuntowski and A. Dix for their support in sediment sampling and processing. The material for this study and initial works were carried out within frameworks of the German-Russian KOMEX projects (1998–2006). We acknowledge funds provided by the German Ministry for Research and Education (BMBF) under the grant No. 03F0704 (SIGEPAX) as well as financial support by the AWI and the Helmholtz REKLIM Initiative. UK acknowledges funding by the VILLUM Foundation (grant no. 10100).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59297
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作者单位: Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, Bremerhaven, Germany; GEOMAR Helmholtz-Zentrum für Ozeanforschung, Am Seefischmarkt 1-3, Kiel, Germany; GEUS, Geological Survey of Denmark and Greenland, Øster Voldgade 10, Købnhaven, Denmark; Lamont-Doherty Earth Observatory, Columbia University, PalisadesNY, United States; MARUM Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, Germany; V.I. Il'ichev Pacific Oceanological Institute FEB-RAS, Baltijskaja Str. 43, Vladivostok, Russian Federation

Recommended Citation:
Lembke-Jene L.,Tiedemann R.,Nürnberg D.,et al. Deglacial variability in Okhotsk Sea Intermediate Water ventilation and biogeochemistry: Implications for North Pacific nutrient supply and productivity[J]. Quaternary Science Reviews,2017-01-01,160
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