Millennial-scale variability of marine productivity and terrigenous matter supply in the western Bering Sea over the past 180 kyr

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doi: 10.5194/cp-9-1345-2013
Author(s): Riethdorf, J. R.; Nürnberg, D.; Max, L.; Tiedemann, R.; Gorbarenko, S. A.; Malakhov, M. I.
Author Affiliation(s): Primary:
Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany
Other:
Alfred-Wegener-Institut für Polar- und Meeresforschung Forschungestelle, Germany
Russian Academy of Sciences, Pacific Oceanological Institute, Russian Federation
Russian Academy of Sciences, North Eastern Interdisciplinary Science Research Institute, Russian Federation
Volume Title: Climate of the Past
Source: Climate of the Past, 9(3), p.1345-1373. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. Published in Climate of the Past Discussion: 12 December 2012, http://www.clim-past-discuss.net/8/6135/2012/cpd-8-6135-2012.html; accessed in Nov., 2013. 183 refs.; illus., incl. 8 tables, sketch map
Summary: We used piston cores recovered in the western Bering Sea to reconstruct millennial-scale changes in marine productivity and terrigenous matter supply over the past ∼180 kyr. Based on a geochemical multi-proxy approach, our results indicate closely interacting processes controlling marine productivity and terrigenous matter supply comparable to the situation in the Okhotsk Sea. Overall, terrigenous inputs were high, whereas export production was low. Minor increases in marine productivity occurred during intervals of Marine Isotope Stage 5 and interstadials, but pronounced maxima were recorded during interglacials and Termination I. The terrigenous material is suggested to be derived from continental sources on the eastern Bering Sea shelf and to be subsequently transported via sea ice, which is likely to drive changes in surface productivity, terrigenous inputs, and upper-ocean stratification. From our results we propose glacial, deglacial, and interglacial scenarios for environmental change in the Bering Sea. These changes seem to be primarily controlled by insolation and sea-level forcing which affect the strength of atmospheric pressure systems and sea-ice growth. The opening history of the Bering Strait is considered to have had an additional impact. High-resolution core logging data (color b*, XRF scans) strongly correspond to the Dansgaard-Oeschger climate variability registered in the NGRIP ice core and support an atmospheric coupling mechanism of Northern Hemisphere climates.
Year of Publication: 2013
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Atmospheric pressure; Atmospheric transport; Bering Sea; Bering Strait; C-14; Calcium carbonate; Carbon; Carbon dioxide; Cenozoic; Chemical composition; Chlorophyll; Dansgaard-Oeschger cycles; Detroit Seamount; Diatoms; Emperor Seamounts; Foraminifera; Glacial environment; Holocene; Ice; Interglacial environment; Interstadial environment; Invertebrata; Isotopes; Last glacial maximum; Leg 145; MIS 5; MIS 6; Meiji Seamount; Microfossils; NGRIP; Nitrates; North Pacific; Northwest Pacific; Nutrients; ODP Site 882; Ocean Drilling Program; Okhotsk Sea; Organic compounds; Pacific Ocean; Paleocurrents; Paleoenvironment; Pigments; Plantae; Pleistocene; Porphyrins; Productivity; Protista; Quaternary; Radioactive isotopes; Radiolaria; Sea ice; Sea-surface temperature; Seasonal variations; Terrigenous materials; Total organic carbon; Transport; West Pacific; Western Bering Sea; Winds
Coordinates: N502148 N502148 E1673600 E1673600
Record ID: 2014059202
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany