Last Glacial–Holocene change in intermediate-water ventilation in the Northwestern Pacific

Ohkushi, Ken’ichi; Itaki, Takuya; Nemoto, Naoki

doi:10.1016/s0277-3791(03)00082-9

Cited by 107 publications

(73 citation statements)

References 22 publications

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“…Hence, it was suggested that NPIW formation was more enhanced, that it reached deeper, and that its source might have shifted to the Bering Sea during HS1 and during other cold periods (e.g. Matsumoto et al, 2002;Ohkushi et al, 2003;Rella et al, 2012;Jaccard and Galbraith, 2013).…”

Section: Deglacial Situationmentioning

confidence: 99%

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

et al. 2013

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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

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Section: Deglacial Situationmentioning

confidence: 99%

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

et al. 2013

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“…The glacial distribution of the NPIW radiolarian indicator, Cycladophora davisiana, dominates in the North Pacific and the Bering Sea, but is barren in the Okhotsk Sea (Okazaki et al 2003), which suggests that the intermediate water is derived from the Bering Sea rather than the Okhotsk Sea (Ohkushi et al 2003). During LGM, the sea ice cover is heavy and there is no formation of winter sea ice in the shelf region where the intermediate water is currently produced.…”

Section: The Nipw Supply From the Okhotsk Seamentioning

confidence: 99%

Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years

Wang¹,

Wang²

2008

Terr. Atmos. Ocean. Sci.

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This study provides insight into changes in sea ice conditions and the oceanographic environment over the past 500 kyr through analysis of the diatom record. Based on the relative abundance of 13 diatoms species in piston core MD012414, four types of environmental conditions in the central Okhotsk Sea over the last 330 ka BP have been distinguished: (1) open-ocean alternating with seasonal sea-ice cover in Stages 9, 5, and 1; (2) almost open-ocean free of sea-ice cover in Stages 7 and 3; (3) perennial sea-ice cover in Stages 6, 4, and 2; and (4) a warm ice-age dominated by open ocean assemblages in Stage 8. The littoral diatom species, Paralia sulcata, showed a sudden increase from the glacial period to the interglacial period over the last 330 ka BP, except during Stage 8. Such a result implies that melting sea-ice transported terrigenous materials from the north Okhotsk Sea continental shelves to the central ocean during deglaciation. From Stage 13 to Stage 10, however, cold and warm marine conditions unexpectedly occurred in the late interglacial periods and the glacial periods, respectively. One possible reason for this is a lack of age control points from Stage 13 to Stage 10, and the different sediment accumulation rates between glacial and interglacial periods. This study suggests not only the process by which oceanographic variation of sea ice occurred, but also new significance for Paralia sulcata as an indicator in the diatom record of the Okhotsk Sea.

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“…18 O values documented in planktonic foraminifera shells show no significant changes in the North Pacific Ocean throughout the Holocene (Ohkushi et al 2003;Sun et al 2005;Kubota et al 2010). The weakened WPSH, which reduces the transport of water vapour from the high-latitude North Pacific, has probably been an important reason for the enrichment of 18 O in Qinghai Lake during the Holocene.…”

mentioning

confidence: 93%

Lagged response of summer precipitation to insolation forcing on the northeastern Tibetan Plateau during the Holocene

et al. 2017

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Last Glacial–Holocene change in intermediate-water ventilation in the Northwestern Pacific

Cited by 107 publications

References 22 publications

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

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

Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years

Lagged response of summer precipitation to insolation forcing on the northeastern Tibetan Plateau during the Holocene

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