Abstract
An oxygen minimum zone (OMZ) currently exists at intermediate water depths on the northern Japanese margin in the northwestern Pacific. The OMZ results largely from a combination of high surface–water productivity and poor ventilation of intermediate waters. We investigated the late Quaternary history (last 27 kyr) of the intensity of this OMZ using changes in benthic foraminiferal carbon isotopes and assemblages in a sediment core taken on the continental slope off Shimokita Peninsula, northern Japan, at a water depth of 975 m. The core was located well within the region of the present-day OMZ and high surface–water productivity. The benthic foraminiferal δ13C values, which indicate millennial-scale fluctuations of nutrient contents at the sediment–water interface, were 0.48‰ lower during the last glacial maximum (LGM) than during the late Holocene. These results do not indicate the formation of glacial intermediate waters of subarctic Pacific origin, but rather the large contribution of high-nutrient water masses such as the Antarctic Intermediate Water, implying that the regional circulation pattern during the LGM was similar to that of modern times. Benthic foraminiferal assemblages underwent major changes in response to changes in dissolved oxygen concentrations in ocean floor sediments. The lowest oxygen and highest nutrient conditions, marked by dysoxic taxa and negative values of benthic foraminiferal δ13C, occurred during the Bølling/Allerød (B/A) and Pre-Boreal warming events. Dysoxic conditions in this region during these intervals were possibly caused by high surface–water productivity at times of reduced intermediate–water ventilation in the northwestern Pacific. The benthic assemblages show dysoxic events on approx. 100- to 200-year cycles during the B/A, reflecting centennial-scale productivity changes related to freshwater cycles and surface–water circulation in the North Pacific.
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References
Ahagon N, Ohkushi K, Uchida M, Mishima M (2003) Mid-depth circulation in the northwest Pacific during the last deglaciation: evidence from foraminiferal radiocarbon ages. Geophys Res Lett 30:2097 doi:10.1029/2003GL018287
Crusius J, Pedersen TF, Kienast S, Keigwin L, Labeyrie L (2004) Influence of northwest Pacific productivity on North Pacific Intermediate Water oxygen concentrations during the Bølling-Allerød interval (14.7–12.9 ka). Geology 32:633–636
Ikehara K, Ohkushi K, Shibahara A, Hoshiba M (2006) Change of bottom water conditions at intermediate depths of the Oyashio region, NW Pacific over the past 20,000 yrs. Global Planet Change 53:78–91
Kawahata H (1999) Fluctuation in the ocean environment within the western Pacific warm pool during Late Pleistocene. Paleoceanography 14:639–652
Kawahata H, Ohkushi K, Hatakeyama Y (1999) Comparison of the fluctuation of biogenic sedimentation in the boreal and austral middle latitude of the western Pacific during the late Pleistocene. J Oceanogr 55:747–761
Keigwin LD (1998) Glacial-age hydrography of the far northwest Pacific Ocean. Paleoceanography 13:323–339
Keigwin LD, Jones GA, Froelich PN (1992) A 15000 year paleoenvironmental record from Meiji Seamount, far northwestern Pacific. Earth Planet Sci Lett 111:425–440
Kemp AES (1996) Laminated sediments as paleo-indicators. Paleoclimatology and paleoceanography from laminated sediments. Geological Society, London, Special Publications 116
Kennett JP, Cannariato KG, Hendy IL, Behl RJ (2000) Carbon isotopic evidence for methane hydrate instability during Quaternary interstadials. Science 288:128–133
Koizumi I, Tada R, Narita H, Irino T, Aramaki T, Oba T, Yamamoto H (2006) Paleoceanographic history around the Tsugaru Strait between the Japan Sea and the Northwest Pacific Ocean since 30 cal kyr BP. Palaeogeogr Palaeoclimatol Palaeoecol 232:36–52
Kuroyanagi A, Kawahata H, Narita H, Ohkushi K, Aramaki T (2006) Reconstruction of paleoenvironmental changes based on the planktonic foraminiferal assemblages off Shimokita (Japan) in the northwestern North Pacific. Global Planet Change 53:92–107
Lee KE, Bahk JJ, Narita H (2003) Temporal variations in productivity and planktonic ecological structure in the East Sea (Japan) since the last glaciation. Geo-Mar Lett 23:125–129 doi:10.1007/s00367-003-0132-3
Matsumoto K, Lynch-Stieglitz J (1999) Similar glacial and Holocene deep water circulation inferred from southeast Pacific benthic foraminiferal carbon isotope composition. Paleoceanography 14:149–163
Mazzullo JM, Meyer A, Kidd RB (1988) New sediment classification scheme for the Ocean Drilling Program. In: Mazzullo J, Graham AG (eds) Handbook for Shipboard Sedimentologists. ODP Tech Note 8:45–67
McCorkle DC, Keigwin LD (1994) Depth profiles of δ13C in bottom water and core top C. wuellerstorfi on the Ontong Java Plateau and Emperor Seamounts. Paleoceanography 9:197–208
Narita H, Sato M, Tsunogai S, Murayama M, Ikehara M, Nakatsuka T, Wakatsuchi M, Harada N, Ujiie Y (2002) Biogenic opal indicating less productive northwestern North Pacific during the glacial ages. Geophys Res Lett 29 doi:10.1029/2001GL014320
Ono A, Takahashi K, Katsuki K, Okazaki Y, Sakamoto T (2005) The Dansgaard-Oeschger cycles discovered in the up stream source region of the North Pacific Intermediate Water formation. Geophys Res Lett 32 doi:10.1029/2004GL022260
Poore RZ, Quinn TM, Verardo S (2004) Century-scale movement of the Atlantic Intertropical Convergence Zone linked to solar variability. Geophys Res Lett 31:L12214 doi:10.1029/2004GL019940
Sarnthein M, Gebhardt H, Kiefer T, Kucera M, Cook M, Erlenkeuser H (2004) Mid Holocene origin of the sea-surface salinity low in the subarctic North Pacific. Quat Sci Rev 23:2089–2099
Seki O, Ikehara M, Kawamura K, Nakatsuka T, Ohnishi K, Wakatsuchi M, Narita H, Sakamoto T (2004) Reconstruction of paleoproductivity in the Sea of Okhotsk over the last 30 kyr.. Paleoceanography 19:PA1016 doi:10.1029/2002PA000808
Shibahara A, Arayama E, Ohkushi K, Aoki K, Ito T (2006) Deglacial dysoxic events on 100 to 200 year cycle in a bathyal depth off the Shimokita Peninsula based on high resolution analysis of benthic foraminifera (in Japanese with English abstract). J Geol Soc Japan 112:166–169
Tada R, Irino T, Koizumi I (1999) Land-ocean linkages over orbital and millennial timescales recorded in late Quaternary sediments of the Japan Sea. Paleoceanography 14:236–247
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Ishizaki, Y., Ohkushi, K., Ito, T. et al. Abrupt changes of intermediate-water oxygen in the northwestern Pacific during the last 27 kyr. Geo-Mar Lett 29, 125–131 (2009). https://doi.org/10.1007/s00367-008-0128-0
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DOI: https://doi.org/10.1007/s00367-008-0128-0