Abrupt changes of intermediate water properties on the northeastern slope of the Bering Sea during the last glacial and deglacial period
| Type | Article | ||||||||
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| Date | 2012-07 | ||||||||
| Language | English | ||||||||
| Author(s) | Rella Stephan F.1, Tada Ryuji, Nagashima Kana2, Ikehara Minoru3, Itaki Takuya4, Ohkushi Ken'Ichi5, Sakamoto Tatsuhiko6, Harada Naomi2, Uchida Masao7 | ||||||||
| Affiliation(s) | 1 : Univ Tokyo, Dept Earth & Planetary Sci, Bunkyo Ku, Tokyo 1130033, Japan. 2 : Japan Agcy Marine Earth Sci & Technol, Inst Observat Res Global Change, Yokosuka, Kanagawa 2370061, Japan. 3 : Kochi Univ, Ctr Adv Marine Core Res, Nankoku, Kochi, Japan. 4 : Geol Survey Japan, AIST, Inst Geol & Geoinformat, Tsukuba, Ibaraki 305, Japan. 5 : Kobe Univ, Grad Sch Human Dev & Environm, Dept Sci Human Environm, Kobe, Hyogo 657, Japan. 6 : Japan Agcy Marine Earth Sci & Technol, Inst Res Earth Evolut, Yokosuka, Kanagawa 2370061, Japan. 7 : Natl Inst Environm Studies, Div Environm Chem, Tsukuba, Ibaraki, Japan. |
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| Source | Paleoceanography (0883-8305) (Amer Geophysical Union), 2012-07 , Vol. 27 , N. PA3203 , P. 1-18 | ||||||||
| DOI | 10.1029/2011PA002205 | ||||||||
| WOS© Times Cited | 43 | ||||||||
| Note | Auxiliary material for this article contains oxygen and carbon isotope data of benthic foraminifera Uvigerina akitaensis and Buliminella tenuata from core MR06-04 PC-23A (northeastern slope of the Bering Sea; 1002 m water depth). http://onlinelibrary.wiley.com/doi/10.1029/2011PA002205/abstract | ||||||||
| Abstract | Millennial-scale variability in the behavior of North Pacific Intermediate Water during the last glacial and deglacial period, and its association with Dansgaard-Oeschger (D-O) cycles and Heinrich events, are examined based on benthic foraminiferal oxygen and carbon isotopes (delta O-18(bf) and delta C-13(bf)) and %CaCO3 using a sediment core recovered from the northeastern slope of the Bering Sea. A suite of positive delta O-18(bf) excursions at intermediate depths of the Bering Sea, which seem at least in part associated with increases in the delta O-18(bf) gradients between the Bering and Okhotsk Seas, suggest the Bering Sea as a proximate source of intermediate water during several severe stadial episodes in the last glacial and deglacial period. Absence of such delta O-18(bf) gradients during periods of high surface productivity in the Bering and Okhotsk Seas, which we correlate to D-O interstadials, suggests a reduction in intermediate water production in the Bering Sea and subsequent introduction of nutrient-rich deep waters from the North Pacific into intermediate depths of the Bering Sea. We argue that a reorganization of atmospheric circulation in the high-latitude North Pacific during severe cold episodes in the last glacial and deglacial period created favorable conditions for brine rejection in the northeastern Bering Sea. The resulting salinity increase in the cold surface waters could have initiated intermediate (and deep) water formation that spread out to the North Pacific. | ||||||||
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