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| Harada, Naomi; Sato, Miyako; Sakamoto, Tatsuhiko. |
| [1] We present records of phytoplankton-produced alkenones down a long piston core, which reveal changes of sea surface temperature (SST) and sea surface salinity (SSS) in the southwestern Okhotsk Sea over the past 120 ka. Between 20 and 60 ka B. P., alkenone-derived temperatures typically increased by 6 degrees C-8 degrees C from periods corresponding, within a few hundred years, to stadials to those corresponding to interstadials recorded in Greenland ice cores. The abundance of C-37:4 alkenone relative to total C37 alkenones (percent C-37:4), a possible proxy for salinity, indicated that during most low SSS was associated with high SST. The warm freshwater events might be related to ( 1) a decline in the supply of saline water entering the Okhotsk Sea... |
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| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00237/34826/33302.pdf |
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| Rella, Stephan F.; Tada, Ryuji; Nagashima, Kana; Ikehara, Minoru; Itaki, Takuya; Ohkushi, Ken'Ichi; Sakamoto, Tatsuhiko; Harada, Naomi; Uchida, Masao. |
| 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.... |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00265/37642/36754.pdf |
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