Productivity changes in the Bering Sea during the late Quaternary

Yusuke Okazaki, Kozo Takahashi, Hirofumi Asahi, Kota Katsuki, Joichi Hori, Hisato Yasuda, Yuko Sagawa, Hidekazu Tokuyama

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70 Citations (Scopus)


Changes in biological productivity of the Bering Sea have been evaluated for the late Quaternary based on biogenic opal, calcium carbonate, and microfossils in two piston cores. Biological productivity increased during Marine Isotope Stage (MIS) 1 after the last glaciation. During the last deglaciation, two pronounced peaks of calcium carbonate content were observed at ca. 2400 m water depth, which can be explained by the "CaCO3 compensation hypothesis" and coccolithophore blooms. Simultaneous with the CaCO3 peaks, oxygen-poor deep water was apparently distributed in the Aleutian Basin based on benthic foraminiferal assemblages. The low-O 2 events seem to be related to deep-water circulation and/or elevated productivity in the northwest Pacific. After the CaCO3 peak events, biogenic opal contents and diatoms increased gradually, associated with enhanced vertical mixing with an inflow of the Alaskan Stream through the eastern Aleutian Arc passes.

Original languageEnglish
Pages (from-to)2150-2162
Number of pages13
JournalDeep-Sea Research Part II: Topical Studies in Oceanography
Issue number16-18
Publication statusPublished - Aug 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Oceanography


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