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

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

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 "CaCO 3 compensation hypothesis" and coccolithophore blooms. Simultaneous with the CaCO 3 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 CaCO 3 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
Volume52
Issue number16-18
DOIs
Publication statusPublished - Aug 1 2005
Externally publishedYes

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opal
calcium carbonate
productivity
deep water
last deglaciation
marine isotope stage
last glaciation
vertical mixing
microfossil
benthos
water depth
algal bloom
inflow
diatom
oxygen
basin
sea

All Science Journal Classification (ASJC) codes

  • Oceanography

Cite this

Productivity changes in the Bering Sea during the late Quaternary. / Okazaki, Yusuke; Takahashi, Kozo; Asahi, Hirofumi; Katsuki, Kota; Hori, Joichi; Yasuda, Hisato; Sagawa, Yuko; Tokuyama, Hidekazu.

In: Deep-Sea Research Part II: Topical Studies in Oceanography, Vol. 52, No. 16-18, 01.08.2005, p. 2150-2162.

Research output: Contribution to journalArticle

Okazaki, Y, Takahashi, K, Asahi, H, Katsuki, K, Hori, J, Yasuda, H, Sagawa, Y & Tokuyama, H 2005, 'Productivity changes in the Bering Sea during the late Quaternary', Deep-Sea Research Part II: Topical Studies in Oceanography, vol. 52, no. 16-18, pp. 2150-2162. https://doi.org/10.1016/j.dsr2.2005.07.003
Okazaki, Yusuke ; Takahashi, Kozo ; Asahi, Hirofumi ; Katsuki, Kota ; Hori, Joichi ; Yasuda, Hisato ; Sagawa, Yuko ; Tokuyama, Hidekazu. / Productivity changes in the Bering Sea during the late Quaternary. In: Deep-Sea Research Part II: Topical Studies in Oceanography. 2005 ; Vol. 52, No. 16-18. pp. 2150-2162.
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