TY - JOUR
T1 - Productivity changes in the Bering Sea during the late Quaternary
AU - Okazaki, Yusuke
AU - Takahashi, Kozo
AU - Asahi, Hirofumi
AU - Katsuki, Kota
AU - Hori, Joichi
AU - Yasuda, Hisato
AU - Sagawa, Yuko
AU - Tokuyama, Hidekazu
N1 - Funding Information:
We would like to express our appreciation to all the scientists, technicians, captain and crew of the R/V Hakuho-maru, for their able assistance in collecting the piston cores during Cruise KH99-3. Many thanks are extended to the Bering Sea paleoceanography working group members for providing valuable suggestions. The manuscript was greatly improved by constructive comments and suggestions from two anonymous reviewers and Dr. R. Jordan. Dr. Jordan also provided English editing of the manuscript. This study was supported by the following research programs: MEXT Grants-in-Aid-for Scientific Research B1 Project No. 13440152, B2 Project No. 15310001 and JSPS B Project No. 17310009.
PY - 2005/8
Y1 - 2005/8
N2 - 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.
AB - 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.
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U2 - 10.1016/j.dsr2.2005.07.003
DO - 10.1016/j.dsr2.2005.07.003
M3 - Article
AN - SCOPUS:33644544697
SN - 0967-0645
VL - 52
SP - 2150
EP - 2162
JO - Deep-Sea Research Part II: Topical Studies in Oceanography
JF - Deep-Sea Research Part II: Topical Studies in Oceanography
IS - 16-18
ER -
