The trigger of Mid-Brunish coccolithophore bloom: evidences from coccolith geochemical and morphologic data

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Author(s): Zhang, Hongrui; Stoll, Heather M.; Liu Chuanlian
Author Affiliation(s): Primary:
ETH Zurich, Zurich, Switzerland
Tongji University, China
Volume Title: AGU 2018 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2018; American Geophysical Union 2018 fall meeting, Washington, DC, Dec. 10-14, 2018. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Several coccolithophores bloom event have been discovered during the Pleistocene. Among these evolutionary events, the Mid-Brunish Gephyrocapsa caribbeanica bloom can be discovered globally. During this event, the coccolith calcium carbonate accumulate rate increased about 5-10 times larger than the post and pre-period, which may altered the ocean carbon cycle dramatically (e.g. Bark et al., 2006). However, the trigger of this event is still indeterminate. Rickaby et al. (2007) suggested the low eccentricity extending the growth days of coccolithophore in the high latitude. While other researches, who focused on the glacial-interglacial variations during the Mid-Brunish bloom event, always attributed the dynamic of coccolithophoric productivity to the migration of polar front or the monsoon variations (e.g. Marino et al., 2018; Saavedra-Pellitero et al., 2017). Moreover, most of the studies focused on the mid or high latitude. In this study, we measured the coccolith geochemical and morphologic data from a core in the tropical Pacific, ODP 807 in the last 800 kyr to reveal the mechanism driving the cococlith bloom, especially some processes beyond the glacial-interglacial.
Year of Publication: 2018
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Brunhes Chron; Cenozoic; Coccolithophoraceae; Equatorial Pacific; Geochemistry; Leg 130; Microfossils; North Pacific; Northwest Pacific; ODP Site 807; Ocean Drilling Program; Ontong Java Plateau; Pacific Ocean; Quaternary; Upper Quaternary; West Pacific
Coordinates: N033622 N033626 E1563730 E1563728
Record ID: 2019040274
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