Calcium carbonate pump during Quaternary glacial cycles in the South China Sea

Online Access: Get full text
doi: 10.1007/BF03184069
Author(s): Liu Zhifei; Xu Jian; Tian Jun; Wang Pinxian
Author Affiliation(s): Primary:
Tongji University, Laboratory of Marine Geology, Shanghai, China
Volume Title: Chinese Science Bulletin
Source: Chinese Science Bulletin, 48(17), p.1862-1869. Publisher: Science Press, Beijing, China. ISSN: 1001-6538
Note: In English. 40 refs.; illus.
Summary: The preservation and dissolution of calcium carbonate (namely calcium carbonate pump) controls the pH of seawater in global oceans by its buffer effect, and in turn plays a significant role in global changes in atmospheric CO2 concentration. The results from measured carbonate contents over the past 2 Ma at ODP Site 1143 in the South China Sea provide high-resolution records to explore the process of the calcium carbonate pump during Quaternary glacial cycles. The results indicate statistically that the highest carbonate accumulation rate leads the lightest δ18O by about 3.6 ka at transitions from glacials to interglacials, and that the strongest carbonate dissolution lags the lightest δ18O by about 5.6 ka at transitions from interglacials to glacials. The calcium carbonate pump releases CO2 to the atmosphere at the glacial-interglacial transitions, but transports atmospheric CO2 to deep sea at the interglacial-glacial transitions. The adjustable function of the calcium carbonate pump for the deep-sea CO2-3 concentration directly controls parts of global changes in atmospheric CO2, and contributes the global carbon cycle system during the Quaternary.
Year of Publication: 2003
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Calcium carbonate; Carbon dioxide; Carbonate sediments; Cenozoic; Glacial environment; Interglacial environment; Leg 184; Marine environment; North Pacific; Northwest Pacific; ODP Site 1143; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Quaternary; Sediments; South China Sea; West Pacific
Coordinates: N092143 N092143 E1131707 E1131707
Record ID: 2004023317
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.