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

查看全文 作　　者：LIU Zhifei, XU Jian, TIAN Jun & WANG Pinxian Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

出　　处：《Chinese Science Bulletin》索引2003年第48卷第17期,共8页

基　　金：supported by the National Key Basic Research Development Project of China(Grant No.G2000078505);the National Natural Science Foundation of China(Grant Nos.49999560 and 40102010). 摘　　要：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 con-tents 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 cy-cles. The results indicate statistically that the highest car-bonate accumulation rate leads the lightest d 18O by about 3.6 ka at transitions from glacials to interglacials, and that the strongest carbonate dissolution lags the lightest d 18O 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 atmos-pheric CO2 to deep sea at the interglacial-glacial transitions. The adjustable function of the calcium carbonate pump for the deep-sea 23CO- concentration directly controls parts of global changes in atmospheric CO2, and contributes the global carbon cycle system during the Quaternary. 关键词：中国南海碳酸钙第四纪冰川旋回海洋钻探图古气候

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

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