Coccolithophore carbonate counter pump covaried with ocean carbon cycle changes during the Mid-Miocene  

中新世颗石藻碳酸盐反向泵与海洋碳循环协同变化

作　　者：Lishun Sun Xiaobo Jin Xiang Su Chuanlian Liu 孙立舜;金晓波;苏翔;刘传联

机构地区：[1]State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China [2]Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China

出　　处：《Science Bulletin》2025年第5期600-603,共4页科学通报(英文版)

摘　　要：Coccolithophores are a kind of marine unicellular calcifying algae.They serve as a biological pump which converts CO_(2)to particulate organic carbon(POC)through photosynthesis.On the other hand,coccolithophores can produce calcite scales around a cell through calcification.The produced calcareous scales or particulate inorganic carbon(PIC)can be buried in marine sediments,known as coccoliths.The molar ratio of PIC and POC(PIC:POC)produced by coccolithophores can determine whether the net effect of their growth is an oceanic CO_(2)sink or source[1].The physiological processes of coccolithophores can significantly affect seawater carbonate chemistry and regional sea-air CO_(2)exchange[2].Coccolithophores contribute to more than 50%of the marine biogenic PIC productivity and nearly half of the calcite inventory in global surface sediments,which can influence the oceanic sink of atmospheric CO_(2)by reducing the ocean CO_(2)buffering capacity[3].Therefore,evaluating the relationship between the dual-carbon pumps associated with coccolithophores and environmental changes is important,because coccolithophores play a crucial role in the ocean carbon biogeochemical cycle that works in Earth’s climate change.

关 键 词：ocean CARBONATE scales 

分 类 号：P73[天文地球—海洋科学]