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Decreasing marine biogenic calcification: A negative feedback on rising atmospheric p CO 2
Author(s) -
Zondervan Ingrid,
Zeebe Richard E.,
Rost Björn,
Riebesell Ulf
Publication year - 2001
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/2000gb001321
Subject(s) - emiliania huxleyi , coccolithophore , carbon dioxide , ocean acidification , environmental chemistry , environmental science , oceanography , particulates , total inorganic carbon , carbon fibers , carbon dioxide in earth's atmosphere , chemistry , atmospheric sciences , phytoplankton , ecology , seawater , nutrient , geology , biology , materials science , composite number , composite material
In laboratory experiments with the coccolithophore species Emiliania huxleyi and Gephyrocapsa oceanica , the ratio of particulate inorganic carbon (PIC) to particulate organic carbon (POC) production decreased with increasing CO 2 concentration ([CO 2 ]). This was due to both reduced PIC and enhanced POC production at elevated [CO 2 ]. Carbon dioxide concentrations covered a range from a preindustrial level to a value predicted for 2100 according to a “business as usual” anthropogenic CO 2 emission scenario. The laboratory results were used to employ a model in which the immediate effect of a decrease in global marine calcification relative to POC production on the potential capacity for oceanic CO 2 uptake was simulated. Assuming that overall marine biogenic calcification shows a similar response as obtained for E. huxleyi or G. oceanica in the present study, the model reveals a negative feedback on increasing atmospheric CO 2 concentrations owing to a decrease in the PIC/POC ratio.