Decreasing marine biogenic calcification: A negative feedback on rising atmospheric pCO(2)

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
2001
Editor: 
Journal Title: 
Global Biogeochemical Cycles
Journal Date: 
Jun
Place Published: 
Tertiary Title: 
Volume: 
15
Issue: 
2
Pages: 
507-516
Section / Start page: 
Publisher: 
ISBN Number: 
0886-6236
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000169233200017
LDEO Publication Number: 
Call Number: 
Abstract: 

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 CO2 concentration ([CO2]). This was due to both reduced PIC and enhanced POC production at elevated [CO2]. Carbon dioxide concentrations covered a range from a preindustrial level to a value predicted for 2100 according to a "business as usual" anthropogenic CO2 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 CO2 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 CO2 concentrations owing to a decrease in the PIC/POC ratio.

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