a coccolithophore concept for constraining the cenozoic carbon cycle
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ID: 169922
2007
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Abstract
An urgent question for future climate, in light of increased burning of
fossil fuels, is the temperature sensitivity of the climate system to
atmospheric carbon dioxide (pCO>sub>2). To date, no direct proxy for past
levels of pCO2 exists beyond the reach of the polar ice core records.
We propose a new methodology for placing a constraint on pCO2 over the
Cenozoic based on the physiological plasticity of extant coccolithophores.
Specifically, our premise is that the contrasting calcification
tolerance of various extant
species of coccolithophore to raised pCO2 reflects an "evolutionary
memory" of past atmospheric composition. The different times of evolution
of certain morphospecies allows an upper constraint of past pCO2 to be
placed on Cenozoic timeslices. Further, our hypothesis has implications for
the response of marine calcifiers to ocean acidification. Geologically
"ancient" species, which have survived large changes in ocean chemistry,
are likely more resilient to predicted acidification.
| Reference Key |
henderiks2007biogeosciencesa
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|---|---|
| Authors | ;J. Henderiks;R. E. M. Rickaby |
| Journal | tetrahedron letters |
| Year | 2007 |
| DOI |
10.5194/bg-4-323-2007
|
| URL | |
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