期刊
SCIENCE
卷 348, 期 6231, 页码 229-232出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa0193
关键词
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资金
- Edinburgh University Principal's Career Development Scholarship
- International Centre for Carbonate Reservoirs
- Marsden Fund [U001314]
- Natural Environment Research Council [NE/I005978]
- Leverhulme Trust [RPG-2013-106]
- German Research Foundation (Deutsche Forschungsgemeinschaft) Major Research Instrumentation Program INST [144/307-1]
- Austrian National Committee (Austrian Academy of Sciences)
- NERC [NE/K000705/2, NE/I005935/1, NE/I005978/2, NE/I005978/1, NE/I005862/2] Funding Source: UKRI
- Natural Environment Research Council [NE/I005978/2, NE/I005978/1, NE/K000705/2, NE/I005862/2] Funding Source: researchfish
Ocean acidification triggered by Siberian Trap volcanism was a possible kill mechanism for the Permo-Triassic Boundary mass extinction, but direct evidence for an acidification event is lacking. We present a high-resolution seawater pH record across this interval, using boron isotope data combined with a quantitative modeling approach. In the latest Permian, increased ocean alkalinity primed the Earth system with a low level of atmospheric CO2 and a high ocean buffering capacity. The first phase of extinction was coincident with a slow injection of carbon into the atmosphere, and ocean pH remained stable. During the second extinction pulse, however, a rapid and large injection of carbon caused an abrupt acidification event that drove the preferential loss of heavily calcified marine biota.
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