902 resultados para Arab theater


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Signatur des Originals: S 36/F12219

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Signatur des Originals: S 36/G01712

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Signatur des Originals: S 36/G02686

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Signatur des Originals: S 36/G13856

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Signatur des Originals: S 36/G03873

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Signatur des Originals: S 36/G13874

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Signatur des Originals: S 36/G14532

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Signatur des Originals: S 36/G14533

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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.