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yexuqing木蟲之王 (文學(xué)泰斗)
太陽系系主任
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[交流]
A climate threshold for ocean deoxygenation during the Early Cretaceous
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A climate threshold for ocean deoxygenation during the Early Cretaceous 白堊紀(jì)早期海洋脫氧的氣候閾值 ▲ 作者：Kohen W. Bauer, N. Ryan McKenzie et al. ▲鏈接： https://www.nature.com/articles/s41586-024-07876-1 ▲摘要： 在此，我們的研究顯示，在白堊紀(jì)大洋缺氧事件（OAE1a）期間海洋快速脫氧與火山二氧化碳排放和相關(guān)氣候閾值的跨越有關(guān)。此后，硅酸鹽風(fēng)化反饋和氣候恢復(fù)的緩慢步伐將再氧化的延遲事件大于1百萬年。在OAE1a結(jié)束時，重新越過這個閾值并使得海洋再氧化。 然而，在OAE1a之后，地球系統(tǒng)保持足夠的溫暖，以至于軌道驅(qū)動的氣候動力學(xué)導(dǎo)致海洋在大約10億年的時間尺度上繼續(xù)循環(huán)脫氧，并持續(xù)了1百萬年。因此，我們的結(jié)果暗示了火山作用、風(fēng)化作用和海洋氧含量之間的緊密耦合，這種耦合以氣候閾值為特征。 ▲ Abstract： Here we show that rapid ocean deoxygenation during OAE1a is linked to volcanic CO2emissions and the crossing of an associated climate threshold, after which the sluggish pace of the silicate-weathering feedback and climate recovery delayed reoxygenation for >1 Myr. At the end of OAE1a, recrossing this threshold allowed for ocean reoxygenation. Following OAE1a, however, the Earth system remained sufficiently warm such that orbitally forced climate dynamics led to continued cyclic ocean deoxygenation on approximately 100-kyr timescales for another 1 Myr. Our results thus imply a tight coupling between volcanism, weathering and ocean oxygen content that is characterized by a climate threshold. |
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