Ocean Carbon Storage across the middle Miocene: a new interpretation for the Monterey Event.

摘要: The Miocene Climatic Optimum (MCO, 14–17 Ma) was ~3–4 °C warmer than present, similar to estimates for 2100. Coincident with the MCO is Monterey positive carbon isotope (δ13C) excursion, oceans more depleted in 12C relative 13C any time past 50 Myrs. long-standing Hypothesis uses this excursion invoke massive marine organic burial and draw-down of atmospheric CO2 as a cause subsequent Climate Transition Antarctic glaciation. However, hypothesis cannot explain multi-Myr lag between δ13C global cooling. We use planktic foraminiferal B/Ca, δ11B, δ13C, Mg/Ca reconstruct surface ocean carbonate chemistry temperature. propose that associated elevated oceanic dissolved inorganic caused by volcanic degassing, warming, sea-level rise. A key negative feedback warm climate on drowned continental shelves. In study, authors data temperature from 16.5 11 Ma size tropical eastern Indian Ocean look at causes Excursion (ME). They find relationship (DIC) ME one DIC maxima events.