2016
DOI: 10.1130/abs/2016am-282670
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Charcoal Evidence That Rising Atmospheric Oxygen Terminated Early Jurassic Ocean Anoxia

Abstract: The Toarcian Oceanic Anoxic Event (T-OAE) was characterized by a major disturbance to the global carbon(C)-cycle, and depleted oxygen in Earth's oceans resulting in marine mass extinction. Numerical models predict that increased organic carbon burial should drive a rise in atmospheric oxygen (pO 2 ) leading to termination of an OAE after B1 Myr. Wildfire is highly responsive to changes in pO 2 implying that fire-activity should vary across OAEs. Here we test this hypothesis by tracing variations in the abundan… Show more

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Cited by 7 publications
(7 citation statements)
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“…Such an increase is consistent with newer analyses that also indicate a rise in AOC between 180 and 160 Myr ago (Mills et al, 2016;Baker et al, 2017). Based on these values and on Tair estimates provided by Retallack (2009), our calculations show that ρair increased between 1 and 6 % (depending on the model) during the Early-Middle Jurassic ( 1).…”
Section: Paleoatmospheric Conditions Over the Last 180 Myrsupporting
confidence: 90%
“…Such an increase is consistent with newer analyses that also indicate a rise in AOC between 180 and 160 Myr ago (Mills et al, 2016;Baker et al, 2017). Based on these values and on Tair estimates provided by Retallack (2009), our calculations show that ρair increased between 1 and 6 % (depending on the model) during the Early-Middle Jurassic ( 1).…”
Section: Paleoatmospheric Conditions Over the Last 180 Myrsupporting
confidence: 90%
“…Higher precipitation rates are hypothesized to have occurred during the Toarcian event based on ocean-atmosphere models 39 and evidence of enhanced continental weathering [40][41][42][43][44] , which suggest a warmer and wetter climate. However, an increase of warm-and drought-adapted plants through the CIE, in association with abundant charcoal recorded elsewhere 45 , suggests a warmer but drier climate. We infer strong seasonality during the Toarcian event with extreme wet and dry seasons, through which drought-adapted plants were successful.…”
Section: Environmental Connections and Climatementioning
confidence: 89%
“…Recently, it was proposed that the increase in humid conditions favoured the development of large organic-rich lake systems, which significantly contributed to the reduction of the pCO 2 (Xu et al, 2017). The enhancement of fire activity during the T-OAE, and in particular during its termination, may have played an important role in terminating ocean anoxia (Baker et al, 2017).…”
Section: Depositional Conditions During the T-oae Across The Alpine Tmentioning
confidence: 99%