2018
DOI: 10.1126/science.aap8525
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Postimpact earliest Paleogene warming shown by fish debris oxygen isotopes (El Kef, Tunisia)

Abstract: Greenhouse warming is a predicted consequence of the Chicxulub impact, but supporting data are sparse. This shortcoming compromises understanding of the impact's effects, and it has persisted due to an absence of sections that both contain suitable material for traditional carbonate- or organic-based paleothermometry and are complete and expanded enough to resolve changes on short time scales. We address the problem by analyzing the oxygen isotopic composition of fish debris, phosphatic microfossils that are r… Show more

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Cited by 41 publications
(29 citation statements)
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“…If we assume an Earth system sensitivity of 3°C or higher per CO 2 doubling (Royer, 2016), these records imply-at most-one CO 2 doubling. One exception is a~5°C warming within~100,000 years after the K-Pg boundary at the global stratotype El Kef, Tunisia (~20°N paleolatitude; MacLeod et al, 2018). This subtropical temperature record appears incompatible with our record, suggesting that either CO 2 directly before the K-Pg boundary was substantially lower (<400 ppm) than what our and most other reconstructions imply (Zhang et al, 2018; see also Figure S17) or local changes in ocean chemistry biased the temperature estimates.…”
Section: 1029/2018gl081215contrasting
confidence: 60%
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“…If we assume an Earth system sensitivity of 3°C or higher per CO 2 doubling (Royer, 2016), these records imply-at most-one CO 2 doubling. One exception is a~5°C warming within~100,000 years after the K-Pg boundary at the global stratotype El Kef, Tunisia (~20°N paleolatitude; MacLeod et al, 2018). This subtropical temperature record appears incompatible with our record, suggesting that either CO 2 directly before the K-Pg boundary was substantially lower (<400 ppm) than what our and most other reconstructions imply (Zhang et al, 2018; see also Figure S17) or local changes in ocean chemistry biased the temperature estimates.…”
Section: 1029/2018gl081215contrasting
confidence: 60%
“…After a brief "impact winter" (months to decades; Bardeen et al, 2017;Brugger et al, 2017;Taylor et al, 2018;Vellekoop et al, 2014Vellekoop et al, , 2015Vellekoop et al, , 2016, temperatures increased between~1 and 6°C depending on paleolatitude and geographic location, with the largest increases often at higher paleolatitudes (MacLeod et al, 2018;Taylor et al, 2018;Vellekoop et al, 2014;Zhang et al, 2018). After a brief "impact winter" (months to decades; Bardeen et al, 2017;Brugger et al, 2017;Taylor et al, 2018;Vellekoop et al, 2014Vellekoop et al, , 2015Vellekoop et al, , 2016, temperatures increased between~1 and 6°C depending on paleolatitude and geographic location, with the largest increases often at higher paleolatitudes (MacLeod et al, 2018;Taylor et al, 2018;Vellekoop et al, 2014;Zhang et al, 2018).…”
Section: K-pg Boundary Comentioning
confidence: 99%
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“…The effects of impact cratering have long been recognised as drivers of climate change 2,53 . Many studies have described the atmospheric effects of the end-Cretaceous Chicxulub impact structure in Mexico 49,54,55 , which resulted in global cooling of oceans and production of widespread acidic rains 56,57 . While the Yarrabubba structure dated at 2229 ± 5 Ma represents the Earth's oldest dated impact crater, its coincidence with termination of Palaeoproterozoic glacial conditions prompts further consideration of the ability of meteorite impacts to trigger climate change.…”
Section: Resultsmentioning
confidence: 99%