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Showing papers by "Lionel Carter published in 2015"

Journal Article•DOI•
Reduced ventilation and enhanced magnitude of the deep Pacific carbon pool during the last glacial period

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Luke C Skinner1, I. N. McCave1, Lionel Carter2, Stewart Fallon3, A. E. Scrivner1, François Primeau4 •
University of Cambridge1, Wellington Management Company2, Australian National University3, University of California, Irvine4
01 Feb 2015-Earth and Planetary Science Letters
TL;DR: Using radiocarbon dates of marine tephra deposited off New Zealand, this article showed that deep- (>2000 m>2000 m) and shallow sub-surface ocean-atmosphere 14C age offsets (i.e., reservoir- or ventilation ages) in the southwest Pacific increased by ∼1089 and 337 yrs respectively, reaching ∼2689 and ∼1037 yrs during the late glacial.

102 citations

Journal Article•DOI•
New magnetobiostratigraphic chronology and paleoceanographic changes across the Oligocene-Miocene boundary at DSDP Site 516 (Rio Grande Rise, SW Atlantic)

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Fabio Florindo1, Rocco Gennari2, Davide Persico2, E. Turco2, Giuliana Villa2, Pontus Lurcock1, Andrew P. Roberts3, Aldo Winkler1, Lionel Carter4, Stephen F. Pekar5, Stephen F. Pekar6 •
National Institute of Geophysics and Volcanology1, University of Parma2, Australian National University3, Victoria University of Wellington4, Lamont–Doherty Earth Observatory5, Queens College6
01 Jun 2015-Paleoceanography
TL;DR: In this paper, the authors used magnetobiostratigraphic data for the late Oligocene through early Miocene at the Deep Sea Drilling Project (DSDP) Hole 516F to provide a significantly revised age model, which permits reevaluation of developments that led to the Mi-1 glacial event at the oligocene-Miocene boundary.
Abstract: New magnetobiostratigraphic data for the late Oligocene through early Miocene at Deep Sea Drilling Project (DSDP) Hole 516F provide a significantly revised age model, which permits reevaluation of developments that led to the Mi-1 glacial event at the Oligocene-Miocene boundary. Our new high-resolution paleomagnetic study, which is supported by quantitative calcareous nannofossil and planktonic foraminiferal analyses, significantly refines previous age models for Oligocene-Miocene sediments from DSDP Hole 516F, with ages that are systematically younger than those previously determined. In some parts of the Oligocene, the discrepancy with previous studies exceeds 450 kyr. Based on this new age model, we infer a progressive increase in sedimentation rate and paleoproductivity between circa 23.9 Ma and circa 22.9 Ma, with the highest rate coinciding with the Mi-1 glacial event at the Oligocene-Miocene boundary. This productivity increase would have resulted in higher rates of carbon burial and in turn a drawdown of atmospheric CO2. Immediately afterward, an abrupt decrease in sedimentation rate and paleoproductivity suggests that the Mi-1 deglaciation was associated with decreased carbon input into the ocean. Elevated sedimentation rates are also documented at ~24.5 Ma, coincident with the Oi2D glacioeustatic event. The presence of volcanic material within the sediments during these glacial events is interpreted to have resulted from redeposition of sediment scoured from nearby sites on the Rio Grande Rise due to transient variations in bottom water flow patterns.

17 citations