New marine ΔR values for Arctic Canada☆

Coulthard, Roy D.; Furze, Mark F.A.; Pieńkowski, Anna J.; Nixon, F. Chantel; England, John

doi:10.1016/j.quageo.2010.03.002

Cited by 107 publications

(110 citation statements)

References 101 publications

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“…M. truncata) and deposit feeders (e.g. P. arctica), which may lead to discrepancies in age determination if "old" carbon is present in the system, the so-called Portlandia effect (Coulthard et al, 2010;England et al, 2013). In the case of AI07-14G in Placentia Bay, however, there is no neighboring carbonate-rich bedrock that might lead to such offsets, which is also recognized by the consistency of the measured radiocarbon ages of the different organisms (Table 1; Fig.…”

Section: Discussionmentioning

confidence: 99%

A multi-proxy reconstruction of oceanographic conditions around the Younger Dryas–Holocene transition in Placentia Bay, Newfoundland

Pearce¹,

Seidenkrantz²,

Kuijpers³

et al. 2014

Marine Micropaleontology

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Section: Discussionmentioning

confidence: 99%

A multi-proxy reconstruction of oceanographic conditions around the Younger Dryas–Holocene transition in Placentia Bay, Newfoundland

Pearce¹,

Seidenkrantz²,

Kuijpers³

et al. 2014

Marine Micropaleontology

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“…2) was constructed by using Markov chain Monte Carlo Bayesian methods based on seven AMS dates of hand-picked foraminiferal 14 C and four unambiguous inflection points where our RPI record was tied to published paleomagnetic curves (45,46) (SI Materials and Methods and Table S2). All dates presented are calibrated with the Marine09 dataset (47), with a local ΔR of 335 ± 85 years applied to all samples (48) and an additional variable carbon reservoir within epishelf stages assuming a fixed carbon pool because of isolation by the strong perennial ice cover (49, 50) (SI Materials and Methods and Table S1). Ages beyond the lowest accepted 14 C sample were calculated by extrapolation of the sedimentation rate of the lowest model section.…”

Section: Methodsmentioning

confidence: 99%

Holocene dynamics of the Arctic's largest ice shelf

Antoniades

Francus

Pienitz

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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Ice shelves in the Arctic lost more than 90% of their total surface area during the 20th century and are continuing to disintegrate rapidly. The significance of these changes, however, is obscured by the poorly constrained ontogeny of Arctic ice shelves. Here we use the sedimentary record behind the largest remaining ice shelf in the Arctic, the Ward Hunt Ice Shelf (Ellesmere Island, Canada), to establish a long-term context in which to evaluate recent ice-shelf deterioration. Multiproxy analysis of sediment cores revealed pronounced biological and geochemical changes in Disraeli Fiord in response to the formation of the Ward Hunt Ice Shelf and its fluctuations through time. Our results show that the ice shelf was absent during the early Holocene and formed 4,000 years ago in response to climate cooling. Paleoecological data then indicate that the Ward Hunt Ice Shelf remained stable for almost three millennia before a major fracturing event that occurred ∼1,400 years ago. After reformation ∼800 years ago, freshwater was a constant feature of Disraeli Fiord until the catastrophic drainage of its epishelf lake in the early 21st century.climate change | glaciology | paleoceanography | geochemistry

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“…Schlitzer, 2007). In Greenland ΔR values between 0 and 350 years have been applied (Hjort, 1973;Lloyd, 2006;Jennings et al, 2011), and it should be noted that in some cases different authors have used different ΔR values for the same area (Coulthard et al, 2010). One way to establish ΔR values is to compare marine radiocarbon ages with volcanic ash horizons (tephra) of known age (e.g.…”

Section: Notes On Chronologymentioning

confidence: 99%