Calibrated relative sea levels constrain isostatic adjustment and ice history in northwest Greenland

Glueder, Anna; Mix, Alan C; Milne, Glenn A.; Reilly, Brendan; Clark, Jorie; Mayer, Larry A.; Fallon, Stewart; Southon, John; Padman, June; Ross, Andrew; Cronin, Thomas M.; McKay, J. L.

doi:10.1016/j.quascirev.2022.107700

Cited by 5 publications

(2 citation statements)

References 106 publications

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“…Simple box models have shown a consistent link between sea-ice cover and the radiocarbon reservoir age (Bard et al, 1994), and high-resolution studies using tephrochronology coupled with radiocarbon dates have documented North Atlantic reservoir ages of > 2000 years during deep stadials of MIS3 (Olsen et al, 2014). Despite the advice against using Marine20 in polar regions, it has already been used extensively for this purpose since its publication (Pados-Dibattista et al, 2022;Glueder et al Hansen et al, 2022;El bani Altuna et al, 2021;Brouard et al, 2021;Stevenard et al, 2022;Davies et al, 2022;Jackson et al, 2022). Since publication of Marine20, a more recent paper by the same main authors has now been published and clarifies this issue.…”

Section: The Marine20 Curve In Polar Regionsmentioning

confidence: 99%

The marine reservoir age of Greenland coastal waters

Pearce

Özdemir²,

Forchhammer

et al. 2023

Preprint

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Abstract. Knowledge of the marine reservoir age is fundamental for creating reliable chronologies of marine sediment archives based on radiocarbon dating. This age difference between the 14C age of a marine sample and that of its contemporaneous atmosphere is dependent on several factors, among others ocean circulation, water mass distribution, terrestrial runoff, upwelling, sea-ice cover and is therefore spatially heterogenous. Anthropogenic influence on the global isotopic carbon system, mostly through atmospheric nuclear tests, has complicated the determination of the regional reservoir age correction ΔR, which therefore can only be measured on historic samples of known age. In this study we expand on the few existing measurements of ΔR for the coastal waters around Greenland, by adding 92 new radiocarbon dates on mollusks from museum collections. All studied mollusk samples were collected during historic expeditions of the late 19th and early 20th centuries and besides coastal sites around Greenland, the dataset also includes localities from the western Labrador Sea, Baffin Bay, and the Iceland Sea. Together with existing measurements, the new results are used to calculate average ΔR values for different regions around Greenland, all in relation to Marine20, the most recent radiocarbon calibration curve. To support further discussions and comparison with previous datasets, we introduce the term ΔR13 where the suffix 13 refers to the previous calibration curve Marine13. Our study explores the links between the marine reservoir age and oceanography, sea ice cover, water depth, mollusk feeding habits, and the presence of carbonate bedrock. Although we provide regional averages, we encourage people to consult the full catalogue of measurements and determine a suitable ΔR for each case individually, based on the exact location including water depth. Despite this significant expansion of the regional reservoir age database around Greenland, data from the northern coast, directly bordering the Arctic Ocean remains missing.

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Section: The Marine20 Curve In Polar Regionsmentioning

confidence: 99%

The marine reservoir age of Greenland coastal waters

Pearce

Özdemir²,

Forchhammer

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Simple box models have shown a consistent link between sea-ice cover and the radiocarbon reservoir age (Bard et al, 1994), and high-resolution studies using tephrochronology coupled with radiocarbon dates have documented North Atlantic reservoir ages of > 2000 years during deep stadials of MIS3 (Olsen et al, 2014). Despite the advice against using Marine20 in polar regions, it has already been used extensively for this purpose since its publication (Pados-Dibattista et al, 2022;Glueder et al, 2022;Hansen et al, 2022;El bani Altuna et al, 2021;Brouard et al, 2021;Stevenard et al, 2022;Davies et al, 2022;Jackson et al, 2022). Since the publication of Marine20, a more recent paper by the same main authors has now been published and clarifies this issue.…”

Section: The Marine20 Curve In Polar Regionsmentioning

confidence: 99%

The marine reservoir age of Greenland coastal waters

Pearce,

Özdemir,

Forchhammer Mathiasen

et al. 2023

Geochronology

View full text Add to dashboard Cite

Abstract. Knowledge of the marine reservoir age is fundamental for creating reliable chronologies of marine sediment archives based on radiocarbon dating. This age difference between the 14C age of a marine sample and that of its contemporaneous atmosphere is dependent on several factors (among others, ocean circulation, water mass distribution, terrestrial runoff, upwelling, and sea-ice cover) and is therefore spatially heterogeneous. Anthropogenic influence on the global isotopic carbon system, mostly through atmospheric nuclear tests, has complicated the determination of the regional reservoir age correction ΔR, which therefore can only be measured in historic samples of known age. In this study we expand on the few existing measurements of ΔR for the coastal waters around Greenland, by adding 92 new radiocarbon dates on mollusks from museum collections. All studied mollusk samples were collected during historic expeditions of the late 19th and early 20th centuries, and besides coastal sites around Greenland, the new measurements also include localities from the western Labrador Sea, Baffin Bay, and the Iceland Sea. Together with existing measurements, the new results are used to calculate average ΔR values for different regions around Greenland, all in relation to Marine20, the most recent marine radiocarbon calibration curve. To support further discussions and comparison with previous datasets, we use the term ΔR13, where the suffix 13 refers to the previous calibration curve Marine13. Our study explores the links between the marine reservoir age and oceanography, sea-ice cover, water depth, mollusk feeding habits, and the presence of carbonate bedrock. Although we provide regional averages, we encourage people to consult the full catalogue of measurements and determine a suitable ΔR for each case individually, based on the exact location including water depth. Despite this significant expansion of the regional reservoir age database around Greenland, data from the northern coast, directly bordering the Arctic Ocean, remain missing.

show abstract