Paleoceanography of the Northwestern Greenland Sea and Return Atlantic Current evolution, 35–4 kyr BP

Devendra, Dhanushka; Łącka, Magdalena; Telesiński, Maciej Mateusz; Rasmussen, Tine L.; Sztybor, Kamila; Zajączkowski, Marek

doi:10.1016/j.gloplacha.2022.103947

Cited by 5 publications

(3 citation statements)

References 125 publications

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“…This value was calculated with the Marine Reservoir Correction database (Reimer and Reimer, 2001) and the Marine20 curve (Heaton et al, 2022(Heaton et al, , 2020 using the same whale bones samples as those used by Mangerud et al (2006). For core GR02 no regional correction was used (Devendra et al, 2022;Telesiński et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

Worldwide consequences of a mid-Holocene cooling in the Nordic Seas

Telesiński¹,

Zajączkowski²

2023

Preprint

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Apart from long-term changes, the Earth’s climate has been punctuated by numerous short-lived events that had a tremendous influence on terrestrial and marine ecosystems. The present interglacial is a relatively warm and stable period, especially compared to the preceding glacial time. However, several prominent cooling events have been identified within the Holocene, some of them of overregional importance. Based on previously published marine records from the Nordic Seas, we describe for the first time an event centered around 6.7 ka BP. Paleoceanographic proxies along the North Atlantic Drift reveal a distinct subsurface water cooling, preceded by a stepwise increase in sea-ice cover in the eastern Fram Strait. The results indicate that the onset of deep convection in the Greenland Sea and the westward shift of the main flow of Atlantic Water allowed sea-ice advection from the Barents Sea. The increased sea-ice cover weakened the Atlantic Water advection. The perturbation of the overturning circulation in the eastern Nordic Seas had far-reaching consequences, including changes in deep-water circulation in the North Atlantic, cooling over vast areas of both hemispheres, and weakening of the East Asian monsoon. The described events show that, during a relatively warm and stable interval, a fairly local cooling can occur, and the resulting sequence of environmental changes can spread globally. Understanding the mechanisms behind events that occur within generally stable intervals is invaluable for future climate predictions.

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Section: Methodsmentioning

confidence: 99%

Worldwide consequences of a mid-Holocene cooling in the Nordic Seas

Telesiński¹,

Zajączkowski²

2023

Preprint

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“…Examples of circum-Greenland studies where Marine20 was used, while the ages were corrected by an outdated ΔR value are plenty (Olsen et al, 2022;Devendra et al, 2022;Sha et al, 2022;Peral et al, 2022;Allaart et al, 2021) and this has unfortunately lead to errors in the final age models. To simplify the discussion and to enable us to cite previously used regional reservoir age correction values, we introduce the term ΔRxx where xx stands for the publication year of calibration curve.…”

Section: The Marine20 Calibration Curvementioning

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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“…The calibration of a radiocarbon date using the Ma-rine20 curve but corrected by an old (pre-2020) R value simply results in the wrong final calibrated age, so it is crucial to use the appropriate updated R value for the new curve. Examples of circum-Greenland studies where Ma-rine20 was used, while the ages were corrected by an outdated R value, are plenty (Olsen et al, 2022;Devendra et al, 2022;Sha et al, 2022;Peral et al, 2022;Allaart et al, 2021), and this has unfortunately led to errors in the final age models. To simplify the discussion and to enable us to cite previously used regional reservoir age correction values, we use the term R xx where xx stands for the publication year of calibration curve.…”

Section: The Marine20 Calibration Curvementioning

confidence: 99%

The marine reservoir age of Greenland coastal waters

Pearce,

Özdemir,

Forchhammer Mathiasen

et al. 2023

Geochronology

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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, 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.

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Paleoceanography of the Northwestern Greenland Sea and Return Atlantic Current evolution, 35–4 kyr BP

Cited by 5 publications

References 125 publications

Worldwide consequences of a mid-Holocene cooling in the Nordic Seas

Worldwide consequences of a mid-Holocene cooling in the Nordic Seas

The marine reservoir age of Greenland coastal waters

The marine reservoir age of Greenland coastal waters

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