Interlaboratory comparison of 10Be concentrations in two ice cores from Central West Antarctica

Woodruff, Thomas E.; Welten, K. C.; Caffee, Marc W.; Nishiizumi, K.

doi:10.1016/j.nimb.2012.08.033

Cited by 6 publications

(4 citation statements)

References 15 publications

(18 reference statements)

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“…and measured at the Tandem Laboratory in Uppsala, Sweden. Annual NEEM and WDC 10 Be concentrations were determined according to Woodruff et al 43. and Sigl et al 44.…”

Section: Methodsmentioning

confidence: 99%

Multiradionuclide evidence for the solar origin of the cosmic-ray events of AD 774/5 and 993/4

et al. 2015

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The origin of two large peaks in the atmospheric radiocarbon (14C) concentration at AD 774/5 and 993/4 is still debated. There is consensus, however, that these features can only be explained by an increase in the atmospheric 14C production rate due to an extraterrestrial event. Here we provide evidence that these peaks were most likely produced by extreme solar events, based on several new annually resolved 10Be measurements from both Arctic and Antarctic ice cores. Using ice core 36Cl data in pair with 10Be, we further show that these solar events were characterized by a very hard energy spectrum with high fluxes of solar protons with energy above 100 MeV. These results imply that the larger of the two events (AD 774/5) was at least five times stronger than any instrumentally recorded solar event. Our findings highlight the importance of studying the possibility of severe solar energetic particle events.

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“…and measured at the Tandem Laboratory in Uppsala, Sweden. Annual NEEM and WDC 10 Be concentrations were determined according to Woodruff et al 43. and Sigl et al 44.…”

Section: Methodsmentioning

confidence: 99%

Multiradionuclide evidence for the solar origin of the cosmic-ray events of AD 774/5 and 993/4

et al. 2015

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“…Ice samples of 300–700 g were weighed, melted, and acidified with a solution containing ~0.18 mg Be carrier. The samples were passed through 30 micron Millipore filter, and loaded on cation exchange columns from which the Be fraction was eluted following established procedures 88 , 89 . The 10 Be/ 9 Be ratios of samples and blanks were measured by AMS at PRIME Lab.…”

Section: Methodsmentioning

confidence: 99%

Deep-water circulation changes lead North Atlantic climate during deglaciation

et al. 2019

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Constraining the response time of the climate system to changes in North Atlantic Deep Water (NADW) formation is fundamental to improving climate and Atlantic Meridional Overturning Circulation predictability. Here we report a new synchronization of terrestrial, marine, and ice-core records, which allows the first quantitative determination of the response time of North Atlantic climate to changes in high-latitude NADW formation rate during the last deglaciation. Using a continuous record of deep water ventilation from the Nordic Seas, we identify a ∼400-year lead of changes in high-latitude NADW formation ahead of abrupt climate changes recorded in Greenland ice cores at the onset and end of the Younger Dryas stadial, which likely occurred in response to gradual changes in temperature- and wind-driven freshwater transport. We suggest that variations in Nordic Seas deep-water circulation are precursors to abrupt climate changes and that future model studies should address this phasing.

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“…Sample masses ranged between 100 and 450 g, resulting in median overall quantification uncertainties of less than 4-7%. The 10 Be/ 9 Be ratios of samples and blanks were measured relative to welldocumented 10 Be standards 13 by AMS at Purdue's PRIME laboratory (WDC, NEEM-2011-S1, Tunu2013) and Uppsala University (NGRIP) 58,59 . Results were corrected for an average blank 10 Be/ 9 Be ratio, corresponding to corrections of 2-10% of the measured 10 Be/ 9 Be ratios. )…”

Section: High-resolution Measurements Of 10 Be In Ice Cores Using Accmentioning

confidence: 99%

Timing and climate forcing of volcanic eruptions for the past 2,500 years

Sigl

Winstrup

McConnell

et al. 2015

Nature

966

1,255

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Volcanic eruptions contribute to climate variability, but quantifying these contributions has been limited by inconsistencies in the timing of atmospheric volcanic aerosol loading determined from ice cores and subsequent cooling from climate proxies such as tree rings. Here we resolve these inconsistencies and show that large eruptions in the tropics and high latitudes were primary drivers of interannual-to-decadal temperature variability in the Northern Hemisphere during the past 2,500 years. Our results are based on new records of atmospheric aerosol loading developed from high-resolution, multi-parameter measurements from an array of Greenland and Antarctic ice cores as well as distinctive age markers to constrain chronologies. Overall, cooling was proportional to the magnitude of volcanic forcing and persisted for up to ten years after some of the largest eruptive episodes. Our revised timescale more firmly implicates volcanic eruptions as catalysts in the major sixth-century pandemics, famines, and socioeconomic disruptions in Eurasia and Mesoamerica while allowing multi-millennium quantification of climate response to volcanic forcing.

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Interlaboratory comparison of 10Be concentrations in two ice cores from Central West Antarctica

Cited by 6 publications

References 15 publications

Multiradionuclide evidence for the solar origin of the cosmic-ray events of AD 774/5 and 993/4

Multiradionuclide evidence for the solar origin of the cosmic-ray events of AD 774/5 and 993/4

Deep-water circulation changes lead North Atlantic climate during deglaciation

Timing and climate forcing of volcanic eruptions for the past 2,500 years

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