7Be and 10Be concentrations in recent firn and ice at Law Dome, Antarctica

Smith, A. M.; Fink, David; Child, David; Levchenko, V.A.; Morgan, Vin; Curran, Mark A. J.; Etheridge, D. M.; Elliott, G

doi:10.1016/s0168-583x(00)00281-0

Cited by 32 publications

(27 citation statements)

References 27 publications

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“…Raisbeck et al, 1978). 10 Be records have now been produced from multiple polar ice core sites, in both Greenland (e.g., Dye 3, GRIP, GISP2, Renland (Beer et al, 1990(Beer et al, , 1991Yiou et al, 1997;Finkel and Nishiizumi, 1997;Aldahan et al, 1998;Heikkilä et al, 2008b)) and Antarctica (e.g., Dome Concordia, South Pole, Dome Fuji, Taylor Dome, Queen Maud Land, Dronning Maud Land and Law Dome (Raisbeck et al, 1990;Steig et al, 1996;Aldahan et al, 1998;Smith et al, 2000;Moraal et al, 2005;Pedro et al, 2006;Horiuchi et al, 2008;Pedro et al, 2009)). Particular care in sample preparation and measurement is required for samples from Law Dome, where 10 Be concentrations are the lowest of all of these sites.…”

Section: J B Pedro Et Al: High Resolution 10 Be In Law Dome Icementioning

confidence: 99%

“…2. This updated procedure, which was used on the DSS0506-core, DSS0809-core and DSS0910-core, is based on the methods for extraction of 10 Be from aqueous samples described by Child et al (2000) and Smith et al (2000), with recent revisions aimed at improving efficiency and reducing levels of the isobaric AMS interferant boron.…”

Section: Extraction Of 10 Be From Ice and Ams Measurementmentioning

confidence: 99%

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High-resolution records of the beryllium-10 solar activity proxy in ice from Law Dome, East Antarctica: measurement, reproducibility and principal trends

et al. 2011

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Abstract. Three near-monthly resolution 10 Be records are presented from the Dome Summit South (DSS) ice core site, Law Dome, East Antarctica. The chemical preparation and Accelerator Mass Spectrometer (AMS) measurement of these records is described. The reproducibility of 10 Be records at DSS is assessed through intercomparison of the ice core data with data from two previously published and contemporaneous snow pits. We find generally good agreement between the five records, comparable to that observed between other trace chemical records from the site. This result allays concerns raised by a previous Antarctic study (Moraal et al., 2005) about poor reproducibility of ice core 10 Be records. A single composite series is constructed from the three ice cores providing a monthly-resolved record of 10 Be concentrations at DSS over the past decade (1999 to 2009). To our knowledge, this is the first published ice core data spanning the recent exceptional solar minimum of solar cycle 23. 10 Be concentrations are significantly correlated to the cosmic ray flux recorded by the McMurdo neutron monitor (r xy = 0.64, with 95 % CI of 0.53 to 0.71), suggesting that solar modulation of the atmospheric production rate may explain up to ∼40 % of the variance in 10 Be concentrations at DSS. Sharp concentration peaks occur in most years during the summer-to-autumn, possibly caused by stratospheric incursions. Our results underscore the presence of both production and meteorological signals in ice core 10 Be data.

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Section: J B Pedro Et Al: High Resolution 10 Be In Law Dome Icementioning

confidence: 99%

Section: Extraction Of 10 Be From Ice and Ams Measurementmentioning

confidence: 99%

High-resolution records of the beryllium-10 solar activity proxy in ice from Law Dome, East Antarctica: measurement, reproducibility and principal trends

et al. 2011

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“…1), has been used with success in previous studies [20,21], indicating that it was not our sample preparation method per se that was the problem. It was also possible to rule out UTAS and the Antarctic ice itself as the contamination source, as partial procedural blanks started using deionised water at ANSTO were similarly contaminated.…”

Section: Investigation Of the Source Of The Boron Contaminationmentioning

confidence: 99%

Reprocessing of 10B-contaminated 10Be AMS targets

Simon

Pedro

Smith

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

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a b s t r a c t 10 Be accelerator mass spectrometry (AMS) is an increasingly important tool in studies ranging from exposure age dating and palaeo-geomagnetism to the impact of solar variability on the Earth's climate. High levels of boron in BeO AMS targets can adversely impact the quality of 10 Be measurements through interference from the isobar 10 B. Numerous methods in chemical sample preparation and AMS measurement have been employed in order to reduce the impact of excessive boron rates. We present details of a method developed to chemically reprocess a set of forty boron-contaminated BeO targets derived from modern Antarctic ice. Previously, the excessive boron levels in these samples, as measured in an argon-filled absorber cell preceding the ionisation detector, had precluded routine AMS measurement. The procedure involved removing the BeO + Nb mixture from the target holders and dissolving the BeO in hot concentrated H 2 SO 4 . The solution was then heated with HF to remove the boron as volatile BF 3 before re-precipitating as Be(OH) 2 and calcining to BeO. This was again mixed with niobium and pressed into fresh target holders. Following reprocessing, the samples gave boron rates reduced by 10-100Â, which were sufficiently low and similar to previous successful batches of ice core, snow and associated blank samples, thus allowing a successful 10 Be measurement in the absence of any boron correction. Overall recovery of the BeO for this process averaged 40%. Extensive testing of relevant processing equipment and reagents failed to determine the source of the boron. As a precautionary measure, a similar H 2 SO 4 + HF step has been subsequently added to the standard ice processing method.Crown

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“…2 of [6]. This updated procedure is based on the methods for extraction of 10 Be from aqueous samples described by [15,16] and includes heating the sample with HF to drive off boron as BF 3 . We consider this a necessary precaution because 10 B is an isobar of 10 Be and can interfere with the AMS measurement; this was problematic for 05/06-pit samples [17].…”

Section: Sample Processing and Measurementmentioning

confidence: 99%