Volcanic and solar activity, and atmospheric circulation influences on cosmogenic 10Be fallout at Vostok and Concordia (Antarctica) over the last 60years

Baroni, Mélanie; Bard, Édouard; Petit, Jean‐Robert; Magand, Olivier; Bourlès, Didier

doi:10.1016/j.gca.2011.09.002

Cited by 71 publications

(105 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1C and 2). Indeed, variations in 10 Be concentration at Vostok were shown to result from the combined influences of 10 Be production, modulated by solar activity; modulation of tropospheric air mass transportation (linked to SAM and ACW); and stratospheric input (23). Because of these numerous influences on 10 Be, we do not expect a perfect correlation between 10 Be and 17 O-excess.…”

Section: Methodsmentioning

confidence: 92%

“…9, followed by isotope ratio mass spectrometry using a Delta V mass spectrometer from ThermoFisher. The overall uncertainty for the The gross β-radioactivity indicated the maximum fallout of the nuclear bomb tests, with their imprints in the snow in January 1955 ±1.5 y and January 1965 ±1.5 y, respectively (23). Because of the intermittency of the precipitation and the snow remobilization, the uncertainty of the absolute chronology may increase up to several years between reference horizons.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Interannual variation of water isotopologues at Vostok indicates a contribution from stratospheric water vapor

Winkler

Landais

Risi

et al. 2013

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

View full text Add to dashboard Cite

Combined measurements of water isotopologues of a snow pit at Vostok over the past 60 y reveal a unique signature that cannot be explained only by climatic features as usually done. Comparisons of the data using a general circulation model and a simpler isotopic distillation model reveal a stratospheric signature in the 17 O-excess record at Vostok. Our data and theoretical considerations indicate that mass-independent fractionation imprints the isotopic signature of stratospheric water vapor, which may allow for a distinction between stratospheric and tropospheric influences at remote East Antarctic sites.S table water isotopic ratios (δ 18 O and δ 2 H) have been used for many years as a proxy for local temperature T s reconstruction in East Antarctica (1, 2). The link with temperature results from mass-dependent isotopic fractionation of water at each phase transition along the water mass trajectory from the evaporative zone to the polar precipitation site. Two different kinds of massdependent fractionation effects lead to the depletion in heavy isotopologues of the water vapor. First, equilibrium fractionation is caused by the lower vapor pressure for the heavy isotopologues compared with the one for the abundant light (H 2 O) water molecules. Second, kinetic fractionation leads to isotopic fractionation due to different molecular diffusivity constants of the light and heavy water isotopologues (light molecules diffuse faster in air than the heavy ones) (3). The observed spatial slope of Δδ 18 O vs. ΔT s lies between 0.75‰ and 0.8‰°C −1 [±20% at glacial timescales (4-6)] and builds the basis for past temperature reconstruction from δ 18 O in ice cores. It should be noted that this relationship can be associated with larger uncertainties of factor 2 for warmer than present-day climates (7). Biases to a constant temporal δ 18 O vs. temperature slope may arise from changes of moisture origin for the polar precipitation, precipitation intermittency at the seasonal or interannual scale, postdeposition effects, and changes of moisture trajectories. Tools exist to quantify such biases. First, the second-order parameters deuterium (d)-excess (8) ·y −1 water equivalent). In addition, Vostok is located within the Antarctic vortex, which makes it sensitive to stratospheric input (up to 5%) (12). Only onequarter of the precipitation originates from tropospheric snowfall, whereas 75% is due to hoar frost deposition and ice needle fallout (diamond dust), which may originate from the stratosphere (13,14). The influence of such stratospheric water vapor input has been only marginally investigated even if the existence of mass independent fractionation (MIF) in the stratosphere is expected to strongly affect 17 O-excess (15). This is because other effects become also prominent in these regions. First, at the observed very low temperature range (<−50°C), the secondorder parameters d-excess and 17 O-excess are expected to show strong variations with condensation temperature (16). Second, the interpretation of water isotopic pr...

show abstract

Section: Methodsmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Interannual variation of water isotopologues at Vostok indicates a contribution from stratospheric water vapor

Winkler

Landais

Risi

et al. 2013

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

View full text Add to dashboard Cite

show abstract

“…Hence, it is not straightforward to disentangle the different origins of beryllium variability in the surface, as already shown by numerous studies based on surface measurements (e.g. Baroni et al, 2011).…”

Section: Summary and Concluding Remarksmentioning

confidence: 98%

Modelling the stratospheric budget of beryllium isotopes

Delaygue¹,

Bekki²,

Bard

2015

Tellus B: Chemical and Physical Meteorology

Self Cite

View full text Add to dashboard Cite

A B S T R A C TA global 2-D (latitudeÁaltitude) model describing both the stratospheric circulation and the detailed formation and growth of stratospheric aerosols is used to simulate the stratospheric cycle of cosmogenic isotopes of beryllium, Be-7 and Be-10. These isotopes have been extensively used as tracers of stratospheric air, as well as of solar variability. The simulation of these isotopes is used to quantify the relative importance of transport, microphysic processes related to aerosols, and radioactive decay, on their concentrations. Calculations of model budget show that the vertical transfer of these isotopes due to the aerosol sedimentation contributes to about half of the stratospheric Be-10 flux into the troposphere, but is negligible for the Be-7 budget. The simulated residence time of these isotopes in the lower stratosphere is monotonically related to the age of air; however, this relationship is neither linear nor uniform, which biases the age of air inferred from these isotopes.

show abstract

“…For example, it has been suggested that volcanic aerosols influence the scavenging of 10 Be, i.e. leading to enhanced 10 Be deposition following such events (Baroni et al, 2011). However, our knowledge about such effects and their influences on 10 Be records is limited.…”

Section: Be Datamentioning

confidence: 99%

The Revised Sunspot Record in Comparison to Cosmogenic Radionuclide-Based Solar Activity Reconstructions

et al. 2016

View full text Add to dashboard Cite

Recent revisions in the sunspot records illustrate the challenges related to obtaining a 400-year-long observational record of past solar-activity changes. Cosmogenic radionuclides offer the possibility of obtaining an alternative and completely independent record of solar variability. Here, we illustrate that these records offer great potential for quantitative solar-activity reconstructions far back into the past, and we provide updated radionuclide-based solar-activity reconstructions for the past 2000 years. However, cosmogenic-radionuclide records are also influenced by processes independent of solar activity, leading to the need for critical assessment and correction for the non-solar influences. Independent of these uncertainties, we show a very good agreement between the revised sunspot records and the 10 Be records from Antarctica and, in particular, the 14 C-based solar-activity reconstructions. This comparison offers the potential of identifying remaining non-solar processes in the radionuclide-based solar-activity reconstructions, but it also helps identifying remaining biases in the recently revised sunspot records.

show abstract

Volcanic and solar activity, and atmospheric circulation influences on cosmogenic 10Be fallout at Vostok and Concordia (Antarctica) over the last 60years

Cited by 71 publications

References 79 publications

Interannual variation of water isotopologues at Vostok indicates a contribution from stratospheric water vapor

Interannual variation of water isotopologues at Vostok indicates a contribution from stratospheric water vapor

Modelling the stratospheric budget of beryllium isotopes

The Revised Sunspot Record in Comparison to Cosmogenic Radionuclide-Based Solar Activity Reconstructions

Contact Info

Product

Resources

About