Modeling production and climate‐related impacts on <sup>10</sup>Be concentration in ice cores

Field, Christy V.; Schmidt, Gavin A.; Koch, D.; Salyk, Colette

doi:10.1029/2005jd006410

Cited by 160 publications

(162 citation statements)

References 65 publications

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“…10 Be is a spallation product of galactic cosmic rays hitting atmospheric O, N and Ar atoms; 14 C is produced by thermal neutrons, generated by cosmic rays, interacting with N. About two-thirds of the 10 Be are formed in the stratosphere and about one-third in the troposphere from where precipitation times into the reservoirs are typically 1 year and 1 week, respectively. The deposition into any one reservoir is influenced, to some extent, by climate conditions (e.g., Vonmoos et al 2006;Field et al 2006;Aldahan et al 2008;Heikkila et al 2008). On the other hand, the 14 C generated by GCRs takes part in the carbon cycle and is exchanged with the two major reservoirs, the oceans and the biomass.…”

Section: Paleoclimate Studies and Solar Proxiesmentioning

confidence: 99%

Solar Influence on Global and Regional Climates

Lockwood

2012

Surv Geophys

145

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The literature relevant to how solar variability influences climate is vast-but much has been based on inadequate statistics and non-robust procedures. The common pitfalls are outlined in this review. The best estimates of the solar influence on the global mean air surface temperature show relatively small effects, compared with the response to anthropogenic changes (and broadly in line with their respective radiative forcings). However, the situation is more interesting when one looks at regional and season variations around the global means. In particular, recent research indicates that winters in Eurasia may have some dependence on the Sun, with more cold winters occurring when the solar activity is low. Advances in modelling ''top-down'' mechanisms, whereby stratospheric changes influence the underlying troposphere, offer promising explanations of the observed phenomena. In contrast, the suggested modulation of low-altitude clouds by galactic cosmic rays provides an increasingly inadequate explanation of observations.

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Section: Paleoclimate Studies and Solar Proxiesmentioning

confidence: 99%

Solar Influence on Global and Regional Climates

Lockwood

2012

Surv Geophys

145

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“…As already pointed out, 14 C and 10 Be respond differently to climate changes. In particular, 14 C is mostly affected by the ocean ventilation and mixing, while 10 Be (in particular its deposition on central Greenland) is mainly affected by the large-scale atmospheric circulation, particularily in the North Atlantic region (Field et al 2006;Heikkilä et al 2009). It can also hardly be of geomagnetic origin and related to geomagnetic pole migration, since 14 C is globally (hemispherically) mixed in the terrestrial system and insensitive to the migration of these poles.…”

Section: Common Signature Of the Hallstatt Cyclementioning

confidence: 99%

Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxima

Usoskin

Gallet

Lopes

et al. 2016

A&A

124

183

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Aims. Cosmogenic isotopes provide the only quantitative proxy for analyzing the long-term solar variability over a centennial timescale. While essential progress has been achieved in both measurements and modeling of the cosmogenic proxy, uncertainties still remain in the determination of the geomagnetic dipole moment evolution. Here we aim at improving the reconstruction of solar activity over the past nine millennia using a multi-proxy approach. Methods. We used records of the 14 C and 10 Be cosmogenic isotopes, current numerical models of the isotope production and transport in Earth's atmosphere, and available geomagnetic field reconstructions, including a new reconstruction relying on an updated archeo-and paleointensity database. The obtained series were analyzed using the singular spectrum analysis (SSA) method to study the millennial-scale trends. Results. A new reconstruction of the geomagnetic dipole field moment, referred to as GMAG.9k, is built for the last nine millennia. New reconstructions of solar activity covering the last nine millennia, quantified in terms of sunspot numbers, are presented and analyzed. A conservative list of grand minima and maxima is also provided. Conclusions. The primary components of the reconstructed solar activity, as determined using the SSA method, are different for the series that are based on 14 C and 10 Be. This shows that these primary components can only be ascribed to long-term changes in the terrestrial system and not to the Sun. These components have therefore been removed from the reconstructed series. In contrast, the secondary SSA components of the reconstructed solar activity are found to be dominated by a common ≈2400-year quasi-periodicity, the so-called Hallstatt cycle, in both the 14 C and 10 Be based series. This Hallstatt cycle thus appears to be related to solar activity. Finally, we show that the grand minima and maxima occurred intermittently over the studied period, with clustering near lows and highs of the Hallstatt cycle, respectively.

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“…The sole source of meteoric 10 Be to the weathering zone is atmospheric fallout, through both wet or dry deposition (Monaghan et al, 1985/86;Field et al, 2006;Heikkilä et al, 2008) (Fig. 1).…”

Section: 1mentioning

confidence: 99%

Earth surface erosion and weathering from the 10Be (meteoric)/9Be ratio

Blanckenburg

Bouchez

Wittmann

2012

Earth and Planetary Science Letters

142

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: Earth surface erosion and weathering from the 10Be (meteoric)/9Be ratio. v351-352, pp 295-305 2012, doi j/epsl.2012.07.022 AbstractThe isotope ratio of the meteoric cosmogenic nuclide 10 Be to the mineral-derived stable isotope 9 Be discloses both the Earth surfaces' denudation rate and its weathering intensity. We develop a set of steady state mass balance equations that describes this system from a soil column over the hillslope scale to an entire river basin. The prerequisites making this new approach possible are: 1) the 9 Be concentration of parent rock (typically 2.5 ± 0.5 ppm in granitic and clastic sedimentary lithologies) is known; 2) both Be isotopes equilibrate between the fluids decomposing rock and reactive solids formed during weathering; and 3) a critical spatial scale is exceeded at which the fluxes of both isotopes into and out of the weathering zone are at steady state over the time scale of weathering (typically ~10 kyr). For these cases the isotope ratios can be determined in bulk sediment or soil, on leachates from the reactive (adsorbed and pedogenic mineral-bound) phase in sediment or soil, and even on the dissolved phase in river water. The 10 Be/ 9Be ratio offers substantial advantages over the single-isotope system of meteoric 10 Be. The latter system allows to directly determine erosion rates only in the case that 10 Be is fully retentive in the weathering zone and that riverine sorting has not introduced grain size-dependent 10 Be concentration gradients in sediments. We show the feasibility of the 10 Be/ 9 Be tracer approach at the river scale for sediment and water samples in the Amazon basin, where independent estimates of denudation rates from in situ-produced 10 Be exist. We furthermore calculate meaningful denudation rates from a set of published 10 Be/ 9 Be ratios measured in the dissolved load of globally distributed rivers. We conclude that this isotope ratio can be used to reconstruct global paleodenudation from sedimentary records.

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Modeling production and climate‐related impacts on ¹⁰Be concentration in ice cores

Cited by 160 publications

References 65 publications

Solar Influence on Global and Regional Climates

Solar Influence on Global and Regional Climates

Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxima

Earth surface erosion and weathering from the 10Be (meteoric)/9Be ratio

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Modeling production and climate‐related impacts on 10Be concentration in ice cores

Cited by 160 publications

References 65 publications

Solar Influence on Global and Regional Climates

Solar Influence on Global and Regional Climates

Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxima

Earth surface erosion and weathering from the 10Be (meteoric)/9Be ratio

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Product

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Modeling production and climate‐related impacts on ¹⁰Be concentration in ice cores