Information on past solar activity and geomagnetism from 10Be in the Camp Century ice core

Beer, J.; Siegenthaler, U.; Bonani, Georges; Finkel, Robert C.; Oeschger, H.; Suter, M.; Wölfli, W.

doi:10.1038/331675a0

Cited by 212 publications

(88 citation statements)

References 29 publications

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“…The observed records of the SSN periodicities from growth rings of trees from places with different climates, from satellites and 10 Be concentration in polar ice show regular mean cycles near 6, 11, 22, 52 and 90 years in different time scales [2,19,20,24,33,38,46,47,51,52,63]. These fluctuations are present in centurial and decadal time scales [36].…”

Section: Introductionmentioning

confidence: 93%

Impact de l’activité solaire, anomalie globale de température de l’air et oscillation décadaire pacifique sur les cernes d’arbres en milieu urbain

Chen

et al. 2007

Ann. For. Sci.

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-A tree ring width chronology developed from 58 samples taken from Chinese pine trees (Pinus tabulaeformis Carr.) growing in Shenyang city was studied to analyze the effects of solar activity, Global Surface Air Temperature Anomalies (GSATA) and the Pacific Decadal Oscillation (PDO) on annual radial growth. An excellent response of tree rings to solar activity and global environmental change was revealed, indicating that these urban Chinese pine trees are a suitable proxy for Sun-Earth system research despite their location in Shenyang, an industrial city. The information derived from annual growth rings of urban Chinese pine trees coincides with records from undisturbed trees in a natural location, and demonstrates significant synchronous response to solar activity in the periodic bands of 5-8, 10-12 and 20-30 years. The wave signal of tree growth was also affected and amplified by the combined effect of the PDO from 1900 to 2004 and GSATA from 1880 to 2004 with a short lag time, revealing 5-8, 11-13, and 20-23 year oscillatory modes. At 20-30 year timescale, Chinese pines validated the strong GSATA influence signal at 20.8 years, and may be the primary cause of the 20 and 23 year periodic waves of tree rings. Shenyang urban tree ring growth also showed high frequency variation (2-4 y) that may be due to low periodicity of solar activity, GSATA, PDO and local climate variations, especially in the 2-4 years band width.urban tree rings / sunspot number / Pacific decadal oscillation / global surface air temperature anomaly / wavelet analysis

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Section: Introductionmentioning

confidence: 93%

Impact de l’activité solaire, anomalie globale de température de l’air et oscillation décadaire pacifique sur les cernes d’arbres en milieu urbain

Chen

et al. 2007

Ann. For. Sci.

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“…10Be measurements on ice cores by Beer et al (1988) suggested that a 20% higher 14C production rate for the last 10-15 kyr of the glacial than for the Holocene could be the reason for the long-term Q14C trend of the Holocene. To confirm this proposition, much higher Q14C values at the end of the glacial would be required than allowed by our study.…”

Section: Preborealmentioning

confidence: 99%

Atmospheric Radiocarbon at the End of the Last Glacial: An Estimate Based on AMS Radiocarbon Dates on Terrestrial Macrofossils From Lake Sediments

Zbinden¹,

Andree²,

Oeschger³

et al. 1989

Radiocarbon

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ABSTRACT. The main purpose of this work is to reconstruct the atmospheric i14C in the glacial-postglacial transition, 14,000 -10,000 BP, a range not covered by the tree-ring calibration curve. We measured '4C/12C ratios on series of terrestrial macrofossils from sediments of two Swiss lakes. We selected exclusively plant remains of recognizable terrestrial origin that are not affected by hard water and thus reflect atmospheric 14C concentration. Due to the scarcity of such material, we used accelerator mass spectroscopy. Cores of two lakes were measured to eliminate local effects and to check the reproducibility of results. This required a reliable, 14C-independent correlation of the cores, obtained through local pollen zone boundaries.14C ages were obtained as a function of the depth in the cores. If sedimentation rates are known, ages can be converted into i14C values. We also attempted estimating sedimentation rates; calculations are based on the Swedish varve chronology. Results were combined to form an entire data set. The Q14C curve shows an increase with time during the Allermd and decreases during Preboreal and Bdlling periods. Probabilities for these 14C variations are discussed.

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“…They have been obtained from different cores with different resolutions, and include data from Milcent, Greenland (Beer et al 1983); Camp Century, Greenland (Beer et al 1988); Dye 3, Greenland (Beer et al 1990); Dome Concordia and South Pole, Antarctica (Raisbeck et al 1990); GRIP, Greenland ); GISP2, Greenland (Finkel and Nishiizumi 1997); Dome Fuji, Antarctica (Horiuchi et al 2007(Horiuchi et al , 2008Miyake et al 2015); Dronning Maud Land, Antarctica (Ruth et al 2007); NGRIP (North Greenland Ice Core Project), Greenland (Berggren et al 2009); NEEM (North Greenland Eemian Ice Drilling), Greenland ; West Antarctic Ice Sheet Divide Ice Core (WAIS/WDC), Antarctica , etc.…”

Section: Measurementsmentioning

confidence: 99%

A history of solar activity over millennia

Usoskin

2017

Living Rev Sol Phys

383

241

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Presented here is a review of present knowledge of the long-term behavior of solar activity on a multi-millennial timescale, as reconstructed using the indirect proxy method. The concept of solar activity is discussed along with an overview of the special indices used to quantify different aspects of variable solar activity, with special emphasis upon sunspot number. Over long timescales, quantitative information about past solar activity can only be obtained using a method based upon indirect proxies, such as the cosmogenic isotopes 14 C and 10 Be in natural stratified archives (e.g., tree rings or ice cores). We give an historical overview of the development of the proxy-based method for past solar-activity reconstruction over millennia, as well as a description of the modern state. Special attention is paid to the verification and cross-calibration of reconstructions. It is argued that this method of cosmogenic isotopes makes a solid basis for studies of solar variability in the past on a long timescale (centuries to millennia) during the Holocene. A separate section is devoted to reconstructions of strong solar energetic-particle (SEP) events in the past, that suggest that the present-day average SEP flux is broadly consistent with estimates on longer timescales, and that the occurrence of extra-strong events is unlikely. Finally, the main features of the long-term evolution of solar magnetic activity, including the

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Information on past solar activity and geomagnetism from 10Be in the Camp Century ice core

Cited by 212 publications

References 29 publications

Impact de l’activité solaire, anomalie globale de température de l’air et oscillation décadaire pacifique sur les cernes d’arbres en milieu urbain

Impact de l’activité solaire, anomalie globale de température de l’air et oscillation décadaire pacifique sur les cernes d’arbres en milieu urbain

Atmospheric Radiocarbon at the End of the Last Glacial: An Estimate Based on AMS Radiocarbon Dates on Terrestrial Macrofossils From Lake Sediments

A history of solar activity over millennia

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