SCALING THE <sup>14</sup>C-EXCURSION SIGNAL IN MULTIPLE TREE-RING SERIES WITH DYNAMIC TIME WARPING

Panyushkina, Irina P.; Livina, Valerie N.; Molnár, Mihály; Varga, Tamás; Jull, A. J. T.

doi:10.1017/rdc.2022.25

Cited by 3 publications

(2 citation statements)

References 35 publications

(51 reference statements)

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“…Thus, multiple publications have reported an unusual 14 C increase around that age, but its origin has not yet been resolved. Panyushkina et al (2022) suggested that these different excursions may all relate to the same event, which is manifested differently in different records.…”

Section: Smaller Events: 1279 Ce 1052 Ce and 5410 Bcementioning

confidence: 99%

“…Rapid 14 C increases were confirmed in 7177/7176 BCE and 5260/5259 BCE in these datasets of three or four tree samples (note that only 14 C data of the Bristlecone pine for the 5259 BCE event depicts the increase one year earlier, i.e., in 5261/5260 BCE). This offset may be due to a dendrochronological miscount or inaccurate separation of annual rings, but Panyushkina et al (2022) have also emphasized the importance of cross-correlating different sequences and correcting for timing differences. For these two events, overall 14 C variations are similar to those of the 774 CE event, with the maximum 14 C increase reaching 19-20‰ in 14 C (deviation of 14 C concentration from a standard of modern value after corrections of age and isotopic fractionation), which is greater than that of the 774 CE event (≈18‰).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Extreme Solar Events: Setting up a Paradigm

Usoskin,

Miyake,

Baroni

et al. 2023

Space Sci Rev

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The Sun is magnetically active and often produces eruptive events on different energetic and temporal scales. Until recently, the upper limit of such events was unknown and believed to be roughly represented by direct instrumental observations. However, two types of extreme events were discovered recently: extreme solar energetic particle events on the multi-millennial time scale and super-flares on sun-like stars. Both discoveries imply that the Sun might rarely produce events, called extreme solar events (ESE), whose energy could be orders of magnitude greater than anything we have observed during recent decades. During the years following these discoveries, great progress has been achieved in collecting observational evidence, uncovering new events, making statistical analyses, and developing theoretical modelling. The ESE paradigm lives and is being developed. On the other hand, many outstanding questions still remain open and new ones emerge. Here we present an overview of the current state of the art and the forming paradigm of ESE from different points of view: solar physics, stellar–solar projections, cosmogenic-isotope data, modelling, historical data, as well as terrestrial, technological and societal effects of ESEs. Special focus is paid to open questions and further developments. This review is based on the joint work of the International Space Science Institute (ISSI) team #510 (2020–2022).

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Section: Smaller Events: 1279 Ce 1052 Ce and 5410 Bcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extreme Solar Events: Setting up a Paradigm

Usoskin,

Miyake,

Baroni

et al. 2023

Space Sci Rev

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Radiocarbon Dating of Highly Degraded and Problematic Fossil Wood: Verification of the Effectiveness of Various Preparation Methods

Jędrzejowski,

Michczyńska,

Kłusek

et al. 2024

Radiocarbon

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This paper compares various wood pretreatment methods for highly degraded, and problematic fossil wood extracted from the opencast Szczerców site of the Bełchatów Lignite Mine in Central Poland. The study evaluates the pretreatment methods using both large samples (55–255 g, referred to as series A) and small samples (36–150 mg, referred to as series B). Additionally, all preparation methods were applied to medium-sized samples (approximately 3 g, referred to as series C) with solvent washes in the Soxhlet apparatus. Radiocarbon dating was conducted using the LSC technique (subseries A1) and the AMS technique (subseries A2, series B, and C). The effectiveness and utility of each pretreatment protocol were compared based on 14C measurements and FTIR analysis. Through the conducted research and a multi-criteria analysis, the most effective method for preparing old fossil wood was identified. Our experience indicates that an extended, multistage preparation of highly degraded fossil wood samples, with a 14C concentration near the detection limit of the radiocarbon method, may result in a significant increase in 14C content.

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Miyake events: a review of the state-of-the-art

Hantemirov

2024

Forestry Engineering Journal

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Miyake events are fast and significant radiocarbon rises in the Earth's atmosphere. Japanese researchers from Nagoya University discovered this kind of event based on radiocarbon analysis in tree rings. They found a spike in the radioactive carbon isotope in the ring of 775AD compared to the 774AD ring. Subsequently, all such events became known by the name of the first author of the seminal paper. To date, five Miyake events have been discovered: around 12350 BC, in 7176 and 5259 BC, in 775 and 993 AD. The events of 5410 BC, 1052 and 1279 AD are less pronounced and require confirmation. Among the possible reasons for the sharp increase in the content of radiocarbon in the atmosphere a comet falling to the Earth or to the Sun, a short gamma-ray burst, a supernova outbreak were suggested. The most likely version, however, is considered to be solar energetic particles as a result of a super-powerful solar flare. Such solar events should lead to auroras in low latitudes. However, in the annals of Europe, the Middle East and the Far East, no reliable records of auroras in the years of Miyake events have been found. Nowadays, Miyake events are used in many fields of science, for example, to check the reliability of dendrochronological dating, for accurate dating of ice core layers. The most important, however, is considered to be the possibility of radiocarbon dating with an accuracy of one year.

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SCALING THE ¹⁴C-EXCURSION SIGNAL IN MULTIPLE TREE-RING SERIES WITH DYNAMIC TIME WARPING

Cited by 3 publications

References 35 publications

Extreme Solar Events: Setting up a Paradigm

Extreme Solar Events: Setting up a Paradigm

Radiocarbon Dating of Highly Degraded and Problematic Fossil Wood: Verification of the Effectiveness of Various Preparation Methods

Miyake events: a review of the state-of-the-art

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SCALING THE 14C-EXCURSION SIGNAL IN MULTIPLE TREE-RING SERIES WITH DYNAMIC TIME WARPING

Cited by 3 publications

References 35 publications

Extreme Solar Events: Setting up a Paradigm

Extreme Solar Events: Setting up a Paradigm

Radiocarbon Dating of Highly Degraded and Problematic Fossil Wood: Verification of the Effectiveness of Various Preparation Methods

Miyake events: a review of the state-of-the-art

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SCALING THE ¹⁴C-EXCURSION SIGNAL IN MULTIPLE TREE-RING SERIES WITH DYNAMIC TIME WARPING