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Wang et al. Here we attempt to reproduce this event in tree rings of an absolutely dated bristlecone pine specimen Pinus longaeva from the White Mountains, USA and a subfossil oak Quercus sp.

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We cannot confirm the presence of a cosmic-ray event as suggested at — BCE and we discuss potential implications to earlier results. Carbon half-life years is produced by the reaction of secondary thermal neutrons derived from the primary cosmic-ray flux on nitrogen 9.

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This 14C is incorporated into the terrestrial carbon cycle within 1—2 years as is most convincingly demonstrated through the14C signal of anthropogenic nuclear testing Miyake et al. The CE event was first confirmed in a bristlecone pine record 4and indeed, this work encouraged many subsequent studies looking for both these events and searches for other events.

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Büntgen et al. Another rapid event at BCE has been reproduced in different records and is therefore widely accepted 712 Separately, other rapid changes that may show more complex solar dynamo phenomena or combinations of solar and galactic events at BCE and BCE have been observed 14 An important task in demonstrating a convincing global signature of a 14C excursion is to reproduce the event with tree rings from different geographic locations.

We endeavored to reproduce the 14C sequence of Wang et al. First, we measured 14C on tree rings of bristlecone pine from the White Mountains in California. This tree species is well known for a remarkably long öregedésgátló tulajdonságokkal rendelkező gyógynövények often exceeding several thousand years.

The SH remnant specimen was collected at the Sheep Mountain high-elevation site and rigorously cross-dated with the site master chronology spanning BCE— CE Second, we developed 14C tree-ring series from subfossil oak collected from a gravel pit near Champey-sur-Moselle. We obtained 14C measurements on tree rings from a bristlecone pine for the interval — BCE 42 years and from an oak for — BCE 41 years.

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These 14C series are developed from a year specimen of bristlecone pine — BCE and a year oak tree — BCEwhere the rings are absolutely dated via cross-dating with original site master chronologies. This experiment allows us to observe if the Wang et al. Figure 1 and Supplementary Table 1 present our results in a Δ14C plot 19 against known age of the tree rings.

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A year periodicity with an amplitude of ~5 per mil on a declining trend of Δ14C 18 has clearly appeared. We compared our series to those of Wang et al. Intriguingly, the Chinese wingnut 14C measurements agree with the general a 4 Swiss Valleys anti aging of our results, except for the 2 years of — BCE, where Wang et al.

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The excursion proposed by Wang et al. To confirm that the records are statistically different, we performed t test on each set of data. Because the Chinese wingnut specimen was dated with 14C wiggle-matching, we developed longer 14C series covering two decades prior to BCE where the calendar dates might shift due to wiggle-matching.

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Nevertheless, we do not observe any excursion consistent with Wang et al. In the case of the wingnut samples, the age reported by ref. The green squares show data from Debrecen, the blue circles data from ETH, and the red triangles show the results of Wang et al. The gray area shows the international calibration curve IntCal20 11 with 1σ error, which is based on a spline fit to the IntCal20 at 5-year resolution.

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Full size image Our results raise some important points regarding radiocarbon and dendrochronological dating.

However, the dating approach applied by Wang et al.

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The annual ring variations of bristlecone pine from the alpine environments are limited by the cold and extremely dry climate The pine growth is not comparable to Chinese wingnut, a 4 Swiss Valleys anti aging has a completely different ecological amplitude, different climatic controls, and grows ~10, km away. Besides, the wingnut specimen contained only ~60 rings.

Further, Wang et al. We believe that it is important for cross-dating to be carried out a 4 Swiss Valleys anti aging to well-established methods and practices The wingnut specimen was 14C dated prior to the spike study of high-resolution 14C measurements.