Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE.
Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE.
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树环揭示了774和993 CE中宇宙源性放射性碳事件的全球相干特征。
DOI：
10.1038/s41467-018-06036-0
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发表时间：
2018-09-06
影响因子：
16.6
通讯作者：
Young GHF
中科院分区：
文献类型：
--
作者：
Büntgen U;Wacker L;Galván JD;Arnold S;Arseneault D;Baillie M;Beer J;Bernabei M;Bleicher N;Boswijk G;Bräuning A;Carrer M;Ljungqvist FC;Cherubini P;Christl M;Christie DA;Clark PW;Cook ER;D'Arrigo R;Davi N;Eggertsson Ó;Esper J;Fowler AM;Gedalof Z;Gennaretti F;Grießinger J;Grissino-Mayer H;Grudd H;Gunnarson BE;Hantemirov R;Herzig F;Hessl A;Heussner KU;Jull AJT;Kukarskih V;Kirdyanov A;Kolář T;Krusic PJ;Kyncl T;Lara A;LeQuesne C;Linderholm HW;Loader NJ;Luckman B;Miyake F;Myglan VS;Nicolussi K;Oppenheimer C;Palmer J;Panyushkina I;Pederson N;Rybníček M;Schweingruber FH;Seim A;Sigl M;Churakova Sidorova O;Speer JH;Synal HA;Tegel W;Treydte K;Villalba R;Wiles G;Wilson R;Winship LJ;Wunder J;Yang B;Young GHF
虽然树木年轮年表每年都会被解析，但它们的年代从未在全球范围内得到独立验证。此外，尚不清楚宇宙起源的大气放射性碳富集事件是否留下时空一致的指纹。在这里，我们测量了在770-780和990-1000 CE时期形成的484个单独的树木年轮中的14 C含量。从774年的北方夏季和993年的北方春季开始的独特的14 C漂移确保了来自五大洲的44个树木年轮记录的精确定年。我们还确定了11年平均大气放射性碳浓度在两个半球的纬向下降。我们的研究结果得到了历史上红色极光目击者的证实，表明全球都暴露在强烈的太阳质子辐射下。为了更好地了解过去宇宙事件的返回频率和强度，这对评估空间天气对我们社会的潜在威胁特别重要，需要进一步进行年度14 C测量。尽管它们被广泛使用，但树木年轮年表的绝对定年迄今尚未在全球范围内得到独立验证。在这里，484个树木年轮中不同的14 C偏移的识别，使作者能够确认来自五大洲的44个树木年代学的年代。
Though tree-ring chronologies are annually resolved, their dating has never been independently validated at the global scale. Moreover, it is unknown if atmospheric radiocarbon enrichment events of cosmogenic origin leave spatiotemporally consistent fingerprints. Here we measure the 14C content in 484 individual tree rings formed in the periods 770–780 and 990–1000 CE. Distinct 14C excursions starting in the boreal summer of 774 and the boreal spring of 993 ensure the precise dating of 44 tree-ring records from five continents. We also identify a meridional decline of 11-year mean atmospheric radiocarbon concentrations across both hemispheres. Corroborated by historical eye-witness accounts of red auroras, our results suggest a global exposure to strong solar proton radiation. To improve understanding of the return frequency and intensity of past cosmic events, which is particularly important for assessing the potential threat of space weather on our society, further annually resolved 14C measurements are needed. Despite their extensive use, the absolute dating of tree-ring chronologies has not hitherto been independently validated at the global scale. Here, the identification of distinct 14C excursions in 484 individual tree rings, enable the authors to confirm the dating of 44 dendrochronologies from five continents.
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影响因子：
3.9
作者：
Li, M. -H.;Cherubini, P.;Rigling, A.
通讯作者：
Rigling, A.
影响因子：
8.3
作者：
Adolphi, F.;Guettler, D.;Muscheler, R.
通讯作者：
Muscheler, R.
影响因子：
5.2
作者：
BRAZIUNAS, TF;FUNG, IY;STUIVER, M
通讯作者：
STUIVER, M
影响因子：
4.4
作者：
Appenzeller, C;Holton, JR;Rosenlof, KH
通讯作者：
Rosenlof, KH
影响因子：
16.6
作者：
Miyake, Fusa;Masuda, Kimiaki;Nakamura, Toshio
通讯作者：
Nakamura, Toshio