info:eu-repo/semantics/article
Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE
Fecha
2018-09Registro en:
Büntgen, Ulf; Wacker, Lukas; Galván, J. Diego; Arnold, Stephanie; Arseneault, Dominique; et al.; Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE; Nature Publishing Group; Nature Communications; 9; 1; 9-2018; 1-7
2041-1723
CONICET Digital
CONICET
Autor
Büntgen, Ulf
Wacker, Lukas
Galván, J. Diego
Arnold, Stephanie
Arseneault, Dominique
Baillie, Michael
Beer, Jürg
Bernabei, Mauro
Bleicher, Niels
Boswijk, Gretel
Bräuning, Achim
Carrer, Marco
Ljungqvist, Fredrik Charpentier
Cherubini, Paolo
Christl, Marcus
Christie, Duncan A.
Clark, Peter W.
Cook, Edward R.
D'Arrigo, Rosanne
Davi, Nicole
Eggertsson, Ólafur
Esper, Jan
Fowler, Anthony M.
Gedalof, Ze'ev
Gennaretti, Fabio
Grießinger, Jussi
Grissino Mayer, Henri
Grudd, Håkan
Gunnarson, Björn E.
Hantemirov, Rashit
Herzig, Franz
Hessl, Amy
Heussner, Karl-Uwe
Jull, A. J. Timothy
Kukarskih, Vladimir
Kirdyanov, Alexander
Kolár, Tomás
Krusic, Paul J.
Kyncl, Tomás
Lara, Antonio
LeQuesne, Carlos
Linderholm, Hans W.
Loader, Neil J.
Luckman, Brian
Miyake, Fusa
Myglan, Vladimir S.
Nicolussi, Kurt
Oppenheimer, Clive
Palmer, Jonathan
Panyushkina, Irina
Pederson, Neil
Rybnícek, Michal
Schweingruber, Fritz H.
Seim, Andrea
Sigl, Michael
Churakova, Olga
Speer, James H.
Synal, Hans-Arno
Tegel, Willy
Treydte, Kerstin
Villalba, Ricardo
Wiles, Greg
Wilson, Rob
Winship, Lawrence J.
Wunder, Jan
Yang, Bao
Young, Giles H. F.
Resumen
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.