Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00113257" target="_blank" >RIV/00216224:14310/18:00113257 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/86652079:_____/18:00495446 RIV/62156489:43410/18:43913957

Výsledek na webu

<a href="https://www.nature.com/articles/s41467-018-06036-0" target="_blank" >https://www.nature.com/articles/s41467-018-06036-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41467-018-06036-0" target="_blank" >10.1038/s41467-018-06036-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE

Popis výsledku v původním jazyce

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 C-14 content in 484 individual tree rings formed in the periods 770-780 and 990-1000 CE. Distinct C-14 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 C-14 measurements are needed.

Název v anglickém jazyce

Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE

Popis výsledku anglicky

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 C-14 content in 484 individual tree rings formed in the periods 770-780 and 990-1000 CE. Distinct C-14 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 C-14 measurements are needed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nature Communications

ISSN

2041-1723

e-ISSN

—

Svazek periodika

9

Číslo periodika v rámci svazku

SEP 6 2018

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

1-7

Kód UT WoS článku

000443797400006

EID výsledku v databázi Scopus

2-s2.0-85052992362