Smoking guns and volcanic ash: the importance of sparse tephras in Greenland ice cores

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F20%3A00525290" target="_blank" >RIV/86652079:_____/20:00525290 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/20:00116702

Result on the web

<a href="https://polarresearch.net/index.php/polar/article/view/3511/11020" target="_blank" >https://polarresearch.net/index.php/polar/article/view/3511/11020</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.33265/polar.v39.3511" target="_blank" >10.33265/polar.v39.3511</a>

Result language

angličtina

Original language name

Smoking guns and volcanic ash: the importance of sparse tephras in Greenland ice cores

Original language description

Volcanic ash (fine-grained tephra) within Greenland ice cores can complement the understanding of past volcanism and its environmental and societal impacts. The presence of ash in sparse concentrations in the ice raises questions about whether such material represents primary ashfall in Greenland or resuspended (remobilized) material from continental areas. In this article, we investigate this issue by examining tephra content in quasi-annual samples from two Greenland ice cores during a period of ca. 20 years and considering their relationships with sulphur and particulate data from the same cores. We focus on the interval 815-835 CE as it encompasses a phase (818-822 CE) of heightened volcanogenic sulphur previously ascribed to an eruption of Katla, Iceland. We find that tephra is a frequent but not continuous feature within the ice, unlike similarly sized particulate matter. A solitary ash shard whose major element geochemistry is consistent with Katla corroborates the attribution of the 822 +/- 1 CE sulphur peak to this source, clearly showing that a single shard can signify primary ashfall. Other tephras are present in similarly low abundances, but their geochemistries are less certainly attributable to specific sources. Although these tephra shards tend to coincide with elevated sulphur and fine (<10 mu m) particulates, they are not associated with increased coarse (>10 mu m) particle concentrations that might be expected if the shards had been transported by dust storms. We conclude that the sparse shards derive from primary ashfall, and we argue that low tephra concentrations should not be dismissed as insignificant.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10502 - Oceanography

Project

<a href="/en/project/EF16_019%2F0000797" target="_blank" >EF16_019/0000797: SustES - Adaptation strategies for sustainable ecosystem services and food security under adverse environmental conditions</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Polar Research

ISSN

0800-0395

e-ISSN

—

Volume of the periodical

39

Issue of the periodical within the volume

JUN

Country of publishing house

NO - NORWAY

Number of pages

11

Pages from-to

3511

UT code for WoS article

000539032900001

EID of the result in the Scopus database

2-s2.0-85088263274