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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216224:14310/20:00116702

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10502 - Oceanography

Projekt

<a href="/cs/project/EF16_019%2F0000797" target="_blank" >EF16_019/0000797: SustES - Adaptační strategie pro udržitelnost ekosystémových služeb a potravinové bezpečnosti v nepříznivých přírodních podmínkách</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Polar Research

ISSN

0800-0395

e-ISSN

—

Svazek periodika

39

Číslo periodika v rámci svazku

JUN

Stát vydavatele periodika

NO - Norské království

Počet stran výsledku

11

Strana od-do

3511

Kód UT WoS článku

000539032900001

EID výsledku v databázi Scopus

2-s2.0-85088263274