The Late Holocene deglaciation of James Ross Island, Antarctic Peninsula: OSL and 14C-dated multi-proxy sedimentary record from Monolith Lake

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985939%3A_____%2F24%3A00586951" target="_blank" >RIV/67985939:_____/24:00586951 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/24:00136539 RIV/00216208:11310/24:10483977 RIV/60076658:12310/24:43908556 RIV/00025798:_____/24:10169294

Result on the web

<a href="https://doi.org/10.1016/j.quascirev.2024.108693" target="_blank" >https://doi.org/10.1016/j.quascirev.2024.108693</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.quascirev.2024.108693" target="_blank" >10.1016/j.quascirev.2024.108693</a>

Result language

angličtina

Original language name

The Late Holocene deglaciation of James Ross Island, Antarctic Peninsula: OSL and 14C-dated multi-proxy sedimentary record from Monolith Lake

Original language description

Lentic waterbodies provide terrestrial sedimentary archives of palaeoenvironmental change in deglaciated areas of the Antarctic. Knowledge of the long-term evolution of Antarctic palaeoenvironments affords important context to the current marked impacts of climate change in the Polar regions. Here, we present a comprehensively dated, multi-proxy sedimentary record from Monolith Lake, a distal proglacial lake in one of the largest ice-free areas of the Antarctic Peninsula region. Of the two defined sedimentary units in the cores studied, the lower Unit 1 exhibits a homogeneous composition and unvarying proxy data profiles, suggesting rapid clastic deposition under uniform, ice-proximal conditions with a sedimentation rate of1 mm yr(-1). C-14 and optically stimulated luminescence (OSL) dating bracket the deposition interval to 1.5-2.5 ka BP, with the older age being more probable when compared to independent dating of the local deglaciation. The uppermost 11 cm of the record spans the last2.2 ka BP (maximum age), suggesting a markedly decreased sedimentation rate of0.05 mm yr(-1) within Unit 2. Whereas Unit 1 shows only scarce evidence of biological activity, Unit 2 provides an uninterrupted record of diatoms (with 29 species recorded) and faunal subfossils, including the fairy shrimp Branchinecta gaini. Concentrations of organically-derived elements, as well as diatoms and faunal remains, are consistent, implying a gradual increase in lake productivity. These results provide an example of long-term Antarctic 'greening' (i.e. increasing organic productivity in terrestrial habitats) from a palaeolimnological perspective. The boundary between Units 1 and 2, therefore, marks the timing of local deglaciation at the final stages of a period of negative glacier mass balance, i.e. the Mid-Late Holocene Hypsithermal. Subsequent Neoglacial cooling is evidenced by the abated influence of glacial meltwater streams and turbidity decline linked to reduced glacier runoff, although most proxy responses mirror the natural proglacial lake ontogeny.

Czech name

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Czech description

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Type

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

CEP classification

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OECD FORD branch

10619 - Biodiversity conservation

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Quaternary Science Reviews

ISSN

0277-3791

e-ISSN

1873-457X

Volume of the periodical

333

Issue of the periodical within the volume

JUN 1 2024

Country of publishing house

GB - UNITED KINGDOM

Number of pages

17

Pages from-to

108693

UT code for WoS article

001239859800001

EID of the result in the Scopus database

2-s2.0-85192326995