J 2024

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

ROMAN, Matěj, Anna PÍŠKOVÁ, David C.W. SANDERSON, Alan J CRESSWELL, Marie BULÍNOVÁ et. al.

Basic information

Original name

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

Authors

ROMAN, Matěj (203 Czech Republic, belonging to the institution), Anna PÍŠKOVÁ, David C.W. SANDERSON, Alan J CRESSWELL, Marie BULÍNOVÁ, Matěj POKORNÝ, Jan KAVAN (203 Czech Republic, belonging to the institution), Stephen James Arthur JENNINGS (826 United Kingdom of Great Britain and Northern Ireland, belonging to the institution), Juan M. LIRIO, Linda NEDBALOVÁ, Veronika SACHEROVÁ, Kateřina KOPALOVÁ, Neil F. GLASSER and Daniel NÝVLT (203 Czech Republic, belonging to the institution)

Edition

Quaternary Science Reviews, Elsevier Ltd, 2024, 0277-3791

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10500 1.5. Earth and related environmental sciences

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 4.000 in 2022

Organization unit

Faculty of Science

UT WoS

001239859800001

Keywords in English

Antarctica; Palaeolimnology; Lake sediments; Radiocarbon; OSL dating; Deglaciation; Diatoms; Faunal subfossils; Holocene; Neoglacial

Tags

Tags

International impact, Reviewed
Změněno: 16/7/2024 09:45, Mgr. Marie Šípková, DiS.

Abstract

V originále

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 of ∼1 mm yr−1. 14C 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 last ∼2.2 ka BP (maximum age), suggesting a markedly decreased sedimentation rate of ∼0.05 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.

Links

EF16_013/0001708, research and development project
Name: ECOPOLARIS - Změny ve struktuře a funkci součástí terestrických polárních ekosystémů (CzechPolar2)
EF16_027/0008360, research and development project
Name: Postdoc@MUNI
GN22-20621O, research and development project
Name: Souvislost kvartérních a současných geomorfologických procesů v geosystémech přiléhajících k polárním ledovcům a ledovcovým štítům
Investor: Czech Science Foundation, Outgoing
VAN 2021, interní kód MU
Name: Český antarktický výzkumný program 2021 (Acronym: CARP 2021)
Investor: Ministry of Education, Youth and Sports of the CR
VAN 2022, interní kód MU
Name: Český antarktický výzkumný program 2022 (Acronym: CARP 2022)
Investor: Ministry of Education, Youth and Sports of the CR, Czech Antarctic Research Programme 2022, Antarctic research