Timing of the neoglacial onset on the North-Eastern Antarctic Peninsula based on lacustrine archive from Lake Anónima, Vega Island

0519769 - ÚVGZ 2021 RIV NL eng J - Journal Article
Čejka, Tomáš - Nývlt, D. - Kopalová, Kateřina - Bulínová, M. - Kavan, J. - Lirio, J.M. - Coria, S.H. - Van de Vijver, B.
Timing of the neoglacial onset on the North-Eastern Antarctic Peninsula based on lacustrine archive from Lake Anónima, Vega Island.
Global and Planetary Change. Roč. 184, JAN (2020), č. článku 103050. ISSN 0921-8181. E-ISSN 1872-6364
Research Infrastructure: CzeCOS II - 90061
Institutional support: RVO:86652079 ; RVO:67985939
Keywords : Antarctic Peninsula * James Ross Archipelago * Lake record * Mid-late Holocene hypsithermal * Multi-proxy * Neoglacial
OECD category: Physical geography; Geology (BU-J)
Impact factor: 5.114, year: 2020
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0921818119305351?via%3Dihub

To understand the complexity of the climate patterns in the Holocene, it is necessary to build detailed chronologies that provide a holistic picture of the individual climate periods occurring in the polar regions. In this regard, here we present a completely new, 14C-dated and synchronised multi-proxy chronology from the Lake Anónima (Vega Island, north-eastern Antarctic Peninsula) that provides a unique insight into the Late Holocene environment. In particular, we aim to interpret the substantial environmental and climatic change between the mid-late Holocene Hypsithermal and Neoglacial periods using various geochemical (total organic carbon, X-ray fluorescence spectroscopy), petrophysical (magnetic susceptibility, laser granulometry) and biological (diatom biostratigraphy) proxies. The termination of the mid-late Holocene Hypsithermal, characterised by overall warmer climate with favourable conditions for biogenic productivity, is followed by the regional-scale Neoglacial period, distinctive by the onset of climate deterioration, decreased siliciclastic input, suppressed biogenic (diatom) productivity and low organic content. Based on a principal component analysis, a multi-proxy record provides the precise timing of the Neoglacial onset in the Lake Anónima record at 2050 (2σ: 1990–2130) cal. yrs BP. Applying an adjacent and correlative ice-core (James Ross Island ice cap, r = 0.42), as well as a composite lake sediment (Beak Island, r = 0.49) chronologies, our research provides a refined timing of the Neoglacial onset for the north-eastern Antarctic Peninsula, which is determined to be 2070 ± 50 yrs. BP. Moreover, the Neoglacial onset was compared with other studies from respective parts of the Antarctic Peninsula.
Permanent Link: http://hdl.handle.net/11104/0304772