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Publication . Article . Other literature type . 2021

Dating of the GV7 East Antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium

Raffaello Nardin; Mirko Severi; Alessandra Amore; Silvia Becagli; Francois Burgay; Laura Caiazzo; Virginia Ciardini; +11 Authors
Open Access
Published: 13 Oct 2021 Journal: Climate of the Past, volume 17, pages 2,073-2,089 (eissn: 1814-9332, Copyright policy )
Publisher: Copernicus GmbH
Country: Italy
Abstract

Ice core dating is the first step for a correct interpretation of climatic and environmental changes. In this work, we release the dating of the uppermost 197 m of the 250 m deep GV7(B) ice core (drill site, 70∘41′ S, 158∘52′ E; 1950 m a.s.l. in Oates Land, East Antarctica) with a sub-annual resolution. Chemical records of NO3-, MSA (methanesulfonic acid), non-sea-salt SO42- (nssSO42-), sea-salt ions and water stable isotopes (δ18O) were studied as candidates for dating due to their seasonal pattern. Different procedures were tested but the nssSO42- record proved to be the most reliable on the short- and long-term scales, so it was chosen for annual layer counting along the whole ice core. The dating was constrained by using volcanic signatures from historically known events as tie points, thus providing an accurate age–depth relationship for the period 1179–2009 CE. The achievement of the complete age scale allowed us to calculate the annual mean accumulation rate throughout the analyzed 197 m of the core, yielding an annually resolved history of the snow accumulation on site in the last millennium. A small yet consistent rise in accumulation rate (Tr = 1.6, p<0.001) was found for the last 830 years starting around mid-18th century.

Subjects by Vocabulary

Microsoft Academic Graph classification: Period (geology) Ice core Drill site High resolution Snow Physical geography Volcano geography.geographical_feature_category geography Geology Stable isotope ratio East antarctica

Subjects

Paleontology, Stratigraphy, Global and Planetary Change, Ice core, antarctica, volcanic eruptions, Environmental pollution, TD172-193.5, Environmental protection, TD169-171.8, Environmental sciences, GE1-350, Settore GEO/08 - Geochimica e Vulcanologia, Antarctica, Ice core, peloclimate

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