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200 years of isotope and chemical records in a firn core from Hercules Névé, northern Victoria Land, Antarctica

  • B. Stenni (a1), R. Caprioli (a2), L. Cimino (a2), C. Cremisini (a2), O. Flora (a1), R. Gragnani (a2), A. Longinelli (a1), V. Maggi (a3) and S Torcini (a2)...

Abstract

A 42.2 m firn core was collected at the Hercules Névé plateau (100 km inland and 2960 m a.s.L), northern Victoria Land, during the 1994-95 Italian Antarctic Expedition. Chemical (Cl, NO3 , SO4 2–’; δ18O δ18O δ18O; m-2a-1) and isotope (5180) analyses were performed to evaluate the snow-accumulation rate at this site. Tritium measurements were performed in the upper part of the core to narrow down the dating of the core.

High nssSO4 2- concentrations seem to be related to some explosive volcanic eruptions, such as Tambora (AD 1815) and the preceding event called "Unknown" (AD 1809), Coseguina (AD 1835), Makjan (AD 1861), Krakatoa (AD 1883) and Tarawera (AD 1886).

A comparison between the seasonal variations observed in the isotope and chemical profiles was carried out in order to reduce the dating uncertainty, using the tritium and the volcanic markers as time constraints. A deposition period of 222 years was determined.

The 3 year smoothed «5180 profile shows more negative values from the bottom of the core (dated AD 1770) throughout the 19th century, suggesting "cooler" conditions, in agreement with other East Antarctic ice-core records! Subsequently, a general increase in δ180-values is observed.

The calculated average snow-accumulation rates between the above-mentioned time markers are 111-129 kg m-2a-1.

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