Sea salt sodium record from Talos Dome (East Antarctica) as a potential proxy of the Antarctic past sea ice extent.
Antarctic sea ice has shown an increasing trend in recent decades, but with strong regional differences from one sector to another of the Southern Ocean. The Ross Sea and the Indian sectors have seen an increase in sea ice during the satellite era (1979 onwards). Here we present a record of ssNa+flux in the Talos Dome region during a 25-year period spanning from 1979 to 2003, showing that this marker could be used as a potential proxy for reconstructing the sea ice extent in the Ross Sea and Western Pacific Ocean at least for recent decades. After finding a positive relationship between the maxima in sea ice extent for a 25-year period, we used this relationship in the TALDICE record in order to reconstruct the sea ice conditions over the 20th century. Our tentative reconstruction highlighted a decline in the sea ice extent (SIE) starting in the 1950s and pointed out a higher variability of SIE starting from the 1960s and that the largest sea ice extents of the last century occurred during the 1990s.
University of Florence, Chemistry Dept. "Ugo Schiff", Via della Lastruccia, 3, 50019, Sesto Fiorentino, FI, Italy. Electronic address: mirko.severi@unifi.it.
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Severi
University of Florence, Chemistry Dept. "Ugo Schiff", Via della Lastruccia, 3, 50019, Sesto Fiorentino, FI, Italy.
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Becagli
University of Florence, Chemistry Dept. "Ugo Schiff", Via della Lastruccia, 3, 50019, Sesto Fiorentino, FI, Italy.
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Caiazzo
Laboratory for Earth Observations and Analyses, ENEA, Rome, Italy.
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Ciardini
Department of Mathematics and Geosciences, University of Trieste, Trieste, Italy.
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Colizza
University of Florence, Chemistry Dept. "Ugo Schiff", Via della Lastruccia, 3, 50019, Sesto Fiorentino, FI, Italy.
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Giardi
Department of Mathematics and Geosciences, University of Trieste, Trieste, Italy.
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Mezgec
Laboratory for Earth Observations and Analyses, ENEA, Rome, Italy.
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Scarchilli
Department of Environmental Sciences, Informatics and Statistics, "Ca' Foscari" University of Venice, Italy.
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Stenni
British Antarctic Survey, Cambridge, UK.
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Thomas
University of Florence, Chemistry Dept. "Ugo Schiff", Via della Lastruccia, 3, 50019, Sesto Fiorentino, FI, Italy.
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Traversi
University of Florence, Chemistry Dept. "Ugo Schiff", Via della Lastruccia, 3, 50019, Sesto Fiorentino, FI, Italy; ISAC CNR, Via Gobetti 101, 40129, Bologna, Italy.
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Udisti
D000864:Antarctic Regions; D002980:Climate; D046448:Ice Cover; D016014:Linear Models; D055904:Meteorology; D010140:Pacific Ocean; D012623:Seawater / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*
D012964:Sodium
Antarctica; Climate change; Ice-core; Paleo reconstruction; Ross Sea; Sea-ice