IngentaConnect Ice-Core Study of the Link between Sea-Salt Aerosol, Sea-Ice Cove...

Authors: Aristarain, Alberto¹; Delmas, Robert²; Stievenard, Michel³

Source: Climatic Change, Volume 67, Number 1, November 2004 , pp. 63-86(24)

Publisher: Springer

Abstract:

Three ice cores and a set of snow pit samples collected on James Ross Island, Antarctic Peninsula, in 1979, 1981 and 1991 have been analyzed for water stable isotope content delta

D or

¹⁸O (isotopic temperature) and major chemical species. A reliable and detailed chronological scale has been established first for the upper 24.5 m of water equivalent (1990–1943) where various data sets can be compared, then extended down to 59.5 m of water equivalent (1847) with the aid of seasonal variations and the sulphate peak reflecting the 1883 Krakatoa volcanic eruption. At James Ross Island, sea-salt aerosol is generally produced by ice-free marine surfaces during the summer months, although some winter sea-salt events have been observed. For the upper part of the core (1990–1943), correlations (positive or negative) were calculated between isotopic temperature, chloride content (a sea-salt indicator), sea-ice extent, regional atmospheric temperature changes and atmospheric circulation. The delta

D and chloride content correlation was then extended back to 1847, making it possible to estimate decadal sea-ice cover fluctuations over the study period. Our findings suggest that ice-core records from James Ross Island reflect the recent warming and sea-ice decrease trends observed in the Antarctic Peninsula area from the mid-1940s.

Document Type: Research article

DOI: 10.1007/s10584-004-0708-6

Affiliations: 1: Laboratorio de Estratigrafía Glaciar y Geoquímica del Agua y de la Nieve (LEGAN), Instituto Antártico Argentino and Consejo Nacional de Investigaciones Científicas y Técnicas, CRICYT, Casilla de Correo 131, 5500, Mendoza, Argentina, Email: aristar@lab.cricyt.edu.ar 2: Laboratoire de Glaciologie et Géophysique de l prime Environnement (LGGE), Centre National de la Recherche Scientifique, BP 96, 38402 St. Martin d prime Hères Cedex, France, Environnement (LGGE), Centre National de la Recherche Scientifique, BP 96, 38402 St. Martin d prime Hères Cedex, France, "> 3: Laboratoire des Sciences du Climat et de l prime Environnement (LSCE), Centre d prime Etudes de Saclay, 91191, Gif-sur-Yvette, Cedex, France,Environnement (LSCE), Centre d prime Etudes de Saclay, 91191, Gif-sur-Yvette, Cedex, France,">

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Ice-Core Study of the Link between Sea-Salt Aerosol, Sea-Ice Cover and Climate in the Antarctic Peninsula Area