Ice-Core Study of the Link between Sea-Salt Aerosol,Sea-Ice Cover and Climate in the Antarctic Peninsula Area |
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| Authors: | Email author" target="_blank">Alberto?J?AristarainEmail author Robert?J?Delmas Michel?Stievenard |
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| Institution: | (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;(2) Laboratoire de Glaciologie et Géophysique de l Environnement (LGGE), Centre National de la Recherche Scientifique, BP 96, 38402 St. Martin dHères Cedex, France;(3) Laboratoire des Sciences du Climat et de lEnvironnement (LSCE), Centre dEtudes de Saclay, 91191 Gif-sur-Yvette, Cedex, France |
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| 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  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 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. |
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