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Reconstruction of Antarctic Climate Change Using Ice Core Proxy Records from the Coastal Dronning Maud Land, East Antarctica
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Antarctic ice core records have provided unprecedented information on past climatic changes and forcing factors on decadal to millennial timescales. The glaciochemical and stable isotope records of a shallow ice core from the coastal Dronning Maud Land (East Antarctica) were used here to reconstruct the coastal Antarctic environmental variability during the past ~470 years. Sea salt ion data indicate a significant additional contribution of chloride ions compared to sea water values, possibly through atmospheric scavenging. The nitrate (NO3 -) profile exhibit significant temporal shifts than that of the sulphate (SO4 2-), with a major shift around 1750 AD. The changes in NO3 - record are synchronous with the proxy record of solar activity ( 10Be profile from a South Pole ice core), suggesting enhanced NO3 - values during periods of reduced solar activity like the Dalton Minimum (~1790-1830 AD) and Maunder Minimum (~1640- 1710 AD). The δ18O records reveal that the more negative V values were coeval with several events of increased NO3 - concentrations, suggesting enhanced preservation of NO3 - during periods of reduced air temperatures. The δ18O and δD records of the core also suggest significant short-term and long-tem variability with more negative values indicating relatively lower air temperatures prior to 1715 AD. The δ18O records also revealed a significant warming of 2.7°C for the past 470 years, with a warming of ~0.6°C per century.
Keywords
Glaciochemistry, Stable Isotope, Ice Core, Solar Activity, Dronning Maud Land, Antarctica.
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