Stable-isotope records from Dronning Maud Land, Antarctica


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hoerter [ at ] awi-bremerhaven.de

Abstract

<jats:title>Abstract</jats:title><jats:p>The European Project for Ice Coring in Antarctica (EPICA) includes a comprehensive pre-site survey on the inland ice plateau of Dronning Maud Land. This paper focuses on the investigation of the <jats:sup>18</jats:sup>O content of shallow firn and ice cores. These cores were dated by profiles derived from dielectric-profiling and continuous flow analysis measurements. the individual records were stacked in order to obtain composite chronologies of <jats:sup>18</jats:sup>O contents and accumulation rates with enhanced signal-to-noise variance ratios. These chronologies document variations in the last 200 and 1000 years. The<jats:sup>18</jats:sup>O contents and accumulation rates decreased in the 19th century and increased during the 20th century. Using the empirical relationships between stable isotopes, accumulation rates and the 10 m firn temperature, the variation of both parameters can be explained by the same temperature history. But other causes for these variations, such as the build-up of the snow cover, cannot be excluded. A marked feature of the 1000 year chronology occurs during the period AD 1180–1530 when the <jats:sup>18</jats:sup>Ocontents remains below the long-term mean. Cross-correlation analyses between five cores from the Weddell Sea region and Dronning Maud Land show that <jats:sup>18</jats:sup>O records can in some periods be positively correlated and in others negatively correlated, indicating a complex climatic history in time and space.</jats:p>



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Eprint ID
4450
DOI https://www.doi.org/10.3189/172756402781816492

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Graf, W. , Oerter, H. , Reinwarth, O. , Stichler, W. , Wilhelms, F. , Miller, H. and Mulvaney, R. (2002): Stable-isotope records from Dronning Maud Land, Antarctica , Annals of Glaciology, 35 , pp. 195-201 . doi: https://www.doi.org/10.3189/172756402781816492


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