Stable-isotope records from Dronning Maud Land, Antarctica, supplement to: Graf, Wolfgang; Oerter, Hans; Reinwarth, Oskar; Stichler, Willibald; Wilhelms, Frank; Miller, Heinz; Mulvaney, Robert (2002): Stable-isotope records from Dronning Maud Land, Antarctica. Annals of Glaciology, 35, 195-201

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 18O content of shallow firn and ice cores. These cores were dated by profiles derived from dielectric-pro...

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Bibliographic Details
Main Authors: Graf, Wolfgang, Oerter, Hans, Reinwarth, Oskar, Stichler, Willibald, Wilhelms, Frank, Miller, Heinz, Mulvaney, Robert
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2002
Subjects:
Firn auger
Snow pit
Ice drill
EPICA_DML1
EPICA_DML3
EPICA_DML2
EPICA_DML5
Neumayer Station WMO89002
Kohnen Station
European Project for Ice Coring in Antarctica EPICA
Dronning Maud Land
Kohnen
Neumayer
Neumayer Station
Weddell
Weddell Sea
Antarc*
Antarctica
EPICA
Online Access:https://dx.doi.org/10.1594/pangaea.728240
https://doi.pangaea.de/10.1594/PANGAEA.728240
Description
Summary: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 18O 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 18O contents and accumulation rates with enhanced signal-to-noise variance ratios.These chronologies document variations in the last 200 and 1000 years.The 18O 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 10m 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 18O contents remains below the long-term mean. Cross-correlation analyses between five cores from the Weddell Sea region and Dronning Maud Land show that 18O records can in some periods be positively correlated and in others negatively correlated, indicating a complex climatic history in time and space.

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