Chapter 2.3 Dronning Maud Land Jurassic volcanism: volcanology and petrology

Moisture source of precipitation in Western Dronning Maud Land, Antarctica

Moisture sources for snow falling in Dronning Maud Land (DML), Antarctica, are calculated for 1998 using three dimensional 5-days backward air parcel trajectories. The drilling site of the European Project onIce CoringinAntarctica(EP1CA) inDMLischosenasthemainarrivalpoint (75.0°S, 0.01"E). Adistinction is made between trajectories with and without snowfall at arrival. Of the snowfall trajectori...

Evidence for physical and chemical stratification in Lake Untersee (central Dronning Maud Land, East Antarctica)

Lake Untersee is the largest freshwater lake in the interior of East Antarctica. It is a perennially ice-covered, max. 169 m deep, ultra-oligotrophic lake. In contrast to earlier studies, we found clear evidence for physical and chemical stratification in the summer of 1991-92. However, the stratification was restricted to a trough, c. 500 m wide and up to 105 m deep, in the south-western part ...

A High-Altitude Snow Chemistry Record from Amundsenisen, Dronning Maud Land, Antarctica

Biogeochemistry of methane in the permanently ice-covered Lake Untersee, central Dronning Maud Land, East Antarctica

We found unprecedentedly high abundances of microbially produced CH4 in the anoxic deep waters of Lake Untersee, an oligotrophic, perennially ice-covered Antarctic freshwater lake. The maximum CH4 concentration (approaching 21.8 6 1.4 mmol L21) is one of the highest observed so far in a natural aquatic ecosystem. Although surficial lake sediments are the predominant source of CH4 in Lake Unters...

Characterizing the glaciological conditions at Halvfarryggen ice dome, Dronning Maud Land, Antarctica

We present a comprehensive approach (including field data, remote sensing and an anisotropic ice-flow model) to characterize Halvfarryggen ice dome in coastal Dronning Maud Land, Antarctica. This is a potential drill site for the International Partnerships in Ice Core Sciences, which has identified the need for ice cores covering atmospheric conditions during the last few millennia. We derive t...