Jurassic dikes of Vestfjella, western Dronning Maud Land, Antarctica: Geochemical tracing of ferropicrite sources

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...

Numerical simulations of major ice streams in western Dronning Maud Land, Antarctica, under wet and dry basal conditions

We study the presence and effect of subglacial water on the motion of inland ice in western Dronning Maud Land, Antarctica. A full-Stokes model including three routing schemes for a thin film of subglacial water and a modification of a Weertman-type sliding relation, to account for higher sliding velocities under wet basal conditions, were used to perform 200 ka spin-up simulations on a 2.5 km ...

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...

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

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 ...