Calving history of Jakobshavn Isbræ

by Thorbjørn Joest Andersen

Core sampling and measurements of water column properties in Disko Fjord and Disko Bay West Greenland, were carried out in July 2013 in cooperation with a field course for geography students at University of Copenhagen.

The research vessel “Porsild” from the Arktisk Station in Qeqertarsuaq served as an excellent platform for the cruise and the skipper and crew made it a nice experience.

The primary goal of the study is to get a better understanding of the temporal variation of calving and melt from the glacier at Jakobshavn (the most productive glacier on the northern hemisphere) during the last 100 – 150 years. Ideally, the sediment cores will show undisturbed sedimentary archives of the variations in sediment flux, which will be driven by changes in calving and melt. However, sediment slumping and bioturbation of the sediments may prove to be challenging obstacles; x-ray photographs will help us to examine this. The core chronologies will be obtained using Pb-210 and Cs-137 dating.

For additional information, contact Thorbjørn Joest Andersen