Carl Anton Wahlström

A century of volume reduction of a small ice cap; Riukojietna Northern Sweden

Datum, tid och plats: Tisdag 21/3, kl 13.00, i U37
Handledare: Ian Brown 
Examinator: Peter Jansson och Gunhild Rosqvist
Masterprogram i glaciologi och polarmiljöer, 120 hp
Examensarbete i naturgeografi och kvartärgeologi, 60 hp

Since the first decades of the 20th century most glaciers in Scandinavia have been receding and due to climate change this will most likely continue throughout the 21st century. Riukojietna, a small ice cap in northern Sweden have been monitored since 1986 but except from mass balance measurements and two maps representing 1960 and 1978 little is known about the glaciers changes over time. From a simple model, older maps and a Light Detection and Ranging (LiDAR) Digital Elevation Model (DEM) four different DEMs representing different stages of the glacier from 1916-2015 have been created. With the DEM and interpolated Ground Penetrating Radar (GPR) data the volumes have been calculated so that the ice volume change could be reviewed.  Averaged climate data for the periods before the different glacier stages have been correlated to data from a weather station at the Riukojietna ice cap to enable a longer review of the climate and se what conditions lead to the different stages. During one century, Riukojietna have shrunken from 6.7 km2 in 1916 to 2.8 km2 in 2015 and lost 64 % of its ice volume from 0.36 km3 to 0.13 km3 in 2015. With the average volume change over the last century the Riukojietna ice cap will be vanished in 55 years.