Master thesis defense by Ying Yu

Title: Temperatures in Northern Greenland from 1952 to 2019 and Water Isotope Data from the Hans Tausen Ice Core

Abstract: The climate in the Arctic region is changing rapidly, but for northern Greenland climate records are sparse and discontinuous. To investigate climate evolution since the 1950s available temperature observations are compiled into two continuous series from northern Greenland. Interestingly, these new series show rapid warming in recent decades, with the temperature rise in the northernmost location being the largest in all of Greenland. The new temperature series are also compared to water isotope data from the ice core drilled through the Hans Tausen Ice Cap in 1995. These ice core data are influenced by both surface melt and firn diffusion, but after careful data treatment annual average accumulation and isotope data are recovered. Surprisingly, an inverse relationship between summer temperature and accumulation rate is found, suggesting higher temperatures are associated with reduced accumulation until 1995.

Supervisor: Bo Møllesøe Vinther

Censor: Sebastian Bjerregaard Simonsen, DTU Space

Place: Online: