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Institutskolloquium Physische Geographie – 26.06.2019

The influence of climatic variability on glacier surface melt processes in northeast Greenland

Philipp Hochreuther, Nathalie Reimann & Jenny Turton

left: Termini of 79°N- and Zachariae glaciers in natural colour (Sentinel-2) for July 20, 2016, with mask of detected meltwater ponds (light blue). Right: WRF model output for the same day, with colour-coded temperature (red=high) and wind speed and direction (arrows).

More than one quarter of the current global sea level rise is caused by the mass loss of the Greenland ice sheet. The strongest mass loss has been observed at the large outlet glaciers, which are increasingly retreating, losing ice thickness and whose ice velocities are accelerating. The only big ice stream of Greenland (Northeast Greenland Icestream, NEGIS) is draining via three glaciers into the Atlantic Ocean, of which 79°N glacier is the largest. Within the frame of the project ‚Greenland Ice sheet Ocean Interaction‘ (https://groce.de/), we concentrate on the interactions between the glacier surface and climate. Glacier surface melt is analysed through detection and time series analysis of supra-glacial meltwater lakes using ESA‘s new Sentinel-2 satellites, starting from 2016. The dense high-resolution time series enables, in addition to the surface condition of the glacier, a detailed comparison of the melt cycle in different years in terms of start, duration and intensity. Focusing on the years 2016 to 2018, we investigate the interaction between the climate and the melt conditions, in an attempt to assess which atmospheric processes are responsible for spatially vast areas of melt (2016) and reduced melt (2018). We will use meteorology data from in-situ locations, reanalysis products and a regional atmospheric model to separate the ‚local‘ vs ‚global‘ influence of climate on supraglacial melting of 79°N glacier.

Wann: Mittwoch, 26.06.2019 um 12:30 Uhr
Wo: Seminarraum 2, 00.175, Wetterkreuz 15, Tennenlohe

Gesamtübersicht Institutskolloquium Sommersemester 2019

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Zukünftig werden pro Semester bis zu vier Kolloquiumsvorträge im Hörsaal C (Kochstr. 4, Innenstadt) angeboten.
Zusätzlich finden spezielle, mehr forschungsorientierte Kolloquiumsvorträge in den Seminarräumen im Institut für Geographie (Wetterkreuz 15, Erlangen-Tennenlohe) statt.

Die Teilnahme sowohl an Vorträgen in Tennenlohe als auch im Hörsaal C werden durch Abstempeln im Kolloquiumspass als Leistungsnachweis dokumentiert, dasselbe gilt  weiterhin auch für den Besuch des Geo-Cafés und der FGG-Vorträge.

Fragen zum Kolloquium?
Organisatoren Dr. Andrés Gerique (andres.gerique-zipfel@fau.de) und Dr. Christoph Mayr (christoph.mayr@fau.de).