Access of Atlantic Water to Greenland glaciers (A2Green)
The aim of this project is to examine the access of Atlantic Water to the glaciers in North-East Greenland. This involves using hydrographic observations to determine the processes and pathways by which the warm Atlantic Water crosses the Fram Strait, onto the NE Greenland continental shelf and into the fjords. The warm Atlantic water (AIW) has been observed on both the Greenland continental shelf and in numerous fjords where marine-terminatinf glaciers are found, and suspected to govern the intensity of the ocean-driven melting.
Two ocean-glacier systems are the focus of this work - between 79N Glacier (79⁰ N) at the northern end of the region and Scoresby Sund (69⁰ N) at the southern end of the domain - to examine the pathways of the AIW across the entire East Greenland shelf.
The three main objectives are:
1. Investigate large scale changes of the AIW on the NE Greenland shelf and drivers of this variability between inter-annual and decadal scales.
2. Determine the role of the continental shelf on the transport of AIW on the shelf, and the impact of shelf processes on the AIW properties flowing towards the glaciers.
3. Assess the control of bathymetry in constraining the access of AIW to fjords and ice-sheet cavities.
The in-situ observations combine historic and recent hydrographic and bathymetric data sets in the Fram Strait, from the outer, mid and inner East Greenland shelf, and from the two fjord systems, across this range of spatial and time scales.
Mayer, C., Schaffer, J., Hattermann, T., Floricioiu, D., Dodd, P.A., Kanzow, T., Licciullo, C., and Schannwell, C. (2018): Large ice loss variability at Nioghalvfjerdsfjorden Glacier, Northeast-Greenland, Nature Communication, 9, 2768, doi:10.1038/s41467-018-05180-x.
Polyakov, Igor V., Andrey V. Pnyushkov, Matthew B. Alkire, Igor M. Ashik, Till M. Baumann, Eddy C. Carmack, Ilona Goszczko, John Guthrie, Vladimir V. Ivanov, Torsten Kanzow, Richard Krishfield, Ronald Kwok, et al. n. Greater role for Atlantic inflows on sea-ice loss in the Eurasian Basin of the Arctic Ocean. Science, 2017; eaai8204 DOI: 10.1126/science.aai8204
Schaffer, J., Timmermann, R., Arndt, J. E., Kristensen, S. S., Mayer, C., Morlighem, M., and Steinhage, D. (2016): A global high-resolution data set of ice sheet topography, cavity geometry and ocean bathymetry, Earth Syst. Sci. Data, 8, 543-557, doi: 10.5194/essd-8-543-2016
Schaffer, J., von Appen, W.-J., Dodd, P. A., Hofstede, C.,Mayer, C., de Steur, L., and Kanzow, T. (2017): Warm water pathways toward Nioghalvfjerdsfjorden Glacier, Northeast Greenland, J. Geophys. Res. Oceans, 122, 4004–4020, doi: 10.1002/2016JC012462.