A research team from Friedrich-Alexander-Universitat Erlangen-Nurnberg (FAU) conducted the first study of area and elevation changes for all Alpine glaciers over a period of 14 years. This involved comparing three-dimensional terrain models obtained from the German radar satellite mission TanDEM-X and the German-US Shuttle Radar Topography Mission (SRTM) between 2000 and 2014. The team combined the elevation models with optical images from NASA's Landsat satellites.

They found that the Alps have lost approximately 17 percent of their total ice volume since the turn of the millennium. The team recently published the results of their study in the journal Nature Communications.

A 17-percent loss in ice volume is equivalent to more than 22 cubic kilometres. With the exception of the highest elevations in the Central Alps, the melting of ice is now affecting higher glacier regions, and the trend is continuing.

The most significant losses were recorded in the mountain massifs of the Swiss Alps. The large valley glaciers of the Bernese Alps alone lost approximately 4.8 gigatons of ice mass between 2000 and 2014.

On average, the ice thickness decreased by 0.72 metres each year, which corresponds to a volume of almost five cubic kilometres. Local melting rates were several times higher in the lower reaches of the glaciers. One example is the Great Aletsch Glacier, the largest in the Alps. The surface near the glacier terminus contracted by five metres or more each year due to melting.

The team from the FAU Institute of Geography obtained its findings by combining data from the three Earth observation missions TanDEM-X, SRTM and Landsat. The key benefit of this method was that it enabled an almost simultaneous comparison of area and elevation measurements.

Similar studies from other mountainous regions around the world generally assume that the glaciated surface remains constant throughout the observation period. This can lead to a significant underestimation of the actual mass balance, particularly in highly dynamic glacier regions such as the Alps.

The TanDEM-X radar satellite mission
The TanDEM-X mission is a public-private partnership (PPP) between DLR and Airbus Defence and Space, carried out with funding from the German Federal Ministry for Economic Affairs and Energy (Bundesministerium fur Wirtschaft und Energie; BMWi). DLR is responsible for scientific exploitation of the TanDEM-X data, planning and execution of the mission, control of the two satellites and generation of the digital elevation models.

The DLR Microwaves and Radar Institute, the DLR Remote Sensing Technology Institute (IMF) and the German Remote Sensing Data Center (DFD) in Oberpfaffenhofen are involved in the TanDEM-X mission.

Together, they cover all disciplines that are relevant to the mission: sensor technology, mission design, high-precision operational data processing and provision of optimised products to meet user requirements. They are also responsible, in collaboration with DLR's German Space Operations Center, for the infrastructure - known as the ground segment - required to operate the satellites and for processing the data.

Related Links
TanDEM-X Science Server
Beyond the Ice Age

Tweet

Thanks for being here; We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain. With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords. Our news coverage takes time and effort to publish 365 days a year. If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor $5 Billed Once credit card or paypal		SpaceDaily Monthly Supporter $5 Billed Monthly paypal only

Pink ice in Italy's Alps sparks algae probe
Passo Gavia, Italy (AFP) July 5, 2020
Scientists in Italy are investigating the mysterious appearance of pink glacial ice in the Alps, caused by algae that accelerate the effects of climate change. There is debate about where the algae come from, but Biagio Di Mauro of Italy's National Research Council said the pink snow observed on parts of the Presena glacier is likely caused by the same plant found in Greenland. "The alga is not dangerous, it is a natural phenomenon that occurs during the spring and summer periods in the middle l ... read more