UNAVCO Logo
 
 
Science Help with Science Connections Snapshots Solid Earth Cryosphere Environmental & Hydrogeodesy Ocean Atmosphere Human Dimensions Technology

Cryosphere


Title Date        Category        
Following Solitary Waves in a Greenland Glacier with Geodesy

Greenland’s ice and snow mass has been melting at an accelerated rate for many years. A network of GNSS sites, set-up on coastal bedrock, has been utilized to measure a huge outflow of ice and water in 2012 and 2010 from the Rink Glacier. The horizontal motion at the GNSS site captures a solitary mass transport wave traveling coastward down the glacier in the summers of those two melt years.

Read more
2017-07 Cryosphere
GPS Measurements of Bedrock Uplift in Greenland Improve Ice Loss Estimates

Global Positioning System (GPS) measurements of the uplift of the ground surface beneath the Greenland ice sheet is critical to determining the amount of ice mass that has been lost since the Last Glacial Maximum (LGM). The GPS data show larger uplift rates than previously recognized and suggest that satellite studies have underestimated the ice mass loss by about 20 gigatons per year or about 1.5 meters of sea level rise since the LGM.

Read more
2016-11 Cryosphere
Tracking the Rise of the Antarctic Peninsula with GPS

In Palmer Land, in the southern Antarctic Peninsula, the pattern of deformation measured by a dense network of GPS receivers cannot be explained by our current understanding of ice sheet change across the region. In particular, the GPS measurements indicate that either there was more ice in this region in the past, or ice retreat in the southwestern Weddell Sea region continued until much more recently than previously thought.

Read more
2016-06 Cryosphere
GPS Sensors Capture Glacial Earthquakes

GPS sensors record the motion of the Helheim Glacier in Greenland as ice calving occurs at its terminus. As the iceberg rotates and rolls off sideways, the glacier springs backwards and moves downwards. This action produces an earthquake and the GPS sensors record all the motion and help to explain how glacial earthquakes occur.

Read more
2016-03 Cryosphere
Uplift Rate from Ice Loss on North Antarctic Peninsula Suggests More Fluid Upper Mantle

The North Antarctic Peninsula (NAP) has lost significant ice over decades and the amount and rate of land rebound as the ice is removed can be used to decipher the structure of the crust and upper mantle. Using vertical motion of the land recorded at the Palmer GPS site since 1995, augmented with other GPS data and a simple four-layer model yields a thicker crust and a more fluid upper mantle than expected.

Read more
2015-02 Cryosphere
Unrecognized Rapid Ice Loss in Northeast Greenland Due to Warming

The ice stream in northeast Greenland shows rapid ice loss because of rising air surface temperatures and the loss of sea ice, which is associated with rising sea surface temperatures. The thinning glaciers are detected by a combination of satellite and aerial imagery plus GPS measurements of ground surface rebound.

Read more
2014-04 Cryosphere
Antarctic Ice Cliff Eroding Fast Due to Climate Change

Imaging and other measurements over two years shows that an ice cliff in coastal Antarctica is eroding much faster than in the past 10,000 years due to recent climate changes. The Antarctic landscape is being transformed much faster than natural processes, even though the continent has a relatively small human footprint.

Read more
2013-10 Cryosphere
Observing Abrupt Melting in the Greenland Ice Sheet and Relating Air Mass Changes to Bedrock Changes

Snow and ice melts in Greenland every summer, but the summer of 2010 melting season was so much longer and hotter than in previous years that an extra 100 billion tons of ice melted from the ice sheet and flowed out to sea. GPS measurements captured the extra or anomalous uplift of the bedrock in response to the greater than normal summer loss in ice mass.

Read more
2012-11 Cryosphere
Solving the mysteries of the melting ice sheets: using the details to determine the cause

Researchers have been monitoring melting ice for years in an attempt to understand how ice sheets will affect our changing climate. One way to watch the melting is by using networks of scientific GPS stations such as POLENET. POLENET covers much of the coast of Greenland and Antarctica, as well as a few tall mountains that rise above the ice sheet in the interior of Antarctica. John Wahr of the University of Colorado Boulder works on refining the method of using GPS data to determine melting rates.

Read more
2012-09 Cryosphere
Tracking the melting glaciers of Alaska, pixel by pixel with satellite imagery

Melting continental glaciers, such as the Stikine icefield in Alaska and Canada contribute to rising sea-level, and therefore it is important to monitor how quickly individual glaciers are losing mass.

Read more
2012-09 Cryosphere

Send questions or comments about this page to scienceunavco.org.

Last modified: Wednesday, 12-Jul-2017 17:42:49 UTC

 

Sponsored by

National Science Foundation Logo National Aeronautics and Space Administration Logo