It is not often that negative results gets published in a high impact journal. Here, we highlight the absence of a systematic pattern in the anatomy of abrupt changes as recorded in different ice parameters.
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Effect of an orientation-dependent nonlinear grain fluidity on bulk directional enhancement-factors
Ice with a strong fabric deforms more readily in some directions. Nicholas Rathmann levels up the theory with a better treatment of how grains influence bulk properties. The impact can be an order of magnitude difference in bulk enhancement factors.
Surface velocity of the Northeast Greenland Ice Stream (NEGIS)
The Northeast Greenland Ice Stream (NEGIS) extends around 600 km from its onset in the interior of Greenland to the coast. Several maps of surface velocity and topography in Greenland exist, but accuracy is limited due to the lack of validation data. Here we present results from a 5-year GPS survey in an interior section of NEGIS. We use the data to assess a list of satellite-derived ice velocity and surface elevation products and discuss the implications for the ice stream flow in the area.
East Greenland ice core dust record reveals timing of Greenland ice sheet advance and retreat
Grains of dust in an ice core illustrate how fast a landscape is covered with ice after an ice age sets in.
Influence of temperature fluctuations on equilibrium ice sheet volume.
Weather variability has a profound impact on the mass balance of ice sheets, and the equilibrium volume of ice sheets. We illustrate this in a simple ice sheet model and find that the equilibrium ice volume is ~1 m SLE smaller when the simple model is forced with fluctuating temperatures as opposed to a stable climate.
Daily Glacier
dailyglacier is a twitter-bot that tweets images of a random glacier every day. This page is used to display additional metadata and maps from the bot. Metadata: Metadata refers to the glacier at the central pixel in the images. Files: image1, image2, gif, mp4 GLIMS ID: RGI ID: Scene 1: Scene 2: Elevation range: Temperature plot: HADCRUT4+CW NCEP/NCAR reanalysis Google maps Google timelapse Glacier Timelapse GEE app timelapse Bing maps Data sources: Randolph Glacier Inventory, Landsat data from USGS EarthExplorer, google mirror of Landsat 4-8, OSM nominatim.
A workflow for video presentations
Video presentations are a powerful way of getting your science across to a wider audience. I recently published a scientific study on some very large Jökulhlaup in East Greenland. I wanted to have a video with the press release, but as our go to guy was on vacation I had to do it myself.
Periodic outburst floods from an ice-dammed lake in East Greenland
We report evidence of four cycles of outburst floods from Catalina Lake, an ice-dammed lake in East Greenland, identified in satellite imagery between 1966–2016. The lake measures 20–25 km2, and lake level drops 130–150 m in each event, corresponding to a water volume of 2.6–3.4 Gt, and a release of potential energy of 1016 J, among the largest outburst floods reported in historical times. The drainage cycle has shortened systematically, and the lake filling rate has increased over each cycle, suggesting that the drainage pattern is changing due to climate warming with possible implications for environmental conditions in Scoresbysund fjord.