|Description||Global sea level rise will be one of the major environmental challenges of the 21st Century. Oceans Melting Greenland (OMG) will pave the way for improved estimates of sea level rise by addressing the question: To what extent are the oceans melting Greenland’s ice from below? Over a five-year campaign, OMG will observe changing water temperatures on the continental shelf surrounding Greenland, and how marine glaciers react to the presence of warm, salty Atlantic Water. The complicated geometry of the sea floor steers currents on the shelf and often determines whether Atlantic Water can reach into the long narrow fjords and interact with the coastal glaciers. Because knowledge of these pathways is a critical component of modeling the interaction between the oceans and ice sheet, OMG will facilitate improved measurements of the shape and depth of the sea floor in key regions as well.|
The airborne gravity survey was carried out by Sander Geophysics using fixed-wing aircraft flying at speeds of about 120 nautical miles per hour at a line spacing of 2 to 4 killometers. The data include both free air gravity in mGal and its first vertical derivative. This is provided in the form of Level 1 gridded files (two file types, .xyz and .gxf) as well as Level 0 data along the flight lines. As part of OMG, this data will be combined with other bathymetry data to produce higher-level maps of the sea floor depth. Since these data will be used to improve maps of sea floor shape and depth, the word "bathymetry" is used to describe several of the products. The underlying measurement, however, was free-air gravity.
||Oceans > Bathymetry/Seafloor Topography
|Campaign||The OMG mission flew one campaign in May, June and July 2016 during the Sander Geophysics Airborne Gravity survey.|
|Platform||Cessna 208B Grand Caravan operated by Sander Geophysics Limited (SGL)|
|Sensor||Airborne Inertially Referenced Gravimeter (AIRGrav)|
|Project||Oceans Melting Greenland (OMG)|