Oceans Melting Greenland

Bathymetry data from the OMG Mission derived from the AIRGrav Instrument


The OMG mission has released preliminary free-air gravity data collected over the continental shelf around Greenland's coastline in May, June and July 2016 during the Sander Geophysics Airborne Gravity survey. This data will be inverted to estimate bathymetry in these regions. Although this data will not likely be updated, the project plans to combine bathymetry inversions from this data with the MBES bathymetry measurements in order to generate higher-level products. If you discover any anomalies or inconsistencies with the data or documentation, please let us know by contacting the Principle Investigator for the mission.
Information
DOI10.5067/OMGEV-BTYAG
Short NameOMG_Bathy_AIRGrav
Long NameOMG Bathymetry AIRGrav Data
DescriptionGlobal 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.
Version0.1
Measurement Oceans > Bathymetry/Seafloor Topography
PlatformCessna 208B Grand Caravan operated by Sander Geophysics Limited (SGL)
SensorAirborne Inertially Referenced Gravimeter (AIRGrav)
ProjectOceans Melting Greenland (OMG)

Data Access
PortalOMG Bathymetry AIRGrav Level 0 Line Data
OMG Bathymetry AIRGrav Level 1 Gridded Data
FormatASCII XYZ
ASCII GXF

Citation
CitationOMG Mission. 2016. Airborne Gravity data from the airborne bathymetry survey. Ver. 0.1. OMG SDS, CA, USA. Dataset accessed [YYYY-MM-DD] at http://dx.doi.org/10.5067/OMGEV-BTYAG.