Oceans Melting Greenland

Bathymetry data from the OMG Mission derived from Singlebeam and Multibeam Echo Sounder Systems

The OMG mission has released bathymetry data collected from Greenland's coastline in July, August and September 2015 during Phase 1 and 2 of the TerraSond / Cape Race Bathymetry survey as well as data collected by the Ocean Research Project in August and September of 2015 and June through September of 2016. Although this data will not likely be updated, the project plans to combine this data with additional bathymetry data 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.
Short NameOMG_Bathy
Long NameOMG Bathymetry SBES/MBES 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 bathymetry survey was primarily conducted using multi-swath Multibeam Echo Sounder System (MBES) equipment and procedures. MBES uses a sonar that produces an angular swath of beams to the port and starboard side in a single ping to effectively map a corridor with a width approximately 3-4 times the water depth. In addition to the multibeam echosounder, several more instruments are required on the vessel to georeference the raw multibeam data into corrected soundings. A GPS installed on the vessel is used to accurately position the location of the multibeam. Data from a pitch, roll, heave and heading sensor is used to correct the raw sounding based on the vessels attitude at the time the sonar ping. The sound velocity of the water column is required to convert the soundings from raw time-of-flight measurements to a corrected range as well as correct the sounding for refraction as it passes through the water column. Additional bathymetry data was collected by a smaller vessel using a Singlebeam Echo Sounder System (SBES). The SBES data provides only a single measurement of water depth, directly beneath the ship, but this data was collected in a few regions where the MBES survey was not able to reach.
Measurement Oceans > Bathymetry/Seafloor Topography > Bathymetry
Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
Oceans > Bathymetry/Seafloor Topography > Water Depth
M/V Cape Race vessel operated by TerraSond LimitedTeledyne Reson SeaBat 7160 Multibeam Echo Sounder System (MBES)
M/V Neptune vessel operated by TerraSond LimitedTeledyne Reson SeaBat 7160 Multibeam Echo Sounder System (MBES)
M/V Ivilia operated by Arctic Access / UCITeledyne Reson SeaBat 7111 Multibeam Echo Sounder System (MBES)
R/V Ault operated by Ocean Research Project (ORP)Multiple Singlebeam Echo Sounder Systems (SBES)
ProjectOceans Melting Greenland (OMG)

Data Access
PortalOMG Bathymetry MBES Level 2 Gridded Data
OMG Bathymetry SBES Level 2 Gridded Data (Updated on May 18, 2018)

CitationOMG Mission. 2016. Bathymetry (sea floor depth) data from the ship-based bathymetry survey. Ver. 0.1. OMG SDS, CA, USA. Dataset accessed [YYYY-MM-DD] at http://dx.doi.org/10.5067/OMGEV-BTYSS.