Multibeam bathymetry processed data (Kongsberg EM 122 entire dataset) of RV METEOR during cruise M86/1c

• Main Authors: Gaide, Stefanie, Wintersteller, Paul, dos Santos Ferreira, Christian
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Bathymetry; CT; File format; File name; File size; M86/1c; M86/1c-track; Meteor (1986); Multibeam Echosounder; Swath bathymetry; Underway cruise track measurements; Uniform resource locator/link to file; Northeast Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.919860; https://doi.org/10.1594/PANGAEA.919860

Bathymetry data was acquired during R/V METEOR cruise M86/1c in the Northeast Atlantic between 06.12.2011 and 23.12.2011. The main aim was the calibration of the EM122 at Gettysburg seamount. CI Citation: Paul Wintersteller ([e-mail]) as responsible party for bathymetry raw data ingest and approval. Description of the data source: During the M86/1c cruise, the hull-mounted KONGSBERG EM122 multibeam echosounder (MBES) was utilized to perform bathymetric mapping in medium to deep waters. Two linear transducer arrays in a Mills Cross configuration transmit acoustic signals of a nominal sonar frequency of 12 kHz. With 432 soundings per swath, the emission cone has a dimension of 150° across track and 1° along track. With a reception obtained from 288 beams, the actual beam footprint is 1° by 2°. Depending on the roughness of the seafloor, the swath width on a flat bottom is generally maximum six times the water depth. For further information on the system, consult https://www.km.kongsberg.com/. The position and depth of the water column is estimated for each beam by using the detected two-way-travel time and the beam angle, ray-traced through the water column, utilizing a proper sound speed profile. During the M86/1c cruise the EM122 operated to map the Gettysburg seamount, while calibrating the EM122. Responsible person during this cruise / PI: Christian dos Santos Ferreira ([e-mail]) Description of data processing: Postprocessing and products were conducted by the Seafloor-Imaging & Mapping group of MARUM/FB5, responsible person Paul Wintersteller ([e-mail]). The open source software MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, https://www.mbari.org/products/research-software/mb-system, 2017) was utilized for this purpose. Tide corrections were applied to the M86/1c data; but corrections for roll, pitch, and heave were not necessary. The sound velocity profiles taken during the cruise were sufficient for the MBES data. Using Mbeditviz, ...