Citation:

PANGAEA.905553

Name: M84/4 raw data of EM122 multibeam echosounder (bathymetry & beam time series)
Published: 2019-09-04
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Bathymetry; EM122; Galician Shelf; hydroacoustics; Northeast Atlantic; seismics

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Abstract:

Bathymetry data was acquired during R/V METEOR cruise M84/4 at the Galician Shelf off Northwest Spain in the Northeast Atlantic between 01.05.2011 and 28.05.2011. The main objectives of the cruise were the investigation of sediment transport processes from shallow to deep waters, understanding sediment dynamics, analysis of material downslope processes and the reconstruction of modern and past environmental conditions. The cruise comprised seismic, sedimentological, magnetic, geochemical and palaeoceanographic methods.

Extensive bathymetric mapping during M84/4 based on the multibeam echosounders (MBES) KONGSBERG EM710 and EM122 provided the basis for sediment coring and additional investigations. Hydroacoustic data revealed the diverse morphology in the study area, driven by both sedimentary and tectonic processes, including contouritic deposits, slope gullies, canyon/channel systems, ridges and seamounts. The sub-bottom profiler PARASOUND, multichannel seismics, ADCP, several coring devices and the electromagnetic profiler MARUM-NERIDIS III complemented the research programme of the cruise.

CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval.

Description of the data source:

During the M84/4 cruise, the hull-mounted KONGSBERG EM122 multibeam ecosounder (MBES) was utilized to perform bathymetric mapping in middle to deep water depths. 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°. 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 known for each beam and taking ray bending due to refraction in the water column by sound speed into account. During the M84/4 cruise, the EM122 was running simultaneously with the EM710 and PARASOUND sub-bottom profiling system. Acquisition of EM122 data was reliable during the whole cruise, but data quality declined during rough weather conditions, causing wobbling in depths of more than 2000m.

Special thanks to the watchkeepers during this cruise: Lenhart, Antje; Haberkorn, Julia; Petrovic, Alexander; Schwab, Arne; Wenau, Stefan.

Chief Scientist: Till J. J. Hanebuth (thanebuth@coastal.edu)

CR: https://www.tib.eu/de/suchen/id/awi%3Adoi~10.2312%252Fcr_m84_4/

CSR: https://www.ldf.uni-hamburg.de/meteor/wochenberichte/wochenberichte-meteor/m84/m84-4-scr.pdf

Keyword(s):

Bathymetry; EM122; Galician Shelf; hydroacoustics; Northeast Atlantic; seismics

Related to:

Wintersteller, Paul; Gaide, Stefanie (2019): Gridded bathymetry from EM122 multibeam echosounder of RV METEOR cruise M84/4 (Northeast Atlantic). PANGAEA, https://doi.org/10.1594/PANGAEA.902504

Further details:

Hanebuth, Till J J; Alekseev, Vasily; Andrade Grande, Alba; Baasch, Benjamin; Baumann, Karl-Heinz; Behrens, Philipp; Bender, Vera Barbara; von Dobeneck, Tilo; dos S. Marques, Ana Isabel; Frederichs, Thomas; Haberkorn, Julia; Hangen, Jannes; Hilgenfeldt, Christian; Just, Janna; Kockisch, Brit; Lantzsch, Hendrik; Lenhart, Antje; Lipke, Anna; Lobo Sánchez, Francisco; Mena Rodríguez, Àngel; Müller, Hendrik; Petrovic, Alexander; Rodríguez Germade, Isabel; Roud, Sophie; Schwab, Arne; Schwenk, Tilmann; Voigt, Ines; Wenau, Stefan (2012): Galiomar III - Cruise No. M84/4 - May 01 - May 28, 2011 - Vigo (Spain) - Vigo (Spain). METEOR-Berichte, DFG-Senatskommission für Ozeanographie, M84/4, 58 pp, https://doi.org/10.2312/cr_m84_4

Project(s):

Center for Marine Environmental Sciences (MARUM)

Coverage:

Latitude: 42.234500 * Longitude: -8.740400

Date/Time Start: 2011-05-01T00:00:00 * Date/Time End: 2011-05-28T00:00:00

Event(s):

M84/4-track * Latitude Start: 42.234500 * Longitude Start: -8.740400 * Latitude End: 42.234500 * Longitude End: -8.740400 * Date/Time Start: 2011-05-01T00:00:00 * Date/Time End: 2011-05-28T00:00:00 * Campaign: * Basis: * Method/Device: Underway cruise track measurements (CT) * Comment: Vigo - Vigo

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator
1	File name	File name		Hanebuth, Till J J
2	File format	File format		Hanebuth, Till J J
3	File size	File size	kByte	Hanebuth, Till J J
4	Uniform resource locator/link to file	URL file		Hanebuth, Till J J

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

9820 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

Only the first 2000 rows were shown. To view the complete dataset, download it as tab-delimited text. You can still view the full matrix in your browser, but be aware that this may crash the browser due to the huge size.

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