Westphal, Hildegard; Schilling, Stephen; Freiwald, André; Hanebuth, Till J J; Wintersteller, Paul (2019): MSM16/3 raw data of EM120 multibeam echosounder (bathymetry & beam time series) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.901660
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Published: 2019-05-15 • DOI registered: 2020-08-01
Abstract:
Bathymetric data based on the multibeam echosounders (MBES) KONGSBERG EM120 and EM1002 was conducted during R/V MARIA S. MERIAN cruise MSM16/3 between 13.10.2010 and 20.11.2010 in the Eastern Atlantic off Mauritania. The expedition aimed at a comprehensive understanding of the complex sedimentary system on the Mauritian Shelf as an atypical tropical eutrophic ecosystem and an archive of palaeoclimatic change in Africa during the Holocene. During the expedition, the chain of Mauritian coral reef mounds was mapped for the first time, carbonate-producing organisms successfully sampled and the flooding history of the Golfe d'Arguin investigated. Hydroacoustic surveys were conducted for a better understanding of the topography, and particularly for the identification of coral mounds and their morphological and structural patterns. In addition to bathymetric mapping, further instruments complemented the research programme, such as the sub-bottom profiler PARASOUND, a fast-rescue boat for shallow water surveys, various sediment sampling and coring devices, a CTD, an aerial dust collector and a remotely operated vehicle (ROV).
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 MSM16/3 expedition, the hull-mounted KONGSBERG EM120 multibeam ecosounder (MBES) was utilized for bathymetric mapping in water depth beyond 800 m as it allows accurate bathymetric mapping up to full ocean depth. Two linear transducer arrays in Mills Cross configuration transmit a nominal sonar frequency of 12 kHz with an emission beam of 150° across track and 1° along track, and receive 191 beams with widths of 2° across track and 20° along track. The actual footprint of a beam has a dimension of 1° by 2°. On flat bottom, the achievable swath width can reach up to six times the water depth. The angular coverage sector and beam pointing angles were set to vary automatically with depth according to achievable coverage. For further information on the system, consult https://www.km.kongsberg.com/.
The depth of the water column is estimated through the two-way-travel time, beam angle and ray bending due to refraction in the water column by sound speed variations. Combining amplitude (for central beams) and phase (for slant beams) provides accuracy practically independent of the beam-pointing angle.
Responsible persons during this cruise / PI: Andre Freiwald (andre.freiwald@senckenberg.de), Till Hanebuth (thanebuth@coastal.edu) & Stephen Schilling
Chief Scientist: Hildegard Westphal (hildegard.westphal@zmt-bremen.de)
Further details:
Westphal, Hildegard; Beuck, Lydia; Braun, Stefan; Freiwald, André; Hanebuth, Till J J; Hetzinger, Steffen; Klicpera, André; Kudrass, Hermann-Rudolph; Lantzsch, Hendrik; Lundälv, Tomas; Vicens, Guillem Mateu; Preto, Nereo; von Reumont, Jonas; Schilling, Stephen; Taviani, Marco; Wienberg, Claudia (2014): Phaeton - Paleoceanographic and paleo-climatic record on the Mauritanian Shelf - Cruise No. MSM16/3 - October 13 - November 20, 2010 - Bremerhaven (Germany) - Mindelo (Cap Verde). MARIA S. MERIAN-Berichte, DFG-Senatskommission für Ozeanographie, MSM16/3, 57 pp, https://doi.org/10.2312/cr_msm16_3
Project(s):
Coverage:
Median Latitude: 35.226800 * Median Longitude: -8.221400 * South-bound Latitude: 16.886100 * West-bound Longitude: -24.997600 * North-bound Latitude: 53.567500 * East-bound Longitude: 8.554800
Date/Time Start: 2010-10-13T00:00:00 * Date/Time End: 2010-11-20T00:00:00
Event(s):
MSM16/3-track * Latitude Start: 53.567500 * Longitude Start: 8.554800 * Latitude End: 16.886100 * Longitude End: -24.997600 * Date/Time Start: 2010-10-13T00:00:00 * Date/Time End: 2010-11-20T00:00:00 * Campaign: MSM16/3 * Basis: Maria S. Merian * Method/Device: Underway cruise track measurements (CT) * Comment: Bremerhaven - Mindelo
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | File name | File name | Wintersteller, Paul | |||
| 2 | File format | File format | Wintersteller, Paul | |||
| 3 | File size | File size | kByte | Wintersteller, Paul | ||
| 4 | Uniform resource locator/link to file | URL file | Wintersteller, Paul |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB) * Processing Level: PANGAEA data processing level 1 (ProcLevel1)
Size:
600 data points