Gridded bathymetry from multibeam echosounder EM120 data of the cruise M72/3a and M72/3b (2007)
Bathymetry based on data recorded during M72-3 between 17.03.2007 and 23.04.2007 in the Black Sea. This cruise concentrated on interdisciplinary work on gas hydrates with a main focus on the gas hydrate transition zone in and below 750 m water depth. Main working areas were the Sorokin Trough, an area south of the Kerch Strait and the Andrusov Ridge in Ukrainian waters and the Gudauta Ridge and Gurian Trough in Georgian waters.
CI Citation: Paul Wintersteller ( seafloor-imaging@marum.de ): Responsible party for bathymetry post-processing and author of the product.
What
Metadata details
- File identifier
- SDN_CPRD_1568_M72-3_2007_EM120_Bathymetry
- Catalogue type
-
Composite Product Record
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Project name
-
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EMODNet Bathymetry
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- Dissemination level
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public
- Metadata language
- English
- Date stamp
- 2018-01-18T13:19:02
Identification
- Dataset name
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Gridded bathymetry from multibeam echosounder EM120 data of the cruise M72/3a and M72/3b (2007)
- Short name of dataset (SDN Local Product-ID)
-
M72-3_2007_EM120_Bathymetry
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Parameter Discovery Vocabulary (P02)
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Bathymetry and Elevation
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Measuring devices
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multi-beam echosounders
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multi-beam echosounders
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Measuring devices
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Differential Global Positioning System receivers
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Geometry
- Spatial representation type
- Grid
- Number of columns
- 11983
- Number of lines
- 5059
- Pixel size
- 125 Metres (m)
- Maximum scale of use
- 300000
Abstract
- Dataset description abstract
-
Bathymetry based on data recorded during M72-3 between 17.03.2007 and 23.04.2007 in the Black Sea. This cruise concentrated on interdisciplinary work on gas hydrates with a main focus on the gas hydrate transition zone in and below 750 m water depth. Main working areas were the Sorokin Trough, an area south of the Kerch Strait and the Andrusov Ridge in Ukrainian waters and the Gudauta Ridge and Gurian Trough in Georgian waters.
CI Citation: Paul Wintersteller ( seafloor-imaging@marum.de ): Responsible party for bathymetry post-processing and author of the product.
- Description of processed data sources
-
Description of processed data sources :
During the cruise M72-3 the Kongsberg EM120 multi-beam echo-sounder was used. The EM120 uses a nominal sounding frequency of 12 kHz. 191 beams with a 1°/2° footprint are formed for each ping while the seafloor is detected using amplitude and phase information for each beam sounding. For further information consult https://epic.awi.de/26725/1/Kon2007a.pdf .
The EM120 multi-beam was used continuously during M72-3. The vessel’s speed was 8 kn during
Surveys while the opening-angle was set to 140°. On transits with speeds up to 12 kn the EM120 was running with bad data quality especially for the outer beams. Responsible person during this cruise / PI: Markus Brüning ( info@pk-engineers.de ).
- Description of data processing
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Description of data processing :
Postprocessing and products were conducted by the Seafloor-Imaging group of MARUM, responsible person: Paul Wintersteller ( seafloor-imaging@marum.de ). The open source software MB-system (Caress, D.W., and D.N. Chayes, MB-System Version 5, Open source software distributed from the MBARI and L-DEO web sites, 2000-2012.) was utilized for this purpose. A tide correction was applied, based on the Oregon State University (OSU) tidal prediction software (OTPS) that is retrievable through MB-System. In general, there is a tide differences of less than 20 cm in the Black Sea. Though CTD measurements were taken during the M72-3 cruise, these were not sufficient to represent the changes in the SVP profile throughout the study area, therefore a SVP correction had to be applied. The corrections of sound velocity is based on various SVP/CTD measurements throughout different cruises in the Black Sea within the last 15-20 years. In addition, the NATO Black Sea data base ( http://sfp1.ims.metu.edu.tr/ODBMSDB/ODBMSDB.dll/querydb) was consulted for further CTD profiles in the given season/period of the year and in close position to the data set. The CTD data has then been used to calculate SVP by the usage of the UNESCO formula (G.S.K. Wong and S Zhu, Speed of sound in seawater as a function of salinity, temperature and pressure (1995) J. Acoust. Soc. Am. 97(3) pp 1732-1736). The changes in SVP were applied with the mbset function within mbsystem. Due to a negative offset within the data set a positive draft correction of 10 m had to be applied with mbset while further roll, pitch, and heave corrections were not necessary for the M72-3 data. Bathymetric data has been manually cleaned for existing artefacts with mbeditviz. NetCDF (GMT) grids of the product and the statistics were created using mbgrid. Quality assurance was furthermore proven by visual and statistical comparison of crossing survey-lines from different cruises throughout the Black Sea. No total propagated uncertainty (TPU) has been calculated to gather vertical or horizontal accuracy.
The currently published bathymetric grid of the cruise has a resolution of 125 m. A higher resolution is, at least partly, achievable.
- Processing software
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MB-System
Where
- Min. depth in meters (>0 below Sea Level)
- 61
- Max. depth in meters (>0 below Sea Level)
- 3049
Projection
- code
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WGS 84 (EPSG:4326)
- Version or custom projection details
-
7.4
When
Creation date
Revision date
Temporal extent*
- Begin
- 2007-03-17T00:00:00
- End
- 2007-04-23T00:00:00
Who
Originator
- Organisation name
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MARUM (Prof. Gerhard Bohrmann)
Data Holding Center
- Organisation name
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MARUM
Collating Centre = Metadata author
- Organisation name
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MARUM
Access
Distributor
- Organisation name
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PANGAEA
Data formats*
- Format
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ESRI ASCII, NetCDF GMT, ASCII XYZ
- Version
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Not stated
- OnLine resource
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Protocol Linkage Name WWW:LINK
https://doi.pangaea.de/10.1594/PANGAEA.860094 PANGAEA
Intellectual property
- Access constraints
- License
- Use constraints
- Copyright
- Other constraints
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Artemov, Yuriy G; Brüning, Markus; Nikolovska, Aneta; Althoff, Sarah; Klaucke, Ingo (2013): Swath sonar multibeam EM-120 bathymetry during METEOR cruise M72/3 with links to raw data files. MARUM - Center for Marine Environmental Sciences, Universität Bremen, doi:10.1594/PANGAEA.816229
- Other constraints
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Seifert, Richard; Boetius, Antje; Bohrmann, Gerhard; Bialas, Jörg; Borowski, Christian (2011): Biogeochemistry, Microbiology, Marine Fluids, Gas Hydrates and Regional Palaeo-Climate of the Black Sea - Cruise No. 72, February 7 - June 4, 2007, Istanbul (Turkey) - Trabzon - Istanbul (Turkey). METEOR-Berichte, Leitstelle Meteor, Institut für Meereskunde der Universität Hamburg, 12-1, 240 pp, doi:10.2312/cr_m72 *
https://www.tib.eu/de/suchen/id/awi%3Adoi~10.2312%252Fcr_m72/