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Schumacher, Mia; Haeckel, Matthias; Schmidt, Mark (2025): Sediment echosounder raw data (Innomar SES-2000 entire dataset) of RV ALKOR during cruise AL575 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.977814

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Published: 2025-03-05 • DOI registered: 2025-04-09

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Abstract:
Raw sub-bottom data were collected aboard RV ALKOR during cruise AL575 using a SES2000 parametric subbottom profiler system by Innomar, operating at a combination of three frequencies, 5, 10 and 15 kHz. It may penetrate the seafloor down to around 40m, depending on substrate and amongst others reveal submerged gas cavities that can potentially rise and enter the water column as bubble streams. The Seswin v 1.7.7. acquisition software was used to record .raw & .ses data with following settings:
Low Frequency 6-8 kHz (depending on depth)
Low Frequency Pulse length 1-2/s
Depth Range Water depth + 12m
Gain Low F: 15dB, High F: 4dB
The expedition took place during 2022-06-28 – 2022-07-13 from Kiel to Kiel (Germany) in the North Sea. The major aim of AL575 - GEOSTOR leak are to investigate and contribute to the assessment of the mechanisms and potential risks of CO2 leakage along boreholes drilled through the sedimentary overburden above subseafloor storage formations in the North Sea. Data were recorded in the EEZs of UK and Germany. Please see the cruise report for details. The data are unprocessed and can therefore contain incorrect measurements (artifacts) if not further processed. Note that refraction errors may occur when no proper SVP is applied. Data acquisition and provision was done by GEOMAR and they are published according to the FAIR principles.
Related to:
Haeckel, Matthias; Schmidt, Mark (2024): Assessing the risk of greenhouse gas emissions from abandoned wells, Cruise No. AL575, 27 JUNE 2022 - 13 JULY 2022, Kiel - Kiel, GEOSTOR leak. Alkor-Berichte, GEOMAR Helmholtz Centre for Ocean Research Kiel, AL575, 33 pp, https://doi.org/10.3289/CR_AL575
Project(s):
DAM CDRmare - GEOSTOR: Submarine Carbon Dioxide Storage in Geological Formations of the German North Sea (GEOSTOR)
Research Mission of the German Marine Research Alliance (DAM): Marine carbon sinks in decarbonisation pathways (CDRmare)
Funding:
Federal Ministry of Education and Research (BMBF), grant/award no. 03F0893A: DAM CDRmare - GEOSTOR, GEOMAR
Coverage:
Median Latitude: 57.339870 * Median Longitude: 1.622015 * South-bound Latitude: 56.972311 * West-bound Longitude: 1.030492 * North-bound Latitude: 57.707429 * East-bound Longitude: 2.213538
Date/Time Start: 2022-06-30T22:32:02 * Date/Time End: 2022-07-08T02:48:23
Event(s):
AL575_0_Underway-3 * Latitude Start: 56.972311 * Longitude Start: 2.213538 * Latitude End: 57.707429 * Longitude End: 1.030492 * Date/Time Start: 2022-06-30T22:32:02 * Date/Time End: 2022-07-08T02:48:23 * Campaign: AL575 (GEOSTOR leak) * Basis: Alkor (1990) * Method/Device: Sub-bottom profiler, SES-2000, Innomar
Comment:
Do not use for navigation nor exploitation.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Binary ObjectBinarySchumacher, Mia
2 Binary Object (Media Type)Binary (Type)Schumacher, Mia
3 Binary Object (File Size)Binary (Size)BytesSchumacher, Mia
4 File contentContentSchumacher, Mia
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 1 (ProcLevel1)
Size:
126 data points

Data

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Binary		2 
Binary (Type)		3 
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Content
AL574-NorthSeaUK_20220630223202.rawapplication/octet-stream186.3 MBytesRaw data file
AL574-NorthSeaUK_20220630223202.sesapplication/octet-stream81.5 MBytesEnvelope data file
AL574-NorthSeaUK_20220701000000.rawapplication/octet-stream228.4 MBytesRaw data file
AL574-NorthSeaUK_20220701000000.sesapplication/octet-stream100 MBytesEnvelope data file
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AL574-NorthSeaUK_20220701014703.sesapplication/octet-stream100 MBytesEnvelope data file
AL574-NorthSeaUK_20220701033509.rawapplication/octet-stream113.9 MBytesRaw data file
AL574-NorthSeaUK_20220701033509.sesapplication/octet-stream49.9 MBytesEnvelope data file
AL574-NorthSeaUK_20220701222456.rawapplication/octet-stream789.6 kBytesRaw data file
AL574-NorthSeaUK_20220701222456.sesapplication/octet-stream213 kBytesEnvelope data file
AL574-NorthSeaUK_20220701222517.rawapplication/octet-stream126.4 kBytesRaw data file
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AL575-NorthSeaUK_20220703000000.rawapplication/octet-stream228.4 MBytesEnvelope data file
AL575-NorthSeaUK_20220703000000.sesapplication/octet-stream100 MBytesRaw data file
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AL575-NorthSeaUK_20220703160904.sesapplication/octet-stream100 MBytesRaw data file
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AL575-NorthSeaUK_20220704120000.sesapplication/octet-stream100 MBytesRaw data file
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