Weiß, Tim; Schmidt, Mark; Haeckel, Matthias (2025): Atmospheric methane and carbon dioxide concentrations measured during ALKOR cruise AL575 on 2022-06-29 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.982666, In: Weiß, T et al. (2025): Atmospheric methane and carbon dioxide concentrations measured during ALKOR cruise AL575, 29 June 2022 – 12 July 2022, Kiel – Kiel [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.982665
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Published: 2025-08-18 • DOI registered: 2025-09-16
Abstract:
Atmospheric carbon dioxide (CO2) and methane (CH4) concentrations were monitored during AL575 cruise on 2022-06-29 using a cavity ring down spectrometer (Picarro G2301-f CRDS) and GEOMARs 'Atmospheric Intake System' (AIS). The Picarro/AIS system was installed in the wet laboratory (starboard, main deck) of RV ALKOR and was connected by an aluminium tube to an air inlet nozzle placed at the bow of RV ALKOR. The air was pumped via the AIS intake tube with a flow rate of 2.67 litre per minute to the Picarro analyser. The atmospheric CH4, CO2, and water vapour concentrations were determined in real time at 2-3 Hz sampling rate. A time offset of 87 seconds between the air intake nozzle at the bow (6 m above sea surface) and the actual gas measurement at the Picarro was determined and the calculated flow rate considered, when correlating the gas data with navigation and weather data provided by the WERUM dship repository (https://dship.geomar.de). The weather data is published separately at doi:10.1594/PANGAEA.983833 .
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):
Funding:
Federal Ministry of Education and Research (BMBF), grant/award no. 03F0893A: DAM CDRmare - GEOSTOR, GEOMAR
Coverage:
Median Latitude: 54.272223 * Median Longitude: 9.392938 * South-bound Latitude: 53.840908 * West-bound Longitude: 7.001107 * North-bound Latitude: 54.702636 * East-bound Longitude: 10.849801
Date/Time Start: 2022-06-29T00:00:00 * Date/Time End: 2022-06-29T23:59:57
Minimum ALTITUDE: 6 m * Maximum ALTITUDE: 6 m
Event(s):
AL575_0_Underway-5 * Latitude Start: 54.702636 * Longitude Start: 10.849801 * Latitude End: 54.328615 * Longitude End: 10.178766 * Date/Time Start: 2022-06-29T00:00:00 * Date/Time End: 2022-07-12T19:00:28 * Campaign: AL575 (GEOSTOR leak) * Basis: Alkor (1990) * Method/Device: Ship Weather Station (SWEAS)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Weiß, Tim | Geocode | ||
| 2 | ALTITUDE | Altitude | m | Weiß, Tim | Geocode | |
| 3 | Methane, dry air | CH4 air | ppmv | Weiß, Tim | Cavity ring down spectrometer (CRDS) , Picarro Inc., G2301-f | |
| 4 | Carbon dioxide, dry air | CO2 air | ppmv | Weiß, Tim | Cavity ring down spectrometer (CRDS) , Picarro Inc., G2301-f | |
| 5 | Water vapour content | WVC | ppmv | Weiß, Tim | Cavity ring down spectrometer (CRDS) , Picarro Inc., G2301-f | |
| 6 | LATITUDE | Latitude | Weiß, Tim | Geocode | ||
| 7 | LONGITUDE | Longitude | Weiß, Tim | Geocode | ||
| 8 | Heading | Head | deg | Weiß, Tim | ||
| 9 | Speed over ground | SOG | kn | Weiß, Tim | ||
| 10 | Course over ground | Course ov gr | deg | Weiß, Tim |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1177548 data points
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