Sellmaier, Amanda; Damm, Ellen; Sachs, Torsten; Pätzold, Falk; Nomura, Daiki; Rex, Markus (2025): Ship-borne atmospheric methane measurements during MOSAiC Leg 4-5 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.984843
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Published: 2025-11-17 • DOI registered: 2025-11-17
Abstract:
This dataset contains minute-averaged CH4 concentrations and its isotopic composition (δ13C-CH4) in air above the Arctic Ocean measured during Leg 4 (4 June 2020 – 12 August 2020) and Leg 5 (12 August 2020 – 12 October 2020) of the MOSAiC expedition. The continuous ship-borne measurements were recorded by Cavity Ring-Down Spectroscopy (CRDS) using a Picarro G2132-i isotope analyser (Picarro, Inc., Santa Clara, USA). Air was drawn in from the starboard side of compass deck of RV Polarstern at about 21 m above the sea-ice and ocean surface using a Teflon tube with a length of 75 m and an inside diameter of 4.5 mm. A flow rate of 2.4 l min−1 was generated with a 3KQ Diaphragma pump (Boxer, Ottobeuren, Germany). The Picarro G2132-i isotope analyser then continuously measured in the "High Precision" mode with 1 Hz temporal resolution. To identify and flag local pollution in the data sets, the Pollution Detection Algorithm (PDA) developed by Beck et al. (2022) was applied to the raw concentration data. The PDA employs a five-step statistical filter to detect and flag contaminated measurement points, which were subsequently removed from the concentration and isotopy data. Using this approach, 17.3 % of the raw data were identified as polluted and removed from the time series. The data columns include the Date and Time in Coordinated Universal Time (UTC), the latitude and longitude of the Research Vessel Polarstern, the methane concentration in ppm and the isotopic composition of CH4 (δ13C-CH4) in ‰.
Supplement to:
Sellmaier, Amanda; Damm, Ellen; Sachs, Torsten; Kirbus, Benjamin; Wiekenkamp, Inge; Rinke, Annette; Pätzold, Falk; Nomura, Daiki; Lampert, Astrid; Rex, Markus (preprint): New insights in atmospheric methane variability in the Arctic by ship-borne measurements during MOSAiC. https://doi.org/10.5194/egusphere-2025-3778
References:
Beck, Ivo; Angot, Hélène; Baccarini, Andrea; Dada, Lubna; Quéléver, Lauriane; Jokinen, Tuija; Laurila, Tiia; Lampimäki, Markus; Bukowiecki, Nicolas; Boyer, Matthew; Gong, Xianda; Gysel-Beer, Martin; Petäjä, Tuukka; Wang, Jian; Schmale, Julia (2022): Automated identification of local contamination in remote atmospheric composition time series. Atmospheric Measurement Techniques, 15(14), 4195-4224, https://doi.org/10.5194/amt-15-4195-2022
Project(s):
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AFMOSAiC-1_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS122_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate / MOSAiC
Coverage:
Median Latitude: 83.319434 * Median Longitude: 34.348630 * South-bound Latitude: 69.455700 * West-bound Longitude: -171.523900 * North-bound Latitude: 89.999900 * East-bound Longitude: 170.841100
Date/Time Start: 2020-06-07T23:42:00 * Date/Time End: 2020-10-07T10:04:00
Minimum Elevation: -3131.5 m * Maximum Elevation: -57.7 m
Event(s):
PS122/4_43-12 * Latitude Start: 78.236391 * Longitude Start: 15.618997 * Latitude End: 81.486037 * Longitude End: 2.219117 * Date/Time Start: 2020-06-07T21:00:00 * Date/Time End: 2020-07-10T17:35:00 * Elevation Start: -57.7 m * Elevation End: -1135.5 m * O2A Registry URI: https://registry.o2a-data.de/items/4057 * Location: Arctic Ocean * Campaign: PS122/4 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Cavity ring-down spectroscopy (CRDS) * Comment: "For Leg 4 this device is located in dry lab 4 and connected to outside air. The outisde air is obtained at P-deck, tubed down and then shared with the halo-carbon analyser. This device is switched to outside air while no other air samples are analysed, so this is an interupted time series; Rec started right after leaving 12NM zone of Svalbard "
PS122/4_43-79 * Latitude Start: 81.484249 * Longitude Start: 2.188053 * Latitude End: 81.414407 * Longitude End: 0.289991 * Date/Time Start: 2020-07-10T18:25:00 * Date/Time End: 2020-07-13T13:00:00 * Elevation Start: -1143.2 m * Elevation End: -2137.7 m * O2A Registry URI: https://registry.o2a-data.de/items/4057 * Location: Arctic Ocean * Campaign: PS122/4 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Cavity ring-down spectroscopy (CRDS) * Comment: For Leg 4 this device is located in dry lab 4 and connected to outside air. The outisde air is obtained at P-deck, tubed down and then shared with the halo-carbon analyser. This device is switched to outside air while no other air samples are analysed, so this is an interupted time series.
PS122/4_43-99 * Latitude Start: 81.414001 * Longitude Start: 0.287395 * Latitude End: 81.295844 * Longitude End: 0.316205 * Date/Time Start: 2020-07-13T13:20:00 * Date/Time End: 2020-07-15T13:05:00 * Elevation Start: -2137.3 m * Elevation End: -2384.4 m * O2A Registry URI: https://registry.o2a-data.de/items/4057 * Location: Arctic Ocean * Campaign: PS122/4 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Cavity ring-down spectroscopy (CRDS) * Comment: For Leg 4 this device is located in dry lab 4 and connected to outside air. The outisde air is obtained at P-deck, tubed down and then shared with the halo-carbon analyser. This device is switched to outside air while no other air samples are analysed, so this is an interrupted time series.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Sellmaier, Amanda | Geocode | ||
| 2 | LATITUDE | Latitude | Sellmaier, Amanda | Geocode | ||
| 3 | LONGITUDE | Longitude | Sellmaier, Amanda | Geocode | ||
| 4 | Methane | CH4 | ppmv | Sellmaier, Amanda | Cavity Ring-Down Spectrometer (CRDS), PICARRO, G2132-i | |
| 5 | δ13C, methane | δ13C CH4 | ‰ PDB | Sellmaier, Amanda | Cavity Ring-Down Spectrometer (CRDS), PICARRO, G2132-i |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
284195 data points
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