Methane dry air mole fractions measured in the Swiss container during MOSAiC 2019/2020 ...

• Main Authors: Angot, Hélène, Beck, Ivo, Jokinen, Tuija, Laurila, Tiia, Quéléver, Lauriane, Schmale, Julia
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: central Arctic Ocean; methane concentrations; MOSAiC20192020; MOSAiC_ATMOS; Polarstern; DATE/TIME; LATITUDE; LONGITUDE; Event label; Methane, dry-air mole fraction; Flag, pollution; Trace gas monitor; Cavity ring down spectrometer, G2401, Picarro Inc.; PS122/1; PS122/2; PS122/3; PS122/4; PS122/5; Multidisciplinary drifting Observatory for the Study of Arctic Climate MOSAiC; Arctic; Arctic Ocean; Beck
• Online Access: https://dx.doi.org/10.1594/pangaea.944258; https://doi.pangaea.de/10.1594/PANGAEA.944258

This dataset contains minute-averaged methane dry air mole fractions measured during the year-long Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition from October 2019 to September 2020. The measurements were performed in the Swiss container on the D-deck of Research Vessel Polarstern. Data were collected by cavity ring-down spectroscopy using a commercial Picarro instrument (model G2401). The minute-averaged dry air mole fractions were adjusted after cross-evaluation against discrete whole air samples collected for post-cruise analysis at the National Oceanic and Atmospheric Administration (NOAA) Global Monitoring Laboratory. Pollution spikes due to local anthropogenic pollution sources (e.g., exhaust by the vessel's engine and vents, skidoos, helicopters, on-ice diesel generators) were identified and flagged as follows. For each data point, the gradient (time derivative) was calculated (Beck et al., 2022). Data points corresponding to an abnormally high gradient ... : We used 1 sec time resolution positional data from the following datasets: PS122/1: Rex, M (2020), PS122/2: Haas, C (2020), PS122/3: Kanzow, T (2020), PS122/4: Rex, M (2021a), PS122/5: Rex, M (2021b) ...