https://doi.pangaea.de/10.1594/PANGAEA.995741Bussmann, IngeborgIngeborgBussmann0000-0002-1197-7461Alfred Wegener Institute - Biological Institute HelgolandPANGAEA2026diffusive fluxdissolved methane concentrationk600methane saturationMOSESDATE/TIMELATITUDELONGITUDEMethane, dissolvedMethane, flux, diffusiveMethane, dissolved, gas transfer velocityMethane, dissolved, equilibriumMethane saturationUltraportable Greenhouse Gas Analyzer (UGGA), Los Gatos Research Inc., U-GGA-915-0011-0000-0000 (#3599)FerryBox systemMOSES_2023_Elbe-NorthSea_Marine_MYAMya IIModular Observation Solutions for Earth Systems (MOSES)2023-07-06T07:20:00/2023-07-07T11:39:00Dataset10.5194/egusphere-2025-485010.1029/1999GB90009110.1029/2012GB00430610.4319/lom.2014.12.35110.1146/annurev.marine.010908.1637422182 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalIn July 2023 a cruise with RV Mya_II took place to investigate if the dredging of sand off Sylt influences the atmospheric and dissolved methane concentrations. With the ship's system water temperature and salinity was recoreded, as well as the wind speed. Atmospheric concentrations were measured with a LICOR trace gas analyzer. Dissolved methane was determined via a degassing system connected to a greenhouse gas analyzer as online measurements. Theses relative concentrations were converted to concentrations with water samples analyzed with gas chromatography.8.1444548.46479454.8874455.059656