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Gindorf, Sonja; Booge, Dennis; Kock, Annette; Bange, Hermann Werner; Marandino, Christa A (2020): Surface and water column methane (CH4) distribution and sea-to-air flux during ALKOR cruise AL516. PANGAEA,

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We developed a purge-and-trap system to measure CH_4 with high accuracy in the surface water and the water column of the Kiel Bight, close to the monthly time series station Boknis Eck. The small-scale variability of CH_4 was investigated from samples taken in the Baltic Sea during the two Alkor cruises AL510 and AL516 in the in early summer and autumn 2018 when two gas exchange experiments (GasEx) were carried out around the Boknis Eck time series station. This station has been sampled for CH_4 on a monthly basis since 2007.During the GasEx cruises, special emphasis was put on the sampling of the upper water column and the mixed layer, with high-resolution sampling to determine potential gas gradients within the mixed layer that are not captured with conventional sampling approaches. Water column CH_4 samples were collected from Niskin bottles mounted to a CTD-water-rosette-sampler, Dinghy samples were collected using an aquarium pump, Underway samples were taken from the ship's sea water supply. All samples were filled bubble-free into dark brown 20 mL glass vials by overflowing the approximate threefold volume and crimp-sealed with rubber stoppers and aluminium caps.
Baltic Sea; CH4; gas exchange; Methane
Related to:
Gindorf, Sonja (2020): Development of a Purge + Trap System for the Quantification of Methane Variability in the Baltic Sea. Master Thesis. Kiel University, Faculty of Agricultural and Nutritional Sciences, Faculty of Mathematics and Natural Sciences. GEOMAR - Helmholtz Centre for Ocean Research Kiel, Marine Biogeochemistry Unit Chemical Oceanography
Median Latitude: 54.551326 * Median Longitude: 10.082642 * South-bound Latitude: 54.488085 * West-bound Longitude: 10.018897 * North-bound Latitude: 54.726140 * East-bound Longitude: 10.255232
Date/Time Start: 2018-09-13T00:00:00 * Date/Time End: 2018-09-22T00:00:00
Minimum DEPTH, water: 0.1 m * Maximum DEPTH, water: 26.1 m
AL516_22-1 * Latitude: 54.581000 * Longitude: 10.104000 * Date/Time: 2018-09-13T10:17:29 * Elevation: -26.0 m * Location: Baltic Sea * Campaign: AL516 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
AL516_23-1 * Latitude: 54.581000 * Longitude: 10.104000 * Date/Time: 2018-09-13T14:57:01 * Elevation: -26.2 m * Location: Baltic Sea * Campaign: AL516 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO) * Comment: geschleppt , Gas Injektion
AL516_25-1 * Latitude: 54.545000 * Longitude: 10.055000 * Date/Time: 2018-09-14T10:04:51 * Elevation: -22.0 m * Location: Baltic Sea * Campaign: AL516 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventBooge, Dennis
2Station labelStationBooge, Dennis
3Bottle numberBottleBooge, Dennis
4Sample code/labelSample labelBooge, Dennis
5DATE/TIMEDate/TimeBooge, DennisGeocode
6LATITUDELatitudeBooge, DennisGeocode
7LONGITUDELongitudeBooge, DennisGeocode
8DEPTH, waterDepth watermBooge, DennisGeocode
9Pressure, waterPressdbarBooge, DennisCTD
10Temperature, waterTemp°CBooge, DennisCTD
11SalinitySalBooge, DennisCTD
12OxygenO2µmol/lBooge, DennisCTD
13MethaneCH4nmol/lGindorf, SonjaPurge and trap gas chromatographyTriplicate 1
14MethaneCH4nmol/lGindorf, SonjaPurge and trap gas chromatographyTriplicate 2
15MethaneCH4nmol/lGindorf, SonjaPurge and trap gas chromatographyTriplicate 3
16MethaneCH4nmol/lGindorf, Sonjamean
17ErrorErrorGindorf, Sonjamethane, STD DEV [nmol L-1]
18ErrorErrorGindorf, Sonjamethane, STD DEV [%]
2051 data points

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