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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 AL510. 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: 54.613037 * Median Longitude: 10.125182 * South-bound Latitude: 54.520320 * West-bound Longitude: 10.072360 * North-bound Latitude: 54.707520 * East-bound Longitude: 10.204650
Date/Time Start: 2018-06-03T15:07:27 * Date/Time End: 2018-06-15T04:10:15
Minimum DEPTH, water: 0.6 m * Maximum DEPTH, water: 22.3 m
AL510_9-1 * Latitude: 54.578790 * Longitude: 10.106950 * Date/Time: 2018-06-03T15:04:00 * Elevation: -25.0 m * Location: Baltic Sea * Campaign: AL510 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
AL510_27-1 * Latitude: 54.583760 * Longitude: 10.104460 * Date/Time: 2018-06-04T11:28:00 * Elevation: -25.0 m * Location: Baltic Sea * Campaign: AL510 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
AL510_29-1 * Latitude: 54.535210 * Longitude: 10.096300 * Date/Time: 2018-06-05T04:08:00 * Elevation: -23.0 m * Location: Baltic Sea * Campaign: AL510 * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventBooge, Dennis
2DATE/TIMEDate/TimeBooge, DennisGeocode
3Latitude of eventLatitudeBooge, Dennis
4Longitude of eventLongitudeBooge, Dennis
5Depth, bathymetricBathy depthmBooge, Dennis
6Bottle numberBottleBooge, Dennis
7Sample code/labelSample labelBooge, Dennis
8Depth, descriptionDepth descBooge, Dennisplanned
9Depth, uncorrectedDepth uncorrmBooge, Dennisplanned
10DEPTH, waterDepth watermBooge, DennisGeocode
11Pressure, waterPressdbarBooge, DennisCTD
12Temperature, waterTemp°CBooge, DennisCTD
13SalinitySalBooge, DennisCTD
14OxygenO2µmol/kgBooge, DennisCTD
15Density, potentialDens potkg/m3Booge, DennisCTD
16Density, mass densityDensitykg/m3Booge, DennisCTD
17MethaneCH4nmol/lGindorf, SonjaPurge and trap gas chromatographyTriplicate 1
18MethaneCH4nmol/lGindorf, SonjaPurge and trap gas chromatographyTriplicate 2
19MethaneCH4nmol/lGindorf, SonjaPurge and trap gas chromatographyTriplicate 3
20MethaneCH4nmol/lGindorf, Sonjamean
21ErrorErrorGindorf, Sonjamethane, STD DEV [nmol L-1]
22ErrorErrorGindorf, Sonjamethane, STD DEV [%]
3327 data points

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