Citation:

PANGAEA.923992

Name: Surface and water column methane (CH4) distribution and sea-to-air flux during ALKOR cruise AL510
Published: 2020-10-21
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Baltic Sea; CH4; gas exchange; Methane

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Abstract:

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.

Keyword(s):

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

Coverage:

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

Event(s):

AL510_9-1 * Latitude: 54.578790 * Longitude: 10.106950 * Date/Time: 2018-06-03T15:04:00 * Elevation: -25.0 m * Location: Baltic Sea * Campaign: * Basis: * Method/Device: (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: * Basis: * Method/Device: (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: * Basis: * Method/Device: (CTD-RO)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Booge, Dennis
2	DATE/TIME	Date/Time		Booge, Dennis		Geocode
3	Latitude of event	Latitude		Booge, Dennis
4	Longitude of event	Longitude		Booge, Dennis
5	Depth, bathymetric	Bathy depth	m	Booge, Dennis
6	Bottle number	Bottle		Booge, Dennis
7	Sample code/label	Sample label		Booge, Dennis
8	Depth, description	Depth desc		Booge, Dennis		planned
9	Depth, uncorrected	Depth uncorr	m	Booge, Dennis		planned
10	DEPTH, water	Depth water	m	Booge, Dennis		Geocode
11	Pressure, water	Press	dbar	Booge, Dennis	CTD
12	Temperature, water	Temp	°C	Booge, Dennis	CTD
13	Salinity	Sal		Booge, Dennis	CTD
14	Oxygen	O2	µmol/kg	Booge, Dennis	CTD
15	Density, potential	Dens pot	kg/m³	Booge, Dennis	CTD
16	Density, mass density	Density	kg/m³	Booge, Dennis	CTD
17	Methane	CH4	nmol/l	Gindorf, Sonja	Purge and trap gas chromatography	Triplicate 1
18	Methane	CH4	nmol/l	Gindorf, Sonja	Purge and trap gas chromatography	Triplicate 2
19	Methane	CH4	nmol/l	Gindorf, Sonja	Purge and trap gas chromatography	Triplicate 3
20	Methane	CH4	nmol/l	Gindorf, Sonja		mean
21	Error	Error		Gindorf, Sonja		methane, STD DEV [nmol L-1]
22	Error	Error		Gindorf, Sonja		methane, STD DEV [%]

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

3327 data points

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