Description: As part of the MOSES Project, in April 2023 methane measurements were started in the north-western part of the island Heligoland in the German Bight (North Sea). The objective was to complement the measurements of the Sternfahrten to identify the carbon cycle and its flow from the start of the Elbe river into the North Sea. Therefore, a Contros methane sensor for dissolved methane was deployed under water at about 10 to 12 meter depth (depending on the tide) close to the underwater observatory (UW-OBS) MarGate (54°11' N, 7°52' E), from the COSYNA Project. To ensure correct values latter was cleaned frequently from growing organisms by scientific divers. The present data contains the data from 2024, the second year running the sensors. Based on the concentrations of dissolved methane the methane emissions (diffusive flux) was calculated.
Global identifier:
Doi(
"10.1594/PANGAEA.992632",
)
DataMeasurements(
DataMeasurements {
domain: Unspecified,
station: None,
measured_variables: [
"DATE/TIME",
"DEPTH, water",
"Gas transfer velocity",
"LATITUDE",
"LONGITUDE",
"Methane saturation",
"Methane, dissolved",
"Methane, flux, diffusive",
],
methods: [
"Calculated according to Wanninkhof et al., 2009 and Nightingale et al., 2000",
"Methane sensor, 4H-JENA engineering GmbH, CONTROS HydroC® CH₄",
],
},
)
Comment: The solubility of methane was calculated with data on temperature and salinity of the MarGate field in 2024 according to the manufactures specifications (based on Guinasso et al., 1979) For the flux calculation: Data on wind and atmospheric methane concentration were used from the ICOS station Helgoland Since the MarGate field is protected by the island in case of wind from the west, the following correction was made: Wind from the direction between 140 and 240° was multiplied by 0.5, wind from the direction between 241° and 280° was multiplied by 0.7 These parameters were then used to calculate the diffusive flux for 2024 using Nightingale's formula The sensor had been calibrated during the exposure time and the sensor drift of 0.001 ppm/d was applied to the data set.
Tags: Methangehalt ? Methanemission ? Durchflussmessung ? Sensor ? Elbe ? Helgoland ? Geografische Koordinaten ? Methan ? Insel ? Kohlenstoffkreislauf ? Meeresgewässer ? Wasser ? Deutsche Bucht ? In-situ-Daten ? Daten ? Gezeiten ? Treibhausgas ? Nordsee ? MOSES ? MarGate underwater experimental area ? Methane diffusive flux ? Underwater observatory ?
Region: Helgoland, North Sea
Bounding boxes: 7.866699999999024° .. 7.866699999999024° x 54.1832999999904° .. 54.1832999999904°
License: Creative Commons Namensnennung 4.0
Language: Englisch/English
Issued: 2026-03-06
Modified: 2026-03-06
Time ranges: 2024-01-01 - 2024-12-31
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