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Inventur der Heincke-Reise HE413 (DOD-Ref-No.20140147)
Inventory of Heincke Cruise HE413 (DOD-Ref-No.20140147)
Plattform Platform |
Reise-Nr. Cruise-No. |
Zeitraum Period |
Projekt Project |
Arbeitsgebiet Working area |
---|---|---|---|---|
Heincke | HE413 | 13.01.2014 - 19.01.2014 | North Sea |
Fahrtleiter Chief Scientist | Institut Institute | Auslaufhafen Port of departure | Einlaufhafen Port of return | Stationskarte Station map | Schiffsroute Trackchart |
---|---|---|---|---|---|
Romer Miriam | Universitat Bremen, Zentrum fur Marine Umweltwissenschaften | Bremerhaven | Bremerhaven |
Ziel der Reise / Objectives of Cruise:
The cruise aimed to map the distribution of gas emissions to the water column and investigate seepage related processes in the study area. Since the study area is located in shallow water <50 m, gas bubble emissions to the water column are also a potential source to atmospheric methane concentrations. We planned to employ a wide array of ship- and AUV-borne acoustic and optical methods to map the seafloor, seepage related features, and bubble emissions. A novel AUV for automatic bubble detection and sampling should be tested and calibrated during the cruise. This tool will allow for efficient, unsupervised seepage detection and sampling within large areas in future. The cruise should contribute to a better understanding of seepage distributions and processes in the study area in the southern North Sea. The cruise started in Bremerhaven on Monday, 13 of January, and after a transit of ~20 hours to the working area in the Netherlands sector B13, the station work began Tuesday morning, 14 of January. In total, 35 stations were conducted during the five working days until Saturday, 18 of January. Seafloor, subbottom and water column mapping using ship-mounted hydroacoustic systems were performed during 14 surveys, which were mainly done during night times. The AUV was deployed three times, whereas with each dive a different sonar or video system (multibeam, sidescan sonar and imaging sonar) was mounted for testing. A transect of nine stations in E-W direction over the main gas seep area was sampled with CTD deployments. The water samples taken were analyzed for their composition of light hydrocarbons and microbial methane consumption. In addition, an underwater mass spectrometer (UWMS) was deployed twice at the main cluster of gas flares to analyze the methane concentration in different water depth over the entire seep area. After leaving the working area and a transit of more than 26 hours against the waves, we arrived in Bremerhaven on Sunday afternoon, 19 of January. The cruise was planned to last until Wednesday, 22 of January, but had to be cancelled earlier due to an upcoming storm prohibiting further deployments or useful mapping. However, during the five days in the working area several calm periods and waves of maximum 3.5 meters height allowed for the deployments of our large equipment and good hydroacoustic data during mapping. Therefore, the entire planned program could be realized within these five days. In summary, the cruise was very successful and many data of high quality was collected, which will be analyzed subsequently.
Messungen / Measurements
Institut Institute |
Wissenschaftler Scientist |
Anzahl Number |
Einheit Unit |
Typ der Messungen Type of measurements |
Kommentar Comments |
Daten im DOD Data in DOD |
---|---|---|---|---|---|---|
MARUM | Korber Jan-Hendrik | 3 | diving(s) | G72 Geophysical measurements made at depth (below near surface and above seafloor) |
AUV dives with different sonar systems mounted. | no |
MARUM | Romer Miriam | 14 | survey | G74 Multi-beam echosounding |
. | no |
MARUM | Mau Susan | 14 | deployment | H10 CTD-Stations |
. | no |
AWI | Gentz Torben | 2 | deployment | H33 Other dissolved gases |
Measurements of dissolved methane concentrations in the water column using the underwater mass spectrometer towed from the vessel. | no |