Deutsches Ozeanographisches
Datenzentrum Inventur der Poseidon-Reise POS498 (DOD-Ref-No.20160082)
Inventory of Poseidon Cruise POS498 (DOD-Ref-No.20160082)

Plattform
Platform
Reise-Nr.
Cruise-No.
Zeitraum
Period
Projekt
Project
Arbeitsgebiet
Working area
Poseidon POS498 18.04.2016 - 01.05.2016   Mediterranean Sea, Eastern Basin  

Fahrtleiter
Chief Scientist
Institut
Institute
Auslaufhafen
Port of departure
Einlaufhafen
Port of return
Stationskarte
Station map
Schiffsroute
Trackchart
Sahling H. Universitat Bremen, Zentrum fur Marine Umweltwissenschaften Izmir Catania   

Ziel der Reise / Objectives of Cruise:

During R/V POSEIDON Cruise POS498 two observatories were recovered from the seafloor with the help of the Remotely Operated Vehicle (ROV) MARUM-SQUID. The observatories were deployed during the R/V MARIA S. MERIAN Cruise MSM 35T on 8 February 2014 at Athina Mud Volcano to monitor the activity in terms of fluid flow and mud volcanic eruptions. Athina Mud Volcano is located at ~1800 m water depth in the Anaximander Mountains. One observatory recorded the temperature in the sediments (T-lance). The other observatory recorded the pore pressure at ~2 m sediment depth (P-lance). The P-lance was also equipped with an in-situ porewater sampler driven by an osmotic pump. The observatories were developed within the cross cutting project (CCP 4) mud volcanic episodicity at MARUM. The observatories were successfully recovered during two dives with the ROV. The data logger successfully recorded the parameters temperature and pressure during the entire deployment period. While the temperature variations were generally small, the complex pattern of variability in pore pressure supposes considerable changes in the fluid flow through the mud volcano. Detailed analyses of the pressure changes as well as the analytics of the sampled pore water in-situ will be conducted on shore. Due to technical problems, no further dive to the mud volcanoes was possible during the cruise. The second main objective of the cruise was to recover sediments to study the thermal structure as well as the temporal evolution of the mud volcanoes. In order to achieve this, the gravity corer was equipped with autonomously recording temperature loggers on the outside of the barrel. Sediments and temperature gradients were successfully obtained at Athina and Amsterdam Mud Volcano. On-shore analyses of the comprehensive samples and data will help to better understand the activity of the mud volcanoes with regard to the timing and magnitude of mud eruption and fluid flow during quiescent periods. Planned sediment sampling with a multicorer for undisturbed surface sediments was not successful due to malfunction of the tool. Multibeam echosounder (MBES) data with the hull mounted ELAC swath sounder (SB3050) was acquired in the area of Amsterdam, Athina, and Kazan Mud Volcano in order to increase the quality of the bathymetric maps. Due to the limited resolution of the MBES, the already existing data recorded during the R/V METEOR Cruise M70/3 could only be marginally improved. In order to acquire sound velocity profiles (SVP) for the hydroacoustic equipment ELAC and the underwater subpositioning system GAPS, a memory CTD was deployed several times.

Messungen / Measurements

Institut
Institute
Wissenschaftler
Scientist
Anzahl
Number
Einheit
Unit
Typ der Messungen
Type of measurements
Kommentar
Comments
Daten im DOD
Data in DOD
GEOUNB Sahling H. 22 stations G04
Core-soft bottom (no. of cores)
Gravity coring with geothermal temperature measurements. 27.04.2016 no
GEOUNB Sahling H. 2 diving(s) G08
Bottom photography
Remotely operated vehicle (ROV) MARUM-SQUID dives recorded videos and photos. 27.04.2016 no
GEOUNB Sahling H. 9 survey G74
Multi-beam echosounding
hull-mounted ELAC multibeam echosounder for bathymetry and backscatter in water column. 27.04.2016 no
GEOUNB Sahling H. 4 stations H10
CTD-Stations
memory CTD to calculate sound velocity profiles. 27.04.2016 no

Verankerungen / Moorings

Institut
Institute
Wissenschaftler
Scientist
Typ der Messungen
Type of measurements
Kommentar
Comments
geogr.Breite
Latitude
geogr.Länge
Longitude
Daten im DOD
Data in DOD
GEOUNB Sahling H. G72 Recovery of P-mooring deployed 08.02.2014 35° 23.6' N 30° 12.9' E no
GEOUNB Sahling H. H72 Recovery of T-mooring deployed 08.02.2014 35° 23.6' N 30° 12.9' E no
16.11.2019