Deutsches Ozeanographisches
Datenzentrum Inventur der Sonne1-Reise SO226-1 CHRIMP (DOD-Ref-No.20130115)
Inventory of Sonne1 Cruise SO226-1 CHRIMP (DOD-Ref-No.20130115)

Plattform
Platform
Reise-Nr.
Cruise-No.
Zeitraum
Period
Projekt
Project
Arbeitsgebiet
Working area
Sonne1 SO226-1 CHRIMP 07.01.2013 - 07.02.2013 SFB 754
CHRIMP
 
South Pacific Ocean  

Fahrtleiter
Chief Scientist
Institut
Institute
Auslaufhafen
Port of departure
Einlaufhafen
Port of return
Stationskarte
Station map
Schiffsroute
Trackchart
Bialas Joerg GEOMAR Helmholtz-Zentrum fur Ozeanforschung Kiel Auckland Lyttelton Karte
Map
 

Ziel der Reise / Objectives of Cruise:

In the context of marine Methane release the existence of marine gas hydrates is of certain relevance. Occurrence of marine gas hydrates depends on temperature, pressure, available gas and fresh water. Usually they do not appear at the seafloor but a few tens of meters below. Therefore changes in pressure and bottom water temperature will influence the formation or dissolution of gas hydrates. As such the gas hydrate stability zone (GHSZ) provides a large buffer for Methane [G.R. Dickens, 2001]. Pressure increase due to sea level rise may increase the GHSZ and bound more Methane, while an increase of bottom water temperature will decrease the GHSZ and reduce the uptake of Methane [Kennett et al., 2000]. In general both parameters vary slowly and hence changes do not result in large Methane contribution to the atmosphere. An exception could be a sudden dissolution of larger quantities of gas hydrate with a related expulsion of Methane. Such focused fluid flow appears as funnel-shaped depressions at the seafloor, so called 'pockmarks'. Typical dimensions are within a few hundreds of meters. However, five to twelve kilometre wide 'giant pockmarks' (GP) are known as well. Although full understanding of the mechanism of formation of these pockmarks is lacking the GPs are thought to be responsible for massive gas release causing the Palaeocene/Eocene Thermal Maximum (PETM) at about 55 million years ago. A current model expects a volume of gas to move pore water through the sediment. Fluidised sediments than allow a sudden gas release into the ocean [Cathles et al., 2010], during which the gas is not completely dissolved in the water column and Methane may reach the atmosphere [Schmale et al., 2005]. Offshore New Zealand a large number of pockmarks has been identified at the southern slope of the Chatham Rise. Among these are a few giant pockmarks [Davy et al., 2010]. The 1000 km long and 100 km wide ridge separates subtropical water masses (East Cape current) in the North from sub-antarctic water currents (Southland current) in the South by the Sub Tropical Front (STF; Fig. 1.1.1)[Chiswell, 2002; Sutton, 2001]. The STF is bound to the bathymetry of the Chatham Rise and hence stayed stable during glacial cycles[Sikes et al., 2002]. Therefore pockmark systems can be studied in the context of exceptionally stable water temperature during glacial sea level variations. Cruise SO226 left the port of Auckland, NZ, on 09.01.2013 and returned to the port of Lyttleton, NZ, on 06.02.2013. Three areas with small, medium and giant pockmarks were visited. 2D and 3D multichannel seismic, Ocean-Bottom Seismometer, Parasound and Bathymetry data were acquired along the Chatham Rise.

Messungen / Measurements

Institut
Institute
Wissenschaftler
Scientist
Anzahl
Number
Einheit
Unit
Typ der Messungen
Type of measurements
Kommentar
Comments
Daten im DOD
Data in DOD
GEOMAH Bialas Joerg 5 tracks G74
Multi-beam echosounding
Multibeam and Parasound. 11.01.2013 no
GEOMAH Bialas Joerg 10 tracks G74
Multi-beam echosounding
Multibeam and Parasound. 13.01.2013 no
GEOMAH Bialas Joerg 13 tracks G74
Multi-beam echosounding
Multibeam and Parasound. 14.01.2013 no
GEOMAH Bialas Joerg 14 tracks G74
Multi-beam echosounding
Multibeam and Parasound. 16.01.2013 no
GEOMAH Bialas Joerg 20 tracks G74
Multi-beam echosounding
Multibeam and Parasound. 21.01.2013 no
GEOMAH Bialas Joerg 2 tracks G76
Multichannel seismic reflection
2D MCS Streamer and OBS. 04.02.2013 no
GEOMAH Bialas Joerg 5 tracks G76
Multichannel seismic reflection
3D MCS Streamer and OBS. 26.01.2013 no
GEOMAH Bialas Joerg 12 tracks G76
Multichannel seismic reflection
3D MCS Streamer and OBS. 15.01.2013 no
GEOMAH Bialas Joerg 14 tracks G76
Multichannel seismic reflection
2D MCS Streamer and OBS. 22.01.2013 no
GEOMAH Bialas Joerg 20 tracks G76
Multichannel seismic reflection
2D MCS Streamer and OBS. 26.01.2013 no
GEOMAH Bialas Joerg 22 tracks G76
Multichannel seismic reflection
2D MCS Streamer and OBS. 28.01.2013 no
GEOMAH Bialas Joerg 23 tracks G76
Multichannel seismic reflection
2D MCS Streamer and OBS. 11.01.2013 no
GEOMAH Bialas Joerg 36 tracks G76
Multichannel seismic reflection
3D MCS Streamer and OBS. 23.01.2013 no
GEOMAH Bialas Joerg 43 tracks G76
Multichannel seismic reflection
3D MCS Streamer and OBS. 16.01.2013 no
GEOMAH Bialas Joerg 90 tracks G76
Multichannel seismic reflection
3D MCS Streamer and OBS. 29.01.2013 no
GEOMAH Bialas Joerg 26 stations H00
Stations
- yes
GEOMAH Bialas Joerg 1 n miles H80
Other physical measurements
Underway measurements during the whole trip such as coordinates, depth, meteorological parameter and so on yes

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
GEOMAH Bialas Joerg G26 10 OBS 44° 15.5' S 177° 12.1' E no
GEOMAH Bialas Joerg G26 18 OBS 44° 18.7' S 177° 3.1' E no
GEOMAH Bialas Joerg G26 19 OBS 43° 59.7' S 178° 38.0' E no
GEOMAH Bialas Joerg G26 3 OBS 44° 3.5' S 178° 31.9' E no
GEOMAH Bialas Joerg H10 CTD 44° 14.9' S 178° 40.0' E no
GEOMAH Bialas Joerg H10 CTD 41° 39.3' S 178° 55.0' E no
16.11.2019