Presentation is loading. Please wait.

Presentation is loading. Please wait.

JCR 269A: Arctic hydrate dissociation as a consequence of climate change: determining the vulnerable methane reservoir and gas escape mechanisms Follow-up.

Similar presentations


Presentation on theme: "JCR 269A: Arctic hydrate dissociation as a consequence of climate change: determining the vulnerable methane reservoir and gas escape mechanisms Follow-up."— Presentation transcript:

1 JCR 269A: Arctic hydrate dissociation as a consequence of climate change: determining the vulnerable methane reservoir and gas escape mechanisms Follow-up to IPY cruise JR211 Tim Minshull National Oceanography Centre Southampton

2 JCR 269A Research Objectives How much gas might be released as the Arctic warms, and how quickly and by what routes will it be released? “Steady state” dissociation“Disturbed state” dissociation

3 ? Methane Flux ? Atmospheric Venting ? Gas Volume ? Gas Release Mechanism ? Hydrate Inventory JCR 269A Research Objectives 1.Define the structural and sedimentary architecture of sites of gas venting at the landward limit of hydrate stability and at a pockmark in deeper water where gas is being released. 2.Determine the migration pathways for free gas. 3.Determine the sub-seabed distribution and amounts of hydrate and free gas (mainly during follow-up cruise in 2012).

4 The West Svalbard margin The West Svalbard shelf and slope: is bathed by a northward flowing filament of the North Atlantic Current which is a crucial “barometer” of global ocean warming, is an area of known methane venting with over 250 individual gas bubble plumes ascending through the water-column (with the pre-dominant majority located at the immediate landward edge of the gas hydrate stability zone at ~396 m water depth), is relatively easily accessible with frequent visits of Norwegian, German, and UK vessels for sustained observing programmes.

5 JCR269A Cruise Objectives Acquisition of a series of very-high-resolution seismic reflection profiles using Ifremer’s SYSIF deep-towed Chirp profiler, at a site on the shelf and at a deep-water pockmark site Determining seismic velocities close to the seafloor by recording the SYSIF signal on ocean bottom seismometers Acquisition of complementary high-resolution seismic reflection profiles using Ifremer’s mini-GI gun and the University of Southampton’s high-resolution multichannel streamer Testing of the Southampton DASI electromagnetic source and recording of this source on seabed instruments

6 JCR269A Cruise Schedule Tentative schedule is: Day 1- depart Longyearbyen Days – SYSIF profiling in methane plume area, including deployment and recovery of OBSs Day 4 - deployment/recovery of seafloor electromagnetic equipment and test deployment of DASI Days 5 – 7 – OBS deployment, SYSIF profiling and OBS recovery in Vestnesa Ridge area Days 7 – 9 – profiling with mini-GI gun with multichannel streamer in both areas and additional SYSIF profiling in methane plume area Day 10 – depart for UK


Download ppt "JCR 269A: Arctic hydrate dissociation as a consequence of climate change: determining the vulnerable methane reservoir and gas escape mechanisms Follow-up."

Similar presentations


Ads by Google