BODC Cruise Metadata Report for RRS James Clark Ross (74JC) cruise JR20120708 (JR269B)
Introduction
This report collates information from the BODC cruise inventory and oceanographic databases. It presents
- Cruise Inventory Information
- A summary of BODC data holdings for the cruise from the
- References - including cruise tracks and cruise reports
Cruise Inventory Information
| Long name | RRS James Clark Ross (74JC) cruise JR20120708 (JR269B) |
|---|---|
| Short name | JR20120708 (JR269B) |
| Objectives and Narrative |
Cruise JR269B was the second leg (the first being JR269A in late summer 2011) of a programme to investigate methane hydrate accumulation beneath, and methane venting from, the sea bed in an area on the western margin of the Svalbard archipelago. This area is being studied by a number of laboratories and programmes in order to gain better understanding of the relationships between sea floor temperature changes, the methane hydrate stability zone beneath the sea floor, the presence, formation and dissociation of methane hydrate, the nature and distribution of fluid escape features at and beneath the sea floor, and the resulting fluxes of methane into the water column and atmosphere.
The specific objective of this project is to improve estimates of the total amounts of methane and hydrate involved in this process by quantifying the porosity, and the saturation of that porosity with either methane gas or methane hydrate, in the upper few hundred metres beneath the sea floor. To this end, effort during JR269B focused on acquiring controlled source electromagnetic (CSEM) geophysical survey data from two locations - one to the west of Prins Karl Forland, and one on the Vestnesa Ridge. Analysis of the data will aim to combine constraints on the electrical resistivity structure of the sea floor from this study with seismic constraints from previous studies through constrained and joint inversion methods. |
| Ship | RRS James Clark Ross |
| Departure Port | Reykjavík, Iceland |
| Departure Date | 2012-07-07 |
| Arrival Port | Reykjavík, Iceland |
| Arrival Date | 2012-07-24 |
| Principal Scientist(s) | Martin C Sinha (National Oceanography Centre, Southampton) |
| Responsible Organisation | University of Southampton School of Ocean and Earth Science |
| Associated Project(s) | Arctic hydrate dissociation as a consequence of climate change: |
| IHB Sea Areas Visited | Arctic Ocean |
| Marsden Squares Visited | 288 |
| Work Area Description | West Spitzbergen continental margin |
| Unable to lookup cruise bounds at this time | |
| Work Area Bounding Polygon | |
| Southern Limit | unknown |
| Northern Limit | unknown |
| Western Limit | unknown |
| Eastern Limit | unknown |
Cruise Inventory Datasets
| Physical oceanography | |
|---|---|
| Bathythermograph |
Quantity:
number of profiles =
3
Description: XBT casts |
| CTD stations |
Quantity:
number of profiles =
4
Description: CTD casts |
| Current profiler (eg ADCP) |
Quantity:
track kilometres =
8
Description: ADCP measurements |
| Other physical oceanographic measurements |
Quantity:
track kilometres =
130
Description: Water column acoustic measurements for detecting bubble plumes |
| Surface measurements underway (T,S) |
Quantity:
activity duration in days =
18
Description: Standard meteorology and sea surface measurements underway |
| Meteorology | |
| Atmospheric chemistry |
Quantity:
activity duration in days =
18
Description: Continuous air chemistry measurements for methane using PICARRO system |
| Atmospheric chemistry |
Quantity:
activity duration in days =
18
Description: Daily air samples |
| Routine standard measurements |
Quantity:
activity duration in days =
18
Description: Standard meteorology and sea surface measurements underway |
| Geology and geophysics | |
| Bottom photography |
Quantity:
number of dives =
27
Description: HYBIS remotely operated vehicle dives |
| Geophysical measurements made at depth |
Quantity:
track kilometres =
60
Description: Controlled source electromagnetic survey |
| Multi-beam echosounding |
Quantity:
track kilometres =
130
Description: Swath bathymetry survey |
| Multichannel seismic reflection |
Quantity:
track kilometres =
115
Description: Multi-channel seismic reflection profiling |
| Other geological/geophysical measurements |
Quantity:
track kilometres =
60
Description: Controlled source electromagnetic survey |
Cruise Inventory Mooring/Buoy Operations
No information on datasets is currently available
Summary of BODC Data Holdings for the Cruise
National Oceanographic Database
No data currently held for this cruise in the BODC National Oceanographic Database
Project Database
No data currently held for this cruise in the BODC Project Database
