BODC Cruise Metadata Report for RRS James Clark Ross (74JC) cruise JR20110825 (JR269A)
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 JR20110825 (JR269A) |
|---|---|
| Short name | JR20110825 (JR269A) |
| Objectives and Narrative | The main goal of cruise JR269A was to use the Ifremer deep-towed low-frequency Chrip profile SYSIF and a high-resolution seismic reflection system to image gas transport structures and their geological setting beneath areas of active escape of methane gas into the ocean through the methane hydrate stability zone and at and close to the landward limit of the hydrate stability zone. These zones of gas escape were identified during RRS James Clark Ross cruise 211 in 2008 and have received further investigation during several subsequent cruises. Subsidiary goals were to determine in detail the seismic velocity structure of the regions imaged using ocean bottom seismometers, and to fully test the refurbished DASI deep-towed electromagnetic source by conducting a controlled source electromagnetic profile across three seabed electromagnetic recorders. Work was focused in two areas: a southern area close to the landward limit of the hydrate stability field, and a smaller northern area around a large pockmark on the Vestnesa Ridge sediment drift. The cruise was highly successful; the weather was very good, the ship performed well, and there was little downtime. Spectacular images were obtained with SYSIF and the high-resolution reflection system also performed well. Both survey areas revealed a great deal of complexity. |
| Ship | RRS James Clark Ross |
| Departure Port | Longyearbyen, Svalbard and Jan Mayen |
| Departure Date | 2011-08-27 |
| Arrival Port | Longyearbyen, Svalbard and Jan Mayen |
| Arrival Date | 2011-09-05 |
| Principal Scientist(s) | Tim A Minshull (University of Southampton School of Ocean and Earth Science) |
| Responsible Organisation | National Oceanography Centre, Southampton |
| Associated Project(s) | |
| IHB Sea Areas Visited | Greenland Sea |
| Marsden Squares Visited | 287/288/935 |
| Work Area Description | Greenland Sea |
| 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 | |
|---|---|
| CTD stations |
Quantity:
number of stations =
2
Description: CTD casts -To provide sound velocity structures for swath systems - Seabird's911plus CTD system measuring temperature and salinity and calculating sound velocity |
| Geology and geophysics | |
| Multi-beam echosounding |
Quantity:
number of track lines =
179
Description: Kongsberg EM122 multibeam echosounder - seafloor mapping and mapping of gas plumes in water column |
| Multichannel seismic reflection |
Quantity:
number of profiles =
28
Description: Multi-channel seismic reflection profiles - source single GI gun (45cu.in/45cu.in.) - receicer: 60-channel streamer - To image the shallow sedimentary structure |
| Other geological/geophysical measurements |
Quantity:
number of profiles =
1
Description: DASI controlled source electromagnetic source recorded on OBEMs |
| Seismic refraction |
Quantity:
number of profiles =
2
Description: Wide-angle seismic profiles with SYSIF source recorded on ocean bottom seismometers |
| Seismic refraction |
Quantity:
number of profiles =
6
Description: Wide-angle seismic profiles with GI-gun source recorded on ocean bottom seismometers |
| Single channel seismic reflection |
Quantity:
number of track lines =
57
Description: Topas PS15 sub-bottom profiler - To identify and characterise layers of sediment beneath the seafloor |
| Single channel seismic reflection |
Quantity:
number of profiles =
28
Description: SYSIF system: Deep towed seismic system for very high resolution survey - To image the shallow sedimentary structure with higher resolution than MCS reflection profiles |
| Single-beam echosounding |
Quantity:
number of track lines =
170
Description: Simrad EK60 multi-frequency echosounder - to map gas plumes in water column |
Cruise Inventory Mooring/Buoy Operations
| Latitude | Longitude | Data type | Description |
|---|---|---|---|
| 78° 36' N | 9° 6' E | Magnetic measurements | Ocean Bottom Electro-magnetometer (OBEM01) -Depth: 531m Deployment time: 2011:241:14:49 - Recovery time: 2011:244:14:17 |
| 78° 36' N | 9° 7' E | Magnetic measurements | Ocean Bottom Electro-magnetometer (OBEM02) -Depth: 537.62m Deployment time: 2011:243:11:40 - Recovery time: 2011:247:15:18 |
| 78° 36' N | 9° 8' E | Magnetic measurements | Ocean Bottom Electro-magnetometer (OBEM03) -Depth: 530m Deployment time: 2011:243:13:230 - Recovery time: 2011:247:16:20 |
| 78° 33' N | 9° 21' E | Multichannel seismic reflection | Ocean Bottom seismometer (OBS01) - Depth: 468m Deployment time: 2011:241:11:34 - Recovery time: 2011:244:11:32 |
| 78° 33' N | 9° 22' E | Multichannel seismic reflection | Ocean Bottom seismometer (OBS02) - Depth: 449m Deployment time: 2011:241:09:29 - Recovery time: 2011:244:08:45 |
| 78° 33' N | 9° 21' E | Multichannel seismic reflection | Ocean Bottom seismometer (OBS03) - Depth: 491m Deployment time: 2011:241:12:37 - Recovery time: 2011:244:10:40 |
| 78° 32' N | 9° 16' E | Multichannel seismic reflection | Ocean Bottom seismometer (OBS04) - Depth: 504m Deployment time: 2011:241:11:34 - Recovery time: 2011:244:11:32 |
| 79° 0' N | 6° 54' E | Multichannel seismic reflection | Ocean Bottom seismometer (OBS05) - Depth: 1207.30m Deployment time: 2011:245:09:45 - Recovery time: 2011:246:12:06 |
| 79° 0' N | 6° 47' E | Multichannel seismic reflection | Ocean Bottom seismometer (OBS08) - Depth: 1259.50m Deployment time: 2011:245:11:30 - Recovery time: 2011:246:10:48 |
| 78° 33' N | 9° 21' E | Seismic refraction | Ocean Bottom seismometer (OBS01) - Depth: 468m Deployment time: 2011:241:11:34 - Recovery time: 2011:244:11:32 |
| 78° 33' N | 9° 22' E | Seismic refraction | Ocean Bottom seismometer (OBS02) - Depth: 449m Deployment time: 2011:241:09:29 - Recovery time: 2011:244:08:45 |
| 78° 33' N | 9° 21' E | Seismic refraction | Ocean Bottom seismometer (OBS03) - Depth: 491m Deployment time: 2011:241:12:37 - Recovery time: 2011:244:10:40 |
| 78° 32' N | 9° 16' E | Seismic refraction | Ocean Bottom seismometer (OBS04) - Depth: 504m Deployment time: 2011:241:11:34 - Recovery time: 2011:244:11:32 |
| 79° 0' N | 6° 54' E | Seismic refraction | Ocean Bottom seismometer (OBS05) - Depth: 1207.30m Deployment time: 2011:245:09:45 - Recovery time: 2011:246:12:06 |
| 79° 0' N | 6° 47' E | Seismic refraction | Ocean Bottom seismometer (OBS08) - Depth: 1259.50m Deployment time: 2011:245:11:30 - Recovery time: 2011:246:10:48 |
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
