BODC Cruise Metadata Report for RRS Discovery (74E3) cruise D308
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 Discovery (74E3) cruise D308 |
|---|---|
| Short name | D308 |
| Objectives and Narrative |
RRS Discovery cruise 308 was the fourth field campaign of the project RAPID-WAVE (West Atlantic Variability Experiment), funded by the NERC Rapid Climate Change thematic programme (RAPID).
RAPID-WAVE aims at investigating how signals associated with changes in the Atlantic meridional overturning circulation propagate along the Atlantic deep western boundary current. As part of the project, two cruises took place in 2004. In the first one, a line of 6 Bottom Pressure Recorders (BPR) was deployed in an operation area approximately located at 36.5 N 67.5 W. In the second one, two additional lines of 6 BPRs and 5 CTD moorings each were deployed on the continental shelf break approximately south of St. Johns and southeast of Halifax, respectively. The aim of D308 was to recover and redeploy the BPRs and moorings deployed in 2004 along the St. Johns and Halifax lines. In conjunction with the recovery/redeployment operations, CTD casts were planned to be carried out and to include helium, tritium and oxygen sampling (for calibration of the CTD oxygen sensor). Measurement of tritium-helium ratios provides estimates of ventilation age up to about 20 year and is therefore very useful for inferring timescales of water-mass age and tracer transport by the Atlantic deep western boundary current. The cruise encountered mixed success as regards the recovery of instruments: only 50% of the BPRs and 20% of the moorings could be retreived. All planned CTD casts and sampling operations were completed. |
| Ship | RRS Discovery |
| Departure Port | St. John's, Canada |
| Departure Date | 2006-07-24 |
| Arrival Port | St. John's, Canada |
| Arrival Date | 2006-08-15 |
| Principal Scientist(s) | Miguel Angel Morales Maqueda (Proudman Oceanographic Laboratory) |
| Responsible Organisation | Proudman Oceanographic Laboratory |
| Associated Project(s) | Rapid Climate Change (RAPID) |
| IHB Sea Areas Visited | North West Atlantic Ocean (limit 40W) |
| Marsden Squares Visited | 150/151 |
| Work Area Description | Continental slope southwest of Grand Banks, and continental slope southeast of Nova Scotia |
| 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 stations conducted with UKORS SeaBird 911+ instrument:- Test site: 25/7/06, 20:33Z, to 550 m, 43 43.1N 052 14.0W Test site: 27/7/06, 22:03Z, 3150m depth, 42 54.3N 52 28.8W For each of these stations, two 300kHz LADCPs (downward and upward-looking), an oxygen sensor, a fluorometer, a transmissometer, a back scatter sensor and an altimeter were fitted on the CTD frame |
| CTD stations |
Quantity:
number of stations =
6
Description: CTD stations conducted with UKORS SeaBird 911+ instrument:- Site A0: 29/7/06, 03:53Z, 1770m depth, 43 15.7 N, 52 11.2 W Site A1: 28/7/06, 22:59Z, 2205m depth, 43 13.4 N, 52 16.5 W Site A2: 28/7/06, 18:08Z, 2785m depth, 43 07.9 N, 52 23.6 W Site A3: 11/8/06, 21:52Z, 3150m depth, 42 55.7 N, 52 28.5 W Site A4: 12/8/06, 14:57Z, 3630m depth, 42 39.9 N, 52 38.7 W Site A5: 12/8/06, 09:35Z, 4080m depth, 42 29.1 N, 52 50.2 W For each of these stations, two 300kHz LADCPs (downward and upward-looking), an oxygen sensor, a fluorometer, a transmissometer, a back scatter sensor and an altimeter were fitted on the CTD frame |
| CTD stations |
Quantity:
number of stations =
8
Description: CTD stations conducted with UKORS SeaBird 911+ instrument:- Site B0: 01/8/06, 06:40Z, 1710m depth, 43 00.3 N, 60 55.4 W Site B1: 06/8/06, 14:38Z, 2180m depth, 42 55.4 N, 60 51.9 W Site B2: 01/8/06, 23:09Z, 2680m depth, 42 49.4 N, 60 46.3 W Site B2, 06/8/06, 11:47Z, 2660m depth, 42 50.0 N, 60 46.7 W Site B3: 04/8/06, 22:42Z, 3310m depth, 42 38.4 N, 60 41.0 W Site B4: 06/8/06, 21:49Z, 3660m depth, 42 25.7 N, 60 26.2 W Site B5: 04/8/06, 02:23Z, 4100m depth, 42 13.1 N, 60 16.6 W Site B5: 08/8/06, 00:36Z, 4020m depth, 42 15.1 N, 60 18.0 W For each of these stations, two 300kHz LADCPs (downward and upward-looking), an oxygen sensor, a fluorometer, a transmissometer, a back scatter sensor and an altimeter were fitted on the CTD frame Note that two CTD casts were carried out on site B2. The second one was needed to collect a near bottom sample that was omitted in the first cast. No other bottle samples were taken in this second cast. Note that two CTD casts were carried out on site B5. The second cast was made in order to calibrate the SBE37 instruments to be deployed in the UKORS moorings. No water samples were taken in this second cast. |
| CTD stations |
Quantity:
number of stations =
3
Description: CTD stations conducted with UKORS SeaBird 911+ instrument:- Site C1: 09/8/06, 21:52Z, 4560m depth, 41 48.0 N, 60 00.0 W Site C2: 10/8/06, 18:08Z, 4760m depth, 41 57.3 N, 56 34.0 W Site C3: 11/8/06, 11:37Z, 4910m depth, 42 06.0 N, 53 09.3 W |
| Geochemical tracers (eg freons) |
Quantity:
number of stations =
19
Description: Helium and tritium tracer samples were drawn from Niskin bottles on above CTD casts. Samples will be shipped back to UK. Between 11 and 16 helium/tritium samples were drawn from each cast. Six oxygen samples were also taken per cast for calibration of the oxygen sensor. |
| Surface measurements underway (T,S) |
Quantity:
activity duration in days =
21
Description: The Discovery "surfmet" package was switched on for the duration of the cruise, providing thermosalinograph measurements (sea surface temperature, conductivity, fluorescence, beam transmission) and meteorology measurements (barometric pressure, wind speed & direction, air temperature, humidity, photosynthetically-active radiation and total incidence radiation). True wind speed and direction (rather than relative to ship) were derived, and uncalibrated sea surface salinity. |
| Chemical oceanography | |
| Oxygen |
Quantity:
number of stations =
19
Description: Helium and tritium tracer samples were drawn from Niskin bottles on above CTD casts. Samples will be shipped back to UK. Between 11 and 16 helium/tritium samples were drawn from each cast. Six oxygen samples were also taken per cast for calibration of the oxygen sensor. |
| Meteorology | |
| Incident radiation |
Quantity:
activity duration in days =
21
Description: The Discovery "surfmet" package was switched on for the duration of the cruise, providing thermosalinograph measurements (sea surface temperature, conductivity, fluorescence, beam transmission) and meteorology measurements (barometric pressure, wind speed & direction, air temperature, humidity, photosynthetically-active radiation and total incidence radiation). True wind speed and direction (rather than relative to ship) were derived, and uncalibrated sea surface salinity. |
| Routine standard measurements |
Quantity:
activity duration in days =
21
Description: The Discovery "surfmet" package was switched on for the duration of the cruise, providing thermosalinograph measurements (sea surface temperature, conductivity, fluorescence, beam transmission) and meteorology measurements (barometric pressure, wind speed & direction, air temperature, humidity, photosynthetically-active radiation and total incidence radiation). True wind speed and direction (rather than relative to ship) were derived, and uncalibrated sea surface salinity. |
| Geology and geophysics | |
| Single-beam echosounding |
Quantity:
activity duration in days =
21
Description: The Simrad EA500 single-beam echosounder was switched on for the duration of the cruise. Corrected depth was calculated using Carter tables. Some manual cleaning of this data was done routinely. |
Cruise Inventory Mooring/Buoy Operations
| Latitude | Longitude | Data type | Description |
|---|---|---|---|
| 42° 55' N | 52° 30' W | Other physical oceanographic measurements | Site A3: Temporary current meter mooring deployed into 3220m, 11/8/06 (Jday 223), 21:24Z Heights of instruments above seafloor: 50, 500 |
| 42° 55' N | 52° 29' W | Other physical oceanographic measurements | Site A3: Temporary current meter mooring recovered from 3220m, 12/8/06 (Jday 224), 21:51Z Heights of instruments above seafloor: 50, 500 |
| 42° 55' N | 60° 51' W | Other physical oceanographic measurements | Site B1: CTD mooring, recovered from 2213m, 1/8/06 (Jday 213), 14:19Z Heights of instruments above seafloor: 100, 200*, 300, 400* (where * denotes CTD [Microcat with pressure sensor], and absence of * denotes CT logger) |
| 42° 36' N | 60° 37' W | Other physical oceanographic measurements | Site B3: CTD mooring, deployed into 3200m, 9/8/06 (Jday 221), 13:06Z Heights of instruments above seafloor: 0**, 250, 500*, 505***, 730, 980* (where ** denotes BPR, *** denotes current meter, * denotes CTD [Microcat with pressure sensor], and absence of * denotes CT logger) |
| 42° 27' N | 60° 25' W | Other physical oceanographic measurements | Site B4: Temporary current meter mooring deployed into 3650m, 5/8/06 (Jday 217), 22:30Z Heights of instruments above seafloor: 50, 500 |
| 42° 27' N | 60° 25' W | Other physical oceanographic measurements | Site B4: Temporary current meter mooring recovered from 3650 m, 7/8/06 (Jday 219), 11:09 Heights of instruments above seafloor: 50, 500 |
| 42° 12' N | 60° 18' W | Other physical oceanographic measurements | Site B5: CTD mooring, deployed into 4100m, 8/8/06 (Jday 220); 14:35Z Heights of instruments above seafloor: 0**, 250, 500*, 625, 775, 925* (where ** denotes BPR, * denotes CTD [Microcat with pressure sensor], and absence of * denotes CT logger) |
| 43° 16' N | 52° 11' W | Sea level (inc. bot. press., inverted echosounder) | Site A0: Bottom Pressure Recorder, recovered from 1807m, 26/7/06 (Jday 207), 12:25Z |
| 43° 12' N | 52° 15' W | Sea level (inc. bot. press., inverted echosounder) | Site A1: Bottom Pressure Recorder, recovered from 2227m, 26/7/06 (Jday 207), 16:12Z |
| 43° 0' N | 60° 54' W | Sea level (inc. bot. press., inverted echosounder) | Site B0: Bottom Pressure Recorder, deployed into 1822m, 1/8/06 (Jday 213), 12:00Z |
| 43° 0' N | 60° 54' W | Sea level (inc. bot. press., inverted echosounder) | Site B0: Bottom Pressure Recorder, recovered from 1838m, 1/8/06 (Jday 213), 11:36Z |
| 42° 55' N | 60° 51' W | Sea level (inc. bot. press., inverted echosounder) | Site B1: Bottom Pressure Recorder, deployed into 2212m, 1/8/06 (Jday 213), 16:46Z |
| 42° 55' N | 60° 51' W | Sea level (inc. bot. press., inverted echosounder) | Site B1: Bottom Pressure Recorder, recovered from 2217m, 1/8/06 (Jday 213), 16:15Z |
| 42° 49' N | 60° 46' W | Sea level (inc. bot. press., inverted echosounder) | Site B2: Bottom Pressure Recorder, deployed into 2704m, 6/8/06 (Jday 218), 10:45Z |
| 42° 49' N | 60° 46' W | Sea level (inc. bot. press., inverted echosounder) | Site B2: Bottom Pressure Recorder, recovered from 2714m, 1/8/06 (Jday 213), 22:47Z |
| 42° 36' N | 60° 37' W | Sea level (inc. bot. press., inverted echosounder) | Site B3: Bottom Pressure Recorder, deployed into 3255m (as part of UKORS mooring), 9/8/06 (jday 221), 13:06Z |
| 42° 37' N | 60° 36' W | Sea level (inc. bot. press., inverted echosounder) | Site B3: Bottom Pressure Recorder, recovered from 3221m, 2/8/06 (Jday 214), 16:10Z |
| 42° 26' N | 60° 28' W | Sea level (inc. bot. press., inverted echosounder) | Site B4: Bottom Pressure Recorder, deployed into 3655m, 8/8/06 (Jday 220), 19:19Z |
| 42° 12' N | 60° 18' W | Sea level (inc. bot. press., inverted echosounder) | Site B5: Bottom Pressure Recorder deployed into 4102m (as part of UKORS mooring), 8/8/06 (Jday 220), 14:35Z |
Summary of BODC Data Holdings for the Cruise
National Oceanographic Database
Summary
| # Series | Instrument Description | Parameters |
|---|---|---|
| 5 | Bottom pressure sensor tide gauge |
Date and time Reference numbers Sea level Temperature of the water column |
| 20 | CTD/STD cast |
Chlorophyll pigment concentrations in water bodies Density of the water column Dissolved oxygen parameters in the water column Salinity of the water column Temperature of the water column Vertical spatial coordinates |
| 5 | Moored CTD |
Date and time Electrical conductivity of the water column Reference numbers Salinity of the water column Temperature of the water column |
| 4 | Moored CTD |
Date and time Electrical conductivity of the water column Moored instrument depth Reference numbers Salinity of the water column Temperature of the water column |
Note: Parameter terms are taken from the BODC Parameter Discovery Vocabulary XML (SKOS)
Full List
| BODC Reference | Instrument Description | Date/Time | Location | |
|---|---|---|---|---|
| 938401 | Moored CTD | 2006-08-09 14:04Z to 2007-10-06 12:34Z | 42° 36' N, 60° 37' W | Click for more |
| 938413 | Moored CTD | 2006-08-09 14:02Z to 2007-10-06 12:32Z | 42° 36' N, 60° 37' W | Click for more |
| 938425 | Moored CTD | 2006-08-08 15:24Z to 2007-10-06 16:24Z | 42° 12' N, 60° 18' W | Click for more |
| 938437 | Moored CTD | 2006-08-08 15:23Z to 2007-10-06 16:23Z | 42° 12' N, 60° 18' W | Click for more |
| 938449 | Moored CTD | 2006-08-08 15:58Z to 2007-10-06 16:28Z | 42° 12' N, 60° 18' W | Click for more |
| 938505 | Moored CTD | 2006-08-09 14:05Z to 2007-10-06 12:36Z | 42° 36' N, 60° 37' W | Click for more |
| 938517 | Moored CTD | 2006-08-09 14:03Z to 2007-10-06 12:33Z | 42° 36' N, 60° 37' W | Click for more |
| 938529 | Moored CTD | 2006-08-08 15:26Z to 2007-10-06 16:26Z | 42° 12' N, 60° 18' W | Click for more |
| 938530 | Moored CTD | 2006-08-08 15:18Z to 2007-10-06 16:48Z | 42° 12' N, 60° 18' W | Click for more |
| 1040731 | Bottom pressure sensor tide gauge | 2006-08-01 20:07Z to 2008-02-06 17:52Z | 43° 0' N, 60° 54' W | Click for more |
| 1040767 | Bottom pressure sensor tide gauge | 2006-08-06 16:07Z to 2007-10-07 12:36Z | 42° 49' N, 60° 46' W | Click for more |
| 1040792 | Bottom pressure sensor tide gauge | 2006-08-09 17:52Z to 2007-10-06 12:06Z | 42° 36' N, 60° 37' W | Click for more |
| 1040823 | Bottom pressure sensor tide gauge | 2006-08-08 21:07Z to 2007-09-29 19:05Z | 42° 26' N, 60° 28' W | Click for more |
| 1040847 | Bottom pressure sensor tide gauge | 2006-08-08 18:52Z to 2007-10-06 16:36Z | 42° 12' N, 60° 18' W | Click for more |
| 1069995 | CTD/STD cast | 2006-07-25 20:26Z | 43° 43' N, 52° 13' W | Click for more |
| 1070007 | CTD/STD cast | 2006-07-27 21:59Z | 42° 54' N, 52° 28' W | Click for more |
| 1070019 | CTD/STD cast | 2006-07-29 03:45Z | 43° 15' N, 52° 11' W | Click for more |
| 1070020 | CTD/STD cast | 2006-07-28 22:57Z | 43° 13' N, 52° 16' W | Click for more |
| 1070032 | CTD/STD cast | 2006-07-28 18:00Z | 43° 7' N, 52° 23' W | Click for more |
| 1070044 | CTD/STD cast | 2006-08-11 21:45Z | 42° 55' N, 52° 28' W | Click for more |
| 1070056 | CTD/STD cast | 2006-08-12 14:55Z | 42° 40' N, 52° 39' W | Click for more |
| 1070068 | CTD/STD cast | 2006-08-12 09:27Z | 42° 29' N, 52° 50' W | Click for more |
| 1070081 | CTD/STD cast | 2006-08-01 06:30Z | 43° 0' N, 60° 55' W | Click for more |
| 1070093 | CTD/STD cast | 2006-08-06 15:03Z | 42° 55' N, 60° 52' W | Click for more |
| 1070100 | CTD/STD cast | 2006-08-01 22:58Z | 42° 49' N, 60° 46' W | Click for more |
| 1070112 | CTD/STD cast | 2006-08-06 11:44Z | 42° 49' N, 60° 46' W | Click for more |
| 1070124 | CTD/STD cast | 2006-08-04 22:35Z | 42° 38' N, 60° 40' W | Click for more |
| 1070136 | CTD/STD cast | 2006-08-06 21:45Z | 42° 25' N, 60° 26' W | Click for more |
| 1070148 | CTD/STD cast | 2006-08-04 02:17Z | 42° 13' N, 60° 16' W | Click for more |
| 1070161 | CTD/STD cast | 2006-08-08 01:24Z | 42° 15' N, 60° 18' W | Click for more |
| 1070173 | CTD/STD cast | 2006-08-09 21:47Z | 41° 48' N, 60° 0' W | Click for more |
| 1070185 | CTD/STD cast | 2006-08-10 18:03Z | 41° 57' N, 56° 34' W | Click for more |
| 1070197 | CTD/STD cast | 2006-08-11 11:33Z | 42° 6' N, 53° 9' W | Click for more |
| 1070204 | CTD/STD cast | 2006-08-02 22:50Z | 42° 13' N, 60° 16' W | Click for more |
Project Database
| # Events | Gear Type | Parameters Held |
|---|---|---|
| 8 | Instrument mooring | |
| 20 | CTD frame plus rosette sampler |
Salinity of the water column
Dissolved oxygen parameters in the water column Temperature of the water column Density of the water column Chlorophyll pigment concentrations in water bodies |
Note: Parameter terms are taken from the BODC Parameter Discovery Vocabulary XML (SKOS)
