BODC Cruise Metadata Report for RRS Discovery cruise DY090
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 cruise DY090 |
|---|---|
| Short name | DY090 |
| Objectives and Narrative |
This was the second of two cruises (first was DY086) aimed at evaluating the controls over mesopelagic remineralisation depth. This is the depth to which material sinks when it leaves the surface ocean, a factor we know to be a critical control over climate. There are three hypotheses explaining what controls this depth: plankton community structure, temperature and oxygen concentrations. The data collected during the COMICS cruises will test two of these: oxygen and community structure with DY090 examining the role of oxygen concentration, in particular how temporal variability in mesopelagic oxygen minima affects the remineralisation depth of sinking organic carbon.
In order to evaluate this 4 long stations of about 6 days duration each were worked over a 4 week period between May and June in the oxygen minimum zone in the Benguela upwelling region off the Namibian coast. Three of the stations were undertaken as a time series to investigate the evolution of the remineralisation depth in an oxygen minimum zone (~ 18S, 11E). The other station was in a relatively high oxygen region and served as a baseline to compare against (~ 21.5S, 9.5E). At each station surface and mesopelagic biomass and community structure, and a variety of metrics of downward particle flux were measured, together with estimates of the biomass and growth rates of the major taxonomic classes of organisms responsible for consuming sinking material. |
| Ship | RRS Discovery |
| Departure Port | Walvis Bay, Namibia |
| Departure Date | 2018-05-23 |
| Arrival Port | Cape Town, South Africa |
| Arrival Date | 2018-06-28 |
| Principal Scientist(s) | Stephanie Henson (National Oceanography Centre, Southampton) |
| Responsible Organisation | National Oceanography Centre, Southampton |
| Associated Project(s) | Controls over Ocean Mesopelagic Interior Carbon Storage: COMICS |
| IHB Sea Areas Visited | South East Atlantic Ocean (limit 20W) |
| Marsden Squares Visited | 370;1/407;4 |
| Work Area Description | Benguela Upwelling |
| 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 profiles =
9
Description: Trace Metal CTD casts |
| CTD stations |
Quantity:
activity duration in days =
120
Description: Gliders |
| Optics (eg underwater light levels) |
Quantity:
number of deployments =
35
Description: Red Camera Frame |
| Transparency (eg transmissometer) |
Quantity:
number of deployments =
35
Description: Red Camera Frame |
| Chemical oceanography | |
| Alkalinity |
Quantity:
number of profiles =
29
Description: Stainless Steel CTD Casts |
| Ammonia |
Quantity:
number of deployments =
167
Description: Marine Snow Catchers |
| Nitrate |
Quantity:
number of profiles =
9
Description: Trace Metal CTD casts |
| Other chemical oceanographic measurements |
Quantity:
number of profiles =
29
Description: Stainless Steel CTD Casts |
| Other dissolved gases |
Quantity:
number of profiles =
9
Description: Trace Metal CTD casts |
| Oxygen |
Quantity:
number of profiles =
9
Description: Trace Metal CTD casts |
| Phosphate |
Quantity:
number of profiles =
9
Description: Trace Metal CTD casts |
| Silicate |
Quantity:
number of profiles =
29
Description: Stainless Steel CTD Casts |
| Contamination | |
| Suspended matter |
Quantity:
number of deployments =
167
Description: Marine Snow Catchers |
| Suspended matter |
Quantity:
number of deployments =
8
Description: Stand Alone Pumping Systems |
| Biology and fisheries | |
| Dissolved organic matter (inc DOC) |
Quantity:
activity duration in days =
120
Description: Gliders |
| Dissolved organic matter (inc DOC) |
Quantity:
number of profiles =
29
Description: Stainless Steel CTD Casts |
| Nekton |
Quantity:
number of hauls =
19
Description: RMT 25 NET |
| Particulate organic matter (inc POC, PON) |
Quantity:
activity duration in days =
120
Description: Gliders |
| Particulate organic matter (inc POC, PON) |
Quantity:
number of deployments =
167
Description: Marine Snow Catchers |
| Particulate organic matter (inc POC, PON) |
Quantity:
number of profiles =
29
Description: Stainless Steel CTD Casts |
| Phytoplankton pigs (eg chlorophyll, fluorescence) |
Quantity:
number of profiles =
29
Description: Stainless Steel CTD Casts |
| Primary productivity |
Quantity:
number of profiles =
29
Description: Stainless Steel CTD Casts |
| Zooplankton |
Quantity:
number of hauls =
7
Description: Mango net |
| Zooplankton |
Quantity:
number of hauls =
7
Description: Mammoth net |
| Zooplankton |
Quantity:
number of hauls =
14
Description: MOCNESS Net |
| Zooplankton |
Quantity:
number of hauls =
29
Description: BONGO Net |
| Zooplankton |
Quantity:
number of profiles =
29
Description: Stainless Steel CTD Casts |
Cruise Inventory Mooring/Buoy Operations
| Latitude | Longitude | Data type | Description |
|---|---|---|---|
| 18° 0' S | 11° 0' E | Biochemical measurements (eg lipids, amino acids) | 7 Deployments of Drifting neutrally bouyant sediment traps |
| 18° 0' S | 11° 0' E | CTD stations | 1 Slocum glider was deployed in February from the RV Mirabilis and recovered during this cruise. |
| 18° 0' S | 11° 0' E | Neutrally buoyant floats | 7 Deployments of Drifting neutrally bouyant sediment traps |
| 18° 0' S | 11° 0' E | Oxygen | 1 Slocum glider was deployed in February from the RV Mirabilis and recovered during this cruise. |
| 18° 0' S | 11° 0' E | Oxygen | 7 Deployments of Drifting array of in situ respirometers |
| 18° 0' S | 11° 0' E | Particulate organic matter (inc POC, PON) | 1 Slocum glider was deployed in February from the RV Mirabilis and recovered during this cruise. |
| 18° 0' S | 11° 0' E | Particulate organic matter (inc POC, PON) | 7 Deployments of Drifting array of in situ respirometers |
| 18° 0' S | 11° 0' E | Particulate organic matter (inc POC, PON) | 7 Deployments of Drifting neutrally bouyant sediment traps |
| 18° 0' S | 11° 0' E | Phytoplankton pigs (eg chlorophyll, fluorescence) | 1 Slocum glider was deployed in February from the RV Mirabilis and recovered during this cruise. |
| 18° 0' S | 11° 0' E | Sediment traps | 7 Deployments of Drifting array of in situ respirometers |
| 18° 0' S | 11° 0' E | Sediment traps | 7 Deployments of Drifting neutrally bouyant sediment traps |
| 18° 0' S | 11° 0' E | Subsurface temperature and salinity measurements | 7 Deployments of Drifting neutrally bouyant sediment traps |
| 18° 0' S | 11° 0' E | Surface drifters/drifting buoys | 7 Deployments of Drifting array of in situ respirometers |
| 18° 0' S | 11° 0' E | Transparency (eg transmissometer) | 1 Slocum glider was deployed in February from the RV Mirabilis and recovered during this cruise. |
Summary of BODC Data Holdings for the Cruise
National Oceanographic Database
Summary
| # Series | Instrument Description | Parameters |
|---|---|---|
| 1 | Acoustic doppler current profiler |
Date and time Horizontal platform movement Horizontal spatial co-ordinates Horizontal velocity of the water column (currents) Reference numbers Vertical spatial coordinates |
| 1 | Meteorological data logger |
Air pressure Air temperature Atmospheric humidity Date and time Horizontal spatial co-ordinates Raw light meter output Solar Radiation Visible waveband radiance and irradiance measurements in the atmosphere Wind strength and direction |
| 1 | Multiple instrument types |
Chlorophyll pigment concentrations in water bodies Date and time Electrical conductivity of the water column Horizontal spatial co-ordinates Metadata parameters Raw fluorometer output Raw suspended particulate material concentration sensor output Salinity of the water column Temperature of the water column Transmittance and attenuance of the water column |
| 1 | Single-beam echosounder |
Bathymetry and Elevation Date and time Horizontal platform movement Horizontal spatial co-ordinates Platform or instrument orientation |
Note: Parameter terms are taken from the BODC Parameter Discovery Vocabulary XML (SKOS)
Full List
| BODC Reference | Instrument Description | Date/Time | Location | |
|---|---|---|---|---|
| 1964964 | Single-beam echosounder | 2018-05-23 07:51Z to 2018-06-27 11:55Z | 34° 4' S to 17° 51' S; 9° 10' E to 17° 58' E | Click for more |
| 1964976 | Meteorological data logger | 2018-05-23 07:51Z to 2018-06-27 11:55Z | 34° 4' S to 17° 51' S; 9° 10' E to 17° 58' E | Click for more |
| 1964988 | Multiple instrument types | 2018-05-23 07:51Z to 2018-06-27 11:55Z | 34° 4' S to 17° 51' S; 9° 10' E to 17° 58' E | Click for more |
| 2012082 | Acoustic doppler current profiler | 2018-05-23 08:57:12Z to 2018-06-23 12:43:38Z | From 22° 50' S, 14° 28' E to 22° 58' S, 14° 16' E | Click for more |
Project Database
No data currently held for this cruise in the BODC Project Database
