Metadata Report for BODC Series Reference Number 1763995
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
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Problem Reports
No Problem Report Found in the Database
UK Ocean Acidification (UKOA) RRS James Clark Ross Cruise JR20120601/JR271 Underway Surface Hydrography Data Quality Report
The cruise report, cruise narrative and flow rate channel were used as a guide to the times when the underway flow was switched off, dropped low or was adjusted during the cruise. Where this occurred, channels PSALSU01, TEMPSU01, TEMPHU01, SVELSG01 and CNDCSG01 were flagged as suspect. Noise in the channels was also flagged.
Data Access Policy
Open Data supplied by Natural Environment Research Council (NERC)
You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."
Narrative Documents
Turner Designs 10AU Field Fluorometer
The Turner Designs 10AU is designed for continuous-flow monitoring or discrete sample analyses of fluorescent species. A variety of optical kits with appropriate filters and lamps are available for a wide range of applications. Individual filters and lamps are also available for customised applications.
Standard optical kits include those for chlorophyll-a (extracted and/or in vivo), phycocyanin, phycoerythrin, CDOM, ammonium, rhodamine and fluorescein dye tracing, crude oil, refined oil, histamine and optical brighteners.
The instrument's light source is a 4 watt lamp and the detector is a photomultiplier tube with a standard detection range of 300-650 nm. A red-sensitive version with a detetion range of 185-970 nm is also available.
Specifications
| Operating temperature | 0 to 55°C |
| Detector | PhotoMultiplier Tube 300 to 650 nm (standard) 185 to 870 nm (Red) |
| Detection Limits: Extracted Chlorophyll-a Rhodamine WT Dye Fluorescein Dye | 0.025 µg L-1 0.01 ppb (in potable water) 0.01 ppb (in potable water) |
| Linear range: Extracted Chlorophyll-a Rhodamine WT Dye Fluorescein Dye | 0 to 250µg L-1 0 to 250 ppb 0 to 250 ppb |
Further details can be found in the manufacturer's specification sheet.
Litre Meter LMSPFA.05 flowmeter
The LMSPFA.05 is a Pelton Wheel flowmeter designed to monitor water flow rates for pumped systems such as ships' continuous seawater supplies. The instrument can measure low flow rates in the range 0.006 to 0.1 l min-1. The flow through the inlet of the meter is directed onto a rotor, whose rotation rate is directly proportional to the flow rate. A small sensing coil detects ferrites mounted in the flow meter rotor blade tips as they pass. Sapphire bearings are used to reduce friction, while maintaining mechanical robustness.
The LMSPFA series comprises several models that operate in the same manner but have different flow rate ranges and pressure drops.
The specification sheet can be accessed here Litre Meter LMSPFA.
Specifications
| Pressure rating | 40 bar (120 bar optional) |
| Flow range | from 0.004 to 0.06 up to 0.1 to 28 l min-1 |
| Temperature rating | -20 to 70°C |
| Viscosity range | up to 10 cPs |
| Accuracy | ± 2% of actual reading for the top 90% of range ± 0.5% FSD for the bottom 10% of range |
| Repeatibility | ± 0.2% reading over top 90% of range |
LMSPFA model specifications
| Model type | Flow rate range (l min-1) | Pressure drop |
| 003 | 0.004 to 0.06 | 0.18 bar @ 0.03 l min-1 0.7 bar @ 0.06 l min-1 |
| 005 | 0.006 to 0.1 | 0.18 bar @ 0.05 l min-1 0.7 bar @ 0.1 l min-1 |
| 01 | 0.01 to 0.25 | 0.33 bar @ 0.125 l min-1 1.3 bar @ 0.25 l min-1 |
| 05 | 0.02 to 1.3 | 0.18 bar @ 0.65 l min-1 0.74 bar @ 1.3 l min-1 |
| 24 | 0.03 to 4.3 | 0.3 bar @ 2 l min-1 1.2 bar @ 4.3 l min-1 |
| 45 | 0.04 to 6.3 | 0.23 bar @ 3 l min-1 1.3 bar @ 6.3 l min-1 |
| 48 | 0.06 to 8 | 0.3 bar @ 4 l min-1 1.2 bar @ 8 l min-1 |
| 90 | 0.08 to 15 | 0.25 bar @ 9 l min-1 0.7 bar @ 15 l min-1 |
| 220 | 0.1 to 28 | 0.24 bar @ 10 l min-1 1.8 bar @ 28 l min-1 |
SeaBird MicroTSG Thermosalinograph SBE 45
The SBE45 MicroTSG is an externally powered instrument designed for shipboard measurement of temperature and conductivity of pumped near-surface water samples. The instrument can also compute salinity and sound velocity internally.
The MicroTSG comprises a platinum-electrode glass conductivity cell and a stable, pressure-protected thermistor temperature sensor. It also contains an RS-232 port for appending the output of a remote temperature sensor, allowing for direct measurement of sea surface temperature.
The instrument can operate in Polled, Autonomous and Serial Line Sync sampling modes:
- Polled sampling: the instrument takes one sample on command
- Autonomous sampling: the instrument samples at preprogrammed intervals and does not enter quiescence (sleep) state between samples
- Serial Line Sync: a pulse on the serial line causes the instrument to wake up, sample and re-enter quiescent state automatically
Specifications
| Conductivity | Temperature | Salinity | |
|---|---|---|---|
| Range | 0 to 7 Sm-1 | -5 to 35°C | |
| Initial accuracy | 0.0003 Sm-1 | 0.002°C | 0.005 (typical) |
| Resolution | 0.00001 Sm-1 | 0.0001°C | 0.0002 (typical) |
| Typical stability (per month) | 0.0003 Sm-1 | 0.0002°C | 0.003 (typical) |
Further details can be found in the manufacturer's specification sheet.
UK Ocean Acidification (UKOA) RRS James Clark Ross Cruise JR20120601/JR271 Underway Surface Hydrography Instrumentation
The surface hydrography instruments used to collect this dataset are displayed in the table below.
| Manufacturer | Model | Parameter measured |
| Sea Bird Electronics | SBE45 | Thermosalinograph salinity, temperature, conductivity, sound velocity |
| Chelsea Technologies | 10-AU Fluorometer | Chlorophyll-a |
| Litre Meter | LMSPFA Flow meter | Flow rate |
UK Ocean Acidification (UKOA) RRS James Clark Ross Cruise JR20120601/JR271 Underway Surface Hydrography Data Processing Document
Originator's Data Processing
The sea surface hydrography measurements were performed by a Sea Bird electronics thermosalinograph in the ship's flow through system and by a temperature sensor located near the flow through intake, at the hull. The depth of the flow through intake was 7 m. The data streams were logged every second to the SCS system and merged into a comma separated file format, and the header information was stored in .TPL files. The surface hydrography data were also logged to the Oceanlogger.ACO file.
The table below shows details of the original files that were delivered to BODC.
| Filename | Content Description | Start Date | Start Time | End Date | End Time |
| oceanlogger.ACO | Temperature, conductivity, salinity, sound velocity, chlorophyll, flow rate and meteorological parameters | 01/06/2012 | 14:40:32 | 05/07/2012 | 13:00:48 |
BODC Data Processing
Reformatting
The underway data were reformatted from the originator's ASCII format to BODC's in-house standard. All parameters were merged into a single file, with a common time channel. Data supplied at higher frequency than the BODC file were bin-averaged to the appropriate time-interval. The channel has an interval of 60 seconds.
The originator's variables were mapped to the appropriate BODC parameter codes as follows:
oceanlogger.ACO
| Originator's Parameter | Originator's Units | Description | BODC Parameter | BODC Units | Comments |
|---|---|---|---|---|---|
| salinity | psu | Practical salinity of the water body by thermosalinograph and computation using UNESCO 1983 algorithm and NO calibration against independent measurements | PSALSU01 | Dimensionless | Channel not transferred, uncalibrated channel. |
| sstemp | °C | Temperature of the water body by thermosalinograph hull sensor and NO verification against independent measurements | TEMPHU01 | °C | Channel not transferred, uncalibrated channel. |
| tstemp | °C | Temperature of the water body by thermosalinograph and NO verification against independent measurements | TEMPSU01 | °C | Channel not transferred, uncalibrated channel. |
| conductivity | S m-1 | Electrical conductivity of the water body by thermosalinograph | CNDCSG01 | S m-1 | |
| sound_velocity | m s-1 | Sound velocity in the water body by thermosalinograph and computation from temperature and salinity by unspecified algorithm | SVELSG01 | m s-1 | |
| chlorophyll | µg l-3 | Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate phase] by through-flow fluorometer plumbed into non-toxic supply and manufacturer's calibration applied | CPHLUMTF | mg chl_a m-3 | |
| flowrate | l min-1 | Flow rate through instrument | INFLTF01 | l min-1 |
Screening
Each data channel was inspected on a graphics workstation and any spikes or periods of dubious data were flagged. The power of the workstation software was used to carry out comparative screening checks between channels by overlaying data channels. A map of the cruise track was simultaneously displayed in order to take account of the oceanographic context.
Sample Calibrations
Calibration against sample data were applied to the temperature and salinity channels.
Temperature
The thermosalinograph hull temperature and the thermosalinograph temperature were interpolated over the time recorded by the CTD. The stainless steel and titanium CTD temperature channels were used to obtain a linear regression to calibrate both of the underway temperature channels.
For the hull temperature, outliers were removed and an r2 value of 0.993 was obtained. The temperature was then corrected using:
| Channel | Calibration Equation |
| Temperature | TEMPHG01 = 0.9853 * TEMPHU01 + 0.2830. |
For the thermosalinograph temperature, once any outliers had been removed, an r2 value of 0.992 was obtained and the temperature was corrected using:
| Channel | Calibration Equation |
| Temperature | TEMPSG01 = 1.0442 * TEMPSU01 - 1.1011 |
Salinity
Only the stainless steel CTD was used to calibrate the underway salinity channel since there were issues when correcting the salinity channel on the titanium CTD. Once outliers had been removed, an r2 value of 0.999 was obtained and the underway system was corrected using:
| Channel | Calibration Equation |
| Salinity | PSALSG01 = 0.9784 * PSALSU01 + 0.7812. |
Project Information
UKOARP Theme B: Ocean acidification impacts on sea surface biology, biogeochemistry and climate
The overall aim of this theme is to obtain a quantitative understanding of the impact of ocean acidification (OA) on the surface ocean biology and ecosystem and on the role of the surface ocean within the overall Earth System.
The aims of the theme are:
- To ascertain the impact of OA on planktonic organisms (in terms of physiological impacts, morphology, population abundances and community composition).
- To quantify the impacts of OA on biogeochemical processes affecting the ocean carbon cycle (both directly and indirectly, such as via availability of bio-limiting nutrients).
- To quantify the impacts of OA on the air-sea flux of climate active gases (DMS and N2O in particular).
The main consortium activities will consist of in-situ measurements on three dedicated cruises, as well as on-deck bioassay experiments probing the response of the in-situ community to elevated CO2. Most of the planned work will be carried out on the three cruises to locations with strong gradients in seawater carbon chemistry and pH; the Arctic Ocean, around the British Isles and the Southern Ocean.
Weblink: http://www.oceanacidification.org.uk/research_programme/surface_ocean.aspx
Data Activity or Cruise Information
Cruise
| Cruise Name | JR20120601 (JR271) |
| Departure Date | 2012-06-01 |
| Arrival Date | 2012-07-02 |
| Principal Scientist(s) | Ray Leakey (Scottish Association for Marine Science) |
| Ship | RRS James Clark Ross |
Complete Cruise Metadata Report is available here
Fixed Station Information
No Fixed Station Information held for the Series
BODC Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
| Flag | Description |
|---|---|
| Blank | Unqualified |
| < | Below detection limit |
| > | In excess of quoted value |
| A | Taxonomic flag for affinis (aff.) |
| B | Beginning of CTD Down/Up Cast |
| C | Taxonomic flag for confer (cf.) |
| D | Thermometric depth |
| E | End of CTD Down/Up Cast |
| G | Non-taxonomic biological characteristic uncertainty |
| H | Extrapolated value |
| I | Taxonomic flag for single species (sp.) |
| K | Improbable value - unknown quality control source |
| L | Improbable value - originator's quality control |
| M | Improbable value - BODC quality control |
| N | Null value |
| O | Improbable value - user quality control |
| P | Trace/calm |
| Q | Indeterminate |
| R | Replacement value |
| S | Estimated value |
| T | Interpolated value |
| U | Uncalibrated |
| W | Control value |
| X | Excessive difference |
SeaDataNet Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
| Flag | Description |
|---|---|
| 0 | no quality control |
| 1 | good value |
| 2 | probably good value |
| 3 | probably bad value |
| 4 | bad value |
| 5 | changed value |
| 6 | value below detection |
| 7 | value in excess |
| 8 | interpolated value |
| 9 | missing value |
| A | value phenomenon uncertain |
| B | nominal value |
| Q | value below limit of quantification |
