Metadata Report for BODC Series Reference Number 1763332
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
Light sensors
The TIR sensors were not working correctly and were reporting unrealistic values. A new TIR system was built early 2016 on the JCR and was experiencing teething problems resulting in the anomalous values.
RRS James Clark Ross Cruise JR15007 Meteorology Data Quality Document
Wind sensors
Some drops or spikes in absolute wind speed were recorded during changes in the ship's heading and when the relative wind direction was at 180 degrees. This strongly suggests a temporary shielding of the anemometer, and the data were therefore flagged. A large number of spikes in the true wind direction were detected and flagged accordingly.
Air temperature, relative humidity and atmospheric pressure
There was good agreement between the two sensors for each of pressure, air temperature and relative humidity. There were some instances showing the influence of heading (and hence the ship's infrastructure) on the values of these channels which were flagged. Clear spikes in the data were flagged as unrealistic.
Light sensors
Overall, there was good agreement between both of the PAR sensor readings and the range of values appeared appropriate.
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
Kipp & Zonen Photosynthetically Active Radiation Quantum Sensor PQS1
The PQS1 is an atmospheric radiometer designed to measure incident radiation at photosynthetically active radiation (PAR) wavelengths. It incorporates a diffuser with an excellent directional (cosine) response and a silicon photodiode detector.
If used in field research applications, the PQS1 can be connected with the METEON handheld display unit, which also as data-logging capability. For permanent installations, it can be connected to the LOGBOX SD data logger.
Specifications
Spectral range | 400 to 700 nm (± 4 nm) |
Sensitivity | 4 to 10 µV µmol-1 m-2 s-1 |
Response time | < 1 µs |
Non linearity | < 1% (0 to 10000 µV µmol-1 m-2 s-1) |
Temperature dependence | < -0.1% °C-1 |
Sensitivity change per year | < 2% |
Directional error | < 3% (up to 80° zenith angle) |
Field of view | 180° |
Operating temperature | -30 to 70°C |
Relative humidity | 0 to 100 % RH |
A link to the PQS1 specification sheet can be found here: PQS1 Spec sheet
Kipp and Zonen SP Lite and SP Lite2 Silicon Pyranometer
An atmospheric pyranometer that measures solar radiation over the range 400-1100 nm by means of a silicon photo-diode detector mounted in a diffuser. The sensor measures the radiation received over the entire hemisphere and the diffuser's sensitivity is proportional to the cosine of the angle of incidence of the incoming radiation. The photodiode creates a voltage output that is proportional to the incoming radiation. The SP Lite2 supersedes the SP Lite and features an improved sensitivity and faster response time than its predecessor.
Specifications
Specification | SP Lite | SP Lite2 |
---|---|---|
Spectral range | 400-1100 nm | 400-1100 nm |
Sensitivity | 100 µV W-1 m-2 | 60 to 100 µV W-1 m-2 |
Response time | < 1 s | < 500 ns |
Maximum irradiance | 2000 W m-2 | 2000 W m-2 |
Operating temperature | -30 to 70°C | -30 to 70°C |
Temperature dependence | 0.15% °C-1 | 0.15% °C-1 |
Further details can be found in the manufacturer's specification sheets for the SP Lite and SP Lite2.
RRS James Clark Ross Cruise JR15007 Meteorology Instrument Description Document
The meteorological suite of sensors is located on the bow at 22 m height. The instruments used to collect this dataset are displayed in the table below.
Manufacturer | Model | Main Function | Serial number | Last calibration date |
Kipp and Zonen (sensor 1) | SPLite 2 | Total Incident Radiation (TIR) | 112993 | 26/01/2011 |
Kipp and Zonen (sensor 2) | SPLite 2 | Total Incident Radiation (TIR) | 112992 | 01/06/2015 |
Kipp and Zonen (sensor 1) | Proto Quantum Spectra 1 (PQS1) | Photosynthetically Active Radiation (PAR) | 110127 | 05/01/2011 |
Kipp and Zonen (sensor 2) | Proto Quantum Spectra 1 (PQS1) | Photosynthetically Active Radiation (PAR) | 110126 | 05/01/2011 |
Rotronic | MP402H-050300 | Air temperature and relative humidity (port) | 0060743898 | 27/04/2011 |
Rotronic | MP402H-050300 | Air temperature and relative humidity (starboard) | 0060743896 | 27/04/2011 |
Vaisala | PTB210 Class B | Digital barometer | V1450003 | 10/04/2000 |
Vaisala | PTB210 Class B | Digital barometer | V1450002 | 10/04/2000 |
Windobserver | 70 | Anemometer | - | - |
Rotronic Hygromet MP102H and MP402H temperature and humidity probes
This meteorological probe measures humidity and temperature with the plug-in HygroClip HC2-S3 sensor module, and can also be equipped with a signal conditioned Pt100 temperature probe.
The two models differ in that the MP102H produces a voltage output while the MP402H produces a current output. Other characteristics are common to both models.
The specification sheet can be accessed here Rotronic MP102H and MP402H.
Specifications
Start up time | 3 s (typical) |
Data refresh time | 1 s (typical) |
Humidity range | 0 to 100% RH |
Humidity accuracy | 0.8% RH |
Temperature range | -40 to 80°C |
Temperature accuracy | 0.1°C |
Maximum air velocity ar probe | 20 m s-1 |
User configurable limits | -999 to 9999 engineering units |
HC2-S3 Probe material | Polycarbonate |
Probe dust filter | Polyethylene |
Vaisala PTB210 Digital Barometer
The basic specifications for this pressure sensor are as follows:
- Manufacturer: Vaisala
- Type: Silicon capacitive sensor
- Model: PTB210
- Range: 900 - 1100 hPa
- Output: 0-5VDC
- Total Accuracy (20°C): ±0.30hPa
- Operating temperature: -40 to +60 deg C
- Weight: 110g
- Certification Ingress Protection: IP65
Further details can be found in the manufacturer's specification sheet.
RRS James Clark Ross Cruise JR15007 Meteorology Processing Procedures Document
Originator's Data Processing
Meterological data were measured from instruments located on the RRS James Clark Ross meterological mast. The data streams were logged every second to the SCS system and merged into comma separated file formats (.ACO). The instruments logged the meterological data to the oceanlogger and anemometer ACO files and the header information was stored in the corresponding .TPL files. The start and end times of the meterological files are shown in the table below.
Filename | Content Discription | Format | Interval | Start date | Start Time | End date | End Time |
oceanlogger.ACO |
| ASCII (.ACO) | ~5 sec | 25/05/2016 | 17:21:19 | 10/07/2016 | 12:12:54 |
Anemometer.ACO | Relative wind speed and direction | ASCII (.ACO) | ~1 sec | 25/05/2016 | 17:21:16 | 10/07/2016 | 14:10:53 |
BODC Data Processing
The files were reformatted to BODC internal format using standard data banking procedures. All files were averaged to 60 second intervals. The following table shows how the variables within the files were mapped to appropriate BODC parameter codes.
Originator's File | Originator's Parameter | Originator's Units | Description | BODC parameter | BODC Units | Comments and unit conversions |
oceanlogger.ACO | baro1 | hPa | Pressure (measured variable) exerted by the atmosphere by barometer and expressed at measurement altitude | CAPHTU01 | mbar | Units are equivalent |
oceanlogger.ACO | baro2 | hPa | Pressure (measured variable second sensor) exerted by the atmosphere by barometer and expressed at measurement altitude | CAPHTU02 | mbar | Units are equivalent |
oceanlogger.ACO | airtemp1 | °C | Temperature (second sensor) of the atmosphere by dry bulb thermometer | CDTAZZ01 | °C | - |
oceanlogger.ACO | airtemp2 | °C | Temperature (second sensor) of the atmosphere by dry bulb thermometer | CDTAZZ02 | °C | - |
oceanlogger.ACO | humidity1 | % | Relative humidity (second sensor) of the atmosphere | CRELZZ01 | % | - |
oceanlogger.ACO | humidity2 | % | Relative humidity (second sensor) of the atmosphere | CRELZZ02 | % | - |
oceanlogger.ACO | par1 | µmol m-2 s-1 | Downwelling vector irradiance as photons (PAR wavelengths) in the atmosphere by cosine-collector radiometer | IRRDSV01 | µE m-2 s-1 | Units are equivalent |
oceanlogger.ACO | par2 | µmol m-2 s-1 | Downwelling vector irradiance as photons (PAR wavelengths) in the atmosphere by cosine-collector radiometer | PARERXSD | µE m-2 s-1 | Units are equivalent |
oceanlogger.ACO | tir1 | W m-2 | Downwelling vector irradiance as energy (solar (300-3000 nm) wavelengths) in the atmosphere by pyranometer | CSLRR101 | W m-2 | Dropped after transfer due to poor quality. |
oceanlogger.ACO | tir2 | W m-2 | Downwelling vector irradiance as energy (solar (300-3000 nm) wavelengths) in the atmosphere by pyranometer | CSLRR102 | W m-2 | Dropped after transfer due to poor quality |
anemometer.ACO | wind_dir | Degrees | Wind direction (relative to moving platform) in the atmosphere by in-situ anemometer | ERWDSS01 | Degrees | - |
anemometer.ACO | wind_speed | m s-1 | Wind speed (relative to moving platform) in the atmosphere by in-situ anemometer | ERWSSS01 | m s-1 | - |
- | - | - | Wind speed in the atmosphere by in-situ anemometer | EWSBSS01 | m s-1 | Channel derived using BODC Matlab routine 'wincor' |
- | - | - | Wind direction in the atmosphere by in-situ anemometer | EWDASS01 | Degrees true | Channel derived using BODC Matlab routine 'wincor' |
Wind sensors
The BODC Matlab procedure 'wincor' was run using the relative wind speed and direction and ship's north-south and east-west velocities, with the vane set to 0 degrees at the bow. This program generated the absolute wind speed and direction.
Calibrations
Field calibrations
No sample calibrations were applied to the meteorological data.
Manufacturers calibrations
Irradiance channels (PAR and TIR)
A calibration was applied to the PAR irradiance channels to take the average of the 2 sensors as they are located side by side on the JCR. No calibration was applied to the TIR sensors as they were recording unreliable data.
Project Information
A nutrient and carbon pump over mid-ocean ridges (RidgeMix)
RidgeMix is a five year (August 2014 to February 2019) research programme which received funding from the Natural Environment Research Council (NERC). The aim of the programme was to address the problem of how deep nutrients are transported into the surface waters in mid-latitudes, by testing a new view: tides passing over the mid-Atlantic ridge generate enhanced turbulence and mixing, which in turn provides a nutrient supply to the upper thermocline waters. These nutrients are then transported horizontally along density surfaces over the western side of the basin, probably being swept along the Gulf Stream and eventually passing into the winter mixed surface layer. When this surface layer shallows and warms in spring, the nutrients are then available to the phytoplankton.
Fieldwork involved collecting measurements of the turbulence and nutrient concentrations over and adjacent to the Mid-Atlantic Ridge, using a novel long-term moored array of instruments along the ridge, deployed over a five-week research cruise. Sampling was done sufficiently quickly to resolve tidal changes in currents and mixing over the ridge. A second component of the fieldwork will use computer models of circulation in the Atlantic to explore the wider implications of the fieldwork observations, to determine whether or not mixing over the mid-Atlantic ridge really does provide enough nutrients to explain the phytoplankton production in the mid-latitude North Atlantic.
RidgeMix was a collaborative project involving five organisations, of which three were UK based and two were US based. The project was led by the Professor Jonathan Sharples, University of Liverpool, Earth, Ocean and Ecological Sciences. Collaborators were:
Data Activity or Cruise Information
Cruise
Cruise Name | JR15007 |
Departure Date | 2016-05-25 |
Arrival Date | 2016-07-10 |
Principal Scientist(s) | Jonathan Sharples (National Oceanography Centre, Liverpool) |
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 |