Metadata Report for BODC Series Reference Number 1359875
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
RRS Discovery AMT15 (D284) - Continuous Underway Meteorology Processing Document
Originator's Data Processing
RRS Discovery is fitted with a central data logging system known as the ABC system. All available data streams from the ABC were collected. Most data streams have a one second sample interval with the exception of surfmet (30s) and ea500d1 (ping interval). ASCII listings were produced for all ABC system data streams.
The data archive was distributed to the PSO and BODC on DVD with compression of some datasets, notably processed CTD data and all the ABC data. A backup copy of the DVD was left onboard the ship, also one backup was taken back to UKORS. Approximately eight Gigabytes of data were acquired including processed data.
BODC Data Processing
Reformatting
Data from the full-resolution RVS files were transferred to BODC's NetCDF format (QXF) under the BODC Underway Data System (BUDS). This transfer involved reducing the data to 60 second intervals using averaging. Directional data were reduced by averaging using a unit circle.
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.
Data processing, correction and calibration
Relative wind speed and direction were logged from the meteorological package during the cruise. The anemometer was positioned with 0 degrees at the ship's bow. The ship's speed relative to the ground was calculated at BODC using the ship's navigational information and the ship's heading. The speed and heading were then used to correct the wind data for the effect of the ship's movement. Absolute wind speed and direction channels were created.
RRS Discovery AMT15 (D284) - Continuous Underway Meteorology Data Quality Report
Data Quality Report
The Total Irradiance (TIR) channels remain in their raw [volts] format as the manufacturer's calibration coefficients were not received.
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 and Zonen Pyranometer Model CM6B
The CM6B pyranometer is intended for routine global solar radiation measurement research on a level surface. The CM6B features a sixty-four thermocouple junction (series connected) sensing element. The sensing element is coated with a highly stable carbon based non-organic coating, which delivers excellent spectral absorption and long term stability characteristics. The sensing element is housed under two concentric fitting Schott K5 glass domes.
Specifications
Dimensions (W x H) | 150.0 mm x 91.5 mm |
---|---|
Weight | 850 grams |
Operating Temperature | -40°C to +80°C |
Spectral Range | 305 - 2800 nm (50% points) |
Sensitivity | 9 -15 µV/W/m2 |
Impedance (nominal) | 70 - 100 ohm |
Response Time (95%) | 30 sec |
Non-linearity | < ± 1.2% (<1000 W/m2) |
Temperature dependence of sensitivity | < ± 2% (-10 to +40°C) |
Zero-offset due to temperature changes | < ± 4 W/m2 at 5 K/h temperature change |
Vaisala Analog Barometers Models PTB100 (A), (B) and PTB101 (B), (C)
The PTB 100 series analog barometers are designed both for accurate barometric measurements at room temperature and for general environmental pressure monitoring over a wide temperature range. The long-term stability of the barometer minimizes the need for field adjustment in many applications.
Physical Specifications
Size | 97 x 60 x 22 mm |
---|---|
Weight | 85g |
The barometers use the BAROCAP* silicon capacitive absolute pressure sensor developed by Vaisala for barometric pressure measurements. The BAROCAP* sensor combines the elasticity characteristics and mechanical stability of a single-crystal silicon with the proven capacitive detection principle.
Sensor Specifications
Model Number | Pressure Range (mbar) | Temperature Range (°C) | Humidity Range | Total Accuracy | |
---|---|---|---|---|---|
PTB100A | 800 to 1060 | -40 to +60 | non-condensing | +20 °C | ± 0.3 mbar |
0 to +40 °C | ± 1.0 mbar | ||||
-20 to +45 °C | ± 1.5 mbar | ||||
-40 to +60 °C | ± 2.5 mbar | ||||
PTB100B | 600 to 1060 | -40 to +60 | non-condensing | +20 °C | ± 0.5 mbar |
0 to +40 °C | ± 1.5 mbar | ||||
-20 to +45 °C | ± 2.0 mbar | ||||
-40 to +60 °C | ± 3.0 mbar | ||||
PTB101B | 600 to 1060 | -40 to +60 | non-condensing | +20 °C | ± 0.5 mbar |
0 to +40 °C | ± 1.5 mbar | ||||
-20 to +45 °C | ± 2.0 mbar | ||||
-40 to +60 °C | ± 3.0 mbar | ||||
PTB101C | 900 to 1100 | -40 to +60 | non-condensing | +20 °C | ± 0.3 mbar |
0 to +40 °C | ± 1.0 mbar | ||||
-20 to +45 °C | ± 1.5 mbar | ||||
-40 to +60 °C | ± 2.5 mbar |
* BAROCAP is a registered trademark of Vaisala
Vaisala Temperature and Relative Humidity HMP Sensors
A family of sensors and instruments (sensors plus integral displays or loggers) for the measurement of air temperature and relative humidity. All are based on a probe containing a patent (HUMICAP) capacitive thin polymer film capacitanece humidity sensor and a Pt100 platinum resistance thermometer. The probes are available with a wide range of packaging, cabling and interface options all of which have designations of the form HMPnn or HMPnnn such as HMP45 and HMP230. Vaisala sensors are incorporated into weather stations and marketed by Campbell Scientific.
All versions operate at up to 100% humidity. Operating temperature ranges vary between models, allowing users to select the version best suited to their requirements.
Further details can be found in the manufacturer's specification sheets for the HMP 45 series, HMP 70 series and HMP 230 series.
Vaisala WA15 Wind Set
The WAA151 combines a WAA151 anemometer and a WAV151 wind vane, to measure wind speed and direction.
WAA151 Anemometer
The anemometer has three lightweight conical cups in the cup wheel. A wind-rotated chopper disc, attached to the cup wheel's shaft, cuts an infrared light beam 14 times per revolution, generating a pulse output from a phototransistor. The output rate can be regarded as directly proportional to the wind speed. However, for the best accuracy, a transfer function is used to compensate starting inertia and slight over-speeding:
Uf = 0.328 + 0.101 x R, where Uf = wind speed and R = output pulse rate
A thermostatically controlled heating element in the shaft tunnel prevents the bearings from freezing in cold environments.
WAV151 Wind Vane
The WAV151 is a counter-balanced optelectronic wind vane. Infrared LEDs and phototransistors are mounted in six orbits around a 6 bit Gray coded disc. Turned by the vane, the disc determines the code received by the phototransistors.
Specifications
WAA151 Anemometer | WAV151 Wind Vane | |
---|---|---|
Measurement range | 0.4-75 m s-1 | 0-300° (at 0.4-75 m s-1) |
Starting threshold | < 0.5 m s-1 | < 0.4 m s-1 |
Resolution | - | ±2.8° |
Accuracy | ±0.17 m s-1 (within range 0.4-60 m s-1) | < ± 3° |
Output | 0-750 Hz square wave | 6 bit parallel Gray code |
Operating temperature | -50°C to 55°C | -50°C to 55°C |
Further details can be found in the manufacturer's specification document.
Trimble 4000DS Global Positioning System receiver
The Trimble 4000DS Differential Surveyor is similar to the 4000RS (a Maxwell-based receiver that is oriented toward precision positioning applications. It is intended for use as a DGPS base station, generating RTCM-104 corrections). The 4000Ds can apply RTCM-104 corrections to the satellite data it receives in order to generate accurate position fixes in real time.
Didcot Cosine Photosynthetically Available Radiation (PAR) sensors
The silicon cell, blue glass filter and diffuser are bond together using optically clear adhesive, the complete assembly is mounted into the black anodised body and sealed using the same adhesive. The body has a raised rim to provide to provide low angle cosine correction and holes within the rim to provide drainage for surface water which would otherwise affect the instrument's accuracy. Model DRP-5 has an integral clamp to mount on a vertical mast tube, model DRP-5B has round base with three leveling screws and is intended to stand on a flat surface and model DRP-4 has a built in integrator to record total PAR received over a period of time.
Technical Information
Sensor Reference | DRP-5 | DRP-5B | DRP-4 |
---|---|---|---|
Spectral Range (µm) | 0.35 to 0.7 | 0.35 to 0.7 | 0.35 to 0.7 |
Cosine error at 10° (%) | ± 3 | ± 3 | ± 3 |
Typical Output at 1kW/m2 (mV) | 12.00 | 12.00 | integrator |
Resolution | 2 W/m2 | 2 W/m2 | 1 W/h/m2 |
Response Time to 63% (sec) | 0.01 | 0.01 | 0.01 |
Temperature Range (°C) | -40 to 70 | -40 to 70 | -20 to 70 |
RRS Discovery AMT15 (D284) - Continuous Underway Meteorology Instrumentation Document
Instrumentation
Manufacturer | Model | Main Function | Serial Number | Comments |
---|---|---|---|---|
Trimble | 4000DS | Position (Latitude and Longitude) | - | - |
Vaisala | Anemometer WAA151 | Wind speed | PA50421 | |
Vaisala | Wind vane WAV151 | Wind direction | - | |
Vaisala | HMP44L | Temperature/Humidity | - | |
Vaisala | PTB100A | Pressure | - | |
Kipp & Zonen | CMB6 | TIR | - | Port and Starboard. |
Didcot/ELE | DRP-5 | PAR | - | Port and Starboard. |
Project Information
The Atlantic Meridional Transect - Phase 2 (2002-2006)
Who was involved in the project?
The Atlantic Meridional Transect Phase 2 was designed by and implemented by a number of UK research centres and universities. The programme was hosted by Plymouth Marine Laboratory in collaboration with the National Oceanography Centre, Southampton. The universities involved were:
- University of Liverpool
- University of Newcastle
- University of Plymouth
- University of Southampton
- University of East Anglia
What was the project about?
AMT began in 1995, with scientific aims to assess mesoscale to basin scale phytoplankton processes, the functional interpretation of bio-optical signatures and the seasonal, regional and latitudinal variations in mesozooplankton dynamics. In 2002, when the programme restarted, the scientific aims were broadened to address a suite of cross-disciplinary questions concerning ocean plankton ecology and biogeochemistry and the links to atmospheric processes.
The objectives included the determination of:
- how the structure, functional properties and trophic status of the major planktonic ecosystems vary in space and time
- how physical processes control the rates of nutrient supply to the planktonic ecosystem
- how atmosphere-ocean exchange and photo-degradation influence the formation and fate of organic matter
The data were collected with the aim of being distributed for use in the development of models to describe the interactions between the global climate system and ocean biogeochemistry.
When was the project active?
The second phase of funding allowed the project to continue for the period 2002 to 2006 and consisted of six research cruises. The first phase of the AMT programme ran from 1995 to 2000.
Brief summary of the project fieldwork/data
The fieldwork on the first three cruises was carried out along transects from the UK to the Falkland Islands in September and from the Falkland Islands to the UK in April. The last three cruises followed a cruise track between the UK and South Africa, only deviating from the traditional transect in the southern hemisphere. During this phase the research cruises sampled further into the centre of the North and South Atlantic Ocean and also along the north-west coast of Africa where upwelled nutrient rich water is known to provide a significant source of climatically important gases.
Who funded the project?
Natural Environment Research Council (NERC)
Data Activity or Cruise Information
Cruise
Cruise Name | D284 (AMT15) |
Departure Date | 2004-09-17 |
Arrival Date | 2004-10-29 |
Principal Scientist(s) | Andrew Rees (Plymouth Marine Laboratory) |
Ship | RRS Discovery |
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 |