Metadata Report for BODC Series Reference Number 1899999
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
Data Description |
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Data Identifiers |
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Time Co-ordinates(UT) |
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Spatial Co-ordinates | |||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Parameters |
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Problem Reports
No Problem Report Found in the Database
ACES-FOCAS James Clark Ross Cruise JR20070226 (JR165, JR170, JR174) Underway Surface Hydrography Data Quality Document
All ChannelsThere are several instances in the time series where the surface underway system was switched off. During these instances, no data have been recorded and the channels are represented by null data flags.
TemperatureSeveral periods where TEMPHU01 was higher than TMESSG01 were identified. However, no flags were applied to these instances.
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.
Kongsberg Seatex Seapath 200 GPS and Gyrocompass
The Seapath 200 is a highly accurate, real-time heading, attitude and position information system that integrates the best signal characteristics of Inertial Measurement Units (IMU) and Global Positioning System (GPS), using a differential GPS method to acquire this data.
The high-rate motion data is obtained from the Seatex MRU5 inertial sensor and two fixed baseline GPS carrier-phase receivers. The raw data is integrated in a Kalman filter in the Seapath Processing Unit. The IMU contains an accurate linear accelerometer and Bosch Coriolis force angular rate gyros (CFG).
This system is equipped to utilise up to six different DGPS reference stations, it checks for consistency within measurements from the different sensors to ensure reliability and rejects noisy data or reports its inaccuracy. The data is available through various output protocols, RS-232, RS-422 and Ethernet.
This instrument is no longer in production; the main characteristics are presented below, and the specification sheet can be accessed here Kongsberg Seatex Seapath 200 .
Specifications
| Scale factor error in pitch, roll and heading | 0.2% RMS |
| Heave motion periods | 1 to 25 s |
| Accuracy | |
| Heading | 0.05° RMS (4 m baseline) 0.075° RMS (2.5 m baseline) |
| Roll and Pitch | 0.03° EMS (± 5° amplitude) |
| Heave | 5 cm or 5%, whichever is highest |
| Position | 0.7 RMS or 1.5 m (95% CEP) with DGPS 0.15 m EMS or 0.4 m (95% CEP) with Searef 100 corrections |
| Velocity | 0.03 m s-1 RMS or 0.07 m s-1 (95% CEP) with DGPS |
Litre Meter flow meter
A flow meter used to monitor water flow rates for pumped systems such as ships' continuous seawater supplies.
RRS James Clark Ross Cruise JR20070226 (JR165, JR170, JR174) Surface Hydrography Instrumentation
Sea surface temperature is measured by a probe mounted near the hull, close to the entry point for the uncontaminated water supply and by a thermosalinograph located in the ship's prep room. All other parameters are measured by instruments also located on the ship's prep room.
| Manufacturer | Model | Function | Comments |
| SeaBird Electronics | SBE45 CTD | Surface hydrography | |
| Turner Designs | 10-AU Fluorometer | Chlorophyll fluorescence | |
| Litre Meter | Flow meter | Flow rate | |
| SeaBird Electronics | SBE 48 | Hull temperature sensor |
Sea-Bird SBE 48 Hull Temperature Sensor
The SBE 48 is a high-accuracy temperature recorder with non-volatile memory, designed for shipboard determination of sea surface temperature. Mounted with magnets just below the water line, the SBE 48's temperature sensor is in contact with the inside of the ship's hull. The SBE 48's internal battery runs the real-time clock and can be used to power the instrument for very short deployments; external power is recommended for typical deployments.
Data are recorded in memory and can also be output in real-time in engineering units. Memory capacity exceeds 4.7 million samples of temperature and time; this yields approximately 54 days of data when sampling every 1 sec.
Specifications
| Range | -5 to +35 °C |
|---|---|
| Initial accuracy | ± 0.002°C |
| Resolution | 0.0001 °C |
| Typical stability (per month) | 0.0002 °C |
| Sampling Speed | Approximately 1 Hz (1 sample/sec), or user-programmable 3-sec to 9-hour intervals |
| Memory | 4.7 million samples (temperature and time) |
Further details can be found in the manufacturer's specification sheet.
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.
ACES-FOCAS Cruise RRS James Clark Ross JR20070226 (JR165, JR170, JR174) Underway Surface Hydrography Procedures Processing Document
Originator's Data Processing
One file with processed data was received at BODC. Data collection started on 26 February 2007 12:48 hours and ended on 17 April 2007 20:12 hours.
Processing did not take place during the cruise, the only procedures implemented consisted of data retrieval from the previous 24h and logging those into subdirectories on the ship's intranet system.
The sea surface hydrography measurements were performed by a number of instruments connected to the ship's flow through system and a temperature sensor located near the flow through intake, at the hull, at 7 m depth.
The originator sent one file containing the sea surface data: Surface temperature by the thermosalinograph and hull sensor, chlorophyll, salinity, conductivity, sound velocity and pump flow rate.
The processing procedures carried out by the originator include:
- check for duplicate dates and times
- standardising time
- check for gaps in data
- check data against defined thresholds
- flagging
- unit conversion
Files delivered to BODC
| Filename | Content description | Format | Interval | Start date/time (UTC) | End date/time (UTC) | Comments |
| jr177_ocl_exactsec | Surface hydrography | txt | 5s | 26/02/2007 12:48:48 | 17/04/2007 20:12:12 | Data processed by the originator |
BODC Data Processing
All sea surface hydrography parameters, were transferred to internal QXF format and matched against BODC codes, as presented in the table below. There was no need to apply unit conversions as the originator's units were similar to the units described on the BODC parameter dictionary.
BODC processing procedures included loading of data and reduction through averaging, visual screening and flagging of anomalous values.
The originator's variables were mapped to appropriate BODC parameter codes as follows:
jr177_ocl_exactsec
| Originator's variable | Originator's units | BODC code | BODC units | Comments |
| ThermoSalTemp | degrees C | TMESSG01 | degrees C | Hull sensor |
| SStemp | degrees C | TEMPHU01 | degrees C | Remote sensor |
| Chloro | µg l-1 | CPHLUMTF | mg m-3 | Equivalent units |
| Salinity | - | PSALSU01 | dimensionless | |
| Cond | s m-1 | CNDCSG01 | s m-1 | |
| Sound Velocity | m s-1 | SVELSG01 | m s-1 | |
| FlowRate | l min-1 | INFLTF01 | l min-1 |
Surface hydrography data were screened using Edserplo and N flags applied to absent data. Several periods where TEMPHU01 was higher than TMESSG01 were identified. No flags were applied to these instances.
Project Information
ACES- Antarctic Climate and the Earth System
Introduction
This project is part of the BAS GSAC five year research programme. It was funded by NERC and extended from 2005 to 2009.
ACES aims to investigate the atmospheric and oceanic links that connect the climate of the Antarctic to that of lower latitudes, and their controlling mechanisms. Specific research topics include the formation and properties of Antarctic clouds, the complexities of the atmospheric boundary layer and the importance to the global ocean circulation of cold, dense water masses generated in the Antarctic.
Data will be collected by a comprehensive programme of oceanographic measurements from BAS ships in the Weddell and Bellingshausen Seas and by the Twin Otter aircraft, which will allow for the study of cloud microphysics and air-sea-ice interaction. An ice core will be collected from the southwestern Antarctic Peninsula and will give a 150-year record of the strength of the circumpolar westerly winds. This data will be used to test and improve global climate models and a new regional atmosphere-ice-ocean model for the Antarctic.
ACES has two components: ACES-FOCAS (Forcings from the Ocean, Clouds, Atmosphere and Sea-ice) and ACES-ACCENT (Antarctic Climate Change and Nonlinear Teleconnections). It also links with several other projects: CACHE, GRADES, GEACEP, BIOFLAME, DISCOVERY2010 and SEC.
Scientific Objectives
The main objectives are:
- Understand the interactions between atmosphere, sea-ice and ocean at high southern latitudes
- Develop models to aid our understanding of Antarctic regional processes and enable the representation of essential regional phenomena in global models covering both the atmosphere and ocean
- Determine the nature and influence of the principal connections between Antarctica and the global climate system
- Determine the importance of water masses of Antarctic origin in the global ocean circulation
- Determine the sensitivity of the global climate system to processes occurring or originating in the Antarctic
Data Availability
Data sets collected during this project are available to the academic community.
Acronyms used in this text:
BAS- British Antarctic Survey
GSAC- Global Science in an Antarctic Context
NERC- Natural Environment Research CouncilCACHE- Climate and Chemistry: forcings , feedbacks and phasings in the Earth System
GRADES- Glacial retreat in Antarctica and Deglaciation of the Earth System
GEACEP- Greenhouse to ice-house: Evolution of the Antarctic Cryosphere and Paleoenvironment
BIOFLAME- Biodiversity, Function, Limits and Adaptation from Molecules to Ecosystems
DISCOVERY2010- Integrating Southern Ocean Ecosystems into the Earth System
SEC- Sun Earth Connections Programme
Data Activity or Cruise Information
Cruise
| Cruise Name | JR20070226 (JR165, JR170, JR174) |
| Departure Date | 2007-02-26 |
| Arrival Date | 2007-04-16 |
| Principal Scientist(s) | Deborah Shoosmith (British Antarctic Survey), Keith Weston (University of East Anglia School of Environmental Sciences), Mark Brandon (Open University Department of Earth and Environmental Sciences) |
| 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 |
