Metadata Report for BODC Series Reference Number 1619133
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
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
Instrument Description - SBE19+ CTD Unit
SBE 19+ CTD unit
The under-ice CTD system used during legs 2 and 3 of cruise JR20100613(JR219) was the SBE 19 plus Seacat CTD. The CTD was fitted with the following scientific sensors:
| Sensor | Serial Number | Last calibration date |
|---|---|---|
| Temperature and Conductivity sensor | 5215 | 07 August 2007 |
| Paine strain-gauge pressure sensor | 5215 | 1 August 2007 |
| Wetlabs Wetstar fluorometer | 1359 | 10 May 2010 |
Sea-Bird SBE 19 and SBE 19plus SEACAT Profiler CTDs
The SBE 19 SEACAT Profiler is a self-contained, battery powered, pumped CTD system designed to measure conductivity, temperature, and pressure in marine or fresh water environments to depths of 10,500 meters. It was replaced by the SBE 19plus model in 2001. An updated version of this instrument is the SBE 19plus V2, which incorporates an electronics upgrade and additional features, with six differentially amplified A/D input channels, one RS-232 data input channel, and 64 MB FLASH memory.
The standard CTD unit comes with a plastic housing (rated to 600 m), although this can be replaced by titanium housing for depths up to 7000 m. It is typically used for CTD profiling although a conversion kit is available for mooring deployments. The CTD can also be attached to an SBE 36 CTD Deck Unit and Power/Data Interface Module (PDIM) for real-time operation on single-core armored cable up to 10,000 m.
Specifications
| Parameter | SBE 19 | SBE 19plus |
|---|---|---|
| Temperature | Range: -5 to +35 °C Accuracy: 0.01 °C Resolution: 0.001 °C Calibration: +1 to +32 °C* | Range: -5 to +35 °C Accuracy: 0.005 °C Resolution: 0.0001 °C Calibration: +1 to +32 °C* |
| Conductivity | Range: 0 to 7 S m-1 (0 to 70 mmho cm-1) Accuracy: 0.001 S m-1 Resolution: 0.0001 S m-1 Calibration: 0 to 7 S m-1. Physical calibration over the range 1.4 - 6 S m-1* | Range: 0 to 9 Sm-1 Accuracy: 0.0005 Resolution: 0.00005 (most oceanic waters, resolves 0.4 ppm in salinity); 0.00007 (high salinity waters, resolves 0.4 ppm in salinity); 0.00001 (fresh waters, resolves 0.1 ppm in salinity) Calibration: 0 to 9 S m-1. Physical calibration over the range 1.4 - 6 S m-1* |
| Strain gauge pressure sensor | Range: 0 to100, 150, 300, 500, 1000, 1500, 3000, 5000, 10000 or 15000 psia Accuracy: 0.25% of full scale range (100 - 1500 psia); 0.15% of full scale range (3000 - 15000 psia) Resolution: 0.015% of full scale Calibration: 0 to full scale in 20% steps | Range: 0 to 20, 100, 350, 1000, 2000, 3500 or 7000 m Accuracy: 0.1% of full scale range Resolution: 0.002% of full scale range Calibration: ambient pressure to full scale range in 5 steps |
*Measurements outside this range may be at slightly reduced accuracy due to extrapolation errors.
Options and accessories
Additional sensors can be attached to the CTD, including:
- high accuracy Paroscientific Digiquartz pressure sensor (depth range 0 to 20, 60, 130, 200, 270, 680, 1400, 2000, 4200, 7000 or 10500 m; accuracy 0.02% of full scale; resolution 0.0025% of full scale)
- Dissolved Oxygen (SBE 43 DO Sensor)
- pH* (SBE 18 pH Sensor or SBE 27 pH/ORP Sensor)
- fluorescence
- radiance (PAR)
- light transmission
- optical backscatter (turbidity)
The standard SBE 5M pump may be replaced by an SBE 5P (plastic housing) or 5T (titanium housing) pump for use with dissolved oxygen and/or other pumped sensors. Further details can be found in the manufacturer's SBE 19plus V2 instrument specification or theSBE 19 andSBE 19 plus user guides.
WET Labs WETStar Fluorometers
WET Labs WETStar fluorometers are miniature flow-through fluorometers, designed to measure relative concentrations of chlorophyll, CDOM, uranine, rhodamineWT dye, or phycoerythrin pigment in a sample of water. The sample is pumped through a quartz tube, and excited by a light source tuned to the fluorescence characteristics of the object substance. A photodiode detector measures the portion of the excitation energy that is emitted as fluorescence.
Specifications
By model:
| Chlorophyll WETStar | CDOM WETStar | Uranine WETStar | Rhodamine WETStar | Phycoerythrin WETStar | |
|---|---|---|---|---|---|
| Excitation wavelength | 460 nm | 370 nm | 485 nm | 470 nm | 525 nm |
| Emission wavelength | 695 nm | 460 nm | 530 nm | 590 nm | 575 nm |
| Sensitivity | 0.03 µg l-1 | 0.100 ppb QSD | 1 µg l-1 | - | - |
| Range | 0.03-75 µg l-1 | 0-100 ppb; 0-250 ppb | 0-4000 µg l-1 | - | - |
All models:
| Temperature range | 0-30°C |
|---|---|
| Depth rating | 600 m |
| Response time | 0.17 s analogue; 0.125 s digital |
| Output | 0-5 VDC analogue; 0-4095 counts digital |
Further details can be found in the manufacturer's specification sheet, and in the instrument manual.
BODC Processing
Data Processing
Data arrived at BODC in a total of 11 ASCII files representing the SBE 19+ CTD deployed during cruise JR20100613 (JR219). These files contain one second-bin averaged data including temperature, salinity and fluorometer data.
Reformatting
The lodged ASCII files were reformatted to BODC's internal QXF format.
The CTD cast data collected on 27 June 2010 (event number l31) has not been reformatted by BODC as all data cycles contained negative pressure values. However, the archived file is available upon request.
The following table shows the mapping of variables within the ASCII files to appropriate BODC parameter codes:
| Originator's Variable | Originator's Units | BODC Parameter Code | BODC Units | Comments |
|---|---|---|---|---|
| Scan | - | - | - | Not transferred |
| Date | - | - | - | Not transferred |
| Time | - | - | - | Not transferred |
| Nbin | - | - | - | Not transferred |
| DepSM | - | - | - | Not transferred |
| Pressure | dbar | PRESPR01 | dbar | - |
| Temperature | °C | TEMPST01 | °C | - |
| Conductivity | mS/cm | CNDCST01 | S/m | /10 |
| Salinity | pss-78 | PSALST01 | Dimensionless | Calculated from conductivity sensor measurements by the originator |
| Fluorescence | mg/m3 | CPHLPR01 | mg/m3 | - |
| Sigma-t00 | kg/m-3 | SIGTPR01 | kg m-3 | Not transferred - derived by BODC using POTMCV01, PSALST01 and PRESPR01. |
| - | - | POTMCV01 | °C | Derived by BODC using TEMPST01, PSALST01 and PRESPR01. |
Screening
The reformatted data were visualised using BODC's in-house visualisation software. No data were flagged improbable. Each series was cropped to remove data with negative pressure values at the start and end of the cast.
RRS James Clark Ross Cruise JR20100613 (JR219) SBE 19plus Originator's Processing
Sampling Strategy
A SBE 19plus SEACAT CTD was deployed during leg 2 of the cruise for profiling through the water sampling hole in the ice as well as being used in association with under-ice light sensors for profiles and overnight deployments from the diving hole. In addition the SBE19+ SEACAT CTD was used once during leg 3 of the cruise in association with the light spectrometer and SAtlantics sensors.
Data Processing
Following the completion of each CTD cast the data were saved to the deck unit PC and transferred over the network to a Unix data disk. SeaBird Data Processing V 7.18b software was used to perform all processing steps.
The CTD data was processed according to recommended SeaBird procedures with raw data files being converted to engineering units and binary .CNV files using the DATCNV program. ALIGNCTD was run followed by CELLTM , according to SeaBird's recommendations, to remove conductivity cell thermal mass effects from the measured conductivity. The DERIVE program and TRANSLATE wrote the data to an ASCII output .CNV file. Finally the module BINAVERAGE averaged the data into 1 second-bins.
References
Dumont, E., 2010. CTD Report. Scottish Association for Marine Science.
Available - CTD Report
Project Information
Oceans 2025 Theme 1, Work Package 1.8: Arctic Ocean Climate Change
This Work Package is run by the Proudman Oceanographic Laboratory (POL) and focuses on a modelling evaluation of Arctic Ocean climate change sensitivities. As part of the Rapid Climate Change project, POL has developed an ocean-sea ice model to investigate processes controlling dense water formation and transport in the Barents Sea. The ocean component is the POL Coastal Ocean Modelling System (POLCOMS) and the ice component is the Los Alamos sea ice model (CICE). For Oceans 2025, POL aim to enlarge this model to cover the entire Arctic at a 10km resolution. Work with this model will cover two fronts: (1) investigation of Arctic shelves' role in creating, transforming and redistributing Arctic and North Atlantic water masses; (2) modelling of the rate of sea level change in the Arctic.
The specific objectives are:
- To estimate the sensitivity to climate change of water mass transformation processes and downslope flows in the Arctic Ocean
- To understand the processes responsible for Arctic sea level change
More detailed information on this Work Package is available at pages 24 - 25 of the official Oceans 2025 Theme 1 document: Oceans 2025 Theme 1
Weblink: http://www.oceans2025.org/
Data Activity or Cruise Information
Cruise
| Cruise Name | JR20100613 (JR219) |
| Departure Date | 2010-06-13 |
| Arrival Date | 2010-07-29 |
| 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 |
