Metadata Report for BODC Series Reference Number 617651


Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
NameCategories
Sea-Bird SBE 19 SEACAT CTD  CTD; water temperature sensor; salinity sensor
Seapoint chlorophyll fluorometer  fluorometers
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Bill Turrell
Originating Organization Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -
 

Data Identifiers

Originator's Identifier SC06/02/241
BODC Series Reference 617651
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2002-04-17 15:01
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 1.0 decibars
 

Spatial Co-ordinates

Latitude 56.96250 N ( 56° 57.8' N )
Longitude 1.85770 W ( 1° 51.5' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 0.99 m
Maximum Sensor or Sampling Depth 114.9 m
Minimum Sensor or Sampling Height 2.1 m
Maximum Sensor or Sampling Height 116.01 m
Sea Floor Depth 117.0 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor or Sampling Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODERankUnitsTitle
CNDCST011Siemens per metreElectrical conductivity of the water body by CTD
CPHLPR011Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >unknown phase] by in-situ chlorophyll fluorometer
FVLTWS011VoltsVoltage of instrument output by linear-response chlorophyll fluorometer
PRESPR011DecibarsPressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected to read zero at sea level
PSALST011DimensionlessPractical salinity of the water body by CTD and computation using UNESCO 1983 algorithm
SIGTEQ011Kilograms per cubic metreSigma-theta of the water body by computation from salinity and potential temperature using UNESCO algorithm
TEMPST011Degrees CelsiusTemperature of the water body by CTD or STD

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

Problem Reports

No Problem Report Found in the Database


Data Access Policy

Public domain data

These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

The recommended acknowledgment is

"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."


Narrative Documents

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:

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.

Seapoint Chlorophyll Fluorometer

The Seapoint Chlorophyll Fluorometer (SCF) is a low power instrument for in situ measurements of chlorophyll a. The SCF uses modulated blue LED lamps and a blue excitation filter to excite chlorophyll a. The fluorescent light emitted by the chlorophyll a passes through a red emission filter and is detected by a silicon photodiode. The low level signal is then processed using synchronous demodulation circuitry which generates an output voltage proportional to chlorophyll a concentration. The SCF may be operated with or without a pump.

Sensor specifications, current at August 2006, are given in the table below. More information can be found at the manufacturer's web site.

Sensor Specifications

Power requirements 8 - 20 VDC, 15 mA avg., 27 mA pk.
Output 0 - 5.0 VDC
Output Time Constant 0.1 sec.
Power-up transient period < 1 sec.
Excitation Wavelength 470 nm CWL, 30 nm FWHM
Emission Wavelength 685 nm CWL, 30 nm FWHM
Sensing Volume 340 mm3
Minimum Detectable Level 0.02 µg l-1

  Gain Sensitivity, V µg-1 l-1 Range, µg l-1
Sensitivity/Range 30x
10x
3x
1x
1.0
0.33
0.1
0.033
5
15
50
150

RV Scotia 06/2002 CTD Data Documentation

Instrumentation

The instrument used was a Sea-Bird SBE19 SEACAT.

Details of the sensors on the CTD are -

Manufacturer Sensor Serial No. Manufacturer Cal. Date Sensor Units
Sea-Bird Pressure 2304 14 Sep 2001 Decibars
Sea-Bird Temperature 2304 08 Sep 2001 Centigrade
Sea-Bird Conductivity 2304 08 Sep 2001 Siemens/meter
Seapoint Fluorometer 2048 25 Sep 2001 Volts
C-Star Transmissometer CST-504PR 19 Sep 2001 Volts

Calibrations

Parameter Value of m (y=mx+c) Value of c (y=mx+c) Equation
Pressure 1.000000 0.000000 P(cal) = P(obs)
Temperature 1.000000 0.000000 T(cal) = T(obs)
Conductivity 1.045070 -1.545900 C(cal) = 1.045070C(obs) + -1.545900
Fluorescence 0.000518 0.204673 Chlor.(cal)(ug/l) = 0.000518F(obs)(volts) + 0.204673
Beam Attenuation 1.000000 0.000000 B(cal) = B(obs)

Data Quality Information

In general the data appears to be good. The attenuance channel has been deleted from all stations on this cruise as the data were considered suspect by both FRS and BODC. The values ranged from <1 volt to >9 volts between individual stations as well as within the same station on occasion. FRS have put this down to there possibly being a malfunction in the transmissometer as the meter was later sent away for calibrating and servicing (May 2003) and any data recorded after this point appears to be acceptable. There are a few spikes in the chlorophyll channels which have also been flagged. Station 268 has been deleted as the instrument was not switched on prior to deployment. Note that FRS have edited both the temperature and conductivity channels.

General Data Screening carried out by BODC

BODC screen both the series header qualifying information and the parameter values in the data cycles themselves.

Header information is inspected for:

Documents are written by BODC highlighting irregularities which cannot be resolved.

Data cycles are inspected using time or depth series plots of all parameters. Currents are additionally inspected using vector scatter plots and time series plots of North and East velocity components. These presentations undergo intrinsic and extrinsic screening to detect infeasible values within the data cycles themselves and inconsistencies as seen when comparing characteristics of adjacent data sets displaced with respect to depth, position or time. Values suspected of being of non-oceanographic origin may be tagged with the BODC flag denoting suspect value; the data values will not be altered.

The following types of irregularity, each relying on visual detection in the plot, are amongst those which may be flagged as suspect:

If a large percentage of the data is affected by irregularities then a Problem Report will be written rather than flagging the individual suspect values. Problem Reports are also used to highlight irregularities seen in the graphical data presentations.

Inconsistencies between the characteristics of the data set and those of its neighbours are sought and, where necessary, documented. This covers inconsistencies such as the following:

This intrinsic and extrinsic screening of the parameter values seeks to confirm the qualifying information and the source laboratory's comments on the series. In screening and collating information, every care is taken to ensure that errors of BODC making are not introduced.


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Cruise

Cruise Name 0602S
Departure Date 2002-04-09
Arrival Date 2002-04-23
Principal Scientist(s)Iain M Gibb (Fisheries Research Services Aberdeen Marine Laboratory)
Ship FRV Scotia

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameStonehaven line
CategoryOffshore route/traverse

Stonehaven Line

Stonehaven Line

Listed below are details of the standard stations that form the Stonehaven Line sampled by Fisheries Research Services

Station number Latitude Longitude Distance Between Stations (nm) approx
1 56° 57.80' N 02° 10.93' W -
2 56° 57.80' N 02° 10.00' W 0.5
3 56° 57.80' N 02° 09.07' W 0.5
4 56° 57.80' N 02° 08.14' W 0.5
5 56° 57.80' N 02° 07.21' W 0.5
6 56° 57.80' N 02° 06.20' W 0.5
7 56° 57.80' N 02° 05.28' W 0.5
8 56° 57.80' N 02° 04.35' W 0.5
9 56° 57.80' N 02° 02.50' W 1
10 56° 57.80' N 02° 00.65' W 1
11 56° 57.80' N 01° 58.80' W 1
12 56° 57.80' N 01° 56.95' W 1
13 56° 57.80' N 01° 55.10' W 1
14 56° 57.80' N 01° 53.25' W 1
15 56° 57.80' N 01° 52.32' W 0.5
16 56° 57.80' N 01° 51.39' W 0.5
17 56° 57.80' N 01° 50.47' W 0.5
18 56° 57.80' N 01° 49.55' W 0.5
19 56° 57.80' N 01° 48.63' W 0.5
20 56° 57.80' N 01° 46.78' W 1
21 56° 57.80' N 01° 43.08' W 2

As part of the on-going studies by Fisheries Research Services (FRS) weekly samples are collected from station number 6. This site has been sampled since January 1997.
The present and long-term objective is to monitor and assess the state of the ecosystem in the eastern, coastal waters of Scotland from the Stonehaven site.

Samples taken routinely include:
- Salinity and Temperature at near surface and near seabed
- Nutrient Chemical Concentrations, such as inorganic nitrate, phosphate and silicate
- Phytoplankton pigment concentration (chlorophyll a), species identifications and counts
- Zooplankton species identifications and counts.

Related Fixed Station activities are detailed in Appendix 1


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
Q value below limit of quantification

Appendix 1: Stonehaven line

Related series for this Fixed Station are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.

Series IdentifierData CategoryStart date/timeStart positionCruise
612136CTD or STD cast2002-03-31 11:10:0056.963 N, 2.0873 WFRV Clupea 0502C
612148CTD or STD cast2002-03-31 11:52:0056.9628 N, 2.0418 WFRV Clupea 0502C
612161CTD or STD cast2002-03-31 12:33:0056.962 N, 1.9812 WFRV Clupea 0502C
612173CTD or STD cast2002-03-31 13:20:0056.9627 N, 1.9185 WFRV Clupea 0502C
612185CTD or STD cast2002-03-31 13:56:0056.962 N, 1.8567 WFRV Clupea 0502C
612197CTD or STD cast2002-03-31 14:36:0056.9612 N, 1.8105 WFRV Clupea 0502C
612204CTD or STD cast2002-03-31 15:23:0056.9625 N, 1.7183 WFRV Clupea 0502C
617626CTD or STD cast2002-04-17 12:38:0056.964 N, 1.7182 WFRV Scotia 0602S
617638CTD or STD cast2002-04-17 13:58:0056.9642 N, 1.8068 WFRV Scotia 0602S
617663CTD or STD cast2002-04-17 16:12:0056.9627 N, 1.9193 WFRV Scotia 0602S
617675CTD or STD cast2002-04-17 17:02:0056.9627 N, 1.9757 WFRV Scotia 0602S
617687CTD or STD cast2002-04-17 17:46:0056.9652 N, 2.034 WFRV Scotia 0602S
617699CTD or STD cast2002-04-17 18:28:0056.9635 N, 2.0812 WFRV Scotia 0602S
614026CTD or STD cast2002-06-23 02:42:0056.9645 N, 2.089 WFRV Clupea 0902C
614038CTD or STD cast2002-06-23 03:20:0056.9642 N, 2.0415 WFRV Clupea 0902C
614051CTD or STD cast2002-06-23 03:52:0056.9637 N, 1.981 WFRV Clupea 0902C
614063CTD or STD cast2002-06-23 04:23:0056.9645 N, 1.9187 WFRV Clupea 0902C
614075CTD or STD cast2002-06-23 04:55:0056.9675 N, 1.8487 WFRV Clupea 0902C
614087CTD or STD cast2002-06-23 05:30:0056.9642 N, 1.8102 WFRV Clupea 0902C
614099CTD or STD cast2002-06-23 06:06:0056.9638 N, 1.7177 WFRV Clupea 0902C
615748CTD or STD cast2002-10-03 20:05:0056.9627 N, 2.09 WFRV Clupea 1502C_2
615761CTD or STD cast2002-10-03 20:33:0056.962 N, 2.0407 WFRV Clupea 1502C_2
615773CTD or STD cast2002-10-03 21:02:0056.9628 N, 1.9792 WFRV Clupea 1502C_2
615785CTD or STD cast2002-10-03 21:35:0056.9623 N, 1.9183 WFRV Clupea 1502C_2
615797CTD or STD cast2002-10-03 22:15:0056.963 N, 1.855 WFRV Clupea 1502C_2
615816CTD or STD cast2002-10-03 23:27:0056.9632 N, 1.719 WFRV Clupea 1502C_2
632985CTD or STD cast2003-03-21 15:20:0056.9547 N, 1.7292 WFRV Clupea 0503C
632997CTD or STD cast2003-03-21 16:10:0056.9618 N, 1.8105 WFRV Clupea 0503C
633000CTD or STD cast2003-03-21 17:06:0056.9638 N, 1.8592 WFRV Clupea 0503C
633012CTD or STD cast2003-03-21 17:40:0056.9637 N, 1.9167 WFRV Clupea 0503C
633024CTD or STD cast2003-03-21 18:18:0056.964 N, 1.9772 WFRV Clupea 0503C
633036CTD or STD cast2003-03-21 18:55:0056.9638 N, 2.036 WFRV Clupea 0503C
633048CTD or STD cast2003-03-21 19:25:0056.964 N, 2.086 WFRV Clupea 0503C
633546CTD or STD cast2003-06-05 14:45:0056.9592 N, 1.7342 WFRV Clupea 1003C_1
633558CTD or STD cast2003-06-05 15:35:0056.9635 N, 1.7647 WFRV Clupea 1003C_1
633571CTD or STD cast2003-06-05 16:08:0056.9612 N, 1.8558 WFRV Clupea 1003C_1
633583CTD or STD cast2003-06-05 16:38:0056.962 N, 1.9135 WFRV Clupea 1003C_1
633595CTD or STD cast2003-06-05 17:10:0056.9613 N, 1.9787 WFRV Clupea 1003C_1
633602CTD or STD cast2003-06-05 17:35:0056.962 N, 2.0397 WFRV Clupea 1003C_1
633614CTD or STD cast2003-06-05 18:00:0056.963 N, 2.0845 WFRV Clupea 1003C_1
634838CTD or STD cast2003-10-05 01:05:0056.9645 N, 2.0837 WFRV Clupea 1603C