Metadata Report for BODC Series Reference Number 1763995


Metadata Summary

Data Description

Data Category Surface temp/sal
Instrument Type
NameCategories
Sea-Bird SBE 45 MicroTSG thermosalinograph  thermosalinographs; water temperature sensor; salinity sensor
Turner 10-AU chlorophyll field fluorometer  fluorometers
Litre Meter LMSPFA.05 flow meter  flow meters
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Matt Palmer
Originating Organization National Oceanography Centre, Liverpool
Processing Status banked
Project(s) UKOARP_ThemeB
 

Data Identifiers

Originator's Identifier JR20120601_PRODQXF_SURF
BODC Series Reference 1763995
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2012-06-01 14:48
End Time (yyyy-mm-dd hh:mm) 2012-07-02 16:45
Nominal Cycle Interval 60.0 seconds
 

Spatial Co-ordinates

Southernmost Latitude 53.54183 N ( 53° 32.5' N )
Northernmost Latitude 79.06017 N ( 79° 3.6' N )
Westernmost Longitude 26.01767 W ( 26° 1.1' W )
Easternmost Longitude 26.07067 E ( 26° 4.2' E )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth 6.5 m
Maximum Sensor Depth 6.5 m
Minimum Sensor Height -
Maximum Sensor Height -
Sea Floor Depth -
Sensor Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor Depth Datum Approximate - Depth is only approximate
Sea Floor Depth Datum -
 

Parameters

BODC CODE Rank Units Short Title Title
AADYAA01 1 Days Date(Loch_Day) Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01 1 Days Time(Day_Fract) Time (time between 00:00 UT and timestamp)
ALATGP01 1 Degrees Lat_GPS Latitude north (WGS84) by unspecified GPS system
ALONGP01 1 Degrees Lon_GPS Longitude east (WGS84) by unspecified GPS system
CNDCSG01 1 Siemens per metre TSG_Cond Electrical conductivity of the water body by thermosalinograph
CPHLUMTF 1 Milligrams per cubic metre chl-a_water_NTTFfluor_manufctrcal Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >unknown phase] by through-flow fluorometer plumbed into non-toxic supply and manufacturer's calibration applied
INFLTF01 1 Litres per minute TSG+Fl_Flow Flow rate through instrument
PSALSG01 1 Dimensionless P_sal_TSG_calib Practical salinity of the water body by thermosalinograph and computation using UNESCO 1983 algorithm and calibration against independent measurements
SVELSG01 1 Metres per second TSG_Sound_Vel Sound velocity in the water body by thermosalinograph and computation from temperature and salinity by unspecified algorithm
TEMPHG01 1 Degrees Celsius CalTSGHullTmp Temperature of the water body by thermosalinograph hull sensor and verification against independent measurements
TEMPSG01 1 Degrees Celsius CalTSGTmp Temperature of the water body by thermosalinograph and verification against independent measurements
 

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

UK Ocean Acidification (UKOA) RRS James Clark Ross Cruise JR20120601/JR271 Underway Surface Hydrography Data Quality Report

The cruise report, cruise narrative and flow rate channel were used as a guide to the times when the underway flow was switched off, dropped low or was adjusted during the cruise. Where this occurred, channels PSALSU01, TEMPSU01, TEMPHU01, SVELSG01 and CNDCSG01 were flagged as suspect. Noise in the channels was also flagged.


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 .

Litre Meter LMSPFA.05 flowmeter

The LMSPFA.05 is a Pelton Wheel flowmeter designed to monitor water flow rates for pumped systems such as ships' continuous seawater supplies. The instrument can measure low flow rates in the range 0.006 to 0.1 l min -1 . The flow through the inlet of the meter is directed onto a rotor, whose rotation rate is directly proportional to the flow rate. A small sensing coil detects ferrites mounted in the flow meter rotor blade tips as they pass. Sapphire bearings are used to reduce friction, while maintaining mechanical robustness.

The LMSPFA series comprises several models that operate in the same manner but have different flow rate ranges and pressure drops.

The specification sheet can be accessed here Litre Meter LMSPFA .

Specifications

Pressure rating 40 bar (120 bar optional)
Flow range from 0.004 to 0.06 up to 0.1 to 28 l min -1
Temperature rating -20 to 70°C
Viscosity range up to 10 cPs
Accuracy

± 2% of actual reading for the top 90% of range

± 0.5% FSD for the bottom 10% of range

Repeatibility ± 0.2% reading over top 90% of range

LMSPFA model specifications

Model type Flow rate range (l min -1 ) Pressure drop
003 0.004 to 0.06

0.18 bar @ 0.03 l min -1

0.7 bar @ 0.06 l min -1

005 0.006 to 0.1

0.18 bar @ 0.05 l min -1

0.7 bar @ 0.1 l min -1

01 0.01 to 0.25

0.33 bar @ 0.125 l min -1

1.3 bar @ 0.25 l min -1

05 0.02 to 1.3

0.18 bar @ 0.65 l min -1

0.74 bar @ 1.3 l min -1

24 0.03 to 4.3

0.3 bar @ 2 l min -1

1.2 bar @ 4.3 l min -1

45 0.04 to 6.3

0.23 bar @ 3 l min -1

1.3 bar @ 6.3 l min -1

48 0.06 to 8

0.3 bar @ 4 l min -1

1.2 bar @ 8 l min -1

90 0.08 to 15

0.25 bar @ 9 l min -1

0.7 bar @ 15 l min -1

220 0.1 to 28

0.24 bar @ 10 l min -1

1.8 bar @ 28 l min -1

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:

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 .

UK Ocean Acidification (UKOA) RRS James Clark Ross Cruise JR20120601/JR271 Underway Surface Hydrography Instrumentation

The surface hydrography instruments used to collect this dataset are displayed in the table below.

Manufacturer Model Parameter measured
Sea Bird Electronics SBE45 Thermosalinograph salinity, temperature, conductivity, sound velocity
Chelsea Technologies 10-AU Fluorometer Chlorophyll-a
Litre Meter LMSPFA Flow meter Flow rate

UK Ocean Acidification (UKOA) RRS James Clark Ross Cruise JR20120601/JR271 Underway Surface Hydrography Data Processing Document

Originator's Data Processing

The sea surface hydrography measurements were performed by a Sea Bird electronics thermosalinograph in the ship's flow through system and by a temperature sensor located near the flow through intake, at the hull. The depth of the flow through intake was 7 m. The data streams were logged every second to the SCS system and merged into a comma separated file format, and the header information was stored in .TPL files. The surface hydrography data were also logged to the Oceanlogger.ACO file.

The table below shows details of the original files that were delivered to BODC.

Filename Content Description Start Date Start Time End Date End Time
oceanlogger.ACO Temperature, conductivity, salinity, sound velocity, chlorophyll, flow rate and meteorological parameters 01/06/2012 14:40:32 05/07/2012 13:00:48

BODC Data Processing

Reformatting

The underway data were reformatted from the originator's ASCII format to BODC's in-house standard. All parameters were merged into a single file, with a common time channel. Data supplied at higher frequency than the BODC file were bin-averaged to the appropriate time-interval. The channel has an interval of 60 seconds.

The originator's variables were mapped to the appropriate BODC parameter codes as follows:

oceanlogger.ACO

Originator's Parameter Originator's Units Description BODC Parameter BODC Units Comments
salinity psu Practical salinity of the water body by thermosalinograph and computation using UNESCO 1983 algorithm and NO calibration against independent measurements PSALSU01 Dimensionless Channel not transferred, uncalibrated channel.
sstemp °C Temperature of the water body by thermosalinograph hull sensor and NO verification against independent measurements TEMPHU01 °C Channel not transferred, uncalibrated channel.
tstemp °C Temperature of the water body by thermosalinograph and NO verification against independent measurements TEMPSU01 °C Channel not transferred, uncalibrated channel.
conductivity S m -1 Electrical conductivity of the water body by thermosalinograph CNDCSG01 S m -1
sound_velocity m s -1 Sound velocity in the water body by thermosalinograph and computation from temperature and salinity by unspecified algorithm SVELSG01 m s -1
chlorophyll µg l -3 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate phase] by through-flow fluorometer plumbed into non-toxic supply and manufacturer's calibration applied CPHLUMTF mg chl_a m -3
flowrate l min -1 Flow rate through instrument INFLTF01 l min -1

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.

Sample Calibrations

Calibration against sample data were applied to the temperature and salinity channels.

Temperature

The thermosalinograph hull temperature and the thermosalinograph temperature were interpolated over the time recorded by the CTD. The stainless steel and titanium CTD temperature channels were used to obtain a linear regression to calibrate both of the underway temperature channels.

For the hull temperature, outliers were removed and an r 2 value of 0.993 was obtained. The temperature was then corrected using:

Channel Calibration Equation
Temperature TEMPHG01 = 0.9853 * TEMPHU01 + 0.2830.

For the thermosalinograph temperature, once any outliers had been removed, an r 2 value of 0.992 was obtained and the temperature was corrected using:

Channel Calibration Equation
Temperature TEMPSG01 = 1.0442 * TEMPSU01 - 1.1011

Salinity

Only the stainless steel CTD was used to calibrate the underway salinity channel since there were issues when correcting the salinity channel on the titanium CTD. Once outliers had been removed, an r 2 value of 0.999 was obtained and the underway system was corrected using:

Channel Calibration Equation
Salinity PSALSG01 = 0.9784 * PSALSU01 + 0.7812.

Project Information

UKOARP Theme B: Ocean acidification impacts on sea surface biology, biogeochemistry and climate

The overall aim of this theme is to obtain a quantitative understanding of the impact of ocean acidification (OA) on the surface ocean biology and ecosystem and on the role of the surface ocean within the overall Earth System.

The aims of the theme are:

The main consortium activities will consist of in-situ measurements on three dedicated cruises, as well as on-deck bioassay experiments probing the response of the in-situ community to elevated CO2. Most of the planned work will be carried out on the three cruises to locations with strong gradients in seawater carbon chemistry and pH; the Arctic Ocean, around the British Isles and the Southern Ocean.

Weblink: http://www.oceanacidification.org.uk/research_programme/surface_ocean.aspx


Data Activity or Cruise Information

Cruise

Cruise Name JR20120601 (JR271)
Departure Date 2012-06-01
Arrival Date 2012-07-02
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