Metadata Report for BODC Series Reference Number 1362717


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
Non-toxic sea water supply  continuous water samplers
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Claire Mahaffey
Originating Organization University of Liverpool Department of Earth and Ocean Sciences (now University of Liverpool Department of Earth, Ocean and Ecological Sciences)
Processing Status banked
Project(s) Oceans 2025 Theme 10 SO11
 

Data Identifiers

Originator's Identifier PD17_10_GPUMP_NUTS_742:
BODC Series Reference 1362717
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-06-09 20:30
End Time (yyyy-mm-dd hh:mm) 2010-06-09 20:30
Nominal Cycle Interval -
 

Spatial Co-ordinates

Southernmost Latitude 53.78280 N ( 53° 47.0' N )
Northernmost Latitude 53.78280 N ( 53° 47.0' N )
Westernmost Longitude 3.92710 W ( 3° 55.6' W )
Easternmost Longitude 3.92710 W ( 3° 55.6' W )
Positional Uncertainty Unspecified
Minimum Sensor Depth 3.0 m
Maximum Sensor Depth 3.0 m
Minimum Sensor Height -
Maximum Sensor Height -
Sea Floor Depth -
Sensor Distribution Unspecified -
Sensor Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -
 

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
NTRZAATX 1 Micromoles per litre NO3+NO2_Unfilt_ColAA Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
PHOSAATX 1 Micromoles per litre PO4_Unfilt_ColAA Concentration of phosphate {PO43- CAS 14265-44-2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
SDNZAATX 1 Micromoles per litre NO3+NO2SD Concentration standard deviation of nitrate+nitrite {NO3+NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
SDPHAATX 1 Micromoles per litre SD_PO4 Concentration standard deviation of phosphate {PO43- CAS 14265-44-2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
SLCAAATX 1 Micromoles per litre SiOx_Unfilt_ColAA Concentration of silicate {SiO44- CAS 17181-37-2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
SLSDAATX 1 Micromoles per litre SD_SiO4 Concentration standard deviation of silicate {SiO44- CAS 17181-37-2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
 

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

Non-toxic (underway) sea water supply

A source of uncontaminated near-surface (commonly 3 to 7 m) seawater pumped continuously to shipboard laboratories on research vessels. There is typically a temperature sensor near the intake (known as the hull temperature) to provide measurements that are as close as possible to the ambient water temperature. The flow from the supply is typically directed through continuously logged sensors such as a thermosalinograph and a fluorometer. Water samples are often collected from the non-toxic supply. The system is also referred to as the underway supply.

PD17_10 dissolved nutrient data series measured by DEOS

Originator's Data Processing

Sampling Strategy

Samples for nutrient analyses were collected by the Department of Earth and Ocean Sciences, Liverpool University (DEOS) on a National Oceanography Centre, Liverpool (NOC) Oceans 2025 SO11 Coastal Observatory cruise (number 69) in Liverpool Bay and the Eastern Irish Sea. The cruise ran from 09 - 10 June 2010.

Single samples were collected near-surface and near-bed from water bottle rosette sampling systems mounted on the lowered CTD during 29 CTD casts carried out at stations throughout Liverpool Bay and the Eastern Irish Sea. Additionally, a single sample was taken from the ship flow-through underway monitoring system at 20:30 UTC 09 June 2010.

The nutrient samples were collected directly into acid-washed, deionised water rinsed 125 ml high density polyethylene (HDPE) screw cap bottles. The HDPE bottles were rinsed 3 times with sample water and then filled with approximately 100 ml of sample. The bottles were then capped and labelled.

Data Processing

The samples were placed in a -20 °C freezer and frozen upright. The samples were transported frozen to Liverpool University for analysis. Prior to analysis, samples were defrosted in the dark and all analyses were performed within 1 week of sample collection. Analysis was carried out by splitting each single sample into triplicate sub-samples and analysing these using a Quaatro AQ2 Autoanalyzer 3 (Seal Analytical, 2006). Due to a technical problem with the Autoanalyzer, the Data Originator was unable to supply BODC with nitrite data for this cruise.

References

Seal Analytical, 2006. AutoAnalyzer 3 Quaatro AQ2 AACE, Seal Analytical GmbH, Werkstrasse 4, D-22844, Norderstadt, Germany

Processing Undertaken by BODC

The data were supplied to BODC as an Excel spreadsheet. This was converted to an ASCII format file for loading into the BODC archive. The variables supplied by the Data Originator were mapped to BODC parameter vocabularies as follows:

Originator's Parameter Units Description BODC Parameter Code Units
N + N µmol l -1 Concentration of nitrate+nitrite {NO 3 +NO 2 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis NTRZAATX µmol l -1
standard deviation µmol l -1 Concentration standard deviation of nitrate+nitrite {NO 3 +NO 2 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis SDNZAATX µmol l -1
Silicate µmol l -1 Concentration of silicate {SiO 4 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis SLCAAATX µmol l -1
stdev µmol l -1 Concentration standard deviation of silicate {SiO 4 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis SLSDAATX µmol l -1
phosphate µmol l -1 Concentration of phosphate {PO 4 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis PHOSAATX µmol l -1
stdev µmol l -1 Concentration standard deviation of phosphate {PO 4 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis SDPHAATX µmol l -1

The data were loaded into the database by matching the sample's station identifier and depth with the information already held in the database for this cruise. Records for this cruise indicated that all near-surface samples were taken from rosette bottles 9. The near-bed samples were taken from rosette bottle 4.

Data Quality Report

Nitrate + Nitrite

Flags were applied to the near-surface and near-bed data for cast002, cast007, cast022 and cast024. Flags were also applied to the near-surface data collected from cast003, cast004, cast011, cast012, cast026 and cast028, and to the near-bed data collected from cast023. The applied flag indicates the real value is below the limit of detection of the auto-analyzer. The detection limit is the quoted value (0.1 µmol l -1 ).

Silicate

Flags were applied to the near-surface and near-bed data taken during cast003 - cast008, cast011 - cast013, cast016, cast017 and cast020. Flags were also applied to the near-surface samples taken during cast010, cast014 and cast028, and to the near-bed samples taken during cast002, cast015, cast021 and cast025. The applied flag indicates the real value is below the limit of detection of the auto-analyzer. The detection limit is the quoted value (0.5 µmol l -1 ).


Project Information

Oceans 2025 Theme 10, Sustained Observation Activity 11: Liverpool Bay and Irish Sea Coastal Observatory

Sustained, systematic observations of the ocean and continental shelf seas at appropriate time and space scales allied to numerical models are key to understanding and prediction. In shelf seas these observations address issues as fundamental as 'what is the capacity of shelf seas to absorb change?' encompassing the impacts of climate change, biological productivity and diversity, sustainable management, pollution and public health, safety at sea and extreme events. Advancing understanding of coastal processes to use and manage these resources better is challenging; important controlling processes occur over a broad range of spatial and temporal scales which cannot be simultaneously studied solely with satellite or ship-based platforms.

Considerable effort has been spent by the Proudman Oceangraphic Laboratory (POL) in the years 2001 - 2006 in setting up an integrated observational and now-cast modelling system in Liverpool Bay (see Figure), with the recent POL review stating the observatory was seen as a leader in its field and a unique 'selling' point of the laboratory. Cost benefit analysis (IACMST, 2004) shows that benefits really start to accrue after 10 years. In 2007 - 2012 exploitation of (i) the time series being acquired, (ii) the model-data synthesis and (iii) the increasingly available quantities of real-time data (e.g. river flows) can be carried out through Sustained Observation Activity (SO) 11, to provide an integrated assessment and short term forecasts of the coastal ocean state.

BODC image

Overall Aims and Purpose of SO 11

Measurement and Modelling Activities

More detailed information on this Work Package is available at pages 32 - 35 of the official Oceans 2025 Theme 10 document: Oceans 2025 Theme 10

Weblink: http://www.oceans2025.org/

References:

IACMST., 2004. The Economics of Sustained Marine Measurements. IACMST Information Document, N0.11, Southampton: IACMST, 96 pp


Data Activity or Cruise Information

Cruise

Cruise Name PD17/10
Departure Date 2010-06-09
Arrival Date 2010-06-10
Principal Scientist(s)M John Howarth (National Oceanography Centre, Liverpool)
Ship RV Prince Madog

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