Metadata Report for BODC Series Reference Number 1292109


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
Niskin bottle  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Dr Ken Jones
Originating Organization Dunstaffnage Marine Laboratory (now Scottish Association for Marine Science)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) LOIS Shelf Edge Study (LOIS - SES)
 

Data Identifiers

Originator's Identifier CH128A_CTD_NUTS_59:CP18
BODC Series Reference 1292109
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1996-07-14 05:14
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 56.57280 N ( 56° 34.4' N )
Longitude 9.05520 W ( 9° 3.3' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 4.5 m
Maximum Sensor or Sampling Depth 307.4 m
Minimum Sensor or Sampling Height 8.6 m
Maximum Sensor or Sampling Height 311.5 m
Sea Floor Depth 316.0 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Unspecified -
Sensor or Sampling Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODERankUnitsTitle
ADEPZZ011MetresDepth below surface of the water body
AMONAATX1Micromoles per litreConcentration of ammonium {NH4+ CAS 14798-03-9} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
BOTTFLAG1DimensionlessSampling process quality flag (BODC C22)
NTRZAATX1Micromoles per litreConcentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
PHOSAATX1Micromoles per litreConcentration of phosphate {PO43- CAS 14265-44-2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
SAMPRFNM1DimensionlessSample reference number
SLCAAATX1Micromoles per litreConcentration of silicate {SiO44- CAS 17181-37-2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis

Definition of BOTTFLAG

BOTTFLAGDefinition
0The sampling event occurred without any incident being reported to BODC.
1The filter in an in-situ sampling pump physically ruptured during sample resulting in an unquantifiable loss of sampled material.
2Analytical evidence (e.g. surface water salinity measured on a sample collected at depth) indicates that the water sample has been contaminated by water from depths other than the depths of sampling.
3The feedback indicator on the deck unit reported that the bottle closure command had failed. General Oceanics deck units used on NERC vessels in the 80s and 90s were renowned for reporting misfires when the bottle had been closed. This flag is also suitable for when a trigger command is mistakenly sent to a bottle that has previously been fired.
4During the sampling deployment the bottle was fired in an order other than incrementing rosette position. Indicative of the potential for errors in the assignment of bottle firing depth, especially with General Oceanics rosettes.
5Water was reported to be escaping from the bottle as the rosette was being recovered.
6The bottle seals were observed to be incorrectly seated and the bottle was only part full of water on recovery.
7Either the bottle was found to contain no sample on recovery or there was no bottle fitted to the rosette position fired (but SBE35 record may exist).
8There is reason to doubt the accuracy of the sampling depth associated with the sample.
9The bottle air vent had not been closed prior to deployment giving rise to a risk of sample contamination through leakage.

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

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

Niskin Bottle

The Niskin bottle is a device used by oceanographers to collect subsurface seawater samples. It is a plastic bottle with caps and rubber seals at each end and is deployed with the caps held open, allowing free-flushing of the bottle as it moves through the water column.

Standard Niskin

The standard version of the bottle includes a plastic-coated metal spring or elastic cord running through the interior of the bottle that joins the two caps, and the caps are held open against the spring by plastic lanyards. When the bottle reaches the desired depth the lanyards are released by a pressure-actuated switch, command signal or messenger weight and the caps are forced shut and sealed, trapping the seawater sample.

Lever Action Niskin

The Lever Action Niskin Bottle differs from the standard version, in that the caps are held open during deployment by externally mounted stainless steel springs rather than an internal spring or cord. Lever Action Niskins are recommended for applications where a completely clear sample chamber is critical or for use in deep cold water.

Clean Sampling

A modified version of the standard Niskin bottle has been developed for clean sampling. This is teflon-coated and uses a latex cord to close the caps rather than a metal spring. The clean version of the Levered Action Niskin bottle is also teflon-coated and uses epoxy covered springs in place of the stainless steel springs. These bottles are specifically designed to minimise metal contamination when sampling trace metals.

Deployment

Bottles may be deployed singly clamped to a wire or in groups of up to 48 on a rosette. Standard bottles have a capacity between 1.7 and 30 L, while Lever Action bottles have a capacity between 1.7 and 12 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.

Nutrients for Charles Darwin and RRS Challenger cruises

Document History

Converted from CDROM documentation.

Content of data series

AMONAATX Ammonium (unfiltered)
Colorometric autoanalysis (unfiltered)
Micromoles/litre
NTRZAAD1 Dissolved nitrate + nitrite
Colorometric autoanalysis (GF/F filtered)
Micromoles/litre
NTRZAATX Nitrate + nitrite (unfiltered)
Colorometric autoanalysis (unfiltered)
Micromoles/litre
PHOSAAD1 Dissolved phosphate
Colorometric autoanalysis (GF/F filtered)
Micromoles/litre
PHOSAATX Phosphate (unfiltered)
Colorometric autoanalysis (unfiltered)
Micromoles/litre
SLCAAATX Silicate (unfiltered)
Colorometric autoanalysis (unfiltered)
Micromoles/litre

Data Originator

Dr Ken Jones, CCMS Dunstaffnage Marine Laboratory, UK.

Sampling strategy and methodology

Charles Darwin cruises CD92B, CD93A and CD93B and RRS Challenger cruises CH120, CH121B, CH123B, CH124, CH125B, CH126B and CH128A.

Samples were collected using either Niskin bottles deployed on a CTD rosette (CD93A, CD93B, CH121B, CH123B, CH125B, CH126B and CH128A) or NIO bottles deployed on a hydrographic wire in conjunction with a CTD cast (CD92B, CH120 and CH124).

The samples were transferred to a refrigerator at 4°C immediately after collection and were analysed within a few hours on a Lachat autoanalyser using standard colorometric chemistry.

Comments on data quality

An intercalibration of the two nutrient data sets was carried out. Simple regression, excluding data values deemed suspect, yielded the following equations:

POL NO3+NO2 = 0.93 DML NO3+NO2 - 0.14 (R2 = 0.80)
POL PO4 = 0.84 DML PO4 + 0.07 (R2 = 0.78)

The POL nutrient values are systematically significantly lower than the DML data. When individual data values are inspected it can be seen that in some samples the POL values are down to a half of the DML values. This nutrient loss may be attributed to biological activity during sample storage.

The POL data were primarily collected to allow estimation of dissolved organic nitrogen and phosphorus from contemporary total nitrogen and phosphorus determinations. It is therefore recommended that the DML data be used for all considerations of ambient nutrient concentrations and that the POL data be considered as metadata for the TDN and TDP data.


Project Information

LOIS Shelf Edge Study (LOIS - SES)

Introduction

SES was a component of the NERC Land Ocean Interaction Study (LOIS) Community Research Programme that made intensive measurements from the shelf break in the region known as the Hebridean Slope from March 1995 to September 1996.

Scientific Rationale

SES was devoted to the study of interactions between the shelf seas and the open ocean. The specific objectives of the project were:

Fieldwork

The SES fieldwork was focussed on a box enclosing two sections across the shelf break at 56.4-56.5 °N and 56.6-56.7 °N. Moored instrument arrays were maintained throughout the experiment at stations with water depths ranging from 140 m to 1500 m, although there were heavy losses due to the intensive fishing activity in the area. The moorings included meteorological buoys, current meters, transmissometers, fluorometers, nutrient analysers (but these never returned any usable data), thermistor chains, colour sensors and sediment traps.

The moorings were serviced by research cruises at approximately three-monthly intervals. In addition to the mooring work this cruises undertook intensive CTD, water bottle and benthic surveys with cruise durations of up to 6 weeks (3 legs of approximately 2 weeks each).

Moored instrument activities associated with SES comprised current measurements in the North Channel in 1993 and the Tiree Passage from 1995-1996. These provided boundary conditions for SES modelling activities.

Additional data were provided through cruises undertaken by the Defence Evaluation and Research Agency (DERA) in a co-operative programme known as SESAME.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 1996-07-14
End Date (yyyy-mm-dd) 1996-07-14
Organization Undertaking ActivityUniversity of Wales, Bangor School of Ocean Sciences (now Bangor University School of Ocean Sciences)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierCH128A_CTD_CP18
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for CH128A_CTD_CP18

Sample reference number Nominal collection volume(l) Bottle rosette position Bottle firing sequence number Minimum pressure sampled (dbar) Maximum pressure sampled (dbar) Depth of sampling point (m) Bottle type Sample quality flag Bottle reference Comments
83904   10.00       60.00   62.50   59.40 Niskin bottle No problem reported    
84037   10.00      310.50  313.10  307.40 Niskin bottle No problem reported    
84038   10.00      201.10  203.50  199.10 Niskin bottle No problem reported    
84039   10.00       15.70   17.50   15.10 Niskin bottle No problem reported    
84040   10.00        5.10    6.70    4.50 Niskin bottle No problem reported    
84150   10.00       99.40  102.60   98.80 Niskin bottle No problem reported    
84151   10.00       31.00   32.80   30.30 Niskin bottle No problem reported    

Please note:the supplied parameters may not have been sampled from all the bottle firings described in the table above. Cross-match the Sample Reference Number above against the SAMPRFNM value in the data file to identify the relevant metadata.

Related Data Activity activities are detailed in Appendix 1

Cruise

Cruise Name CH128A
Departure Date 1996-07-10
Arrival Date 1996-07-26
Principal Scientist(s)John H Simpson (University of Wales, Bangor School of Ocean Sciences)
Ship RRS Challenger

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameLOIS (SES) Repeat Section P
CategoryOffshore route/traverse

LOIS (SES) Repeat Section P

Section P was one of four repeat sections sampled during the Land-Ocean Interaction Study (LOIS) Shelf Edge Study (SES) project between March 1995 and September 1996.

The CTD measurements collected at repeat section P, on the Hebridean Slope, lie within a box bounded by co-ordinates 56° 33.0' N, 9° 37.8' W at the southwest corner and 56° 39.0' N, 8° 55.8' W at the northeast corner.

Cruises occupying section P

Cruise Start Date End Date
Charles Darwin 93B 16/05/1995 30/05/1995
Tydeman SESAME-1 10/08/1995 11/09/1995
Challenger 121C 01/09/1995 10/09/1995
Challenger 123B 01/12/1995 15/12/1995
Challenger 125A 31/01/1996 12/02/1996
Challenger 126A 11/04/1996 26/04/1996
Challenger 126B 27/04/1996 12/05/1996
Challenger 128A 10/07/1996 26/07/1996
Challenger 128B 26/07/1996 08/08/1996

Related Fixed Station activities are detailed in Appendix 2


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: CH128A_CTD_CP18

Related series for this Data Activity 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
1666642Water sample data1996-07-14 05:14:0056.5728 N, 9.0552 WRRS Challenger CH128A

Appendix 2: LOIS (SES) Repeat Section P

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
849053CTD or STD cast1995-05-19 14:48:0056.6495 N, 9.61367 WRRS Charles Darwin CD93B
849065CTD or STD cast1995-05-19 17:55:0056.63067 N, 9.4645 WRRS Charles Darwin CD93B
849471CTD or STD cast1995-05-19 20:15:0056.6045 N, 9.28517 WRRS Charles Darwin CD93B
849077CTD or STD cast1995-05-19 22:20:0056.59867 N, 9.22533 WRRS Charles Darwin CD93B
848603CTD or STD cast1995-05-20 01:19:0056.58883 N, 9.18267 WRRS Charles Darwin CD93B
848283CTD or STD cast1995-05-20 02:52:0056.57783 N, 9.1135 WRRS Charles Darwin CD93B
849201CTD or STD cast1995-05-20 04:14:0056.56817 N, 9.0525 WRRS Charles Darwin CD93B
848295CTD or STD cast1995-05-20 05:23:0056.56583 N, 9.03183 WRRS Charles Darwin CD93B
848615CTD or STD cast1995-05-20 06:25:0056.56267 N, 9.00317 WRRS Charles Darwin CD93B
848627CTD or STD cast1995-05-20 07:31:0056.5505 N, 8.93517 WRRS Charles Darwin CD93B
852165CTD or STD cast1995-09-06 05:10:0056.60467 N, 9.28667 WRRS Challenger CH121C
852073CTD or STD cast1995-09-07 04:04:0056.56067 N, 9.00233 WRRS Challenger CH121C
852085CTD or STD cast1995-09-07 04:37:0056.569 N, 9.05383 WRRS Challenger CH121C
852189CTD or STD cast1995-09-07 05:15:0056.56433 N, 9.032 WRRS Challenger CH121C
852097CTD or STD cast1995-09-07 13:04:0056.57667 N, 9.111 WRRS Challenger CH121C
855427CTD or STD cast1995-12-09 22:33:0056.54767 N, 8.93567 WRRS Challenger CH123B
855083CTD or STD cast1995-12-10 00:54:0056.5665 N, 9.037 WRRS Challenger CH123B
855439CTD or STD cast1995-12-10 06:06:0056.57967 N, 9.05983 WRRS Challenger CH123B
855440CTD or STD cast1995-12-10 07:20:0056.57917 N, 9.10833 WRRS Challenger CH123B
855095CTD or STD cast1995-12-10 08:45:0056.5885 N, 9.17983 WRRS Challenger CH123B
855452CTD or STD cast1995-12-10 10:23:0056.591 N, 9.23767 WRRS Challenger CH123B
855913CTD or STD cast1995-12-10 12:11:0056.6 N, 9.28967 WRRS Challenger CH123B
855102CTD or STD cast1995-12-10 13:58:0056.61133 N, 9.36767 WRRS Challenger CH123B
855464CTD or STD cast1995-12-10 15:57:0056.63017 N, 9.45283 WRRS Challenger CH123B
855476CTD or STD cast1995-12-10 18:43:0056.651 N, 9.59233 WRRS Challenger CH123B
856166CTD or STD cast1996-02-10 21:21:0056.54933 N, 8.93217 WRRS Challenger CH125A
856178CTD or STD cast1996-02-10 22:09:0056.55817 N, 8.998 WRRS Challenger CH125A
856191CTD or STD cast1996-02-10 22:49:0056.564 N, 9.03183 WRRS Challenger CH125A
856209CTD or STD cast1996-02-10 23:52:0056.5755 N, 9.119 WRRS Challenger CH125A
856210CTD or STD cast1996-02-11 00:55:0056.58433 N, 9.18333 WRRS Challenger CH125A
856222CTD or STD cast1996-02-11 02:14:0056.602 N, 9.30033 WRRS Challenger CH125A
856234CTD or STD cast1996-02-11 04:15:0056.6265 N, 9.47483 WRRS Challenger CH125A
858277CTD or STD cast1996-04-21 12:51:0056.65217 N, 9.62633 WRRS Challenger CH126A
1675633Water sample data1996-04-21 13:49:0056.65217 N, 9.62634 WRRS Challenger CH126A
859822CTD or STD cast1996-05-04 00:47:0056.55 N, 8.93483 WRRS Challenger CH126B
859834CTD or STD cast1996-05-04 01:41:0056.56117 N, 9.00417 WRRS Challenger CH126B
858498CTD or STD cast1996-05-04 02:24:0056.56517 N, 9.033 WRRS Challenger CH126B
859846CTD or STD cast1996-05-04 03:12:0056.5685 N, 9.05333 WRRS Challenger CH126B
859858CTD or STD cast1996-05-04 04:12:0056.57917 N, 9.114 WRRS Challenger CH126B
859871CTD or STD cast1996-05-04 05:22:0056.5905 N, 9.1815 WRRS Challenger CH126B
859883CTD or STD cast1996-05-04 06:39:0056.598 N, 9.23083 WRRS Challenger CH126B
859895CTD or STD cast1996-05-04 08:06:0056.60817 N, 9.289 WRRS Challenger CH126B
859902CTD or STD cast1996-05-04 10:06:0056.62517 N, 9.45767 WRRS Challenger CH126B
859914CTD or STD cast1996-05-04 12:05:0056.6435 N, 9.6275 WRRS Challenger CH126B
860190CTD or STD cast1996-07-12 22:41:0056.591 N, 9.28367 WRRS Challenger CH128A
1292054Water sample data1996-07-12 23:13:0056.59105 N, 9.28359 WRRS Challenger CH128A
860638CTD or STD cast1996-07-13 22:47:0056.58217 N, 9.19033 WRRS Challenger CH128A
1292078Water sample data1996-07-13 23:14:0056.58217 N, 9.19037 WRRS Challenger CH128A
860651CTD or STD cast1996-07-14 00:43:0056.579 N, 9.1235 WRRS Challenger CH128A
1292091Water sample data1996-07-14 01:07:0056.57894 N, 9.12346 WRRS Challenger CH128A
860417CTD or STD cast1996-07-14 05:00:0056.57283 N, 9.05517 WRRS Challenger CH128A
860663CTD or STD cast1996-07-14 06:11:0056.5665 N, 9.03067 WRRS Challenger CH128A
1292110Water sample data1996-07-14 06:20:0056.56648 N, 9.03061 WRRS Challenger CH128A
860675CTD or STD cast1996-07-14 07:20:0056.5515 N, 8.93617 WRRS Challenger CH128A
1292134Water sample data1996-07-14 07:26:0056.55145 N, 8.93623 WRRS Challenger CH128A
861421CTD or STD cast1996-08-02 13:22:0056.62317 N, 9.596 WRRS Challenger CH128B
861119CTD or STD cast1996-08-03 21:01:0056.6005 N, 9.28817 WRRS Challenger CH128B