Metadata Report for BODC Series Reference Number 1285254


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 Peter Statham
Originating Organization University of Southampton Department of Oceanography (now University of Southampton School of Ocean and Earth Science)
Processing Status banked
Project(s) LOIS River-Atmosphere-Coast Study (RACS)
 

Data Identifiers

Originator's Identifier CH108A_CTD_NUTS_8:CTD43
BODC Series Reference 1285254
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1993-11-19 09:06
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 54.75138 N ( 54° 45.1' N )
Longitude 0.20666 W ( 0° 12.4' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 3.5 m
Maximum Sensor Depth 3.5 m
Minimum Sensor Height 64.2 m
Maximum Sensor Height 64.2 m
Sea Floor Depth 67.7 m
Sensor Distribution Unspecified -
Sensor Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODE Rank Units Short Title Title
ADEPZZ01 1 Metres DepBelowSurf Depth below surface of the water body
BOTTFLAG 1 Dimensionless C22_flag Sampling process quality flag (BODC C22)
PHOSMAD1 1 Micromoles per litre PO4_GF/FFilt_ColMan Concentration of phosphate {PO43- CAS 14265-44-2} per unit volume of the water body [dissolved plus reactive particulate
SAMPRFNM 1 Dimensionless SampRef Sample reference number
SDPHMAD1 1 Micromoles per litre SDPO4 Concentration standard deviation of phosphate {PO43- CAS 14265-44-2} per unit volume of the water body [dissolved plus reactive particulate
 

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 cruises RRS Challenger CH108A, CH108C and CH115A.

Document History

Converted from CDROM documentation.

Content of data series

AMONAAD2 Dissolved ammonium
Colorimetric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
AMONFID2 Dissolved ammonium
Flow-injection ammonium analyser (0.4/0.45 µm pore filtered)
Micromoles/litre
AMONMPD1 Dissolved ammonium
Manual analysis using the phenol and sodium nitrocyanoferrate method (GF/F filtered)
Micromoles/litre
NTRIAAD2 Dissolved nitrite
Colorimetric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
NTRIAATX Nitrite (unfiltered)
Colorimetric autoanalysis (unfiltered)
Micromoles/litre
NTRZAAD1 Dissolved nitrate + nitrite
Colorimetric autoanalysis (GF/F filtered)
Micromoles/litre
NTRZAAD2 Dissolved nitrate + nitrite
Colorimetric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
NTRZAATX Nitrate + nitrite (unfiltered)
Colorimetric autoanalysis (unfiltered)
Micromoles/litre
PHOSAAD2 Dissolved phosphate
Colorimetric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
PHOSAATX Phosphate (unfiltered)
Colorimetric autoanalysis (unfiltered)
Micromoles/litre
PHOSMAD1 Dissolved phosphate
Manual colorimetric analysis (GF/F filtered)
Micromoles/litre
SDAMMPD1 Dissolved ammonium standard deviation
Manual analysis using the phenol and sodium nitrocyanoferrate method (GF/F filtered)
Micromoles/litre
SDPHMAD1 Dissolved phosphate standard deviation
Manual colorimetric analysis (GF/F filtered)
Micromoles/litre
SDURMDD1 Dissolved urea
Manual analysis using the diacetylmonoxime method (GF/F filtered)
Micromoles/litre
SLCAAAD1 Dissolved silicate
Colorimetric autoanalysis (GF/F filtered)
Micromoles/litre
SLCAAAD2 Dissolved silicate
Colorimetric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
TPHSWCD1 Dissolved total phosphorus
Oxidation then colorimetric analysis (GF/F filtered)
Micromoles/litre
UREAMDD1 Dissolved urea
Manual analysis using the diacetylmonoxime method (GF/F filtered)
Micromoles/litre

Data Originator

Dr Peter Statham SOES, Southampton Oceanography Centre

NB Users interested in nutrient data should be aware that there are continuous surface nutrient measurements for each RRS Challenger cruise included in the underway data set.

Sampling strategy and methodology

Water samples were collected from either the ship's non-toxic pumped seawater supply or from water bottles on the CTD rosette. The samples were filtered immediately through tared GF/F filters and both the filters and filtrate were stored frozen until analysed back at the laboratory.

The filtrates were analysed using manual colorimetric methods (Parsons et al., 1984) for orthophosphate. Total phosphate was determined by the same method on sample aliquots in which the organic phosphorous had been oxidised to phosphate. Further details are given in Ormaza-Gonzalez and Statham (1996).

References

Balls, P.B. and Laslett, R., 1991. A simple estuarine water sampler suitable for trace metals and other constituents. Estuarine Coastal and Shelf Science 33, 623-629.

Mantoura, R.F.C. and Woodward, E.M.S., 1983. Optimisation of the indophenol blue method for the automated determination of ammonia in estuarine waters. Estuarine, Coastal and Shelf Science, 17, 219-224.

Morris, A.W., Howland, R.J.M. and Bale, A.J. (1978). A filtration unit for use with continuous autoanalytical systems applied to highly turbid waters. Est. Coast. Mar. Sci. 6, 105-109.

Ormaza-Gonzalez, F.I. and Statham, P.J., 1996. A comparison of methods for the determination of dissolved and particulate phosphorus in natural waters. Water Research, 30(1), 2739-2747.

Parsons, T.R., Maita, Y. and Lalli, C.M., 1984. A Manual of Chemical and Biological Methods for Seawater Analysis. Pergamon Press.

Willason S.W. and Johnson, K.S, 1986. A rapid, highly sensitive technique for the determination of ammonia in sea water. Mar. Biol. 91, 285-290.


Project Information

LOIS River-Atmosphere-Coast Study (LOIS - RACS)

Introduction

The Land-Ocean Interaction Study (LOIS) was a NERC research programme designed to study processes in the coastal zone. The Rivers, Atmosphere and Coasts Study (RACS) was a major component of LOIS that looked at land-sea interactions in the coastal zone and the major exchanges (physical, chemical and biological) between rivers and estuaries and the atmosphere. The study focused on the east coast of the UK from the Wash to the Tweed.

RACS included several sub-components

RACS (A) was coordinated by the University of East Anglia and RACS (C) by the Plymouth Marine Laboratory.

RACS (A)

The bulk of the RACS (A) data set was collected during two field campaigns in the winter (October/November) of 1994 and the summer (May/June) of 1995. During these campaigns data were collected continuously from the University of East Anglia Atmospheric Observatory at Weybourne on the north Norfolk coast. An instrumented vessel was stationed offshore to provide a second sampling site to allow changes in a given air mass to be monitored. The Imperial College Jetstream research aircraft made one flight during each campaign to provide a link between the two surface stations. The Jetstream made four additional flights in 1996 and 1997.

RACS (C)

The coastal oceanographic survey

The coastal oceanographic data set was collected during a series of 17 RRS Challenger cruise legs. Most cruises covered two survey grids. One from Great Yarmouth to the Humber designed around the distribution of the sandbanks and a second simple zig-zag grid from the Humber to Berwick on Tweed. A large number of anchor stations, usually over one or two tidal cycles, were worked in the area of the Humber mouth or the Holderness coast.

The Humber estuarine study

The Humber estuarine data set was collected during a series of 33 campaigns on the Environment Agency vessels Sea Vigil and Water Guardian in the Humber, Trent and Ouse river systems at approximately monthly intervals between June 1993 and December 1996. Each campaign consisted of two or three one-day cruises. The tracks covered the estuary from the tidal limits of both Trent and Ouse to Spurn Point. Instrumental and sample data are available from a series of fixed stations that were sampled during every campaign.

The Tweed estuarine study

The Tweed estuarine data set was collected during a series of 13 campaigns using RV Tamaris in association with a rigid inflatable vessel at approximately monthly intervals between July 1996 and July 1997. Each campaign covered the tidal reaches of the River Tweed.

The Holderness experiment

The Holderness Experiment was designed to monitor the process of sediment transport along the Holderness coastline. It consisted of three moored instrument deployments during the winters of 1993-1994, 1994-1995 and 1995-1996. Mooring platforms were deployed at eight stations along two lines off the Holderness coast. A northerly and a southerly line of four stations each were used (N1 - N4 and S1 to S4) with the lowest numbers being inshore. Both lines were approximately perpendicular to the coast, although the S4 station lay to the south of the S line, off Spurn Head.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 1993-11-19
End Date (yyyy-mm-dd) 1993-11-19
Organization Undertaking ActivityPlymouth Marine Laboratory
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierCH108A_CTD_CTD43
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for CH108A_CTD_CTD43

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
364277   10.00       61.10   62.00   60.80 Niskin bottle No problem reported    
364278   10.00        3.60    4.00    3.50 Niskin bottle No problem reported    
364279   10.00        1.10    1.80    1.20 General Oceanics GO-FLO water sampler 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.

Other Series linked to this Data Activity - 1684187

Cruise

Cruise Name CH108A
Departure Date 1993-11-09
Arrival Date 1993-11-24
Principal Scientist(s)Robin M H Howland (Plymouth Marine Laboratory)
Ship RRS Challenger

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameLOIS (RACS) Humber-Tweed Grid HT
CategoryOffshore area
Latitude54° 47.47' N
Longitude0° 52.15' W
Water depth below MSL

LOIS (RACS) Humber-Tweed Grid HT

The Humber-Tweed grid was one of two areas sampled during the LOIS(RACS) project. The measurements collected lie within an area with its centre point at 54.7912N 0.8693W and which stretches from the Humber Estuary to Berwick upon Tweed.

BODC image

CTD casts were performed by several cruises between December 1992 and July 1995.

Other Series linked to this Fixed Station for this cruise - 831702 831714 831726 831738 831911 831923 831935 831947 831959 831960 832219 832220 832232 832244 832256 832268 832281 832373 832385 1285150 1285162 1285174 1285186 1285198 1285205 1285217 1285229 1285230

Other Cruises linked to this Fixed Station (with the number of series) - CH108C (11) CH115A (31) CH115B (4) CH115C (25) CH117A (18) CH117B (3) CH118A (28) CH118B (35) CH118C (20) CH119A (15) CH119B (24) CH119C (28)


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