Search the data

Metadata Report for BODC Series Reference Number 611446


Metadata Summary

Data Description

Data Category Fluorescence or pigments
Instrument Type
NameCategories
Chelsea Technologies Group Aquatracka fluorometer  fluorometers
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator -
Originating Organization University of Wales, Bangor School of Ocean Sciences (now Bangor University School of Ocean Sciences)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) North Sea Project 1987-1992
 

Data Identifiers

Originator's Identifier FL0113.C49A
BODC Series Reference 611446
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1989-04-06 16:39
End Time (yyyy-mm-dd hh:mm) 1989-05-04 18:39
Nominal Cycle Interval 3600.0 seconds
 

Spatial Co-ordinates

Latitude 55.50000 N ( 55° 30.0' N )
Longitude 0.90500 E ( 0° 54.3' E )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 8.5 m
Maximum Sensor or Sampling Depth 8.5 m
Minimum Sensor or Sampling Height 76.5 m
Maximum Sensor or Sampling Height 76.5 m
Sea Floor Depth 85.0 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor or Sampling Depth Datum Sea floor reference - Depth measured as a height above sea floor but converted into a depth relative to the sea surface according to the same datum as used for sea floor depth (applicable to instrument depths not bathymetric depths)
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODERankUnitsTitle
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
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
FVLTAQ011VoltsRaw signal (voltage) of instrument output by in-situ Aquatracka chlorophyll fluorometer

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 Quality Report

For many purposes a degree of uncertainty in the instrument depth has little consequence: there is no doubt that it was deployed in the illuminated mixed layer and at sufficient depth to avoid problems with fluorescence quenching. However, great caution should be exercised if any attempt is made to use the data in calculations which require the light level, and hence the meter depth, to be known accurately.


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

Aquatracka fluorometer

The Chelsea Instruments Aquatracka is a logarithmic response fluorometer. It uses a pulsed (5.5 Hz) xenon light source discharging between 320 and 800 nm through a blue filter with a peak transmission of 420 nm and a bandwidth at half maximum of 100 nm. A red filter with sharp cut off, 10% transmission at 664 nm and 678 nm, is used to pass chlorophyll-a fluorescence to the sample photodiode.

The instrument may be deployed either in a through-flow tank, on a CTD frame or moored with a data logging package.

Further details can be found in the manufacturer's specification sheet.

Data Processing Notes

Logging Procedures

During the deployment the fluorometer was operated on an hourly cycle. In each cycle, the fluorometer was powered up for 10 seconds and flashed for 3 minutes logging a data value every 3 seconds (60 in all). The fluorometer was then powered down until the next logging cycle was due. On recovery the battery logging unit was interfaced to a micro computer and a time stamp, mean voltage and standard deviation was determined for each logging cycle.

Calibration Procedures

The voltage was calibrated in terms of pigment concentration using the following procedure. The dark voltage (F0) was determined before and after deployment by measuring the fluorometer output whilst preventing light entering the detector window. Calibration samples were obtained by mounting the fluorometer on the CTD frame in continuous logging mode and collecting water samples using the CTD rosette.

The extracted pigments (chlorophyll and phaeopigment) were determined on desiccated, frozen samples using a Turner Designs bench fluorometer. Further details are given in Mills and Tett (1990). The pigment concentrations (chlorophyll + w*phaeopigment where w is a weighting factor varied from 0 to 1 to optimise fit) were regressed against transformed fluorometer voltage (F*) where:

  • F* = 10.0**((F-F0)/c2)
  • F = Fluorometer voltage (V)
  • F0 = Dark voltage
  • c2 = Volts per decade output (manufacturer's setting is 2 V per decade)

The slope is the compound fluorescence emission coefficient (E). Pigment concentrations were then calculated from logged transformed voltages using the equation:

  • Pigment concentration (mg/m3) = F*/E

The fluorometer serial no. SA113 was used for both deployments at Survey Site A and for the March deployment at Survey Site E and the fluorometer serial no. SA109 was used for the April deployment at Survey Site E. The calibration of instrument Serial No. SA113 gave values of 0.937 for F0 and 0.683 for E. For logistical reasons, no calibration sample data were available for SA109 and consequently the calibration for SA113 had to be used.

Additional BODC Processing

The time channel data were converted from BST to GMT and gaps were infilled with absent data values. The time series were visually inspected using in house software on a graphics workstation and a small number of points were flagged as suspect.

References

Mills D.K. and Tett P.B. (1990). Use of a Recording fluorometer for continuous measurement of phytoplankton concentration pp106-115 in Environment and pollution measurement sensors and systems (ed. H.O. Nielsen). Proceedings Society of Photo-Optical Instrumentation Engineers (SPIE), 14-15 March 1990, The Hague, Netherlands, Vol.1269, 1990 (198pp).


Project Information

North Sea Project

The North Sea Project (NSP) was the first Marine Sciences Community Research project of the Natural Environment Research Council (NERC). It evolved from a NERC review of shelf sea research, which identified the need for a concerted multidisciplinary study of circulation, transport and production.

The ultimate aim of the NERC North Sea Project was the development of a suite of prognostic water quality models to aid management of the North Sea. To progress towards water quality models, three intermediate objectives were pursued in parallel:

  • Production of a 3-D transport model for any conservative passive constituent, incorporating improved representations of the necessary physics - hydrodynamics and dispersion;
  • Identifying and quantifying non-conservative processes - sources and sinks determining the cycling and fate of individual constituents;
  • Defining a complete seasonal cycle as a database for all the observational studies needed to formulate, drive and test models.

Proudman Oceanographic Laboratory hosted the project, which involved over 200 scientists and support staff from NERC and other Government funded laboratories, as well as seven universities and polytechnics.

The project ran from 1987 to 1992, with marine field data collection between April 1988 and October 1989. One shakedown (CH28) and fifteen survey cruises (Table 1), each lasting 12 days and following the same track, were repeated monthly. The track selected covered the summer-stratified waters of the north and the homogeneous waters in the Southern Bight in about equal lengths together with their separating frontal band from Flamborough head to Dogger Bank, the Friesian Islands and the German Bight. Mooring stations were maintained at six sites for the duration of the project.

Table 1: Details of NSP Survey Cruises on RRS Challenger
Cruise No. Date
CH28 29/04/88 - 15/05/88
CH33 04/08/88 - 16/08/88
CH35 03/09/88 - 15/09/88
CH37 02/10/88 - 14/10/88
CH39 01/11/88 - 13/11/88
CH41 01/12/88 - 13/12/88
CH43 30/12/88 - 12/01/89
CH45 28/01/89 - 10/02/89
CH47 27/02/89 - 12/03/89
CH49 29/03/89 - 10/04/89
CH51 27/04/89 - 09/05/89
CH53 26/05/89 - 07/06/89
CH55 24/06/89 - 07/07/89
CH57 24/07/89 - 06/08/89
CH59 23/08/89 - 04/09/89
CH61 21/09/89 - 03/10/89

Alternating with the survey cruises were process study cruises (Table 2), which investigated some particular aspect of the science of the North Sea. These included fronts (nearshore, circulation and mixing), sandwaves and sandbanks, plumes (Humber, Wash, Thames and Rhine), resuspension, air-sea exchange, primary productivity and blooms/chemistry.

Table 2: Details of NSP Process cruises on RRS Challenger
Cruise No. Date Process
CH34 18/08/88 - 01/09/88 Fronts - nearshore
CH36 16/09/88 - 30/09/88 Fronts - mixing
CH56 08/07/89 - 22/07/89 Fronts - circulation
CH58 07/08/89 - 21/08/89 Fronts - mixing
CH38 24/10/88 - 31/10/88 Sandwaves
CH40 15/11/88 - 29/11/88 Sandbanks
CH42 15/12/88 - 29/12/88 Plumes/Sandbanks
CH46 12/02/89 - 26/02/89 Plumes/Sandwaves
CH44 13/01/89 - 27/01/89 Resuspension
CH52 11/05/89 - 24/05/89 Resuspension
CH60 06/09/89 - 19/09/89 Resuspension
CH48 13/03/89 - 27/03/89 Air/sea exchanges
CH62 05/10/89 - 19/10/89 Air/sea exchanges
CH50 12/04/89 - 25/04/89 Blooms/chemistry
CH54 09/06/89 - 22/06/89 Production

In addition to the main data collection period, a series of cruises took place between October 1989 and October 1990 that followed up work done on previous cruises (Table 3). Process studies relating to blooms, plumes (Humber, Wash and Rhine), sandwaves and the flux of contaminants through the Dover Strait were carried out as well as two `survey' cruises.

Table 3: Details of NSP `Follow up' cruises on RRS Challenger
Cruise No. Date Process
CH62A 23/10/89 - 03/11/89 Blooms
CH64 03/04/90 - 03/05/90 Blooms
CH65 06/05/90 - 17/05/90 Humber plume
CH66A 20/05/90 - 31/05/90 Survey
CH66B 03/06/90 - 18/06/90 Contaminants through Dover Strait
CH69 26/07/90 - 07/08/90 Resuspension/Plumes
CH72A 20/09/90 - 02/10/90 Survey
CH72B 04/10/90 - 06/10/90 Sandwaves/STABLE
CH72C 06/10/90 - 19/10/90 Rhine plume

The data collected during the observational phase of the North Sea Project comprised one of the most detailed sets of observations ever undertaken in any shallow shelf sea at that time.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 1989-04-06
End Date (yyyy-mm-dd) 1989-05-04
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 IdentifierRIG#C49AF
Platform Categorysubsurface mooring

North Sea Project POLRIG#C49AF

Deployment

The fluorometer mooring was deployed as part of the North Sea Project Survey at Site A.

Mooring Position 55° 30.0'N, 000° 54.30'E
Water Depth 85.0 m
Instrument Aquatracka Serial No. 0113

Mooring description

The fluorometer package comprised of an Aquatracka logarithmic response fluorometer and a battery logger unit (BLU) enclosed in a stainless steel protective cage. The package was incorporated into a POL 'U' shaped mooring (a surface toroid buoy at one end and a sub-surface buoy at the other end) suspended between the anchor chain and the sub-surface buoy with three 11 inch trawl floats immediately above the fluorometer.

The position of the fluorometer in the water column is open to question. In the mooring specification a nominal depth of 10m below the sea surface was requested. During inventory compilation, a figure of 7m below sea surface was obtained although subsequent re-investigation has been unable to identify the source of this information. In Mills and Tett (1990) the fluorometer is shown 18m below the surface in a diagram of the mooring, but described as being between 8 and 15m from the surface in the text. A figure of 8.5m (the mean of the two values, 7 and 10 metres, available when the data were prepared) has been used in the headers of the data files.

References

Mills D.K. and Tett P.B. (1990). Use of a Recording fluorometer for continuous measurement of phytoplankton concentration pp106-115 in Environment and pollution measurement sensors and systems (ed. H.O. Nielsen). Proceedings Society of Photo-Optical Instrumentation Engineers (SPIE), 14-15 March 1990, The Hague, Netherlands, Vol.1269, 1990 (198pp).


Fixed Station Information

Fixed Station Information

Station NameNSP Survey A and CTD Site CS
CategoryOffshore location
Latitude55° 30.00' N
Longitude0° 54.00' E
Water depth below MSL85.0 m

North Sea Project Survey Mooring Site A and CTD Site CS

Site A was one of six fixed stations where moorings were deployed during the North Sea Project survey. This location is also one of 123 North Sea Project CTD Sites.

The site was characterised by weak tidal currents, up to a maximum of 0.5 m/s, and the water column was stratified in summer months.

The rigs deployed here lie within a box bounded by co-ordinates 55.493N 0.893E at the southwest corner and 55.563N 0.920E at the northeast corner. Magnetic variation at this site was 4.5° west.

Site A deployment history is summarised below:

Rig ID Meter type Meter height Start date Data return (days) Comment
C33AC

ADCP

CM

0.8m

0.8m

12/08/88

12/08/88

0.0

29.5

Data corrupt

N/A

C33AT THCH   12/08/88 29 Good data
C35AC

ADCP

CM

0.8m

0.8m

10/09/88

10/09/88

0.0

29.3

Data corrupt

N/A

C35AT THCH   10/09/88 30 Good data
C37AC

ADCP

CM

0.8m

0.8m

10/10/88

10/10/88

29.1

29.1

 
C37AT THCH   10/10/88 30 Good data
C39AC

ADCP

CM

0.8m

0.8m

10/11/88

10/11/88

0.0

0.0

Meter lost

Meter lost

C39AT THCH   08/11/88 31 Good data
C43AC

ADCP

CM

0.8m

0.8m

03/01/89

03/01/89

0.0

34.2

Data corrupt

Rig trawled 06/02/89

C47AC ADCP 0.8m 06/03/89 30.7 No CM deployed
C49AC

ADCP

CM

0.8m

0.8m

08/04/89

08/04/89

25.8

0.0

N/A

Data corrupt

C49AT THCH   06/04/89 30 Good data
C49AF FL 76.5 m 06/04/89 29 Instrument height suspect
C51AC

ADCP

CM

0.8m

0.8m

04/05/89

04/05/89

28.0

28.6

 
C51AT THCH   04/05/89 29 Good data
C51AF FL 76.5 m 04/05/89 29 Instrument height suspect
C53AC ADCP 0.8m 02/06/89 28.8 No CM deployed
C53AT THCH   02/06/89 29 Good data
C55AC

ADCP

CM

0.8m

0.8m

01/07/89

01/07/89

33.5

33.5

 
C57AC

ADCP

CM

0.8m

0.8m

04/08/89

04/08/89

4.8

4.8

Rig trawled 09/08/89

Rig trawled 09/08/89

C57AT THCH   04/08/89 21 Good data
C59AC

ADCP

CM

0.8m

0.8m

30/08/89

30/08/89

29.6

0.0

N/A

Data corrupt

C59AT THCH   30/08/89 30 Good data

ADCP = Acoustic Doppler Current Profiler
CM = Current Meter (Aanderaa or S4)
THCH = Thermistor Chain
FL = Fluorometer

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: NSP Survey A and CTD Site CS

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
781629CTD or STD cast1988-05-13 18:34:0052.41667 N, 2.99017 ERRS Challenger CH28
769679CTD or STD cast1988-08-12 06:31:0055.5015 N, 0.90483 ERRS Challenger CH33
579900Hydrography time series at depth1988-08-12 07:40:0455.4993 N, 0.9 ENot applicable
604787Hydrography time series at depth1988-08-12 08:31:5255.5067 N, 0.8983 ENot applicable
769680CTD or STD cast1988-08-12 09:47:0055.50617 N, 0.89983 ERRS Challenger CH33
769920CTD or STD cast1988-08-14 05:23:0055.50017 N, 0.89883 ERRS Challenger CH33
783777CTD or STD cast1988-09-10 21:27:0055.50583 N, 0.898 ERRS Challenger CH35
604855Hydrography time series at depth1988-09-10 22:41:1755.5075 N, 0.893 ENot applicable
579997Hydrography time series at depth1988-09-10 22:50:0455.4987 N, 0.9015 ENot applicable
783789CTD or STD cast1988-09-10 22:56:0055.497 N, 0.9005 ERRS Challenger CH35
784639CTD or STD cast1988-10-10 03:47:0055.496 N, 0.89733 ERRS Challenger CH37
784640CTD or STD cast1988-10-10 04:35:0055.49733 N, 0.89533 ERRS Challenger CH37
604843Hydrography time series at depth1988-10-10 09:20:3655.5137 N, 0.9052 ENot applicable
579948Hydrography time series at depth1988-10-10 09:30:0055.5057 N, 0.9052 ENot applicable
603944Currents -subsurface Eulerian1988-10-10 09:38:4955.5057 N, 0.9052 ENot applicable
821990CTD or STD cast1988-11-08 13:57:0055.497 N, 0.9015 ERRS Challenger CH39
604831Hydrography time series at depth1988-11-08 15:30:0755.5622 N, 0.9115 ENot applicable
822213CTD or STD cast1988-11-10 17:39:0055.50067 N, 0.90167 ERRS Challenger CH39
785422CTD or STD cast1988-12-09 03:11:0055.49817 N, 0.8965 ERRS Challenger CH41
786216CTD or STD cast1989-01-02 23:06:0055.499 N, 0.90083 ERRS Challenger CH43
579912Hydrography time series at depth1989-01-03 00:19:5955.4942 N, 0.9077 ENot applicable
793041CTD or STD cast1989-03-06 19:02:0055.49383 N, 0.8965 ERRS Challenger CH47
1857782Water sample data1989-03-06 19:07:0055.49387 N, 0.89657 ERRS Challenger CH47
793053CTD or STD cast1989-03-06 19:29:0055.49467 N, 0.89983 ERRS Challenger CH47
1857794Water sample data1989-03-06 19:32:0055.49463 N, 0.89988 ERRS Challenger CH47
603888Currents -subsurface Eulerian1989-03-06 21:18:4355.4933 N, 0.8953 ENot applicable
794289CTD or STD cast1989-04-06 10:04:0055.5125 N, 0.90283 ERRS Challenger CH49
1858969Water sample data1989-04-06 10:09:0055.51245 N, 0.90281 ERRS Challenger CH49
794290CTD or STD cast1989-04-06 13:55:0055.49783 N, 0.90767 ERRS Challenger CH49
1858970Water sample data1989-04-06 13:59:0055.49791 N, 0.9077 ERRS Challenger CH49
604775Hydrography time series at depth1989-04-06 16:40:3855.5 N, 0.9057 ENot applicable
794308CTD or STD cast1989-04-06 17:11:0055.502 N, 0.92333 ERRS Challenger CH49
1858982Water sample data1989-04-06 17:16:0055.50195 N, 0.92326 ERRS Challenger CH49
794542CTD or STD cast1989-04-08 20:56:0055.49683 N, 0.90117 ERRS Challenger CH49
1859229Water sample data1989-04-08 21:01:0055.49689 N, 0.90119 ERRS Challenger CH49
603796Currents -subsurface Eulerian1989-04-08 23:38:3455.4993 N, 0.9188 ENot applicable
795397CTD or STD cast1989-05-04 21:50:0055.5025 N, 0.90217 ERRS Challenger CH51
1861222Water sample data1989-05-04 22:03:0055.50246 N, 0.90224 ERRS Challenger CH51
611458Fluorescence or pigments1989-05-04 22:46:0055.5 N, 0.92 ENot applicable
604818Hydrography time series at depth1989-05-04 23:18:5255.498 N, 0.9107 ENot applicable
579936Hydrography time series at depth1989-05-04 23:30:0355.4998 N, 0.92 ENot applicable
795404CTD or STD cast1989-05-04 23:48:0055.49917 N, 0.89783 ERRS Challenger CH51
1861234Water sample data1989-05-05 00:02:0055.49921 N, 0.89781 ERRS Challenger CH51
603919Currents -subsurface Eulerian1989-05-05 09:18:4755.4998 N, 0.92 ENot applicable
796769CTD or STD cast1989-06-02 15:16:0055.49583 N, 0.911 ERRS Challenger CH53
1863787Water sample data1989-06-02 15:24:0055.49588 N, 0.91107 ERRS Challenger CH53
796770CTD or STD cast1989-06-02 17:55:0055.50017 N, 0.9005 ERRS Challenger CH53
1863799Water sample data1989-06-02 18:01:0055.50024 N, 0.90044 ERRS Challenger CH53
604806Hydrography time series at depth1989-06-02 19:22:3055.5003 N, 0.901 ENot applicable
603852Currents -subsurface Eulerian1989-06-02 19:28:5255.4993 N, 0.8987 ENot applicable
796782CTD or STD cast1989-06-02 19:30:0055.4995 N, 0.89733 ERRS Challenger CH53
1863806Water sample data1989-06-02 19:37:0055.49948 N, 0.89733 ERRS Challenger CH53
798069CTD or STD cast1989-07-01 15:47:0055.50483 N, 0.90417 ERRS Challenger CH55
1656985Water sample data1989-07-01 15:54:0055.50478 N, 0.9042 ERRS Challenger CH55
1866263Water sample data1989-07-01 15:54:0055.50478 N, 0.9042 ERRS Challenger CH55
591671Currents -subsurface Eulerian1989-07-01 16:38:0055.4998 N, 0.9053 ENot applicable
603839Currents -subsurface Eulerian1989-07-01 16:38:3555.4998 N, 0.9053 ENot applicable
799602CTD or STD cast1989-08-04 03:47:0055.4975 N, 0.909 ERRS Challenger CH57
1865260Water sample data1989-08-04 03:51:0055.49747 N, 0.90897 ERRS Challenger CH57
799614CTD or STD cast1989-08-04 04:08:0055.49883 N, 0.90217 ERRS Challenger CH57
1246439Water sample data1989-08-04 04:13:0055.49884 N, 0.90209 ERRS Challenger CH57
1709895Water sample data1989-08-04 04:13:0055.49884 N, 0.90209 ERRS Challenger CH57
1865272Water sample data1989-08-04 04:13:0055.49884 N, 0.90209 ERRS Challenger CH57
604799Hydrography time series at depth1989-08-04 05:19:2255.5017 N, 0.9117 ENot applicable
603803Currents -subsurface Eulerian1989-08-04 05:38:2555.5017 N, 0.905 ENot applicable
591658Currents -subsurface Eulerian1989-08-04 05:39:0055.5017 N, 0.905 ENot applicable
801940CTD or STD cast1989-08-30 15:46:0055.50217 N, 0.917 ERRS Challenger CH59
1856649Water sample data1989-08-30 15:53:0055.50223 N, 0.91704 ERRS Challenger CH59
604867Hydrography time series at depth1989-08-30 16:28:0855.5017 N, 0.92 ENot applicable
603968Currents -subsurface Eulerian1989-08-30 16:48:4555.501 N, 0.9127 ENot applicable
802193CTD or STD cast1989-09-01 15:32:0055.49883 N, 0.89917 ERRS Challenger CH59
1856883Water sample data1989-09-01 15:38:0055.49878 N, 0.89912 ERRS Challenger CH59
800592CTD or STD cast1989-09-29 04:41:0055.49833 N, 0.905 ERRS Challenger CH61
1855370Water sample data1989-09-29 04:48:0055.49841 N, 0.90497 ERRS Challenger CH61
803319CTD or STD cast1990-05-28 17:51:0055.49733 N, 0.89833 ERRS Challenger CH66A
805105CTD or STD cast1990-09-30 05:25:0055.501 N, 0.8965 ERRS Challenger CH72A