Metadata Report for BODC Series Reference Number 518118
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
Data Description |
|||||||||||||||||||||||||
|
|||||||||||||||||||||||||
Data Identifiers |
|||||||||||||||||||||||||
|
|||||||||||||||||||||||||
Time Co-ordinates(UT) |
|||||||||||||||||||||||||
|
|||||||||||||||||||||||||
Spatial Co-ordinates | |||||||||||||||||||||||||
|
|||||||||||||||||||||||||
Parameters |
|||||||||||||||||||||||||
|
|||||||||||||||||||||||||
|
Problem Reports
A drop in bottom pressure of 0.5 m occurred on 04/10/1998 at 22:00.
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
Aanderaa Water Level Recorder Model 7
The Water Level Recorder (WLR) model 7 is a self-contained, high precision instrument specifically designed for recording of ocean water levels through precise measurement of hydrostatic pressure. The WLR records pressure, temperature and conductivity (optional) at regular intervals, enabling precise variations in water level to be calculated. The pressure sensor consists of an oscillating quartz crystal which shifts frequency with the force applied to it. Temperature is measured by a Fenwall thermistor.
The data from the WLR7 are stored in a solid-state data storage unit (DSU) which can store up to 65,500 ten bit, PDC-4 coded words in a set of EEPROMS. Click the link for further details on theWLR7.
Specifications
Pressure
Oscillator Frequency | 36-40 kHz |
---|---|
Resolution | 0.001% of range |
Repeatability | ± 0.01% of full scale |
Integration | 40 s |
Ranges available | 0 - 700 kPA (60 m) (standard) 0 - 3500 kPa (340 m) (standard) |
Temperature
The thermistor is a Fenwall GB32JM19
Range | -3 °C to +35 °C |
---|---|
Accuracy | ± 0.1 °C |
Resolution | 0.04 °C |
Response Time | 30 s |
Conductivity (optional)
Sensor Type | Conductivity Cell 3094 |
---|---|
Ranges | 0 - 77 mmho cm-1 (standard) 0 - 42 mmho cm-1 (on request) |
Accuracy | ± 0.25 mmho cm-1 |
Resolution | 0.1% of range |
Further details can be found in the manufacturer's specification sheet.
Offshore Sea Floor Pressure Data Screening Carried Out by BODC
BODC screen both the series header qualifying information and the parameter values in the data cycles themselves.
Header information is inspected for:
-
Irregularities such as suspect values.
-
Inconsistencies between related information, for example depths of meter and sea bed; times of mooring deployment and for start/end of data series; length of record or number of data cycles, the cycle interval, the clock error and the period over which accrued; originator's comments on meter/mooring performance, data quality and parameters measured and the parameters actually present in the data cycles. Documents are written by BODC highlighting irregularities which cannot be resolved.
Data cycles are inspected via time series plots of parameters. These plots undergo intrinsic and extrinsic screening to detect suspect values within the data cycles themselves and inconsistencies when compared with adjacent data sets. Values suspected of being of non oceanographic origin may be tagged with the BODC flag denoting suspect value.
The following types of irregularity, each relying on visual detection in the time series plot, are amongst those which may be flagged as suspect:
-
Spurious data at the start or end of the record.
-
Obvious spikes of non oceanographic origin.
-
A sequence of constant values in consecutive data cycles.
If a large percentage of the data are affected by irregularities, deemed abnormal, then instead of flagging the individual suspect values, a caution may be documented.
Inconsistencies between the characteristics of the data set and those of its neighbours, as for example between the maximum and minimum values of the parameters (spikes excluded) are, where necessary, documented.
This intrinsic and extrinsic screening of the parameter values seeks to confirm the qualifying information and the source laboratory's comments on the series. In screening and collating information, every care is taken to ensure that errors of BODC making are not introduced.
Project Information
PROcesses of Vertical Exchange in Shelf Seas (PROVESS)
Introduction
PROVESS was an interdisciplinary study of the vertical fluxes of properties through the water column and the surface and bottom boundary layers. The project was funded by the European Community MAST-III programme (MAS3-CT97- 0159) and ran from March 1998 to May 2001.
Scientific Rationale
PROVESS was based on the integration of experimental, theoretical and modelling studies with the aim of improving understanding and quantification of vertical exchange processes in the water column, in particular in the surface and benthic boundary layers and across the> pycnocline. PROVESS also explored mechanisms of physical-biological coupling in which vertical exchanges and turbulence significantly affect the environmental conditions experienced by the biota with particular reference to aggregation, flocculation, sedimentation and trophic interactions.
Fieldwork
The experimental phase of the project was carried out at two contrasting sites in the North Sea: the northern North Sea site (NNS) and the southern North Sea site (SNS).
The two sites had the following characteristics:
SNS | NNS | |
---|---|---|
Position | 52° 15.0' N, 4° 17.0' E | 59° 20.0' E, 1° 00.0' E |
Time of year | April-May | September-November |
Water depth (m) | 16 | 100 |
M2 max amplitude (m s-1) | 0.75 | 0.15 |
Max current (m s-1) | 1.0 | 0.6 |
Delta T (deg C) | mixed | 7-1 |
Thermocline depth (m) | mixed | 35-100 |
Delta S | 1 | small |
Halocline depth (m) | 5-10 | cf. thermocline depth |
Max wind speed (m s-1) | 20 | 25 |
Max wave height (m) | 5 | 10 |
Max wave period (s) | 8 | 10 |
Internal motion | No | Yes |
Sediment | muddy-sand | muddy-sand |
Biology | eutrophic | oligotrophic |
At both locations measurements were concentrated at a central position with additional measurements being made to estimate horizontal gradients. Moored instruments (including current meters, temperature and pressure sensors, fluorometers, transmissometers, nutrient analysers and meteorological sensors) were deployed between 7 September and 5 November 1998 at the NNS and between 29 March and 25 May 1999 at the SNS. Each experiment was supported by intensive measurement series made from oceanographic ships and involving turbulence dissipation profiler CTD, particle size profilers, optical profilers, benthic sampling and water bottle sampling.
Details of the cruises were as follows:
Site | Ship (nationality) | Cruise Mnemonic | Date |
---|---|---|---|
NNS | Valdivia (GER) | VA174 | 5 - 17 Sep 1998 |
Dana (DK) | D1198 | 14 - 26 Oct 1998 | |
Pelagia (NL) | PE125 | 19 - 30 Oct 1998 | |
Challenger (UK) | CH140 | 22 Oct - 9 Nov 1998 | |
SNS | Pelagia (NL) | PE135 | 29 Mar - 9 Apr 1999 |
Mitra (NL) | MT0499 | 19 - 30 Apr 1999 | |
Belgica (BE) | BG9912 | 17 - 21 May 1999 |
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 1998-09-08 |
End Date (yyyy-mm-dd) | 1998-11-02 |
Organization Undertaking Activity | Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool) |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | POLRIG#790 |
Platform Category | fixed benthic node |
PROVESS Project POLRIG#790
This mooring was also known within PROVESS as 'Rig A'. It was one of a cluster of moorings deployed at the main focus of the Northern North Sea Site in the autumn of 1998. The rig was deployed by FS Valdivia (cruise #174) in September 1998 and recovered by RRS Challenger (cruise #140) in October/November 1998.
Mooring type | Seabed lander (Doppler frame D3) |
---|---|
Instruments (0.5 m above seabed) | 150 kHz RDI Broad Band ADCP (22 bins every 4 m, bin1 at 11 m above seabed) Bottom Pressure Recorder Temperature Probe Minilog |
Note: bottom pressure record shows that the frame moved between 4 and 5 Oct 1998.
Related Data Activity activities are detailed in Appendix 1
Cruise
Cruise Name | VLD174 (PROVESS N-1) |
Departure Date | 1998-09-05 |
Arrival Date | 1998-09-17 |
Principal Scientist(s) | Gunther Krause (Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research) |
Ship | Valdivia |
Complete Cruise Metadata Report is available here
Fixed Station Information
Fixed Station Information
Station Name | PROVESS Northern North Sea Site |
Category | Offshore area |
Latitude | 59° 18.00' N |
Longitude | 1° 0.00' E |
Water depth below MSL | 110.0 m |
PROVESS Northern North Sea Site
Nineteen mooring packages were deployed at PROVESS Northern North Sea site during the cruise Valdivia VA174 in September 1998. The layout of the mooring assemblage was L-shaped. It consisted of an heavily-instrumented site centred close to 59° 20' N, 1° 00'E (Site A with rigs A, B, Ca/b, D, E, Fa/b, G, H, I, J1, J2 and L) and secondary single-rig sites extending up to 40 km north (V and Y) and east (U and X). An addition mooring package, NIOZ or Rig M, was also deployed at Site A during the RV Pelagia PE125 cruise in October 1998.
Rigs Ca/b and Fa/b were two short-term rigs which were recovered at the end of the cruise VA174 and redeployed during the cruise Challenger CH140 in October. All the other rigs were recovered during the cruise CH140 in October-November 1998 apart from rigs H and L which could not be found and rig Cb which was trawled and recovered from Peterhead (Scotland).
The layout of the mooring array was:
Mooring data
The data returned from each rig were as follows:
Rig identifier | Data | |
---|---|---|
A | POLRIG#790 | ADCP currents Water level Near-bed temperature |
B | POLRIG#791 | ADCP currents Near-bed temperature |
Ca | POLRIG#792 | Near-bed temperature |
Cb | POLRIG#808 | Rig trawled, no data returned |
D | POLRIG#793 | Currents Temperature, salinity and attenuance |
E | POLRIG#794 | Currents |
Fa | POLRIG#795 | Currents |
Fb | POLRIG#809 | |
NIOZ | Unknown | Thermistor chain |
G | POLRIG#796 | Meteorology |
H | POLRIG#797 | Mooring lost, no data returned |
I | POLRIG#798 | Surface attenuance, nutrients and chlorophyll |
J1 | POLRIG#799 | Mid-water attenuance, nutrients and chlorophyll |
J2 | POLRIG#800 | Near-bed attenuance, nutrients and chlorophyll |
L | POLRIG#801 | Mooring lost, no data returned |
R | POLRIG#802 | Water column temperature |
S | POLRIG#803 | Water column temperature |
U | POLRIG#804 | ADCP currents Water level Near-bed temperature |
V | POLRIG#805 | ADCP currents Near-bed temperature |
X | POLRIG#806 | Water level |
Y | POLRIG#807 |
CTD data
A total of 352 CTD casts were also collected during the four cruises surveying this area. These include:
Cruise identifier | Cruise dates | No. of CTD casts |
---|---|---|
FS Valdivia (#174) | 05 September - 17 September 1998 | 168 |
Dana (#1198) | 14 October - 26 October 1998 | 51 |
RV Pelagia (#125) | 19 October - 30 October 1998 | 73 |
RRS Challenger (#140) | 21 October - 11 November 1998 | 60 |
Additonal data
Complementary meteorological and sea state data for PROVESS Northern North Sea Experiment were obtained from Marine Weather Stations located on Beryl and Frigg oil platforms in the Northern North Sea.
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 |
B | nominal value |
Q | value below limit of quantification |
Appendix 1: POLRIG#790
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 Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
517729 | Hydrography time series at depth | 1998-09-08 09:10:00 | 59.3283 N, 1.0037 E | Valdivia VLD174 (PROVESS N-1) |
524947 | Currents -subsurface Eulerian | 1998-09-08 09:14:59 | 59.3283 N, 1.0037 E | Valdivia VLD174 (PROVESS N-1) |
Appendix 2: PROVESS Northern North Sea Site
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 Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
529208 | Meteorology -meteorological data buoy | 1998-09-06 12:42:00 | 59.3435 N, 0.9955 E | Valdivia VLD174 (PROVESS N-1) |
518087 | Hydrography time series at depth | 1998-09-07 10:30:27 | 59.332 N, 1.6715 E | Valdivia VLD174 (PROVESS N-1) |
517766 | Hydrography time series at depth | 1998-09-07 11:40:00 | 59.333 N, 1.4178 E | Valdivia VLD174 (PROVESS N-1) |
518106 | Hydrography time series at depth | 1998-09-07 11:40:27 | 59.333 N, 1.4178 E | Valdivia VLD174 (PROVESS N-1) |
524935 | Currents -subsurface Eulerian | 1998-09-07 11:45:00 | 59.333 N, 1.4178 E | Valdivia VLD174 (PROVESS N-1) |
541883 | Currents -subsurface Eulerian | 1998-09-08 06:59:13 | 59.3312 N, 1.001 E | Valdivia VLD174 (PROVESS N-1) |
524173 | Hydrography time series at depth | 1998-09-08 07:05:00 | 59.3312 N, 1.001 E | Valdivia VLD174 (PROVESS N-1) |
517729 | Hydrography time series at depth | 1998-09-08 09:10:00 | 59.3283 N, 1.0037 E | Valdivia VLD174 (PROVESS N-1) |
524947 | Currents -subsurface Eulerian | 1998-09-08 09:14:59 | 59.3283 N, 1.0037 E | Valdivia VLD174 (PROVESS N-1) |
517730 | Hydrography time series at depth | 1998-09-08 11:35:00 | 59.3237 N, 1.0013 E | Valdivia VLD174 (PROVESS N-1) |
524923 | Currents -subsurface Eulerian | 1998-09-08 12:22:30 | 59.3257 N, 0.9998 E | Valdivia VLD174 (PROVESS N-1) |
517742 | Hydrography time series at depth | 1998-09-08 12:30:00 | 59.3257 N, 0.9998 E | Valdivia VLD174 (PROVESS N-1) |
518099 | Hydrography time series at depth | 1998-09-08 15:10:26 | 59.75 N, 1.0013 E | Valdivia VLD174 (PROVESS N-1) |
524204 | Transmittance/attenuance, turbidity, or SPM conc. | 1998-09-09 07:35:00 | 59.3228 N, 1.0108 E | Valdivia VLD174 (PROVESS N-1) |
541951 | Fluorescence or pigments | 1998-09-09 08:00:00 | 59.3228 N, 1.0108 E | Valdivia VLD174 (PROVESS N-1) |
541963 | Fluorescence or pigments | 1998-09-09 08:00:00 | 59.3228 N, 1.0108 E | Valdivia VLD174 (PROVESS N-1) |
524751 | Currents -subsurface Eulerian | 1998-09-09 10:05:00 | 59.3202 N, 1.0003 E | Valdivia VLD174 (PROVESS N-1) |
524763 | Currents -subsurface Eulerian | 1998-09-09 10:05:00 | 59.3202 N, 1.0003 E | Valdivia VLD174 (PROVESS N-1) |
541914 | Water column chemistry | 1998-09-09 10:08:40 | 59.3228 N, 1.0108 E | Valdivia VLD174 (PROVESS N-1) |
524775 | Currents -subsurface Eulerian | 1998-09-09 12:26:00 | 59.3183 N, 0.9998 E | Valdivia VLD174 (PROVESS N-1) |
524799 | Currents -subsurface Eulerian | 1998-09-09 12:26:00 | 59.3183 N, 0.9998 E | Valdivia VLD174 (PROVESS N-1) |
517754 | Hydrography time series at depth | 1998-09-09 16:30:00 | 59.5767 N, 0.9933 E | Valdivia VLD174 (PROVESS N-1) |
524959 | Currents -subsurface Eulerian | 1998-09-09 16:35:00 | 59.5767 N, 0.9933 E | Valdivia VLD174 (PROVESS N-1) |
541975 | Fluorescence or pigments | 1998-09-09 18:00:00 | 59.3292 N, 1.0088 E | Valdivia VLD174 (PROVESS N-1) |
524185 | Currents -subsurface Eulerian | 1998-09-09 18:05:04 | 59.3292 N, 1.0088 E | Valdivia VLD174 (PROVESS N-1) |
553128 | Water column chemistry | 1998-09-09 19:39:23 | 59.3292 N, 1.0088 E | Valdivia VLD174 (PROVESS N-1) |
524197 | Currents -subsurface Eulerian | 1998-09-10 09:45:04 | 59.3262 N, 1.0112 E | Valdivia VLD174 (PROVESS N-1) |
541987 | Fluorescence or pigments | 1998-09-10 10:00:00 | 59.3262 N, 1.0112 E | Valdivia VLD174 (PROVESS N-1) |
517613 | Hydrography time series at depth | 1998-09-10 12:25:00 | 59.3333 N, 1.0833 E | Valdivia VLD174 (PROVESS N-1) |
517625 | Hydrography time series at depth | 1998-09-10 12:25:00 | 59.3333 N, 1.0833 E | Valdivia VLD174 (PROVESS N-1) |
517637 | Hydrography time series at depth | 1998-09-10 12:25:00 | 59.3333 N, 1.0833 E | Valdivia VLD174 (PROVESS N-1) |
517649 | Hydrography time series at depth | 1998-09-10 12:25:00 | 59.3333 N, 1.0833 E | Valdivia VLD174 (PROVESS N-1) |
529233 | Hydrography time series at depth | 1998-09-10 12:25:04 | 59.3333 N, 1.0833 E | Valdivia VLD174 (PROVESS N-1) |
517650 | Hydrography time series at depth | 1998-09-10 14:20:00 | 59.3742 N, 1.0 E | Valdivia VLD174 (PROVESS N-1) |
517662 | Hydrography time series at depth | 1998-09-10 14:20:00 | 59.3742 N, 1.0 E | Valdivia VLD174 (PROVESS N-1) |
517674 | Hydrography time series at depth | 1998-09-10 14:20:00 | 59.3742 N, 1.0 E | Valdivia VLD174 (PROVESS N-1) |
517686 | Hydrography time series at depth | 1998-09-10 14:20:00 | 59.3742 N, 1.0 E | Valdivia VLD174 (PROVESS N-1) |
517698 | Hydrography time series at depth | 1998-09-10 14:20:00 | 59.3742 N, 1.0 E | Valdivia VLD174 (PROVESS N-1) |
517705 | Hydrography time series at depth | 1998-09-10 14:20:00 | 59.3742 N, 1.0 E | Valdivia VLD174 (PROVESS N-1) |
517717 | Hydrography time series at depth | 1998-09-10 14:20:00 | 59.3742 N, 1.0 E | Valdivia VLD174 (PROVESS N-1) |
529221 | Hydrography time series at depth | 1998-09-10 14:20:04 | 59.3742 N, 1.0 E | Valdivia VLD174 (PROVESS N-1) |
564231 | Hydrography time series at depth | 1998-10-21 14:11:54 | 59.3175 N, 1.0087 E | RV Pelagia PE125 |
524787 | Currents -subsurface Eulerian | 1998-10-24 09:44:00 | 59.312 N, 0.9967 E | RRS Challenger CH140 (PROVESS N-4) |
524806 | Currents -subsurface Eulerian | 1998-10-24 09:44:00 | 59.312 N, 0.9967 E | RRS Challenger CH140 (PROVESS N-4) |