Metadata Report for BODC Series Reference Number 529208


Metadata Summary

Data Description

Data Category Meteorology -meteorological data buoy
Instrument Type Meteorological measurements with instrument aid
Instrument Mounting moored surface buoy
Originating Country Netherlands
Originator -
Originating Organization Royal Netherlands Institute for Sea Research
Processing Status banked
Project(s) Provess
 

Data Identifiers

Originator's Identifier me0001.796
BODC Series Reference 529208
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1998-09-06 12:42
End Time (yyyy-mm-dd hh:mm) 1998-10-16 09:52
Nominal Cycle Interval 600.0 seconds
 

Spatial Co-ordinates

Latitude 59.34350 N ( 59° 20.6' N )
Longitude 0.99550 E ( 0° 59.7' E )
Positional Uncertainty 0.1 to 0.5 n.miles
Minimum Sensor Depth 0.0 m
Maximum Sensor Depth 0.0 m
Minimum Sensor Height 111.0 m
Maximum Sensor Height 111.0 m
Sea Floor Depth 111.0 m
Sensor Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

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)
CDTASS01 1 Degrees Celsius AirTemp Temperature of the atmosphere by dry bulb thermometer
CRELSS01 1 Percent Air_RelHumid Relative humidity of the atmosphere by humidity sensor
CSLRR101 1 Watts per square metre Solar_rad Downwelling vector irradiance as energy (solar (300-3000nm) wavelengths) in the atmosphere by pyranometer
EGTSSS01 1 Metres per second GustWindSpd_anemom Wind speed (gust) in the atmosphere by in-situ anemometer
EWDASS01 1 Degrees True WindDirFrom Wind from direction in the atmosphere by in-situ anemometer
EWSBSS01 1 Metres per second WindSpd Wind speed in the atmosphere by in-situ anemometer
HEADCM01 1 Degrees Platform_Heading Orientation (horizontal relative to true north) of measurement device {heading}
NRADR101 1 Watts per square metre NetRad Nett radiative flux as energy (300-600 nm wavelengths) in the atmosphere by radiometer
 

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

The wind direction data from this deployment are not valid. A rope caught on the direction vane during the deployment of the mooring. Comparison with concomitant wind direction data from met stations on the nearby Beryl and Frigg oil rigs shows that this incident hindered the good functioning of the met buoy wind direction sensor for the totality of the deployment.


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

Meteorological Buoy

The meteorological monitoring buoy consisted of a large surface toroid buoy secured at the sea floor by an anchor chain and surmounted by a light metal tower. The structure of the tower included a sail and a metal rail for instrument mountings (at an approximate distance of 2 m above sea surface).

Instrumentation

Aanderaa wind direction sensor 3590 (averaging) and buoy orientation sensor 2864

The wind direction sensor consists of a light wind vane mounted on a pivot on top of a housing. The housing is fitted with a built-in compass which is magnetically coupled to the vane. True wind speed measurement is obtained by combining measurements from the wind direction sensor and from the buoy orientation sensor.

Manufacturer's specifications for the wind direction sensor:

Threshold speed <0.3 m/s
Accuracy better than ±5 degrees
Temperature -40 to +50 °C

Manufacturer's specifications for the buoy orientation sensor:

Accuracy better than ±5 degrees
Temperature -40 to +50 °C

Aanderaa wind speed sensor 2740

This sensor measures the average and maximum wind speed (gust) during the sampling interval. It consists of a three cup rotor on top of an aluminium housing. The rotor bearings consists of two stainless steel ball bearings protected by a surrounding skirt. The lower end of the skirt is furnished with a magnet. The magnet's rotation is sensed by a reed switch located into the housing. The sensor has two output signals: average and maximum wind speed (gust). The arithmetic mean of the wind is obtained regardless of sampling interval providing the sampling interval is between 4 seconds and 36 hours. The maximum wind speed is the highest speed occurring over a two-second period at any time during the sampling interval.

Manufacturer's specifications:

Threshold speed 30-50 cm/s
Range up to 76 m/s
Accuracy ±2% or ±20 cm/s (whichever is greater)
Operating temperature -40 to +50 °C

Aanderaa relative humidity sensor 3445

This sensor consists of a RH probe (model 3447) protected from direct sunshine and rains by a radiation screen.

Manufacturer's specifications:

Range 0 to 100% relative humidity (RH)
Accuracy ±3% RH
Resolution 0.1%
Operating temperature -30 to +50 °C

Aanderaa air temperature sensor 3455

This sensor consists of a platinum resistance thermometer protected from heating by direct sunshine by a radiation screen.

Manufacturer's specifications:

Range -44 to +49 °C
Resolution 0.1% of range
Accuracy ±0.1% of range

Aanderaa solar radiation sensor 2770

This sensor measures incoming solar and sky radiations. The sensor employs a high sensitivity thermistor bridge which measures the temperature rise of a black surface under a borosilicate glass dome.

Manufacturer's specifications:

Wavelength 0.3 to 2.5 microns
Range 0 - 2000 W/m 2
Accuracy > ±20 W/m 2
Resolution 4 W/m 2

Aanderaa net radiation sensor 2811 (Pyrradiometer)

This sensor measures the difference between incoming and outgoing radiation (both sunlight and infrared) at the Earth's surface. The sensor consists of a radiation detector composed of two surfaces which absorb/emit radiation, inside an aluminium housing covered at one end by a teflon dome. One surface is exposed to radiation and the other is shielded inside the sensor housing. A thermistor-resistor network senses the temperature difference between the two surfaces of the detector giving a measure of net radiation.

Manufacturer's specifications

Wavelength 0.3 to 60 microns
Range ±2000 W/m 2
Accuracy ±1% of full scale
Resolution 4 W/m 2
Operating temperature -30 to +50 °C

Data Quality Notes

From the start of the record to 01 October 1998, the wind speed values were generally low compared to wind speeds recorded by the weather stations on the Beryl and Frigg oil platforms. When excessive differences were observed, the wind speed recorded by the sensor on the met buoy was flagged as suspect. After 01 October 1998 the three records show good agreement.

Meteorological Buoy Data Processing

Data Originator's Processing

Raw data readings were converted to engineering units using factory calibrations. The calibration equations applied were as follow:

where N is the datalogger reading.

BODC's Data Processing and Quality Control

BODC screen both the series header information and the parameter values in the data cycles.

Header information is inspected for:

  1. Irregularities such as suspect values.
  2. Inconsistencies between related information, for example:
    • Times for 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.
    • Parameters expected and the parameters actually present in the data cycles.
  3. Originator's comments on meter/mooring performance and data quality.

Documents are written by BODC highlighting irregularities which cannot be resolved.

Data cycles are inspected using time series plots of all parameters. Values suspected of being of unnatural origin may be tagged with BODC flag for suspect value.


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) 1998-09-06
End Date (yyyy-mm-dd) 1998-11-16
Organization Undertaking ActivityProudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierPOLRIG#796
Platform Categorymoored surface buoy

PROVESS Project POLRIG#796

This mooring was also known within PROVESS as 'Rig G'. 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 Meteorological buoy with 8' surface toroid buoy
Instruments Net radiation sensor
Wind direction
Wind speed
Relative humidity
Air temperature
Solar radiation
Buoy orientation

Notes:

  1. All sensors and loggers owned by Nederlands Instituut voor Onderzoek der Zee (NIOZ), Texel, Netherlands.
  2. Wind direction fin caught up in grappler rope for all of the deployment.
  3. Complementary met data also available from the Beryl and Frigg oil rig meteorological stations ( 59° 33.99' N 01°32.00' E and 59° 54.00' N 02° 06.00' E respectively).

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 FS Valdivia

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NamePROVESS Northern North Sea Site
CategoryOffshore area
Latitude59° 18.00' N
Longitude1° 0.00' E
Water depth below MSL110.0 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:

BODC image

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.

Other Series linked to this Fixed Station for this cruise - 517613 517625 517637 517649 517650 517662 517674 517686 517698 517705 517717 517729 517730 517742 517754 517766 518087 518099 518106 518118 524173 524185 524197 524204 524751 524763 524775 524799 524923 524935 524947 524959 529221 529233 541883 541914 541951 541963 541975 541987 553128

Other Cruises linked to this Fixed Station (with the number of series) - CH140 (PROVESS N-4) (2) PE125 (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