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Metadata Report for BODC Series Reference Number 1761313


Metadata Summary

Data Description

Data Category Meteorology -unspecified
Instrument Type
NameCategories
Vaisala HMP temperature and humidity sensor  meteorological packages
Vaisala PTB100 barometric pressure sensor  meteorological packages
Gill Windsonic anemometer  anemometers
Kipp and Zonen CM6B pyranometer  radiometers
Skye Instruments SKE510 PAR energy sensor  radiometers
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Alex Forryan
Originating Organization National Oceanography Centre, Southampton
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) OSMOSIS
 

Data Identifiers

Originator's Identifier JC090_PRODQXF_MET
BODC Series Reference 1761313
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2013-09-01 00:00
End Time (yyyy-mm-dd hh:mm) 2013-09-14 23:59
Nominal Cycle Interval 30.0 seconds
 

Spatial Co-ordinates

Southernmost Latitude 42.60383 N ( 42° 36.2' N )
Northernmost Latitude 49.00200 N ( 49° 0.1' N )
Westernmost Longitude 16.35967 W ( 16° 21.6' W )
Easternmost Longitude 10.33417 W ( 10° 20.1' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth -19.4 m
Maximum Sensor or Sampling Depth -18.48 m
Minimum Sensor or Sampling Height -
Maximum Sensor or Sampling Height -
Sea Floor Depth -
Sea Floor Depth Source -
Sensor or Sampling Distribution Scattered at fixed depths - The sensors are scattered with respect to depth but each remains effectively at the same depth for the duration of the series
Sensor or Sampling Depth Datum Approximate - Depth is only approximate
Sea Floor Depth Datum -
 

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)
ALATGP011DegreesLatitude north relative to WGS84 by unspecified GPS system
ALONGP011DegreesLongitude east relative to WGS84 by unspecified GPS system
CAPHZZ011MillibarsPressure (measured variable) exerted by the atmosphere
CDTASS011Degrees CelsiusTemperature of the atmosphere by dry bulb thermometer
CRELSS011PercentRelative humidity of the atmosphere by humidity sensor
CSLRRP011Watts per square metreDownwelling vector irradiance as energy of electromagnetic radiation (solar (300-3000nm) wavelengths) in the atmosphere by port-mounted pyranometer
CSLRRS011Watts per square metreDownwelling vector irradiance as energy of electromagnetic radiation (solar (300-3000nm) wavelengths) in the atmosphere by starboard-mounted pyranometer
DWIRRPSD1Watts per square metreDownwelling vector irradiance as energy of electromagnetic radiation (PAR wavelengths) in the atmosphere by port-mounted cosine-collector radiometer
DWIRRSSD1Watts per square metreDownwelling vector irradiance as energy of electromagnetic radiation (PAR wavelengths) in the atmosphere by starboard-mounted cosine-collector radiometer
EWDASS011Degrees TrueDirection (from) of wind relative to True North {wind direction} in the atmosphere by in-situ anemometer
EWSBSS011Metres per secondSpeed of wind {wind speed} in the atmosphere by in-situ anemometer

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

OSMOSIS RRS James Cook JC090 Meteorology Quality Report

Wind sensors

There are areas in this time series when the true wind speed show signs of shielding. Shielding occurs when the sensor is partially blocked from the wind by the ship. This is particularly noticeable during 8:30:00 to 15:50:00 on 14/09/2013.

Light sensors

Both PAR and TIR sensors exhibited negative readings in the dark. This phenomena is known to be caused by radiation loss at night. Night time negative values were flagged suspect to preserve the data value. (BODC assessment)


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

Gill Instruments Windsonic Anemometer

The Gill Windsonic is a 2-axis ultrasonic wind sensor that monitors wind speed and direction using four transducers. The time taken for an ultrasonic pulse to travel from the North to the South transducers is measured and compared with the time for a pulse to travel from South to North. Travel times between the East and West transducers are similarly compared. The wind speed and direction are calculated from the differences in the times of flight along each axis. This calculation is independent of environmental factors such as temperature.

Specifications

Ultrasonic output rate 0.25, 0.5, 1, 2 or 4 Hz
Operating Temperature -35 to 70°C
Operating Humidity < 5 to 100% RH
Anemometer start up time < 5 s
Wind speed
Range 0 to 60 m s-1
Accuracy ± 2% at 2 m s-1
Resolution 0.01 m s-1
Response time 0.25 s
Threshold 0.01 m s-1
Wind direction
Range 0 to 359°
Accuracy ± 3° at 12 m s-1
Resolution
Response time 0.25 s

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

Kipp and Zonen Pyranometer Model CM6B

The CM6B pyranometer is intended for routine global solar radiation measurement research on a level surface. The CM6B features a sixty-four thermocouple junction (series connected) sensing element. The sensing element is coated with a highly stable carbon based non-organic coating, which delivers excellent spectral absorption and long term stability characteristics. The sensing element is housed under two concentric fitting Schott K5 glass domes.

Specifications

Dimensions (W x H) 150.0 mm x 91.5 mm
Weight 850 grams
Operating Temperature -40°C to +80°C
Spectral Range 305 - 2800 nm
(50% points)
Sensitivity 9 -15 µV/W/m2
Impedance (nominal) 70 - 100 ohm
Response Time (95%) 30 sec
Non-linearity < ± 1.2% (<1000 W/m2)
Temperature dependence of sensitivity < ± 2% (-10 to +40°C)
Zero-offset due to temperature changes < ± 4 W/m2 at 5 K/h temperature change

OSMOSIS RRS James Cook JC090 Meteorology Instrumentation

The meteorological suite of sensors were located on the foremast, approximately 20 m above sea level. The anemometer orientation was 0° on the bow.

Manufacturer Model Serial number Last manufacturer's calibration date Comments
Skye SKE 510 38884 13/08/2012 Starboard
Skye SKE 510 28562 22/09/2011 Port
Kipp and Zonen CM 6B 994132 10/07/2012 Port
Kipp and Zonen CM 6B 994133 10/07/2012 Starboard
Gill Windsonic 064537 no calibration -
Vaisala HMP45 B4950010 06/07/2013 Air Temperature and Relative Humidity
Vaisala PTB100 U1420016 21/3/2013 Air Pressure

BODC image

Skye Instruments PAR Energy Sensor Model SKE 510

The SKE 510 is suitable for measuring photosynthetically active radiation (PAR) from natural or artificial light sources. The sensor is fully waterproof and guaranteed submersible to 4m depth, and indoor versions are also available.

The instrument uses a blue-enhanced planar diffused silicon detector to measure energy (in W m-2) over the 400-700 nm waveband. It has a cosine-corrected head and a square spectral response. The sensor can operate over a temperature range of -35 to 70 °C and a humidity range of 0-100% RH.

Specifications

Sensitivity (current) 1.5µA or 100 W m-2
Sensitivity (voltage) 1mV or 100 W m-2
Working Range 0-5000 W m-2
Linearity error 0.2%
Absolute calibration error typ. less than 3%
5% max
Response time - voltage output 10 ns
Cosine error 3%
Azimuth error less than 1%
Temperature co-efficient ±0.1% per °C
Internal resistance - voltage output c. 300 ohms
Longterm stability ±2%
Material Dupont 'Delrin'
Dimensions 34 mm diameter
38mm height
Cable 2 core screened
7 - 2 - 2C
Sensor Passband 400 - 700 nm
Detector Silicon photocell
Filters Glass type and/or metal interference

Vaisala Analog Barometers Models PTB100 (A), (B) and PTB101 (B), (C)

The PTB 100 series analog barometers are designed both for accurate barometric measurements at room temperature and for general environmental pressure monitoring over a wide temperature range. The long-term stability of the barometer minimizes the need for field adjustment in many applications.

Physical Specifications

Size 97 x 60 x 22 mm
Weight 85g

The barometers use the BAROCAP* silicon capacitive absolute pressure sensor developed by Vaisala for barometric pressure measurements. The BAROCAP* sensor combines the elasticity characteristics and mechanical stability of a single-crystal silicon with the proven capacitive detection principle.

Sensor Specifications

Model Number Pressure Range
(mbar)
Temperature Range
(°C)
Humidity Range Total Accuracy
PTB100A 800 to 1060 -40 to +60 non-condensing +20 °C ± 0.3 mbar
0 to +40 °C ± 1.0 mbar
-20 to +45 °C ± 1.5 mbar
-40 to +60 °C ± 2.5 mbar
PTB100B 600 to 1060 -40 to +60 non-condensing +20 °C ± 0.5 mbar
0 to +40 °C ± 1.5 mbar
-20 to +45 °C ± 2.0 mbar
-40 to +60 °C ± 3.0 mbar
PTB101B 600 to 1060 -40 to +60 non-condensing +20 °C ± 0.5 mbar
0 to +40 °C ± 1.5 mbar
-20 to +45 °C ± 2.0 mbar
-40 to +60 °C ± 3.0 mbar
PTB101C 900 to 1100 -40 to +60 non-condensing +20 °C ± 0.3 mbar
0 to +40 °C ± 1.0 mbar
-20 to +45 °C ± 1.5 mbar
-40 to +60 °C ± 2.5 mbar

* BAROCAP is a registered trademark of Vaisala

Vaisala Temperature and Relative Humidity HMP Sensors

A family of sensors and instruments (sensors plus integral displays or loggers) for the measurement of air temperature and relative humidity. All are based on a probe containing a patent (HUMICAP) capacitive thin polymer film capacitanece humidity sensor and a Pt100 platinum resistance thermometer. The probes are available with a wide range of packaging, cabling and interface options all of which have designations of the form HMPnn or HMPnnn such as HMP45 and HMP230. Vaisala sensors are incorporated into weather stations and marketed by Campbell Scientific.

All versions operate at up to 100% humidity. Operating temperature ranges vary between models, allowing users to select the version best suited to their requirements.

Further details can be found in the manufacturer's specification sheets for the HMP 45 series, HMP 70 series and HMP 230 series.

OSMOSIS RRS James Cook JC090 Meteorology processing procedures

Originator's Data Processing

Data was extracted from TECHSAS MET-JC-SM_JC1.SURFMETv2 data stream each day. Time was converted from TECHSAS days to seconds from time origin (1/1/2013 0:0:0). Relative wind speed and direction was converted to true (Earth coordinate) wind speed and direction using processed ship navigation data from the position-Applanix_GPS_JC1.gps TECHSAS stream. U (eastward) and V (northwards) wind velocity components were calculated.

File delivered to BODC
Filename Content description Format Interval Start date/time (UTC) End date/time (UTC) Comments
Light_JC_SM_JC1_SURFMETv2 raw meteorology data Matlab <1 second 01/09/2013 12:37:00 14/09/2013 23:59:00 raw PAR and TIR
MET_JC_SM_JC1_SURFMETv2 raw meteorology data Matlab <1 second 01/09/2013 12:37:00 14/09/2013 23:59:00 Relative wind speed and direction

BODC Data Processing

The MET_JC_SM_JC1_SURFMETv2 data file included true wind speed and direction but these were not transferred. This is because absolute wind speed and direction were derived by BODC from the relative data. The data were reformatted to NetCDF using BODC standard data banking procedures. The following table shows how variables within the file were mapped to appropriate BODC parameter codes:

Light_JC_SM_JC1_SURFMETv2

Originator's variable Originator's units Description BODC Code BODC Units Unit conversion Comments
pressure mbar Pressure (measured variable) exerted by the atmosphere CAPHZZ01 Millibars - -
port_par volt x 105 Instrument output (voltage) by port-mounted PAR cosine-collector radiometer DVLTRPSD volts /10-5 -
starb_par volt x 105 Instrument output (voltage) by starboard-mounted PAR cosine-collector radiometer DVLTRSSD volts /10-5 -
port_tir volt x 105 Instrument output (voltage) by port-mounted pyranometer CVLTRP01 volts /10-5  
starb_tir volt x 105 Instrument output (voltage) by starboard-mounted pyranometer CVLTRS01 volts /10-5 -

MET_JC_SM_JC1_SURFMETv2

Originator's variable Originator's units Description BODC Code BODC Units Unit conversion Comments
rel_wind_spd m/s Wind speed (relative to moving platform) in the atmosphere by in-situ anemometer ERWSSS01 m/s - -
rel_wind_dir degrees Wind direction (relative to moving platform) in the atmosphere by in-situ anemometer ERWDSS01 degrees - 0° on the bow
air_temp degrees C Temperature of the atmosphere by dry bulb thermometer CDTASS01 degrees C - -
humidity % Relative humidity of the atmosphere by humidity sensor CRELSS01 % - -
true_wind_dir degrees Wind from direction in the atmosphere by in-situ anemometer EWDASS01 degrees - derived by BODC from relative.
true_wind_spd m/s Wind speed in the atmosphere by in-situ anemometer EWSBSS01 m/s - derived by BODC from relative.

Screening

All the reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag.

Calibration

Absolute wind speed and direction

Relative wind speed and direction were corrected for the ship's heading and speed using the POS MV gyro heading, ship velocities (calculated at BODC from the main positional channels) and an anemometer orientation of 0° on the bow.

PAR and TIR

The following manufacturer's calibrations were applied to the PAR and TIR light sensors using:

y (W m-2) = (a x 106)/b

where 'a' is the raw data in volts and 'b' is the calibration offset (µV per W m-2) as shown below.

Sensor Serial no location offset
(µV per W m-2)
PAR 28562 port 10.81
PAR 38884 starboard 9.530
TIR 994132 port 11.41
TIR 994133 starboard 9.67

Subsequently, as no offset could be identified, the maximum value of the port-side and starboard-side sensor pairs were calculated into a new data channels.


Project Information

Ocean Surface Mixing, Ocean Sub-mesoscale Interaction Study (OSMOSIS)

Background

The Ocean Surface Mixing, Ocean Sub-mesoscale Interaction Study (OSMOSIS) consortium was funded to deliver NERC's Ocean Surface Boundary Layer (OSBL) programme. Commencing in 2011, this multiple year study will combine traditional observational techniques, such as moorings and CTDs, with the latest autonomous sampling technologies (including ocean gliders), capable of delivering near real-time scientific measurements through the water column.

The OSMOSIS consortium aims to improve understanding of the OSBL, the interface between the atmosphere and the deeper ocean. This layer of the water column is thought to play a pivotal role in global climate and the productivity of our oceans.

OSMOSIS involves collaborations between scientists at various universities (Reading, Oxford, Bangor, Southampton and East Anglia) together with researchers at the National Oceanography Centre (NOC), Scottish Association for Marine Science (SAMS) and Plymouth Marine Laboratory (PML). In addition, there are a number of project partners linked to the consortium.

Scientific Objectives

  • The primary goal of the fieldwork component of OSMOSIS is to obtain a year-long time series of the properties of the OSBL and its controlling 3D physical processes. This is achieved with an array of moorings (two nested clusters of 4 moorings, each centred around a central mooring) and gliders deployed near the Porcupine Abyssal Plain (PAP) observatory. Data obtained from this campaign will help with the understanding of these processes and subsequent development of associated parameterisations.
  • OSMOSIS will attempt to create parameterisations for the processes which determine the evolving stratification and potential vorticity budgets of the OSBL.
  • The overall legacy of OSMOSIS will be to develop new (physically based and observationally supported) parameterisations of processes that deepen and shoal the OSBL, and to implement and evaluate these parameterisations in a state-of-the-art global coupled climate model, facilitating improved weather and climate predictions.

Fieldwork

Three cruises are directly associated with the OSMOSIS consortium. Preliminary exploratory work in the Clyde Sea (September 2011) to hone techniques and strategies, followed by a mooring deployment and recovery cruise in the vicinity of the Porcupine Abyssal Plain (PAP) observatory (in late Summer 2012 and 2013 respectively). Additional opportunist ship time being factored in to support the ambitious glider operations associated with OSMOSIS.

Instrumentation

Types of instrumentation and measurements associated with the OSMOSIS observational campaign:

  • Ocean gliders
  • Wave rider buoys
  • Towed SeaSoar surveys
  • Microshear measurements
  • Moored current meters, conductivity-temperature sensors and ADCPs
  • Traditional shipboard measurements (including CTD, underway, discrete nutrients, LADCP, ADCP).

Contacts

Collaborator Organisation
Prof. Stephen Belcher University of Reading, U.K
Dr. Alberto C Naveira Garabato University of Southampton, U.K

Data Activity or Cruise Information

Cruise

Cruise Name JC090
Departure Date 2013-08-31
Arrival Date 2013-09-16
Principal Scientist(s)Alberto C Naveira Garabato (University of Southampton School of Ocean and Earth Science)
Ship RRS James Cook

Complete Cruise Metadata Report is available here


Fixed Station Information


No Fixed Station Information held for the Series


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