Metadata Report for BODC Series Reference Number 1760647


Metadata Summary

Data Description

Data Category Meteorology -unspecified
Instrument Type
NameCategories
Vaisala HMP temperature and humidity sensor  meteorological packages
Gill Windsonic anemometer  anemometers
Vaisala PTB 210 digital barometer  meteorological packages
Kipp and Zonen CM6B pyranometer  radiometers
Skye Instruments SKE510 PAR energy sensor  radiometers
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Andy Rees
Originating Organization Plymouth Marine Laboratory
Processing Status banked
Project(s) Oceans 2025 Theme 10 SO1:AMT
 

Data Identifiers

Originator's Identifier JC039_PRODQXF_MET
BODC Series Reference 1760647
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2009-10-13 12:12
End Time (yyyy-mm-dd hh:mm) 2009-11-30 11:06
Nominal Cycle Interval 60.0 seconds
 

Spatial Co-ordinates

Southernmost Latitude 51.59017 S ( 51° 35.4' S )
Northernmost Latitude 50.15783 N ( 50° 9.5' N )
Westernmost Longitude 65.70050 W ( 65° 42.0' W )
Easternmost Longitude 4.99800 W ( 4° 59.9' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth -19.4 m
Maximum Sensor Depth -17.1 m
Minimum Sensor Height -
Maximum Sensor Height -
Sea Floor Depth -
Sensor 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 Depth Datum Approximate - Depth is only approximate
Sea Floor Depth Datum -
 

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)
ALATGP01 1 Degrees Lat_GPS Latitude north (WGS84) by unspecified GPS system
ALONGP01 1 Degrees Lon_GPS Longitude east (WGS84) by unspecified GPS system
CAPHTU01 1 Millibars Air_press Pressure (measured variable) exerted by the atmosphere by barometer and expressed at measurement altitude
CDTAZZ01 1 Degrees Celsius AirTemp Temperature of the atmosphere by thermometer
CRELZZ01 1 Percent Air_humid Relative humidity of the atmosphere
CSLRRP01 1 Watts per square metre Port_solar Downwelling vector irradiance as energy (solar (300-3000nm) wavelengths) in the atmosphere by port-mounted pyranometer
CSLRRS01 1 Watts per square metre Stbd_solar Downwelling vector irradiance as energy (solar (300-3000nm) wavelengths) in the atmosphere by starboard-mounted pyranometer
DWIRRPSD 1 Watts per square metre Port_SurfVPAR Downwelling vector irradiance as energy (PAR wavelengths) in the atmosphere by port-mounted cosine-collector radiometer
DWIRRSSD 1 Watts per square metre Stbd_SurfVPAR Downwelling vector irradiance as energy (PAR wavelengths) in the atmosphere by starboard-mounted cosine-collector radiometer
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
 

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

AMT RRS James Cook Cruise JC039 meteorology quality control report

The meteorology data have been through BODC quality control screening. Some intermittent flagging of data have been made. Overall the data for the cruise duration appear good. Additional notes are provided from the NMF technicians' report where anomalies in the data were apparent due to problems with the sensors during the cruise.

Irradiance channels

Good agreement between the two total PAR sensors. For the two total solar irradiance sensors, one of them (starboard) reads slightly higher (about 70 - 80 W m-2) at noon than the other.

The data in the TIR and PAR channels did not require further flagging as it is unclear whether the variation is due to changing cloud cover etc.


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

AMT RRS James Cook Cruise JC039 meteorology instrumentation

Manufacturer Model Serial number Last calibration date Deployment
Gill Windsonic (Option 3) 064537 Port
Skye Instruments SKE510 28562 2009-04-29 Starboard
Skye Instruments SKE510 28561 2009-04-29 Port
Kipp and Zonen Ltd CM6B 973135 2009-04-20 Starboard
Kipp and Zonen Ltd CM6B 973134 2009-04-20 Port
Vaisala PTB210 U1420016 2009-04-01 Port
Vaisala HMP45A E1055002 2009-03-15 Port

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/m 2
Impedance (nominal) 70 - 100 ohm
Response Time (95%) 30 sec
Non-linearity < ± 1.2% (<1000 W/m 2 )
Temperature dependence of sensitivity < ± 2% (-10 to +40°C)
Zero-offset due to temperature changes < ± 4 W/m 2 at 5 K/h temperature change

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 PTB210 Digital Barometer

The basic specifications for this pressure sensor are as follows:

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

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 .

AMT RRS James Cook Cruise JC039 meteorogical data processing procedures

Originator's Data Processing

The meteorology component consisted of a suite of sensors mounted on the foremast at a height of approximately 17 m above the waterline. Parameters measured were wind speed and direction, air temperature, humidity and atmospheric pressure. There were also a pair of optical sensors mounted on gimbals on each side of the ship. These measured total irradiance (TIR) and photo-synthetically active radiation (PAR).

The data from the meteorological sensors were logged by the TECHSAS system during the cruise and combined in the RVS Level-C format to produce the file 'surfmet'. The following instruments were logged during the cruise:
1) Gill Wind sonic (Option 3)
2) Skye Instruments SKE510 (port and starboard)
3) Kipp and Zonen Ltd CMB6 (port and starboard)
4) Vaisala PTB100A
5) Vaisala HMP45A

No processing was carried out using the RVS software suite on meteorology channels.

The table below shows the files delivered to BODC.

Filename Content Description Format Start Calendar Day Start Time Finish Calendar Day Finish Time Interval
surfmet Relative wind speed, relative wind direction, air temperature, humidity, atmospheric pressure, PAR and TIR RVS Level-C raw 2009-10-13 14:26:00 2009-11-29 16:27:00 60 seconds

BODC Data Processing

Reformatting

Meteorological data from the raw RVS files were transferred to BODC's NetCDF format (QXF) under the BODC Underway Data System (BUDS). This transfer involved reducing the data by averaging to 60 second intervals. Directional data were reduced by averaging using a unit circle.

The 'surfmet' file was used as the source data for transfer.

The following table shows how the variables within the files were mapped to appropriate BODC parameter codes.

surfmet

Originator's Variables Originator's Units Description BODC Parameter Code BODC Units Conversion Factor Comments
press 1 hPa Atmospheric pressure at measurement height - no sea level correction CAPHTU01 1 mbar *1  
ppar 10 -2 mV Raw port PAR sensor voltage DVLTRPSD V *10 -5 Channel converted to PAR irradiance by BODC
spar 10 -2 mV Raw starboard PAR sensor voltage DVLTRSSD V *10 -5 Channel converted to PAR irradiance by BODC
speed m s -1 Relative wind speed ERWSSS01 ms -1 *1 Channel converted to true wind speed by BODC
direct Degrees Relative wind direction ERWD2201 Degrees *1 Channel converted to true wind direction by BODC
airtemp Degrees Celsius Air temperature CDTAZZ01 Degrees Celsius *1  
humid Percent Air humidity CRELZZ01 Percent *1  
ptir 10 -2 mV Raw port TIR sensor voltage CVLTRP01 V *10 -5 Channel converted to TIR by BODC
stir 10 -2 mV Raw starboard TIR sensor voltage CVLTRS01 V *10 -5 Channel converted to TIR by BODC

* NMF technician confirmed the fluorometer and transmissometer channels had been reversed during logging.

Wind channels

The BODC Matlab procedure 'wincor' was run using relative wind speed and direction, the ship's north-south and east-west velocities with the vane set to 0 degrees at the bow to generate absolute wind speed (EWSASS01) and direction (EWDASS01).

Screening

Each data channel was inspected on a graphics workstation using BODC screening software EDSERPLO and any spikes or periods of dubious data were flagged using BODC quality control flag system. Impossible values were checked carefully and flagged null only if believed to be genuine missing or bad data. EDSERPLO was used to carry out comparative screening checks between channels by overlaying data channels. A map of the cruise track was simultaneously displayed in order to take account of the oceanographic context.

Calibrations

Field Calibrations

No field calibrations were applied to the data at BODC.

Manufacturer's Calibrations

Irradiance channels

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

y (W m -2 ) = (a x 10 6 )/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 28561 Port 10.17
PAR 28562 Starboard 10.86
TIR 973135 Starboard 11.84
TIR 973134 Port 10.96

Project Information

Oceans 2025 Theme 10, Sustained Observation Activity 1: The Atlantic Meridional Transect (AMT)

The Atlantic Meridional Transect has been operational since 1995 and through the Oceans 2025 programme secures funding for a further five cruises during the period 2007-2012. The AMT programme began in 1995 utilising the passage of the RRS James Clark Ross between the UK and the Falkland Islands southwards in September and northwards in April each year. Prior to Oceans 2025 the AMT programme has completed 18 cruises following this transect in the Atlantic Ocean. This sustained observing system aims to provide basin-scale understanding of the distribution of planktonic communities, their nutrient turnover and biogenic export in the context of hydrographic and biogeochemical provinces of the North and South Atlantic Oceans.

The Atlantic Meridional Transect Programme is an open ocean in situ observing system that will:

The specific objectives are:

The measurements taken and experiments carried out on the AMT cruises will be closely linked to Themes 2 and 5. The planned cruise track also allows for the AMT data to be used in providing spatial context to the Sustained Observation Activities at the Porcupine Abyssal Plain Ocean Observatory (SO2) and the Western Channel Observatory (SO10).

More detailed information on this Work Package is available at pages 6 - 9 of the official Oceans 2025 Theme 10 document: Oceans 2025 Theme 10

Weblink: http://www.oceans2025.org/


Data Activity or Cruise Information

Cruise

Cruise Name JC039 (AMT19, JC040)
Departure Date 2009-10-13
Arrival Date 2009-12-01
Principal Scientist(s)Andrew Rees (Plymouth Marine Laboratory)
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