Metadata Report for BODC Series Reference Number 1762236


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 Mr Martin Bridger
Originating Organization National Marine Facilities Sea Systems
Processing Status banked
Project(s) Oceans 2025 Theme 10 SO1:AMT
 

Data Identifiers

Originator's Identifier D371_PRODQXF_MET
BODC Series Reference 1762236
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2011-09-29 08:19
End Time (yyyy-mm-dd hh:mm) 2011-11-11 17:59
Nominal Cycle Interval 60.0 seconds
 

Spatial Co-ordinates

Southernmost Latitude 52.05483 S ( 52° 3.3' S )
Northernmost Latitude 51.50700 N ( 51° 30.4' N )
Westernmost Longitude 67.10200 W ( 67° 6.1' W )
Easternmost Longitude 2.70400 W ( 2° 42.2' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth -19.9 m
Maximum Sensor Depth -17.6 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
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
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 Discovery Cruise D371 AMT21 Meteorology Data Quality Document

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.

Wind channels

The relative wind speed and direction channels show natural variation and fluctuation but there were no values or trends that stood out as unrealistic. There were 'steps' in the channel but this is related to the vessel coming on to or leaving station. No additional flags were added. The absolute wind speed and direction channels were screened and a few spikes flagged suspect.

Irradiance channels

The data in the 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 Discovery Cruise D371 AMT21 Meteorology Instrument Description Document

Sensor Serial number Last calibration date Deployment
Gill Wind sonic (Option 3) 071123 - Port
Skye Instruments SKE510 28559 2010-07-22 Starboard
Skye Instruments SKE510 28563 2011-09-02 Port
Kipp and Zonen Ltd CMB6 962276 2010-09-17 Starboard
Kipp and Zonen Ltd CMB6 962301 2011-05-12 Port
Vaisala PTB100A S3440012 2011-03-21 Port
Vaisala HMP45A B4950011 2011-04-10 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 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 .

AMT RRS Discovery Cruise D371 AMT21 Meteorology Processing Procedures Document

Originator's Data Processing

During the cruise there was a dual logging system in place on the RRS Discovery. Data from the various instruments were logged to the RVS Level-C system files surfmetX and surfmet, and also as NetCDF (binary) through the Ifremer Techsas data logging system. 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

Processing was carried out using the RVS software suite only on the wind channels. The RVS processing routine PRO_WIND was run on the navigation data in the bestnav and the relative wind data in the surfmet files. This program was designed to remove the relative variables from the wind data logged by surfmet. By removing any fixed offsets in the system and removing the affect of ship motion the data in the pro_wind file is a true representation of wind data at the ship's position.

Filename Data type Start Calendar Day Start Time Finish Calendar Day Finish Time Interval
pro_wind RVS Level-C processed 2011-09-28 08:07:00 2011-11-12 14:01:50 10 seconds
surfmetX RVS Level-C raw 2011-09-28 08:06:49 2011-10-02 09:00:00 1 sec
surfmet RVS Level-C raw 2011-10-01 09:34:08 2011-11-11 18:03:53 1 sec

BODC Data Processing

The last ~20 days TECHSAS files (except for the TSG data) were not saved to the post-cruise archive. TECHSAS files from 23 Oct 2011 to 13 Nov 2011 were missing. The RVS level-C files were confirmed complete by the originator. Since the TECHSAS file record for the cruise was incomplete the RVS Level-C files were chosen for transfer to the BODC underway file.

The surfmetX/surfmet and seabirdX/seabird data were transferred. A description of the channels present in the files, units, whether they were transferred, BODC parameter code and units, and if a unit conversion was applied during the transfer are detailed in the table below:

surfmet Channels Description Units BODC Parameter Code Units Conversion Factor
press Atmospheric pressure at measurement height - no sea level correction 1 hPa CAPHTU01 1 mbar *1
ppar Raw port PAR sensor voltage 10 -2 mV DVLTRPSD V *10 -5
spar Raw starboard PAR sensor voltage 10 -2 mV DVLTRSSD V *10 -5
speed Relative wind speed m s -1 ERWSSS01 m s -1 *1
direct Relative wind direction Degrees ERWDSS01 Degrees *1
airtemp Air temperature Degrees Celsius CDTASS01 Degrees Celsius *1
humid Air humidity Percent CRELSS01 Percent *1
ptir Raw port TIR sensor voltage 10 -2 mV CVLTRP01 V *10 -5
stir Raw starboard TIR sensor voltage 10 -2 mV CVLTRS01 V *10 -5

Wind channels - calculation of absolute values

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).

Calibrations

Irradiance channels (PAR and TIR) - conversion from voltages using manufacturer's calibrations

The manufacturer's calibrations from the sheets supplied by NMF-SS have been applied through the BODC Calibration database.

BODC ICALRF 6720 DWIRRSSD = DVLTRSSD * 89206.07 from calibration coefficient 11.21 µV / W m -2

BODC ICALRF 6721 DWIRRPSD = DVLTRPSD * 91407.68 from calibration coefficient 10.94 µV / W m -2

BODC ICALRF 6722 CSLRRS01 = CVLTRS01 * 97276.26 from calibration coefficient 10.28 µV / W m -2

BODC ICALRF 6737 CSLRRP01 = CVLTRP01 * 101626.02 from calibration coefficient 9.84 µV / W m -2


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 D371 (AMT21)
Departure Date 2011-09-29
Arrival Date 2011-11-13
Principal Scientist(s)Glen A Tarran (Plymouth Marine Laboratory)
Ship RRS Discovery

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