Metadata Report for BODC Series Reference Number 1903724

• 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

Problem Reports

No Problem Report Found in the Database

BAS Long Term and Monitoring Survey RRS James Clark Ross Cruise JR20081224 (JR188) Underway Meteorology Data Quality Report

PAR and TIR

N flags were applied to absent values. M flags were applied to cycles above the maximum value (>2500).

One period of fairly constant data were identified in CRELZZ01 from 26/12/2008 20:47:00 hours to 27/12/2008 21:42:00 hours. No flags were applied as the data were not considered anomalous.

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 Windobserver 70 (ultrasonic) anemometer

A solid state, heated ultrasonic anemometer. Designed for use within the aviation industry and for more extreme weather conditions. It measures the times taken for an ultrasonic pulse of sound to travel from the North transducer to the South transducer, and compares it with the time for a pulse to travel from S to N transducer. Likewise times are compared between West and East, and E and W transducer. The wind speed and direction (and the speed of sound) can then be calculated from the differences in the times of flight on each axis. This calculation is independent of factors such as temperature. It uses 150 Watts of electrical heating in the anemometer head to prevent icing. Wind speed accuracy is +/-2% at 12 m/s. Wind direction accuracy is +/-2 degrees at 12 m/s.

For more information, please see this document: https://www.bodc.ac.uk/data/documents/nodb/pdf/Gill_WindObserver70_2017.pdf

Kipp and Zonen PAR Lite Photosynthetically Active Radiation sensor

An atmospheric radiometer that measures photosynthetically active radiation (PAR) by means of a Teflon diffuser, an optical interference filter and a photo-diode detector. The sensor measures the PAR received over the entire hemisphere and the diffuser's sensitivity is proportional to the cosine of the angle of incidence of the incoming radiation. The optical filter has a spectral response of 400-700 nm (PAR wavelengths) and the photodiode creates a voltage output that is proportional to the incoming radiation.

Specifications

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

Kipp and Zonen SP Lite and SP Lite2 Silicon Pyranometer

An atmospheric pyranometer that measures solar radiation over the range 400-1100 nm by means of a silicon photo-diode detector mounted in a diffuser. The sensor measures the radiation received over the entire hemisphere and the diffuser's sensitivity is proportional to the cosine of the angle of incidence of the incoming radiation. The photodiode creates a voltage output that is proportional to the incoming radiation. The SP Lite2 supersedes the SP Lite and features an improved sensitivity and faster response time than its predecessor.

Specifications

Further details can be found in the manufacturer's specification sheets for the SP Lite and SP Lite2.

Rotronic Hygromet MP102H and MP402H temperature and humidity probes

This meteorological probe measures humidity and temperature with the plug-in HygroClip HC2-S3 sensor module, and can also be equipped with a signal conditioned Pt100 temperature probe.

The two models differ in that the MP102H produces a voltage output while the MP402H produces a current output. Other characteristics are common to both models.

The specification sheet can be accessed here Rotronic MP102H and MP402H.

Specifications

Vaisala PTB210 Digital Barometer

The basic specifications for this pressure sensor are as follows:

• Manufacturer: Vaisala
• Type: Silicon capacitive sensor
• Model: PTB210
• Range: 900 - 1100 hPa
• Output: 0-5VDC
• Total Accuracy (20°C): ±0.30hPa
• Operating temperature: -40 to +60 deg C
• Weight: 110g
• Certification Ingress Protection: IP65

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

Kongsberg Seatex Seapath 200 GPS and Gyrocompass

The Seapath 200 is a highly accurate, real-time heading, attitude and position information system that integrates the best signal characteristics of Inertial Measurement Units (IMU) and Global Positioning System (GPS), using a differential GPS method to acquire this data.

The high-rate motion data is obtained from the Seatex MRU5 inertial sensor and two fixed baseline GPS carrier-phase receivers. The raw data is integrated in a Kalman filter in the Seapath Processing Unit. The IMU contains an accurate linear accelerometer and Bosch Coriolis force angular rate gyros (CFG).

This system is equipped to utilise up to six different DGPS reference stations, it checks for consistency within measurements from the different sensors to ensure reliability and rejects noisy data or reports its inaccuracy. The data is available through various output protocols, RS-232, RS-422 and Ethernet.

This instrument is no longer in production; the main characteristics are presented below, and the specification sheet can be accessed here Kongsberg Seatex Seapath 200 .

Specifications

BAS Long Term and Monitoring Survey RRS James Clark Ross Cruise JR20081224 (JR188) Underway Meteorology Instrumentation Document

The meteorological suite of sensors were located on the ship's meteorological mast, with all instruments located 20m above sea level, except the anemometer, which is at 22.5m above sea level and has an orientation of 0° on the bow.

BAS Long Term and Monitoring Survey RRS James Clark Ross Cruise JR20081224 (JR188) Underway Meteorology Processing Procedures Document

Originator's Data Processing

The ship sailed on the 24th December 2008 from Rothera and docked at Signy on the 28th December 2008, this appears to be a transit period but has been included in the data as the ship was recording during this time. On the 29th December 2008, the ship left Signy and began data collection. The cruise ended when the ship docked at South Georgia on the 6th January 2009.

Data were not processed during the cruise, the procedures implemented at that time consisted of data retrieval from the previous 24h and logging those into sub directories on the ship's intranet system.

All instruments, except the anemometer, which was on a mast 22.5 m above sea level, were located on the ship's meteorological mast, the sensors were placed side by side, 20 m above sea level.

Meteorological data originated from duplicate sensors located on the RRS James Clark Ross meteorological mast. The data were sent in two files and included data from: relative wind speed and direction, air temperature, pressure and relative humidity, PAR and TIR.

The post-cruise processing procedures carried out by the originator include:

• check for duplicate dates and times
• standardising time
• check for gaps in data
• check data against defined thresholds
• flagging
• unit conversion

File delivered to BODC

BODC Data Processing

Parameter codes defined in BODC's parameter dictionary were assigned to originator's variables. Unit conversions were not necessary as the originator's units were equivalent to the ones on the BODC dictionary. Data were loaded into BODC's database using established data banking procedures.

jr188_ocl_exactsec

jr188_anem_exactsec

All data expressed at measurement altitude.

All the reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag, missing data by both setting the data to an appropriate value and setting the quality control flag.

Absolute wind speed and direction

EWSBSS01 and EWDASS01 were derived with WINCOR, using ERWSSS01, ERWDSS01, APNSGP01, APEWGP01, HEADCM01 and the anemometer orientation, which is 0°.

PAR and TIR

The light channels were screened and N flags applied to absent values obtained throughout the cruise.

Air Pressure

N flags were applied to absent data identified during the cruise period.

Air Temperature and Relative Humidity

During screening it was clear that the secondary air temperature and relative humidity channels weren't logging data. These channels will not be included in the final file.

Project Information

No Project Information held for the Series

Data Activity or Cruise Information

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Western Core Box

The British Antarctic Survey undertakes cruises to determine krill biomass as part of the ongoing assessment of the status of the marine ecosystem in the region of South Georgia. This unique time series, known as the Western Core Box, which has taken place since 1996 is funded by Natural Environment Research Council (NERC) British Antarctic Survey Long Term Monitoring programme.

The survey area is located in an on and off shelf survery area (figure.1), which comprises of an acoustic grid survey of 8 transects each of 80 km in length. Standard data collection includes underway biological echosounder acoustic transaects, CTD profiles, stratified and targetted RMT8 hauls of macrozooplankton and micronekton and a set of moorings which provide temporal coverage and a year round set of observations.

The specific aims of the WCB are:

• To quantify the interannual variability and long-term change in the mesoscale distribution and abundance of Antarctic krill.
• To quantify the the interannual variability and long-term change in the mesoscale distribution and abundance of other plankton/micronekton.
• To examine interannual varaibility in the context of environmental variability (climate variability).
• To examine prey availiability in the context of predator and fishery demand.

Figure 1. Western Core Box Survey Area (BAS, 2017).

A list of Western Core Box cruises are shown below.

References

British Antarctic Survey (2017). POETS-WCB. Available at: https://www.bas.ac.uk/project/poets-wcb/ [Accessed 2017].

Related Fixed Station activities are detailed in Appendix 1

BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Appendix 1: Western Core Box

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.