Metadata Report for BODC Series Reference Number 2223819

• 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 Monitoring and Survey RRS James Clark Ross JR15004 meteorology quality control report

Several gaps in the data were identified for the air pressure, temperature, humidity, and photosynthetically active radiation (PAR) sensors, covering the following parameters: CAPHTU01, CAPHTU02, CDTASS01, CDTASS02, CRELZZ01, CRELZZ02, IRRDSV01, PARERXSD. These gaps were automatically flagged 'N' for the time periods affected.

Sensor pairs exhibited good agreement throughout the cruise, with the exception of air temperature, where the second sensor tended to record slightly lower values than the primary sensor, which can be seen in the data (CDTASS02 as compared to CDTASS01).

Humidity sensors registered a few periods with fairly constant data, however this was not considered anomalous and so no flags were applied (CRELZZ01 and CRELZZ02).

No data were provided for the paired total irradiance sensors (CSLRR101 and CSLRR102). These were indicated as not working in the AME electronics report provided by British Antarctic Survey (BAS).

For the PAR sensor channels (IRRDSV01 and PARERXSD), night periods were flagged.

No flags were required for relative wind speed or direction.

Data Access Policy

Open 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.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."

Narrative Documents

BAS Long Term Monitoring and Survey RRS James Clark Ross JR15004 Underway Cruise Document

Cruise details

JR15004 consisted of a series of science modules operating at different spatial scales in the South Orkney Island region of the Scotia Sea. The main objectives for the cruise were:

• to characterise physical and biological environment on a latitudinal transect upstream of the South Orkney region
• to characterise the physical and biological environment of the northern shelf and shelf break region of the South Orkney Islands.
• to determine the fine scale distribution of krill across the most heavily fished area of the north coast of the South Orkney Islands
• to understand physical-biological drivers at the small scale of the Western Canyon
• to map distribution and biomass of krill and predators in large krill aggregation detected on shelf break of Coronation Island
• to understand physical-biological drivers of behaviour in krill aggregations
• to calibrate EK60 and EK80 systems on JCR. WBAT stand-alone system for moorings and CTD. RDI ship-mounted ADCP

The research activities link with concurrent observations from commercial fishing vessels operating in the region, together with a regional 5 day krill survey undertaken by Norwegian fishing vessel FV Saga Sea. The ship-based activities are also tightly linked to predator tracking studies being undertaken from key penguin and fur seal colonies in the South Orkney region.

Upon leaving port, the ship sailed towards Scotia Bay, then the northern shelf of Coronation Island, the Inaccessible Canyon, Signy and from there transited back to Mare Harbour, Falklands.

Data were not processed by the originator.

BAS Long Term Monitoring and Survey RRS James Clark Ross JR15004 Underway Meteorology Instrumentation

Meteorological measurements were performed by several sensors located at the meteorological mast. All instruments were located at a height of 20 m except the anemometer which was located 22.5 m above the water. The TIR sensors were not logging during the cruise.

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.

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.

BAS Long Term Monitoring and Survey RRS James Clark Ross JR15004 Underway Meteorology Document

Content of data series

Data Processing Procedures

Originator's Data Processing

Data processing was not performed by the originator.

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 duplicate sensors were placed side by side, 20 m above sea level.

BODC Data Processing

The files mentioned above were selected for data banking as they contain the best version of meteorological parameters. Data were banked at BODC following standard data banking procedures, including reduction through averaging, checking meteorological channels for improbable values, working out absolute wind speed and direction, and screening the data for anomalous values. The originator's variables were mapped to appropriate BODC parameter codes as follows:

anemomometer

All data expressed at measurement altitude. BODC's procedures included the transfer of originator's parameters into BODC codes and visual screening in Edserplo. N flags were applied during the transfer to absent values

The meteorological data were collected with two sets of instruments. Data from both sensors, primary and secondary, were transferred and visually checked.

All data from secondary channels is available upon request.

Absolute wind speed and direction

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

No flags were assigned during visual screening.

Light sensors

Slightly negative data were identified in PAR data during night periods. These instances have been flagged N although they might be an artefact of the sensor's own radiation at night. TIR channels were loaded and after inspection it was found that the sensors hadn't been logging during the cruise, therefore the channels are not included in the final file.

Air Pressure, Air Temperature and Relative Humidity

Duplicate channels for each sensor were screened and they exhibit a similar quality.

Project Information

BAS Long Term Monitoring and Survey

Introduction

The Long Term Monitoring and Survey project (LTMS) has been running since the British Antarctic Survey (BAS) was created. This project is one of the BAS core projects, with several groups of scientists collecting various types of data e.g biological, geological, atmospheric, among others.

Data collection is achievable through a wide scope of instruments and platforms, e.g. the Antarctic research stations, autonomous instrument platforms deployed on or from BAS research ships, BAS aircrafts, satellite remote sensing and others.

Scientific Objectives

This project was implemented in order to measure change and variability in the Earth system. Its long term duration allows for the monitoring of processes that could be missed in shorter term studies and experiments. The data collected is also used to check and improve the reliability of models used to stimulate and predict the behavior of the Earth system.

The main objectives are:

• Topographic survey
• Geosciences survey
• Biological survey and monitoring
• Atmospheric and oceanographic monitoring

Data Availability

The data sets obtained through this project are available to the academic community.

Data Activity or Cruise Information

Cruise

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:

SeaDataNet Quality Control Flags

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