Metadata Report for BODC Series Reference Number 1918993

• 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_PSPE RRS James Clark Ross Cruise JR20110128 (JR244) Underway Meteorology Quality Control Document

Air Temperature, Humidity and Pressure

The primary air temperture channel did not record any data throughout the cruise. The primary relative humidity recorded data for a brief period, however this data is constant. These channels are not included in the final file.

Several periods of fairly constant data in CRELZZ02 were identified. The data were not considered improbable and therefore not flagged. The affected periods are:

• 30/01/2011 04:52:00 hours to 01/02/2011 12:48:00 hours
• 01/02/2011 17:45:00 hours to 01/02/2011 21:11:00 hours
• 02/02/2011 06:47:00 hours to 02/02/2011 08:24:00 hours
• 02/02/2011 16:13:00 hours to 02/02/2011 18:13:00 hours
• 02/02/2011 22:18:00 hours to 04/02/2011 19:19:00 hours
• 04/02/2011 23:39:00 hours to 05/02/2011 00:03:00 hours
• 07/02/2011 10:36:00 hours to 07/02/2011 17:09:00 hours
• 07/02/2011 17:53:00 hours to 07/02/2011 19:39:00 hours
• 07/02/2011 23:56:00 hours to 08/02/2011 14:37:00 hours
• 08/02/2011 15:25:00 hours to 08/02/2011 16:19:00 hours
• 08/02/2011 18:58:00 hours to 09/02/2011 02:55:00 hours
• 09/02/2011 05:54:00 hours to 09/02/2011 06:45:00 hours
• 09/02/2011 20:05:00 hours to 10/02/2011 07:03:00 hours
• 10/02/2011 18:26:00 hours to 10/02/2011 18:58:00 hours
• 12/02/2011 00:36:00 hours to 12/02/2011 13:05:00 hours
• 13/02/2011 03:02:00 hours to 13/02/2011 09:12:00 hours
• 18/02/2011 10:35:00 hours to 18/02/2011 12:06:00 hours
• 05/03/2011 23:05:00 hours to 06/03/2011 00:01:00 hours
• 06/03/2011 03:55:00 hours to 06/03/2011 05:14:00 hours
• 09/03/2011 20:52:00 hours to 10/03/2011 11:47:00 hours
• 16/03/2011 01:17:00 hours to 16/03/2011 08:27:00 hours

Light sensors

Both PAR and TIR sensors were set to absent during the night period by the originator.

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.

Furuno GPS/WAAS Navigator GP32

The GP32 is an advanced GPS navigator with a Wide Area Augmentation System (WAAS) receiver which can receive up to 12 discrete GPS channels, all-in-view, and also has DGPS capabilities.

The WAAS applies correction data by means of geostationary satellites. The reference stations on earth monitor the GPS constellation and route GPS error data to the WAAS satellite via the master earth station.

This equipment is comprised of a compact unit designed for coastal activities with several display modes, e.g. Plotter, Nav Data, Steering, Highway, Speedometer and two other costumisable modes. The data can be viewed in WGS-84 or other geodetic systems.

Specifications

The equipment's specification sheet can be accessed Furuno GP32

BAS_PSPE RRS James Clark Ross Cruise JR20110128 (JR244) Underway Meteorology Instrumentation Document

The meteorology instruments used to collect this data set are presented in the table below. The sensors were located on the ship's meteorological mast at approximately 20 m high and the anemometer at 22.5 m high. The data was obtained from duplicate sensors for each parameter but only of the streams is present in the final file.

BAS_PSPE RRS James Clark Ross Cruise JR20110128 (JR244) Underway Meteorology Processing Procedures Document

Originator's Data Processing

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 the following variables: relative wind speed and direction, air temperature, air pressure, relative humidity, PAR and TIR.

All parameters were processed at the British Antarctic Survey Polar Data Centre using R scripts developed by Gwen Buys. The procedures consisted in loading, finding a commmon sampling interval and flagging suspect and/or absent values. The 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

All meteorological parameters were matched to BODC codes and transferred to internal BODC format using established procedures. No unit conversions were necessary as the originator's units are equivalent to the ones defined in the BODC vocabulary dictionary.

BODC processing procedures included loading of data and reduction through averaging, visual screening and flagging of anomalous values. All data expressed at measurement altitude.

The originator's variables were mapped to appropriate BODC parameter codes as follows:

jr244_ocl _exactsec

anem

Screening

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

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.

PAR and TIR

Night periods were set to absent by the originator. Both set of sensors exhibit a similar quality between them.

Air Pressure

Both channels were screened and they exhibit a similar quality. N flags were applied to null data.

Air Temperature and Relative Humidity

All channels were screened and it was clear that the primary sensors did not log valid data during the cruise, The primary air temperature did not record any data and the primary relative humidity recorded a small period of data, however it is constant whereas the majority of the cruise period is null. This channel is not included in the final file but is available upon request. The final file contains data for CRELZZ02 and CDTAZZ02 only.

Several periods of fairly constant relative humidity were identified but as they were not considered improbable, no flags were applied.

Project Information

Polar Science for Planet Earth (PSPE)

Introduction

The PSPE programme is the British Antarctic Survey strategic science framework that extends from April 2009 to March 2013. This programme was created to respond to the Natural Environment Research Council (NERC) strategy from 2007 to 2012, and contributes to a major environmental research programme, Living with Environmental Change (LWEC), which comprises a 10 year partnership between the UK's main organisations that fund, carry out and use environmental research and observations and will improve the country's tools and knowledge to build resilience, mitigate problems and adapt to environmental change.

The PSPE programme will focus on key questions that can be answered by research requiring access to the polar regions, developing research and long term monitoring and survey programmes in the Antarctic but also pursuing new bi-polar and Arctic research opportunities. The support given to the research programmes includes: investment in training, development of scientific skills and expertise, maintenance of the existing research infrastructures (research stations, ships, aircraft and laboratories), development of new techniques to collect, transfer, curate and visualize data from and relating to the polar regions.

PSPE consists of 6 programmes:

• Climate: atmospheric science and processes, including climate modelling
• Chemistry and past climate: quaternary climate including ice cores, lake, sediments, marine sediments and tropospheric chemistry
• Ecosystems: dynamics of polar ecosystems in response to the impacts of climate and fisheries
• Environmental Change and Evolution: the Earth system; geological to upper atmosphere, complexities and scales of interactions, controls on biological evolution
• Ice sheets: ice sheet evolution and flow, ice sheet changes and sea level rise
• Oceans: role of the polar oceans in controlling and influencing the Earth system

Data Availability

The data produced during 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: