Metadata Report for BODC Series Reference Number 1816125

• 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

All temperature (TEMPET01) and sound velocity (SVELCV01) data for series 1815656,1816057,1816070 and 1816082 should not be used as the XBT was recorded as a failed deployement by the Originator.

RRS James Clark Ross Cruise JR16003 XBT: Data Quality Report

XBT depth profiles extended to the full length of the wire of 1830.5m for Lockheed Martin Sippicon T-5 probes.

Flags were applied where the instrument kept recording data values beyond the bottom seafloor. Bottom seafloor depths have been determined where possible by comparing GEBCO baythmetry chart readings and echosounder readings available from the cruise underway data to aid decision making. Additional flags were applied to noisy data. Please use the flagged data series below with caution.

• Series Reference 1815644 - Flagged from cycle 2159 to 2227.
• Series Reference 1815656 - Flagged entire profile. Originator stated XBT had failed in cruise report.
• Series Reference 1815712 - Flagged from cycle 386 to the end of profile.
• Series Reference 1815724 - Flagged from cycle 634 to the end of profile.
• Series Reference 1815736 - Flagged from cycle 292 to the end of profile.
• Series Reference 1815748 - Flagged from cycle 237 to the end of profile.
• Series Reference 1815761 - Flagged from cycle 2518 to the end of profile.
• Series Reference 1815797 - Flagged from cycle 164 to the end of profile.
• Series Reference 1815804 - Flagged from cycle 333 to the end of profile.
• Series Reference 1815816 - Flagged from cycle 2894 to the end of profile.
• Series Reference 1815828 - Flagged from cycle 2420 to the end of profile
• Series Reference 1815841 - Flagged from cycle 2442 to the end of profile.
• Series Reference 1815853 - Flagged from cycle 177 to the end of the profile.
• Series Reference 1815865 - Flagged from cycle 169 to the end of the profile.
• Series Reference 1815877 - Flagged from cycle 2229 to the end of profile.
• Series Reference 1815945 - Flagged from cycle 427 to the end of profile.
• Series Reference 1815957 - Flagged from cycle 320 to the end of profile.
• Series Reference 1815994 - Flagged from cycle 754 to the end of profile.
• Series Reference 1816008 - Flagged from cycle 285 to the end of profile.
• Series Reference 1816057 - Flagged entire profile. Originator stated XBT had failed in cruise report.
• Series Reference 1816070 - Flagged entire profile. Originator stated XBT had failed in cruise report.
• Series Reference 1816082 - Flagged entire profile. Originator stated XBT had failed in cruise report.
• Series Reference 1816101 - Flagged from cycle 2262 to the end of profile.
• Series Reference 1816149 - Flagged from cycle 1442 to the end of profile.
• Series Reference 1816150 - Flagged from cycle 643 to the end of profile.

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

Instrument description

Lockheed Martin Sippican T-5 XBT Probe

The Expendable Bathythermograph system uses a sea water ground. As soon as an electrode within the nose of the expendable probe makes contact with the water, the circuit is complete and temperature or sound velocity data can be telemetered to the ship-board data processing equipment. The T-5 XBT Probe can be used within a maximum depth of 1830 m, with a rated ship speed of 6 knots and has a vertical resolution of 65 cm.

Manufacturer specifications can be found here

RRS James Clark Ross Cruise JR16003 XBT: BODC Processing

BODC Processing

Files were submitted to BODC in .edf format, which can be opened in a text editor. The .edf file contained depth, temperature, sound velocity and resistance data. Additional metadata was also stored in the header of the file such as deployment time, latitude, longitude, probe type, terminal depth, depth coefficients, constant salinity value used to derive sound velocity.

Files were reformatted to BODC internal NetCDF file format using established procedures and were screened for quality control purposes using internal software Edserplo. No conversions were applied to originator data values. Originator variable were mapped to appropriate BODC parameter codes for standardisation purposes, the below table summarises this.

Data were screened using BODC internal software EDSERPLO for data quality purposes. Original dataset which includes the resistance data channel is available upon request.

RRS James Clark Ross Cruise JR16003 XBT: Originator's Processing

Originator's Sampling Protocol

A total of 48 Lockheed Martin Sippican T-5 Expendable Bathythermographs (XBTs) were deployed to profile the water column on transects at predefined location within the Western Core Box (WCB) and at the polar front transect. The XBT deployments for event 23, 151, 153 and 154 failed.

Originator's Processing

Data were recorded and displayed in real-time using Sea-Air Systems software:

• WinMK21 v2.13.1
• MIK21COEF v2.9.1
• MK21AL v2.14.1

Pre-launch of XBT deployments, metadata were entered into the software and checks were made to ensure the PC time was synced to ship time (GMT). Output files were stored in .edf format, an ASCII output of profile data.

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: