Metadata Report for BODC Series Reference Number 2274868

• 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

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

Onset HOBO TidbiT V2 {UTBI-001} temperature logger

A temperature logger that measures temperatures over a wide temperature range. It is designed for outdoor and underwater environments and is waterproof to 300 m. A solar radiation shield is required to obtain accurate air temperature measurements in sunlight (RS1 or M-RSA Solar Radiation Shield). With an operational temperature range between -20 degrees Celsius and +70 degrees Celsius, the TidbiT v2 has an accuracy of +/-0.21 and a resolution of 0.02 degrees Celsius.

For more information, please see this document: https://www.bodc.ac.uk/data/documents/nodb/pdf/Onset_TidbiT_v2_Temp_Data_Logger.pdf

JR18001 (AMT28) Simple Oceanographic floating Device TidbiT SST measurements BODC Processing

Sea surface temperature (SST) was measured at 62 sites during the RRS James Clark Ross cruise JR18001 (AMT28), from the 23^rd of September 2018 to the 29^th of October 2018. This was from Harwich (UK) to Mare Harbour (Falkland Islands). A TidbiT v2 sensor (Onset HOBO TidbiT V2 {UTBI-001} temperature logger) recorded SST at 31 of the 62 sites. This was calibrated to an NPL-traceable Hart Scientific 1504 temperature bridge and a Thermometrics ES 225 temperature probe before being attached to a Simple Oceanographic floating Device (SOD) at 1 m. The SOD operated for around 20 minutes at each station, for both predawn and noon stations. For BODC processing, the midpoint time at each station was used. The SST data were supplied to BODC in .csv format and converted to the BODC internal format.

During transfer, the originator's variables were mapped to unique BODC parameter codes. The following table shows the parameter mapping:

Following transfer, the data were screened using BODC in-house visualisation software.

Sea surface temperature and meteorological measurements: JR18001 (AMT28) Originator Data Processing

Sea surface temperature (SST) was measured at 62 sites during the RRS James Clark Ross cruise JR18001 (AMT28), from the 23^rd of September 2018 to the 29^th of October 2018. This was from Harwich (UK) to Mare Harbour (Falkland Islands), using a Simple Oceanographic floating Device (SOD). SST was also measured continuously along the cruise using an Infrared SST Autonomous Radiometer (ISAR).

Sampling protocol

Simple Oceanographic floating Device (SOD) measurements

SST was recorded using a TidbiT v2 sensor (Onset HOBO TidbiT V2 {UTBI-001} temperature logger) and an iButton temperature sensor (Maxim Integrated Thermochron iButton DS1922L temperature logger). This was calibrated to an NPL-traceable Hart Scientific 1504 temperature bridge and a Thermometrics ES 225 temperature probe before being attached to a Simple Oceanographic floating Device (SOD) at 1 m. SST was also recorded using a Smartfin internal and external temperature sensor at 0.1 m, also attached to the SOD.

The SOD was a swimming float that had been modified to incorporate Future Fin sockets (for attaching surfboard fins), positioned in a similar manner to how they are on a surfboard, and two bodyboard plugs for attaching rope to either side of the float. On the underside of the SOD, a 1 m rope was attached to a bodyboard plug. Weights were placed to steady the device when in use at the end of the 1 m rope. On the topside of the SOD, a 10 m rope was attached for lowering the float into the water. Two surfboard fins were attached to the Future Fin sockets on the underside of the SOD. One of the fins was a Smartfin.

For the first half of the cruise (31 stations), two miniature temperature sensors were attached to the end of the 1 m rope (to the weights) to measure water temperature at 1 m, with a white disk used to shelter the sensors from sunlight. One sensor was a Maxim Integrated iButton DS1922L temperature logger, housed in a Thermochron waterproof capsule (DS9107) and the other a TidbiT v2 temperature logger. On very hot sunny days, these sensors were also covered with tin foil to minimise any additional heating from sunlight.

The Smartfin was charged, and all sensors were launched prior to each SOD deployment. The SOD was lowered into the water from the starboard side of the RRS James Clark Ross using a 10 m rope. At stations where the currents were pushing the SOD into the side of the ship, a telescopic rod was used to extend the rope further away from the ship. The SOD was operated for around 20 minutes at each station, for both predawn and noon stations. Once recovered, the data were downloaded onto a laptop and backed-up on the ships hard drive. HOBOware software and a HOBO USB Optic Base Station (BASE-U-4) were used to launch and to upload temperature data from the TidbiT v2 logger. 1-Wire iButton software was used to launch and to upload temperature data from the iButton. The Smartfin data were transferred daily from the mobile phone onto the Smartfin server, through use of a dongle (Ethernet port in the phone) that allowed access to the internet from the phone and subsequent use of the Smartfin app.

Originator quality note

62 stations were sampled in total, with only one station that yielded unsatisfactory data for the SOD, owing to high gusting winds lifting the SOD into the air. This cycle has also been removed from all data sources. For subsequent deployments in high winds, increased weight was added to the 1 m rope and the SOD was found to operate reasonably.

Analytical protocol

Median and robust standard deviations (SDV) of all variables were computed over the duration of the SOD deployments at each station (removing initial Smartfin, iButton and TidbiT data where the sensors had not responded to the water temperature, noting the sensors had different response times). Four laboratory comparisons of the SOD sensors (Smartfin, iButton and TidbiT v2) with an accurate temperature probe NPL-traceable Hart Scientific 1504 temperature bridge and Thermometrics ES 225 temperature probe were also conducted during the AMT28 voyage, over a temperature range of 17-35 degrees Celsius, in a recirculating water bath. Mean differences, referenced to the temperature probe, were removed from all iButton, TidbiT v2 and Smartfin Internal sensors used in the SOD deployments, but not from the Smartfin external sensor, as it was found to be in excellent agreement with the temperature probe.

Continuous measurements

SST was also recorded continuously, using a University of Southampton Infrared SST Autonomous Radiometer (ISAR). This was mounted on the port side of the ship's foremast at a 45 degree angle relative to the ship's centre line, measuring SST skin data. The data were logged using a data logger located in the mail room of the ship and connected to the ship's network. A low-power miniature 8-channel GPS unit (Trimble Lassen sk2 module) provided real-time position and UTC time for the system, and a low-power Precision Navigation TCM-2 electronic compass module, based on a magneto-inductive magnetometer, provided pitch and roll measurements.

Please see the JR18001 cruise report for further detail of originators processing.

Project Information

Marine LTSS: CLASS (Climate Linked Atlantic Sector Science)

Introduction

CLASS is a five year (2018 to 2023) programme, funded by the Natural Environment Research Council (NERC) and extended until March 2024.

Scientific Rationale

The ocean plays a vital role in sustaining life on planet Earth, providing us with both living resources and climate regulation. The trajectory of anthropogenically driven climate change will be substantially controlled by the ocean due to its absorption of excess heat and carbon from the atmosphere, with consequent impacts on ocean resources that remain poorly understood. In an era of rapid planetary change, expanding global population and intense resource exploitation, it is vital that there are internationally coordinated ocean observing and prediction systems so policy makers can make sound evidence-based decisions about how to manage our interaction with the ocean. CLASS will underpin the UK contribution to these systems, documenting and understanding change in the marine environment, evaluating the impact of climate change and effectiveness of conservation measures and predicting the future evolution of marine environments. Over the five-year period CLASS will enhance the cost-effectiveness of observing systems by migrating them towards cutting edge autonomous technologies and developing new sensors. Finally, CLASS will create effective engagement activities ensuring academic partners have transparent access to NERC marine science capability through graduate training partnerships and access to shipborne, lab based and autonomous facilities, and modelling capabilities.

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: