Metadata Report for BODC Series Reference Number 1808776

• 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 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

TRIAXYS Directional Wave Buoy

The TRIAXYS Directional Wave Buoy uses the TRIAXYS Next Wave II Sensor for continuous wave sampling and accurate wave data.

Specifications

For more information about this model see the manufactures TRIAXYS manual.

Originators Processing RRS James Cook JC088 Site SF4 TRIAXYS Directional Wave Buoy Mooring data

Originator's Protocol for Data Acquisition and Analysis

The RRS James Cook JC088 cruise deployed the TRIAXYS Directional Wave Buoy to primarily support the Ocean Surface Mixing, Ocean Sub-mesoscale Interaction Study (OSMOSIS) consortium. The OSMOSIS consortium overall aim is to develop new, physically based and observationally supported, parameterisations of processes that deepen and shoal the OSBL, and to implement and evaluate these parameterisations in a state-of-the- art global coupled climate model, facilitating improved weather and climate predictions.

JC088 was a 26 day cruise sailing on 28 June 2013 from King George V Dock, Govan to the Malin Shelf, returning to Southampton on 24 July 2014.

Sample collection

One wave rider buoy was deployed and recovered during the JC088 cruise. The wave rider buoy sent in real-time data consisting of significant wave height, mean wave height, significant wave period and mean wave period over the deployment.

Data Processing

The TRIAXYS Directional Wave Buoy performed its own processing onboard the instrument and transmitted data in real-time. The software on the instrument performs zero-cross analysis to compute various time-domain wave parameters.

The sampling period of the wave rider buoy was for 15 minutes and then the instrument takes an average of the measurements collected over this period. There's a 5 minute delay whilst the instrument does the calculations and transmits the data. The time stamp applied to the data is from the previous 20 minutes including the 5 minute delay.

Two files were sent to BODC. A high resolution (~1 second) .wav file including the raw real-time transmitted data and a Matlab structured file including the data averaged over a 15 minute sampling period and the metadata. BODC will process the Matlab structured file containing the data and metadata. The .wav file will not be processed but is available on request from BODC.

Field Calibrations

No field calibrations were taken for the wave rider buoy data.

References

Naveira-Garabato, A. C. et al. (2013). 'Ocean Surface Mixing, Ocean Sub-mesoscale Interaction Study (OSMOSIS)'. Cruise Report No. 25 National Oceanography Centre, Southampton.

Inall, M. E et al.(2013). 'FASTNEt Cruise to the Malin Shelf Edge'. Cruise Report The Scottish Association for Marine Science.

Processing by BODC of RRS James Cook JC088 Site SF4 TRIAXYS Directional Wave Buoy Mooring data

The data arrived at BODC in 1 Matlab structured file representing the data collected from the TRIAXYS Directional Wave Buoy during cruise JC088. The data were reformatted to BODC's internal NetCDF format. The following table shows the mapping of variables within the Matlab file to appropriate BODC parameter codes:

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.

Project Information

Ocean Surface Mixing, Ocean Sub-mesoscale Interaction Study (OSMOSIS)

Background

The Ocean Surface Mixing, Ocean Sub-mesoscale Interaction Study (OSMOSIS) consortium was funded to deliver NERC's Ocean Surface Boundary Layer (OSBL) programme. Commencing in 2011, this multiple year study will combine traditional observational techniques, such as moorings and CTDs, with the latest autonomous sampling technologies (including ocean gliders), capable of delivering near real-time scientific measurements through the water column.

The OSMOSIS consortium aims to improve understanding of the OSBL, the interface between the atmosphere and the deeper ocean. This layer of the water column is thought to play a pivotal role in global climate and the productivity of our oceans.

OSMOSIS involves collaborations between scientists at various universities (Reading, Oxford, Bangor, Southampton and East Anglia) together with researchers at the National Oceanography Centre (NOC), Scottish Association for Marine Science (SAMS) and Plymouth Marine Laboratory (PML). In addition, there are a number of project partners linked to the consortium.

Scientific Objectives

• The primary goal of the fieldwork component of OSMOSIS is to obtain a year-long time series of the properties of the OSBL and its controlling 3D physical processes. This is achieved with an array of moorings (two nested clusters of 4 moorings, each centred around a central mooring) and gliders deployed near the Porcupine Abyssal Plain (PAP) observatory. Data obtained from this campaign will help with the understanding of these processes and subsequent development of associated parameterisations.
• OSMOSIS will attempt to create parameterisations for the processes which determine the evolving stratification and potential vorticity budgets of the OSBL.
• The overall legacy of OSMOSIS will be to develop new (physically based and observationally supported) parameterisations of processes that deepen and shoal the OSBL, and to implement and evaluate these parameterisations in a state-of-the-art global coupled climate model, facilitating improved weather and climate predictions.

Fieldwork

Three cruises are directly associated with the OSMOSIS consortium. Preliminary exploratory work in the Clyde Sea (September 2011) to hone techniques and strategies, followed by a mooring deployment and recovery cruise in the vicinity of the Porcupine Abyssal Plain (PAP) observatory (in late Summer 2012 and 2013 respectively). Additional opportunist ship time being factored in to support the ambitious glider operations associated with OSMOSIS.

Instrumentation

Types of instrumentation and measurements associated with the OSMOSIS observational campaign:

• Ocean gliders
• Wave rider buoys
• Towed SeaSoar surveys
• Microshear measurements
• Moored current meters, conductivity-temperature sensors and ADCPs
• Traditional shipboard measurements (including CTD, underway, discrete nutrients, LADCP, ADCP).

Contacts

Data Activity or Cruise Information

Data Activity

OSMOSIS Wave Rider Buoy

The short term mooring SF4 wave buoy was deployed and recovered during the FASTNEt cruise RRS James Cook JC088 but the purpose of this deployment was to primarily support the Ocean Surface Mixing, Ocean Sub-mesoscale Interaction Study (OSMOSIS) consortium.

Instruments deployed on the mooring

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: