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Observations and Data

NorEMSO aims to deliver high-quality water column observations in the Nordic Seas.

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The fundamental purpose of NorEMSO is the long-term production of high-quality observational data, which are fully integrated into the EMSO ERIC by establishing an operational data flow. A data management and implementation plan will ensure curation, preservation and sustainability.

By adhering to the Open Research Data Pilot under the H2020 of the European Commission and the FAIR data management principles following the ‘gold’ standard, the NorEMSO data management plan also ensures free and open access to all metadata and data (NRT and delayed mode) and results generated.

 

Observations from glider missions

Data management

Data and metadata management of Slocum gliders

 

Mission metadata are submitted OceanGliders (https://www.oceangliders.org/) following the JCOMMOPS metadata requirements.  

A Slocum glider log full resolution data internally but a subset of this data at a 60s interval is sent from the glider each time it surfaces (every 1-3hrs). This reduced data from the flight and science data files are sent from the glider via Iridium to a data hosting service through Teledyne Webb. The data are transferred to UIB servers and pulled by the Norwegian Marine Data Centre at the Institute of Marine Research in Bergen, where near-real-time (NRT) processing is performed to produce data files in Everyone's Gliding Observatories (EGO, https://www.ego-network.org) format. The EGO gliders NetCDF format (http://dx.doi.org/10.13155/34980) is based on the Climate and Forecast (CF) specification. NRT data are then pushed daily to the Coriolis data portal (http://www.coriolis.eu.org), where the data are stored. Data is also delivered on GTS through the Norwegian Meteorological Institution. These NRT data are open access with CC BY 4.0 (Creative Commons Attribution 4.0 International) license and are also used for assimilating in operational models. Coriolis coordinates the MyOcean in-situ Thematic Assembly Center and provides in-situ data needed to constrain and validate the MyOcean global and regional Modelling and Forecasting Centers (so-called COPERNICUS Marine Core Service).  

Once a glider is recovered the completed mission is reported to JCOMMOPS. The post-processing of the glider data is typically finalized within 6 months after the mission ended. The quality control, the final product (so-called Delayed Mode data) are then submitted to the Norwegian Marine Data Centre (https://nmdc.no/) in open access with CC BY 4.0 license, where it is stored and uniquely identified with a DOI. Overall, we aim to follow the FAIR data management principles following the ‘gold’ standard.

 

Slocum with Microrider

 

The science sampling strategy is flexible and will depend on deployment duration but a likely regime would be CTD: sampling 4s interval on dive and climb. 

Microrider: default rate of 512Hz for fast sensors. Sampling during dive, then dive and climb in key areas, possibly turned off during the last leg.   

A subset of this data at a 60s interval is sent from the glider each time it surfaces (1-3hrs), note turbulence data is averaged and only useful for indicating the health of the instrument. Flight and science data files (sbd and tbd respectively) are sent from the glider via iridium (both RUDICS and PSTN) to a server hosting the glider piloting application SFMC. 

Data is transferred from SFMC to UIB servers where near real-time processing produces data files in EGO format which is then pushed to the open-access Coriolis platform.