Ocean Microstructure Glider observations in Cook Strait, New Zealand

Date 2022-06-30
Author(s) O'Callaghan JoanneORCID1, Elliott Fiona2
Affiliation(s) 1 : National Institute of Water and Atmospheric research, Ocean Observations, Wellington, New Zealand
2 : Geophysical Institute, University of Bergen, Norway
DOI 10.17882/89143
Publisher SEANOE
Keyword(s) tidal channel, Cook Strait, glider, microstructure, stratification, turbulence, current speeds

Here we present an extensive dataset of turbulence from an Ocean Microstructure Glider (OMG) campaign in an energeticly-forced coastal system, Te Moana-o-Raukawa (Cook Strait), the water channel separating the North and South islands of Aotearoa (New Zealand). The microstucture data is combined with glider-based background stratification to study both the mechanisms driving energetic turbulence and its fundamental capacity to mix stratification. 

This study used a Teledyne Webb Research Slocum G2 glider equipped with a Seabird CTD sensor and a Rockland Scientific MicroRider 1000-EM microstructure package. Temperature, conductivity, and pressure data were sampled at 0.5 Hz, and subsequently processed to remove spikes. The accuracy within calibration range of temperature and conductivity were +/-0.002oC and +/-0.0003 S m-1, respectively. Glider data processing was completed using the SOCIB glider toolbox (https://github.com/socib/glider_toolbox; Troupin et al. (2015)). Glider data processing includes salinity lag correction for the thermal lag error for the un-pumped CTD unit. Data were averaged in vertical bins of 1 m. Microstructure measurements of shear and temperature are gathered at 512 Hz, and direct current speeds are recorded by the electromagnetic (EM) current meter mounted adjacently to the microstructure probes.

Licence CC-BY
Acknowledgements We are grateful to the Captain and crew of the RV Kaharoa and RV Ikatere. Funding was provided by the Royal Society of New Zealand Marsden Fund (NIW1702) and the NIWA Capex investment programme.
Sensor metadata

Teledyne Webb Research Slocum G2 glider (Manaia, #517) equipped with Seabird CTD sensor and Rockland Scientific MicroRider 1000-EM.

File Size Format Processing Access
Level 1 Slocum ocean glider observations 352 MB NC, NetCDF Processed data Open access
MicroRider 1000-EM observations 8 GB ASC Raw data Open access
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How to cite 

O'Callaghan Joanne, Elliott Fiona (2022). Ocean Microstructure Glider observations in Cook Strait, New Zealand. SEANOE. https://doi.org/10.17882/89143