As part of the ONR-funded 'Northern Arabian Sea Circulation—autonomous research (NASCar)' DRI, spray gliders surveyed from the northern edge of the Mascarene Plateau, crossing the equator repeatedly, then surveyed southward back toward the Seychelles prior to recovery.

One glider mission was conducted in each of 2017 and 2018. Missions were timed to capture the onset of the southwest (northern hemisphere summer) monsoon at the equator. Additional plots of these data are available at

MAR 2017 - JUN 2018

Temperature, Salinity, Doppler Velocity, Acoustic Backscatter, Depth-Averaged Velocity

  • Region: Western Equatorial Indian Ocean
  • PI: Robert E. Todd
  • Funded by: Office of Naval Research

Project Dataset Files

Cleaned, post-processed and vertically binned to meet user needs

Access Options

Data are available in CF compliant NetCDF files and are also available via our ERDDAP server which offers additional file types, data subsetting, visualization options and more.


MAR 2017 - JUN 2018

Project Dataset Processing

  • Averaged to 10-m vertical bins
  • Bins improve ease of use
  • Bins allow for easy integration of ADCP acoustic backscatter and velocity data
  • Filtered using QC flags
  • Only high-quality data are represented in each bin

How to Cite

When using this dataset, please cite the data as:

Todd, R. E. (2020). Spray glider observations in support of NASCar [Data set]. Scripps Institution of Oceanography, Instrument Development Group. doi: 10.21238/S8SPRAY0053


Todd, R.E. (2020), Equatorial circulation in the western Indian Ocean during onset of the 2018 summer monsoon and links to the Bay of Bengal, Geophys. Res. Lett., 47, e2020GL087215; doi: 10.1029/2020GL087215
Centurioni, L., V. Hormann, L.D. Talley, I. Arzeno, L. Beal, M. Caruso, P. Conry, R. Echols, H.J.S. Fernando, S.N. Giddings, A. Gordon, H. Graber, R. Harcourt, S.R. Jayne, T.G. Jensen, C.M. Lee, P.F.J. Lermusiaux, P. L’hegaret, A.J. Lucas, A. Mahadevan, J. McClean, G. Pawlak, L. Rainville, S. Riser, H. Seo, A. Shcherbina, E. Skyllingstad, J. Sprintall, B. Subrahmanyam, E. Terrill, R.E. Todd, C. Trott, H.N. Ulloa, H. Wang (2017), Northern Arabian Sea Circulation—autonomous research (NASCar): A research initiative based on autonomous sensors, Oceanography, 30(2), 74-87; doi: 10.5670/oceanog.2017.224