Indian Ocean between Christmas Island and Java

Reference numbers; Vertical spatial coordinates; Salinity of the water column; Temperature of the water column; Horizontal spatial co-ordinates; Electrical conductivity of the water column; Density of the water column; Horizontal velocity of the water column (currents)

Data loggers

This data set includes measurements made by conductivity, temperature, and pressure sensors attached to two Seagliders deployed near Christmas Island in the Indian Ocean (10.47 degrees S, 105.73 degrees E) on the 23rd of January 2019. They travelled to two waypoints in the direction of the coast of Java; Seaglider SG641 arrived at waypoint ELOX1 (10.166 degrees S 105.9 degrees E) on the 25th January 2019 and SG537 at waypoint ELOX2 (9.25 degrees S 106.533 degrees E) on 30th of January 2019. They then stayed at their waypoints until their final dives on the 4th of April 2019 and 13th of April 2019, respectively. Each glider dataset was processed through the UEA Seaglider toolbox (available here: http://bitbucket.org/bastienqueste/uea-seaglider-toolbox). The corrections did not remove all uncertainty from the salinity data in the thermocline region, therefore, salinity and other derived variables were set to null if still not considered trustworthy. The sampling interval varied throughout the deployment for the SG537 with a minimum sampling rate of 4-5 seconds. The measurements were carried out in succession and the time stamp corresponds to the first measurement of each cycle. The data from the SG641, a scicon glider, was interpolated to 1 second intervals. Depth estimates for each different sensor are also provided. Both Seagliders are from the University of East Anglia (UEA), UK glider facility, and were deployed and piloted by UEA and associated personnel. These gliders were deployed as part of the Equatorial Line Observations (ELO) project, whose primary objective was to understand ocean-atmosphere interactions associated with atmospheric convectively coupled equatorial waves (CCEWs) and the Madden-Julian Oscillation (MJO). The ELO project is funded jointly by the Natural Environmental Research Council, UK (grant reference NE/R012431/1), and the National Science Foundation, USA (grant reference 1724741).

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