Last fall, the Coastal Endurance team conducted an initial test run of a Slocum G3 glider to determine its capabilities and operational differences to the G2 glider, currently used by the Endurance and Coastal & Global Scale Nodes (CGSN) teams. The test was prompted by glider vendor Teledyne’s announcement that it would no longer support the G2 glider past 2023.
Both the Endurance and CGSN teams have since expanded testing. The Endurance team recently completed a two-month deployment of a G3 glider, with plans to deploy another later this summer. The CGSN team, which operates the Pioneer and two global arrays, is testing three G3 gliders. One is being tested for use as a coastal glider at the Pioneer Array and the other two are being configured for the Irminger Sea and Station Papa global sites.
“Recent testing at the Pioneer Array was really valuable for us,” said Peter Brickley, CGSN Observatory Operations Lead. “We got a chance to see that our missions were workable, we found and made the changes that were needed, and we were also able to get a better estimate of how much energy these things were going to use.”
[media-caption path="https://oceanobservatories.org/wp-content/uploads/2021/07/IMG_3107-2-1-scaled.jpg" link="#"]Diana Wickman of the CGSN team at Woods Hole Oceanographic Institution is responsible for keeping the CGSN gliders operational. Here she has stripped the exterior of the glider to ensure that all internal parts are functional. Once refurbished, the gliders are tested in a water tank before being deployed at sea. Credit: Jade Lin ©WHOI.[/media-caption]The G3 gliders use more power than the G2 gliders, so the logistics of when and where they are deployed will require some adjustments. When powered by primary lithium batteries, for example, the G2 gliders can be deployed for about 90 days. The initial tests of the G3 gliders showed they could last in the water for around 75 days using primary lithium batteries. For trial runs using rechargeable batteries, the time in the water for the G3 gliders was reduced to about 30 days.
OOI is working with the vendor to evaluate operational alternatives to extend the operating window of the G3 gliders.
Improvements may require tweaking
“The rechargeable batteries are a really cool feature, but because they are about half of the energy density of the usual batteries, we’re going to have to adjust sampling schemes and plans for time in the water when we use the rechargeable batteries,” said Stuart Pearce, who works with the Endurance gliders. For now, the Endurance team intends to test the rechargeable batteries in the near shore gliders in the spring and summer when they can reliably get out to sea to recover and deploy the gliders.
G3 gliders also come equipped with larger volume buoyancy pumps than the G2 models in response to users’ feedback. “The gliders rise and fall in the water column by changing their volume and therefore density,” explained Pearce. “The new gliders have 800-1000 cubic centimeters of fluid volume to rise and dive with, compared to the 500 cubic centimeters of volume in the G2 gliders. This means that the G3 gliders can climb and dive in a greater buoyancy range.” One option being explored is whether power consumption can be reduced by adjusting the volume of the reservoir fluid needed to make the glider rise and fall.
The new G3 gliders incorporate some changes that address feedback from OOI and other users who have operated G2 gliders. “If you put anything in the ocean and use it as much as we do, you will find things that unexpectedly fail,” said Peter Brickley, CGSN Observatory Operations Lead. “We’ve been operating gliders since 2013, so we have lots of experience. In the early days, for example, we had a lot of problems with the digifin, the steering rudder that’s on the back of the vehicle. We worked closely with Teledyne to document and study this issue and they ultimately made needed improvements.” Other issues have been similarly addressed over the years.
Integrating the new G3 gliders into its Global Arrays may offer greater reliability as older G2 models are phased out. Diana Wickman, Senior Engineering Assistant II at Woods Hole Oceanographic Institution who keeps the CGSN gliders operational, explained “We need the equipment to work really well, and it needs to work for the entire year. At Pioneer, if we have problems, we can replace vehicles that are struggling with vehicles that we can refurbish in-house, but we simply can’t do that at the global sites.”
For now, the teams will continue with testing to make sure the new gliders will work for OOI’s purpose of long-term ocean monitoring.
OOI shares its glider data with the Integrated Ocean Observing System (IOOS) Glider Data Assembly Center and the OceanGliders project, which is a part of the Global Ocean Observing System (GOOS). Both serve as repositories for researchers interested in using glider data.
In January, the OOI Operations Manager, Thomas Wims, attended the two-day US Underwater Glider Workshop at the INFINITY Space Center in Mississippi, hosted by the Interagency ocean Observation Committee (IOOC). Over 90 people were in attendance from approximately 40 organizations representing universities, federal government agencies, nonprofits, industry, and the US Navy.
The focus of the workshop was to facilitate the sharing of best practices of glider operations across programs. Most programs in attendance had three or fewer gliders. This meeting provided a key avenue for these smaller groups to seek guidance from industry as well as organizations with larger fleets, like the US Navy, the OOI, and Rutgers University.
“With the second largest glider fleet in the nation, we were thrilled to be asked to come to the table during this workshop,”says Thomas Wims, OOI Operations Manager. “It is important to share what we know and what we have learned over the last several years of deploying and maintaining our glider fleet. A key element of the OOI is to foster collaborations, share best practices, and provide access to data.”
The OOI has 64 total gliders in its fleet, with up to 32 deployed at any time. These gliders are located at the two Coastal Arrays as well as at the four high latitude, open ocean sites of the Global Arrays. More information on OOI Gliders, can be found on the OOI Website.
One of the take homes from the workshop was the need to share more glider data across organizations, to break down the silos of data collected and stored at individual organizations. Participants discussed how critical it is to share data across similar regions, gaining a broader view of the water environments. OOI glider data are currently publicly available through the OOI Data Portal, as well a part of the growing Glider DAC resource collated by the Integrated Ocean Observing System (IOOS).Read More