A big day for glider operations. We celebrate a new addition of the Scripps/WHOI Spray glider and the recovery of the SAM Webb glider after a great mission. We also want to highlight a new front image for the Deepwater web site. The reason we have switched from an interactive Google glider image to a flat image is we are dealing with a range of users that span corporate and federal users with stringent security filters that have been providing problems. So we now have a flat daily updated image however there is a web button to get to the google interactive button.
We are still working out the hand-shaking with the Spray glider, which we will resolve tomorrow but we are excited to have them join the team. The Spray glider was deployed close to the NAVO gliders which are located on the further reaches of the western boundary of the oil spill. The NAVO gliders have been making good progress characterizing the outer edge of the oil spill. The backscatter patterns show the continued dramatic mesopelagic patterns that are not mirrored by the CDOM and chlorophyll fluorescence.
The iRobot/APL glider is doing a great job surveying a region in the immediate area of the oil spill. We also salute the RV Weatherbird team returning to shore providing a needed calibration dataset. The Seaglider has been doing a great job surveying showing alot of complexity in optical backscatter that is not mirrored in the chlorophyll or CDOM fluorescence. The CDOM fluorescence remains the high priority need in the coming week.
The USF glider SAM after a successful mission has been recovered. We toast the recovery boat crews. The northen-most glider on the Florida shelf is now RU23. The gliders shows remarkable similar features of the other Florida gliders. The specific features which show consistent feature across the Florida shelf is the statified with rather uniform enhanced optical backscatter at depth. The chlorophyll fluorescence is enhanced at depth but for all the gliders on the shelf show the intermittent enhanced signals at specific locations. This might imply along shelf transports.
The problem is RU23 has encountered some flying difficulties, which has lead to a day long conversation between Rutgers and Mote Marine lab. Below is some of the analysis by David Aragon from Rutgers with Mote. The general consensus is that Ru23 has lost a wing. The reason for loss remains an open question, but shark is the strong candidate. Mote is planning an at sea inspection and repair on Thursday (thanks!)
ANALYSIS FROM DAVID ARAGON TODAY
Grabbed an MBD from the vehicle, certainly looks characteristic of wing loss to me. The roll record is usually what verifies this. If any have anything they would like to see or look at let me know.
Remember this is the rechargeable lithium glider:
.3 km / hr, will try to improve through today by swimming a bit shallower (we are bouncing off density gradient and floating half the segment)
.7 km / hr before the incident, so flying at less than 1/2 speed right now
~11 days to get back to deployment spot at which point could likely charge overnight and redeploy?
5 days, 82% battery
~ 20 days left on deployment, should recover when getting near 10% remaining
~ 25 day total deployment, not too shabby for rechargeable and full payload (likely attributed to warm water)
460 KB MBD from segment we lost the wing, strange pressure sensor blip at 4 meters deep, glider stopped climbing for a moment
worth pulling this file? or wait till freewave? I think we are pretty sure its a wing. Will add a bit more roll and heading data into sbd to hold confirmation
Items for boat rendezvous (or recovery depending on what we decide to do) (starting the brainstorming)
1-2 spare wing rails
spare wings, heaviest you have as I think this glider had rubber wings which weighed 280 g in air
T handle, spare screws
Likely would have to spend some time out there just to make sure that nothing else is wrong with the glider, as its a long trip and would hate to leave a wounded glider with deeper problems than whats apparent through iridium.
Thanks all. She has turned around and will put on longer missions.
RU21 has reached the shelf as seen in the bottom bathymetry. Patterns remain consistent with the other shelf gliders and its own patterns on the offshore.
Meanwhile the U Delaware glider in the south continues a relentless consistent cross shore survey.