Glider update August 5 2010
Sorry for the lack info of the over the last week, but it has been the particuarly overwhelming. Regardless, the gliders have been flying and doing well. We start with info from the iRobot/APL team which successfully recovered the Seaglider on July 30. The Seaglider deserves a toast having flown for over 70 days, and reports from the deck of the ship did not suggest almost no bio-fouling. GREAT WORK!! The dock location of the Seaglider is visible in the Google image below. The Google image is missing three gliders, the NAVO gliders remain in the water, but some handshaking issues have limited our ability to grab the data. We hope to have this rectified in the coming days. The Scripps/WHOI Spray glider continues to move and out of the large eddy in the Gulf, the data however is described below. So as of today we have six gliders in the water.
So lets start with the Spray glider which has been collecting some beautiful data offshore in the Gulf now offshore Florida; however the glider appears to have been caught in the back side of the eddy and is now being pulled west. The movement into and out of the eddy is clearly visible in the temperature data with the large deepening of the warm surface waters in the eddy itself. The edges of the eddy clearly reveal the strong zonal and meriodal currents. What is particularly beautiful is the vertical patterns in the acoustic backscatter signal plots. The patterns clearly reveal the presence of vertically migrating animals inside and outside of the eddy.
Ru21 has been deployed, handshaking will be resolved in the next day, but we have some beautiful data from the USF and Mote Marine gliders.The USF SAM glider is heading onshore. The glider reveals low salinity plumes neashore. Associated with the low salinity plumes is enhanced particles and CDOM. There minor indications of enhanced chlorophyll. Offshore the two layer system reveals an enhanced CDOM offshore in the bottom waters, a deep chlorophyll maximum Optical backscatter a good proxy for particles correlates with the chlorophyll on the shelf, but offshore is enhanced in the bottom boundary layer near the seafloor, not with the deep chlorophyll maximum.
WALDO shows in its nearshore survey, a two layer system, however in some locations system does appears to have 3 layers. Chlorophyll is enhanced in both the nearshore and in the bottom waters. In contrast the CDOM is only enhanced at depth.