Good job to Mote Marine Lab today on getting Waldo in the water. Waldo’s a 30 meter Slocum glider that was deployed just north of the Florida Keys by Alan Hails and Cory Boyes, with shore support provided by Bob Currier.
The glider has a science payload containing a 3-wavelength optical backscatter puck, a CDOM and chlorophyll a puck and a CTD.
Thanks to Gary Kirkpatrick and his crew on all of their hard work today.
Also, thanks to Geoff Shilling, Rosario Robert, Craig Lee and others (APL/UW/iRobot) for providing access to SG515 data and deployment kmzs.
Both glider trajectories are available on the front page, along with the previous 2 (ru21 and bass).
Good work to everyone involved.
See accompanying map image:
Message From Sam Walker:
*VERY IMPORTANT *that folks do not fly gliders anywhere near the
wellhead. There is a ton of cabling and big-time operations going on
right now as BP prepares for the "topkill". Please post a notice to
this effect on your site. I will remain POC here for the next week -
and glad to help set up missions.
The zonation map on our wiki shows IOOS glider zones - folks need to
meet that need for data on the shelf and outside the immediate well-head
area. Tons of ships in there doing sampling of the water and using
fluorometry too - so no need for the gliders to get tangled up.
I would like to keep you and the IOOSDH email list aware of what the Scripps and WHOI glider
groups are contributing and what experience we have had in the Gulf of Mexico and the Loop
Current. I hae been coordinating this effort with Dan Rudnick.
We operated a glider in the Loop Current and detached eddies in the eastern Gulf of Mexico for
approximately 2 years, with the recovery of the last glider this February. WHOI was primarily in
charge of the logistics and piloting of the glider. So we have extensive experience operating a
glider in the region. We worked with some private sector consultants to map out both the
position of the Loop Current, made cross-sections across the Loop Current, and made extensive
surveys of detached eddies to improve predictions of their extent and used this data to improve
initial conditions for modeling the evolution of the eddy.
Scripps is set to ship a Spray glider to Louisiana at the end of the week. Scripps and Woods
Hole will share in the logistical support, and I will take the lead in piloting the glider. This
glider will be equipped with a CTD, a CDOM fluorometer, and an ADCP. We expect to operate the
glider to 500 m depth.
New technical note on cleaning WETLabs instruments that have come in contact with crude oil – thanks to Ian Walsh.
Operating WET Labs instruments in oiled environments
Here’s the technical note distributed by WETLabs on crude oil detection using the ECO CDOM puck:
Crude Oil Client Advisory
Thanks to Ian Walsh for his additional comments on this subject:
John and Eric,
The R/V Pelican appears to have been very successful in mapping the
presumed oil plume with an ECO CDOM fluorometer, a C Star
transmissometer and a dissolved oxygen sensor. Steve Lohrenz can give
you the details (he's cc'd on one of the msgs in this string).
The Pelican profiles detected multiple plumes, so density variability
of the crude doesn't appear to be a detection parameter. What exact
components of the crude oil, or the crude oil and dispersant, the CDOM
fluorometer is detecting is still an open issue. In any event, as the
oil ages it's characteristics will change, including what other
particles it picks up and the microbial community that develops on it.
Within the deep plumes the oil should be dispersed in droplets. Vernon
Asper described them as looking like marine snow aggregates. Flow
dynamics should minimize the likelihood of impact and as they age
they should become less sticky. I didn't get any reports from the
Pelican that they had to clean the instruments and they were both
profiling and towing. They did report that they stayed below 5 m depth
during the towing.
Here's what I've been passing out on this issue:
If oil gets on the sensor it will impact the measurement and will
need to be cleaned off. For the ECO's that is a fairly easy procedure.
Crude oil on the sensor should not be harmful to the ECO.
1) Remove as much oil as possible with soft towels or kimwipes.
2) Clean with warm water and detergent (Dawn works for birds, so I'd use that)
3) If there is 'tar' that resists removal then put some vegetable oil
on the tar and allow it to soften for a few minutes then repeat 1 and
For the most part, I don't think there will be much fouling of the
instruments in-situ unless they contact the surface slick. Subsurface
the oil will tend to be dispersed in balls which will have some
stickiness but not the coating properties of fresh oil.
So, deploy away from the surface slick, avoid coming within the top
few meters, and if possible give the glider a waypoint away from the
surface slick to aim for to call home.
John, I'll let you describe how the glider operates with respect to
depth and data reporting.
Both of you please feel free to call my cell phone.
I'm on Pacific Time, but don't get to bed till late (2300) and am up
by 0700 (I'm up earlier, but I'll be more intelligible after 0700).
Thanks and standing by,