Glider Bob decided to spring a leak late Friday (05/22) night. Is there any better timing than that? To make matters worse, Glider Bob was about as far offshore as possible with the prevailing currents pushing him offshore and to the south (cyan track).
Fortunately, Justin was out on the Wecoma and they were able to recover bob early, early Sunday morning without much apparent hassle. We’ll have to talk to Justin to find out for sure. I monitored the recover via glider terminal and the Wecoma’s webcam, while I fed Dashel a bottle around 2am.
Laura left bright and early Tuesday morning on the Elakha to retreive bob from the Wecoma, her report: The transfer went well. Glider and cart were tied to a line and dropped in the water from the Wecoma, and we winched it on board the Elakha. We lucked out with the weather, and as far as I could tell Bob did not hit either of the two ships.
Now we’re waiting to hear from Anatoli just how much water is inside …
Courtesy of our fearless photographer David Reinert, here’s a Slocum glider being launched off of Concepcion, Chile a couple of weeks ago.
Now, that’s a small boat!
At the beginning of April, we had some extended 20 kt bursts of northerly winds off the Oregon shelf,
(image from www.orcoos.org)
and the glider observations show the upwelling response in the coasatal ocean with deep, cool, salty, low oxygen water moving up onto the shelf.
In addition, to the deep water moving up onto the shelf, the fresh water in the surface layer moves off the shelf, and phytoplankton blooms can be seen in the near surface chlorophyll fluorescence measurements. Compare these sections with the clasic winter conditions below.
Here’s the first section from Glider Bob’s Oregon shelf mission. This is our fourth season of making Oregon shelf observations. During the winter, the surface layer is typically well-mixed down to 80 m, the pycnocline slopes downward toward the coast intersecting the bottom near the shelfbreak, and there is a small lense of fresh water very near shore from rain and run-off from small local rivers, and the currents are relatively strong and to the north. In this section, there is also a slight run up the shelf along the bottom of salty dense water, lead by some small scale variability that looks reminiscent of nonlinear internal waves a la the observations by Klymak and Moum (2004).