RU27…a book in her own.

This week, Team Google Earth completed reading and summarizing the seemingly-endless the scientist's blog for RU27 to identify specific events to map out along the glider's vertical flight path, including dive depths, angles, and bio blips. Some examples of these progressive events include:

May 2, 2009: RU27 leaves the continental shelf and heads into deeper water. The dive depth was increased to 140 meters at first, and then eventually 180 meters, with the climb-to depth being set at 40 meters.

May 12, 2009: RU27's deflection depth was rasied to 20 meters.

June 17, 2009: RU27 was increased to full speed, by increasing the buoyancy pump from 90% to its full range, and by increasing the dive and climb angles from 26 degrees to 35 degrees. This enabled the glider to fly out of a cyclonic eddy.

June 29, 2009: The dive and climb angles were changed to 35 degrees again, which increased velocity in order to get through a strong current.

August 11: Buoyancy pump and dive depths - the glider dive angle was changed to 36 degrees, and the depth of the top inflection was changed to 35 meters from 30 meters because 40 meters was too low. The thermocline during this time was at 40 meters, and when the glider went to this depth, the pressure was pushing the buoyancy pump in too quickly, which generated stray electricity, and caused the glider to shut down the pump to protect itself.

August 28: RU27 was ascending from 150 meters, and was held motionless at a depth of 73 meters for three minutes. This caused a reversal in direction, which pushed the pump in too quickly and caused an abort. This caused RU27 to come straight to the surface, and when she called in, there was no subsurface data, and she could not dive. She was set to drift for the night while the field crew slept. Divers eventually added 70 grams of lead to RU27 which enabled her to dive again.

Bio Blip compilation - YO Anomalies

First: June 3 - anomalies occurred between 40m and 100m.

Bio Blip June 3

Second: July 4 - anomalies occurred at 61.5m

Bio Blip 2

Third: July 7 - occurred anomalies between 60m and 130m

Bio Blip 3

These events will be formatted into two Google Earth .kmz's: (1) a pin-point collection of data for surface viewing, and (2) a subsurface vertical flight profile.

Data from ULPGC is helping a great deal with RU27's final weeks of her mission, as she needs to stay in a safe area away from heavy vessel traffic and southerly pushing currents. Not only are the 5 data types (CHL-A, SST, SSH, CURRENTS, EDGE SST) from ULPGC being formatted for Google Earth, but archived-to-realtime data is being animated for the potential to predict the movement of eddies and currents. The first of these is an animation of SSH (Sea Surface Height) to track the movement of eddies. The animation is from November 17, 2009 to November 22, 2009.


These animations differ from others in that they are a fade animation. While they are more time consuming and labor intensive to produce, they create a smooth-motion effect which enables the viewer to more easily follow movement over time.

-Dave, Chris, & Jason

Comments are closed.