Deployment 2009 to 2010:
Bottom Pressure Recorder "SBE53"

plot curtesy of Rick Krishfield

Deployment summary: Duration: Aug 5, 2009 to Sept 13, 2010     however, the sensor stopped prematurely on May 11 due to low power Location: 71 23.627 N, 152 3.820 W Variables measured: pressure, temperature Sensor information: SBE 53 BPR V 1.1e serial number 7;     quartz pressure sensor: serial number = 95148, range = 6000 psia;     external temperature sensor; Instrument settings: sampling interval 15 minutes, duration 120 seconds Calibration:Rick Krishfield periodically returns the unit to SeaBird for laboratory calibrations ;     prior to deployment, temperature was last calibrated on March 1, 2009;     pressure was last calibrated on Oct 10, 2004 Processed data: contained in the ASCII file bs0910_bpr.dat provided by Rick Krishfield.

Instrument setup and recovery: The instrument was checked out in Rick Krishfield's lab by Rick and Frank in May of 2009 prior to shipment. This being my first deployment, we took some time to run a test deployment; communications with the instrument were captured in a log file. Notes in my cruise log text file from the 2009 cruise indicated that I installed new batteries during the instrument startup. The mooring was recovered on Sept. 13, 2010. On the 16th, I connected to the SBE53 using a standard terminal emulator (PROCOMM; log file attached). This session indicated that the instrument had shut down prematurely due to low power. A clock check indicated the instrument clock to be 36 seconds fast.      GMT: Sept 16, 02:09:23      SBE53: Sept 16, 02:09:59 Data processing: The data was post-processed by Rick Krishfield back at WHOI. This included subtracting surface pressure, determined to be 10.1198 dbar by averaging the last hour of on-deck time prior to the obvious pressure increase during descent to depth on deployment. In addition, the frequency counter that collects output of the pressure sensor was corrected for drift.