svp-barometer drifter performance jeffrey wingenroth vp and general manager technocean, inc. cape...

SVP-Barometer Drifter Performance

Jeffrey WingenrothVP and General Manager

Technocean, Inc.Cape Coral, Florida

USA

www.technocean.com


• One of the first manufacturers of satellite-tracked Lagrangian drifting buoys (began in 1983)

Technocean, Inc.

• Early participant in the construction of SVP and SVP-B drifters

• Currently involved in the design and construction of various drifting buoy types integrating environmental sensors and GPS with Argos

Drogue Delivery

GPS ArgoDrifter


Principal Products

ArgoDrifter (also know as CODE, Davis or Sculp)


Principal Products

Argos Beacons (for moored buoys, SUBS floats, and other)


Principal Products

SVP and SVP-B Buoys (including the “Mini” drogue)


• Evaluate historical SVP longevity

• Evaluate SVP-Barometer longevity (in terms of AP data on GTS)

• Observe SVP-Barometer AP data quality (in terms of RMS from GTS statistics)

• Compare Technocean and other commercial SVP-Bs

Study Objectives


Argos 25755

-Deployed March ‘01

-Recovered in the Falklands in May ‘03


The “Beach”!


• Global Drifter Center Database

provides deployment information, type of death, end date, etc.

http://www.aoml.noaa.gov/phod/dac/dirall.html (thanks AOML!)

• Buoy-QC Statistics Archive

Provides AP data statistics including RMS values, etc. Enables a

determination of when buoy is put on/taken off GTS

ftp://ftp.shom.fr/pub/meteo/qc-stats (thanks Meteo-France!)

Data Sources(publicly available websites)


GDP Database


Meteo France GTS Statistics Archive


Historical Perspective - Percent Operational After Months Deployed(for ALL buoys in database deployed before 2001)

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

1 3 6 9 12 15 18 21 24 27 30

Months

Before 2001 Operational Before 2001 Aground


Historical Perspective - Percent Operational After Months Deployed(for ALL buoys in database deployed after 2000)

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

1 3 6 9 12 15 18 21 24 27 30

Months

Since 2000 Operational Since 2000 Aground


Historical Perspective - Percent Improvement(Between All pre-2001 and post-2000 buoys)

0%

5%

10%

15%

20%

25%

30%

35%

40%

45%

50%

1 3 6 9 12 15 18 21 24 27 30

Months

Improvement


Percent Operational and Grounded (or picked up) After Months Deployed(for ALL SVP deployed after 2000)


Percent Operational After Months Deployed(for ALL SVP deployed after 2000)


Performance Improvement -- Percent Operational After Months Deployed (for ALL SVP by Era)

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

1 3 6 9 12 15 18 21 24 27 30

Months

Technocean 2001-Pres.

Technocean Pre-2001

Other Manuf. 2001-Pres.

Other Manuf. Pre-2001


Performance Improvement -- Percent Increase Operational After Months Deployed (for ALL SVP by Era)

-100%

-80%

-60%

-40%

-20%

0%

20%

40%

60%

80%

1 3 6 9 12 15 18 21 24 27 30

Months

Technocean

Other Manufacturers

*from pre-2001 to post-2000 buoys


• Groundings

• Buoy Damage resulting from Shipment or Deployment

• Sensor or Port Failure

• Manufacturing Defect

• Unknown (human activity, ice, ?????)

Primary Reasons Buoy AP Data Are Removed from GTS

(or never placed on after buoy deployment)


*from pre-2001 to post-2000 buoys

Percent on GTS After Months Deployed(for SVP-B deployed after 2000)


Technocean AP Data Quality - Average Monthly RMS values(for Technocean SVP-Bs deployed after 2000)

0.0

1.0

2.0

3.0

4.0

5.0

Average Monthly RMS


Technocean AP Data Quality - Average Monthly RMS values(for Technocean SVP-Bs deployed after 2000)

0.0

1.0

2.0

3.0

4.0

5.0

0 12 24 36Month

Average Monthly RMS

Fitted Plot


• For all SVPs, operating life has improved ≈15% to 30% between older and newer generations of buoys (for 12 and 24-month periods, respectively) while buoy costs have come down significantly

• Technocean buoys operated significantly longer than other manufacturers translating to a lower cost per unit of data

• Technocean has improved buoy performance over time

• Technocean SVP-Bs stay on the GTS longer

• Since 2000, Technocean AP data quality has been consistent

Summary

svp-barometer drifter performance jeffrey wingenroth vp and general manager technocean, inc. cape...

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