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

SVP-Barometer Drifter Performance

• 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

SVP-Barometer Drifter Performance

Principal Products

ArgoDrifter (also know as CODE, Davis or Sculp)

SVP-Barometer Drifter Performance

Principal Products

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

SVP-Barometer Drifter Performance

Principal Products

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

SVP-Barometer Drifter Performance

• 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

SVP-Barometer Drifter Performance

Argos 25755

-Deployed March ‘01

-Recovered in the Falklands in May ‘03

SVP-Barometer Drifter Performance

The “Beach”!

SVP-Barometer Drifter Performance

• 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)

SVP-Barometer Drifter Performance

GDP Database

SVP-Barometer Drifter Performance

Meteo France GTS Statistics Archive

SVP-Barometer Drifter Performance

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

SVP-Barometer Drifter Performance

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

SVP-Barometer Drifter Performance

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

SVP-Barometer Drifter Performance

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

SVP-Barometer Drifter Performance

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

SVP-Barometer Drifter Performance

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

SVP-Barometer Drifter Performance

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

SVP-Barometer Drifter Performance

• 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)

SVP-Barometer Drifter Performance

*from pre-2001 to post-2000 buoys

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

SVP-Barometer Drifter Performance

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

SVP-Barometer Drifter Performance

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

SVP-Barometer Drifter Performance

• 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