Abstract

The deployment of towed depth-profiling paravane systems and autonomous gliders is providing a wealth of high-resolution oceanographic datasets. These datasets are, however, over-sampled in space and time. This paper describes a data-adaptive, user-configurable method that has been used to significantly reduce the time/space density of such data without compromising the inherent scientific information that they provide. The method involves sub-sampling at fixed space and time intervals with additional samples being kept given either a significant change (1) in the depth extent of the alongtrack profiles, or (2) in the values of the profiles themselves. An example is provided showing how well the algorithm works on nearly 5,000 chlorophyll fluorescence profiles collected off the coast of Australia.

© 2008 Optical Society of America

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References

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  1. D. Olbers, Ocean Waves Volume 3: Oceanography, J. Siindermann, ed., (Springer-Verlag, 1986). Vol. 3, Chap. 6.
  2. R. E. Thomson, S. E. Roth, and J. Dymond, "Near-inertial motions over a mid-ocean ridge; effects of topography and hydrothermal plumes," J. Geophys. Res. 95, 7261-7278 (1990).
    [CrossRef]
  3. J. Dunning and L. Huttchings, "TUORs for marine monitoring," International Ocean Systems, November/December 2005. http://www.chelsea.co.uk/Technical%20Papers/SA%20Nushuttle%20article%20TP11%2012.pdf.
  4. E. Keegan, "Aquashuttle monitors Exxon Valdez oil spill," Spill Science & Technology Bulletin 2, 87-88 (1995).
    [CrossRef]
  5. R. Burt, "The growth in towed undulating vehicles for oceanographic data gathering," in Oceans 2000 MTS/IEEE 0-7803-6551-8 and 0-7803-6552, Volume 1, Providence, RI, Sept 11, 2000 (IEEE, New York, 2000) 641-645.
  6. K. H. Brink, F. Bahr, R. K. Shearman, "Alongshore currents and mesoscale variability near the shelf edge off northwestern Australia," J. Geophys. Res. 112, C05013, doi:10.1029/2006JC003725 (2007).
    [CrossRef]
  7. O. Schofield, J. Kohut, D. Aragon. L. Creed, J. Graver, C. Haldeman, J. Kerfoot, H. Roarty, C. Jones, D. Webb, S. Glenn "Slocum gliders: robust and ready,"J. Field Robotics 24, 1-13 (2007).
    [CrossRef]
  8. K. Barrett and J. Smart, "Sub-sampling software for environmental profile data," The Johns Hopkins University APL Internal Memorandum STF-06-095, 30 June 2006.

2007 (2)

K. H. Brink, F. Bahr, R. K. Shearman, "Alongshore currents and mesoscale variability near the shelf edge off northwestern Australia," J. Geophys. Res. 112, C05013, doi:10.1029/2006JC003725 (2007).
[CrossRef]

O. Schofield, J. Kohut, D. Aragon. L. Creed, J. Graver, C. Haldeman, J. Kerfoot, H. Roarty, C. Jones, D. Webb, S. Glenn "Slocum gliders: robust and ready,"J. Field Robotics 24, 1-13 (2007).
[CrossRef]

1995 (1)

E. Keegan, "Aquashuttle monitors Exxon Valdez oil spill," Spill Science & Technology Bulletin 2, 87-88 (1995).
[CrossRef]

1990 (1)

R. E. Thomson, S. E. Roth, and J. Dymond, "Near-inertial motions over a mid-ocean ridge; effects of topography and hydrothermal plumes," J. Geophys. Res. 95, 7261-7278 (1990).
[CrossRef]

Aragon, D.

O. Schofield, J. Kohut, D. Aragon. L. Creed, J. Graver, C. Haldeman, J. Kerfoot, H. Roarty, C. Jones, D. Webb, S. Glenn "Slocum gliders: robust and ready,"J. Field Robotics 24, 1-13 (2007).
[CrossRef]

Bahr, F.

K. H. Brink, F. Bahr, R. K. Shearman, "Alongshore currents and mesoscale variability near the shelf edge off northwestern Australia," J. Geophys. Res. 112, C05013, doi:10.1029/2006JC003725 (2007).
[CrossRef]

Barrett, K.

K. Barrett and J. Smart, "Sub-sampling software for environmental profile data," The Johns Hopkins University APL Internal Memorandum STF-06-095, 30 June 2006.

Brink, K. H.

K. H. Brink, F. Bahr, R. K. Shearman, "Alongshore currents and mesoscale variability near the shelf edge off northwestern Australia," J. Geophys. Res. 112, C05013, doi:10.1029/2006JC003725 (2007).
[CrossRef]

Dymond, J.

R. E. Thomson, S. E. Roth, and J. Dymond, "Near-inertial motions over a mid-ocean ridge; effects of topography and hydrothermal plumes," J. Geophys. Res. 95, 7261-7278 (1990).
[CrossRef]

Keegan, E.

E. Keegan, "Aquashuttle monitors Exxon Valdez oil spill," Spill Science & Technology Bulletin 2, 87-88 (1995).
[CrossRef]

Kohut, J.

O. Schofield, J. Kohut, D. Aragon. L. Creed, J. Graver, C. Haldeman, J. Kerfoot, H. Roarty, C. Jones, D. Webb, S. Glenn "Slocum gliders: robust and ready,"J. Field Robotics 24, 1-13 (2007).
[CrossRef]

Roth, S. E.

R. E. Thomson, S. E. Roth, and J. Dymond, "Near-inertial motions over a mid-ocean ridge; effects of topography and hydrothermal plumes," J. Geophys. Res. 95, 7261-7278 (1990).
[CrossRef]

Schofield, O.

O. Schofield, J. Kohut, D. Aragon. L. Creed, J. Graver, C. Haldeman, J. Kerfoot, H. Roarty, C. Jones, D. Webb, S. Glenn "Slocum gliders: robust and ready,"J. Field Robotics 24, 1-13 (2007).
[CrossRef]

Shearman, R. K.

K. H. Brink, F. Bahr, R. K. Shearman, "Alongshore currents and mesoscale variability near the shelf edge off northwestern Australia," J. Geophys. Res. 112, C05013, doi:10.1029/2006JC003725 (2007).
[CrossRef]

Smart, J.

K. Barrett and J. Smart, "Sub-sampling software for environmental profile data," The Johns Hopkins University APL Internal Memorandum STF-06-095, 30 June 2006.

Thomson, R. E.

R. E. Thomson, S. E. Roth, and J. Dymond, "Near-inertial motions over a mid-ocean ridge; effects of topography and hydrothermal plumes," J. Geophys. Res. 95, 7261-7278 (1990).
[CrossRef]

J. Field Robotics (1)

O. Schofield, J. Kohut, D. Aragon. L. Creed, J. Graver, C. Haldeman, J. Kerfoot, H. Roarty, C. Jones, D. Webb, S. Glenn "Slocum gliders: robust and ready,"J. Field Robotics 24, 1-13 (2007).
[CrossRef]

J. Geophys. Res. (2)

K. H. Brink, F. Bahr, R. K. Shearman, "Alongshore currents and mesoscale variability near the shelf edge off northwestern Australia," J. Geophys. Res. 112, C05013, doi:10.1029/2006JC003725 (2007).
[CrossRef]

R. E. Thomson, S. E. Roth, and J. Dymond, "Near-inertial motions over a mid-ocean ridge; effects of topography and hydrothermal plumes," J. Geophys. Res. 95, 7261-7278 (1990).
[CrossRef]

Spill Science & Technology Bulletin (1)

E. Keegan, "Aquashuttle monitors Exxon Valdez oil spill," Spill Science & Technology Bulletin 2, 87-88 (1995).
[CrossRef]

Other (4)

R. Burt, "The growth in towed undulating vehicles for oceanographic data gathering," in Oceans 2000 MTS/IEEE 0-7803-6551-8 and 0-7803-6552, Volume 1, Providence, RI, Sept 11, 2000 (IEEE, New York, 2000) 641-645.

J. Dunning and L. Huttchings, "TUORs for marine monitoring," International Ocean Systems, November/December 2005. http://www.chelsea.co.uk/Technical%20Papers/SA%20Nushuttle%20article%20TP11%2012.pdf.

D. Olbers, Ocean Waves Volume 3: Oceanography, J. Siindermann, ed., (Springer-Verlag, 1986). Vol. 3, Chap. 6.

K. Barrett and J. Smart, "Sub-sampling software for environmental profile data," The Johns Hopkins University APL Internal Memorandum STF-06-095, 30 June 2006.

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Figures (4)

Fig. 1.
Fig. 1.

Dataset prior to thinning: 179 total absorption (“AT”) profiles.

Fig. 2.
Fig. 2.

Dataset after thinning: 50 total absorption (“AT”) profiles.

Fig. 3.
Fig. 3.

Map of thinned data (red) vs. un-thinned data (blue) off the coast of Australia.

Fig. 4.
Fig. 4.

Chlorophyll fluorescence depth profiles of thinned data (red) vs. un-thinned data (black) off the coast of Australia (locations are shown in Fig. 3).

Tables (3)

Tables Icon

Table 1. Nominal Change Criteria Used to Thin Vertical Profile Data

Tables Icon

Table 2. Sample Input File for the SUBSMP4 Executable Data-Thinning Program

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Table 3. SBS test fiber and coupling characteristics

Equations (2)

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Z1=mean_percent_change=100%*1Ni=1N(yiyrefi)yrefi
Z2=mean_change=1Ni=1N(yiyrefi)

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