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Global POC Synthesis from Beam Attenuation Data collected during JGOFS, WOCE and other programs

Global POC Synthesis from Beam Attenuation Data collected during JGOFS, WOCE and other programs. A.V. Mishonov, W.D. Gardner, & M.J. Richardson Department of Oceanography Texas A & M University College Station. Background.

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Global POC Synthesis from Beam Attenuation Data collected during JGOFS, WOCE and other programs

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  1. Global POC Synthesis from Beam Attenuation Datacollected during JGOFS, WOCE and other programs A.V. Mishonov, W.D. Gardner, & M.J. Richardson Department of Oceanography Texas A & M University College Station

  2. Background One of the major goals of JGOFS is to develop regional and global mass balances for carbon. Selected areas were studied through shipboard sampling during JGOFS in the last 15 years. To extend global coverage, the marine carbon dioxide survey was integrated with WOCE. SMP meeting, WH-2000

  3. Introduction To obtain information about POC distribution it is possible to use in-situ optical instruments - e.g. transmissometer and convert beam attenuation to POC. In order to extend our data coverage to a global level, we convinced many WOCE scientists to interface our transmissometers on their WOCE cruises during the last decade. We now have an opportunity to reduce & synthesize the data collected. SMP meeting, WH-2000

  4. Objectives • Reduce and quality control the transmissometer data from 17 WOCE cruises, providing accessibility and compatibility with JGOFS data for input to models of carbon cycling, aggregation / disaggregation, etc. • Establish new ocean- or region-specific algorithms to estimate global POC standing stock in the surface ocean from satellite back-scatter data and our transmissometer data sets. • Explore whether the relationship between CO2 drawdown and POC concentration can be used to estimate POC export from surface waters. SMP meeting, WH-2000

  5. Data Set Transmissometer data have been collected using instruments provided by our group over the last decade in collaboration with WOCE, JGOFS, and other large-scale hydrographic programs. These data include basin-wide transects in the North and South Atlantic, North and South Pacific, Indian, and Southern Oceans. We have been funded to analyze these data and convert the beam attenuation values to POC using the Beam Attenuation:POC relationships derived by our group during JGOFS Process studies. SMP meeting, WH-2000

  6. JGOFS WOCE Others Station Coverage: WOCE, JGOFS & others SMP meeting, WH-2000

  7. Available Transmissometer Data: • 19 WOCE cruises (Jan.1990 - Jun.1997), which includes: • 2231/2239 Sts/Casts; • More data will be included from: • JGOFS: 22 cruises, 410/1568 Sts/Casts • SAVE, WBEX, MCTT, etc: 9 cruises, 600 Sts (est.) • Possible future additions: • BATS & HOT: TBA • other archives (BOFS, NIOP, etc.): TBA SMP meeting, WH-2000

  8. Global Transmissometer Data Stations per Year Distribution SMP meeting, WH-2000

  9. Global Transmissometer Data Stations per Month Distribution SMP meeting, WH-2000

  10. WOCE Cruises (19) SMP meeting, WH-2000

  11. WOCE Stations Stations WOCE Lines SMP meeting, WH-2000

  12. JGOFS Cruises (22) SMP meeting, WH-2000

  13. JGOFS Stations Stations JGOFS Cruises SMP meeting, WH-2000

  14. Other Cruises (9) SMP meeting, WH-2000

  15. Other Stations Stations Other Programs SMP meeting, WH-2000

  16. Data Inventory Sample Sections SMP meeting, WH-2000

  17. Pacific Ocean SectionRV Th.Thompson, Jul-Aug. 93, Line p14n North Beam Attenuation Depth, m Distance, nm SMP meeting, WH-2000

  18. 0 -1000 -2000 -3000 Depth, m -4000 Beam Attenuation -5000 Distance, nm -6000 0.38 0.4 0.42 0.44 0.46 0.48 0.5 0.52 0.54 0.56 0 500 1000 1500 2000 2500 3000 Indian Ocean Section RV Knorr, Feb. 95, Line i09s SMP meeting, WH-2000

  19. Future steps 1 Transmissometer database: • Process 19 WOCE cruises of transmissometer data; • Add processed transmissometer & POC data from 22 JGOFS cruises; • Add processed transmissometer data from other basin-scale cruises where we have data (9+). SMP meeting, WH-2000

  20. Future steps 2 Beam attenuation / POC relationship: • Use algorithms developed during JGOFS: NABE, Arabian Sea, and Ross Sea/Antarctic Polar Front Zone expeditions; • convert Beam Attenuation to POC & quantify spatial and temporal distribution. SMP meeting, WH-2000

  21. Cp, m-1 RS: y=0.0178x - 0.0155R2=0.874 NABE: y=0.0376x - 0.0032R2=0.913 APFZ: y=0.0264x - 0.0649R2=0.982 POC, mM C/L JGOFS: Beam Cp versus POC SMP meeting, WH-2000

  22. Thank You! SMP meeting, WH-2000

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