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Seagrass and Mermaids

Seagrass and Mermaids. Heidi Dierssen, Univ. CT Richard Zimmerman, Old Dominion. Biogeochemical Questions. How much do the shallow carbonate sediment banks contribute to NPP? How do seagrasses on these banks influence the carbon cycle (carbonate dissolution) and heat budgets?

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Seagrass and Mermaids

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  1. Seagrass and Mermaids Heidi Dierssen, Univ. CT Richard Zimmerman, Old Dominion

  2. Biogeochemical Questions • How much do the shallow carbonate sediment banks contribute to NPP? • How do seagrasses on these banks influence the carbon cycle (carbonate dissolution) and heat budgets? • What are the mechanisms underlying seagrass distributions?

  3. Moving Beyond Qualitative • Qualitative maps • Presence or absence of benthos • %cover • Quantitative maps • Leaf area index (LAI) m2 m-2 • LAI or standing crop to NPP • LAI to Carbonate dissolution • Bottom albedo for heat budgets

  4. Comparing two sites • 1) Bahamas Banks • Little anthropogenic influence • ~Constant water column IOPs • Primarily ag, whitings • 2) Florida Bay • Anthropogenic disturbance • CDOM, sediment, and phytoplankton

  5. Seafloor Measurements • Bottom reflectance • DOBBS • Seagrass quadrats • Seagrass primary productivity • Digital camera/strobe • Sediment cores • Reflectance • Particle size spectrum • Chl, PP • Seagrass blades • Morphometrics • Reflectance

  6. Water column • ac-9 package, eco-VSF, CTD, fluorometers (Chl, CDOM, phycoer.) • Hydroscat 6 • LISST 100X, particle size analyzer • Irradiance • Planar, Ed (2 depths), Eu over substrate • Scalar Eod (2 depths), Eou • Filtered for TSM, Chl, CDOM

  7. Sea surface interface • Remote sensing reflectance • HyperPro • Analytical Spectral Devices (ASD) • Data available at: http://colors.uconn.edu

  8. Intensive Field work

  9. Field Work 14 15 13 10 9 8 7 2 3 6 12 1 4 5 11

  10. 24 ft. boat

  11. Spatial Scales Jan 2006 10 km

  12. Florida St. Joseph Bay 60 m 5 km 0.5 km

  13. Spectral Information • Leaf-level

  14. Spectral Information • Canopy-level effect

  15. Fate of production • Carbonate dissolution • Assumes seagrass leaves decompose in sediments • 2% of annual oceanic CO2 uptake • Export biomass

  16. FL Bay Syringodium Export Carbon out of system

  17. Lesson 5: Avoid hurricane season Post-Hurricane Wilma 2005

  18. Jan 2006

  19. Atmospheric Correction Atmospheric Correction

  20. Current Collaborators • Atmospheric Correction • TAFKAA model (Bo-Cai Gao) • Hyperspectral imagery, Paul Bissett FERI • Total suspended matter, GOBI Model, Mike Twardowski • Air-Sea CO2 Flux, Wade McGillis • Carbonate dissolution, David Burdige

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