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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? - PowerPoint PPT Presentation
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Seagrass and Seagrass and MermaidsMermaids
Heidi Dierssen, Univ. CT Heidi Dierssen, Univ. CT
Richard Zimmerman, Old DominionRichard Zimmerman, Old Dominion
Biogeochemical QuestionsBiogeochemical 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?
Moving Beyond QualitativeMoving 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
Comparing two sitesComparing two sites• 1) Bahamas Banks
– Little anthropogenic influence– ~Constant water column IOPs
– Primarily ag, whitings
• 2) Florida Bay– Anthropogenic disturbance– CDOM, sediment, and phytoplankton
Seafloor MeasurementsSeafloor Measurements• Bottom reflectance
– DOBBS
• Seagrass quadrats• Seagrass primary productivity• Digital camera/strobe• Sediment cores
– Reflectance– Particle size spectrum– Chl, PP
• Seagrass blades– Morphometrics– Reflectance
Water columnWater 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
Sea surface interfaceSea surface interface• Remote sensing reflectance
– HyperPro– Analytical Spectral Devices (ASD)
• Data available at: http://colors.uconn.edu
Intensive Field workIntensive Field work
Field WorkField Work14
15 1310
982
1
36
4 5
7
12
11
24 ft. boat24 ft. boat
Jan 2006
10 km
Spatial ScalesSpatial Scales
Florida St. Joseph BayFlorida St. Joseph Bay
5 km 0.5 km
60 m
Spectral InformationSpectral Information• Leaf-level
Spectral InformationSpectral Information• Canopy-level effect
Fate of productionFate of production• Carbonate dissolution
– Assumes seagrass leaves decompose in sediments
– 2% of annual oceanic CO2 uptake
• Export biomass
FL Bay Syringodium Export Carbon out of system
Lesson 5: Avoid hurricane Lesson 5: Avoid hurricane seasonseason
Post-Hurricane Wilma 2005
Jan 2006
Atmospheric CorrectionAtmospheric Correction400 500 600 7000
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Station 1
400 500 600 7000
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Station 2
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Station 3
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Station 4
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Station 5
400 500 600 7000
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Station 6
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Station 7
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Station 9
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Station 10
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Station 11
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Station 12
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Station 13
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Station 14
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Station 15
Wavelength (nm)
Rrs
(sr-1
)
Atmospheric Correction
Current CollaboratorsCurrent 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
