NHEP TAC December 7 2007 Preliminary results from light attenuation sensors on the Great Bay buoy and hyper-spectral imagery of Great Bay Ru Morrison,

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Presentation transcript:

NHEP TAC December Preliminary results from light attenuation sensors on the Great Bay buoy and hyper-spectral imagery of Great Bay Ru Morrison, UNH Phil Trowbridge, NH DES Tom Gregory, UNH Mike Novak, UNH

NHEP TAC December

NHEP TAC December

NHEP TAC December Great Bay Coastal Buoy Climatology Visualization Discharge ft 3 /s Salinity (psu) Plots available real time at buoys/great_bay/

NHEP TAC December Univariate Regression of Kd vs. Water Quality Parameters Kd vs Chlorophyll-aKd vs TSSKd vs Salinity (CDOM) N = 184 R 2 = 0.07 N = 176 R 2 = 0.13 N = 209 R 2 = 0.54 Phil Trowbridge, NHDES

NHEP TAC December Multivariate Regression of Kd vs. Water Quality Parameters Multivariate Regression of Kd vs. TSS, Chla, and Salinity (CDOM) TSS and Salinity are significant, R 2 = 0.61, n=176 Phil Trowbridge, NHDES

NHEP TAC December Buoy Light Attenuation Measurements Surface Irradiance (Hyperspectral 350 nm – 800 nm)Surface Irradiance (Hyperspectral 350 nm – 800 nm) Subsurface Irradiance (1.1 m)Subsurface Irradiance (1.1 m) FLNTUS – Chlorophyll and TurbidityFLNTUS – Chlorophyll and Turbidity FLCDS – CDOMFLCDS – CDOM And much more……

NHEP TAC December Over 9000 data points so to this year

NHEP TAC December Kd(PAR) = CDOM Chl NTUS r 2 = 0.94, N=3371 Provisional Buoy relationship –PAR

NHEP TAC December Buoy – Spectral Attenuation Gallegos, 2001

NHEP TAC December Contributions to K d (PAR)

NHEP TAC December Turbidity = 10 ( Wind Salinity) r 2 = 0.75, N=207 Sources of Variability - turbidity

NHEP TAC December Sources of Variability - CDOM

NHEP TAC December Sources of variability - chlorophyll Chlorophyll-a (mg / m 3 ) Nitrate (µmol / L)

NHEP TAC December

NHEP TAC December Sources of variability - chlorophyll NO 3 = Chl-a r 2 = 0.90, N = 69

NHEP TAC December Spatial variability EPA grant with NHEPEPA grant with NHEP Expand results from Great Bay Buoy with hyperspectral imageryExpand results from Great Bay Buoy with hyperspectral imagery SpecTIR collected imagery (2 flights between end of July and end of October)SpecTIR collected imagery (2 flights between end of July and end of October) Grab samples and spatial survey underneath with multiple partnersGrab samples and spatial survey underneath with multiple partners

NHEP TAC December Flow thru data

NHEP TAC December

NHEP TAC December

NHEP TAC December

NHEP TAC December How much light does eelgrass need? Median survival depth = 1.72 m Median K d (PAR) = 0.88 m -1 Median survival depth = 2.31 m

NHEP TAC December Acknowledgements Thanks to: –All those who collected the historical data –Dave Shay and the faculty and staff of Jackson Estuarine Laboratory –Chris Hunt and Shawn Shelito for help with the flow through measurements –The captain and crew of the R/V Gulf Challenger –Rich Lagan and Jon Pennock, University of New Hampshire –Darrell Adams, Cyril Dempsey, and all at Satlantic Inc. –Andrew Barnard, Ian Walsh, Alex Derr, Ron Zaneveld and all at WET Labs, Inc. –NOAA for the funding –NHEP and NHDES