nhep tac december 7 2007 preliminary results from light attenuation sensors on the great bay buoy...
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![Page 1: 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,](https://reader035.vdocuments.site/reader035/viewer/2022062806/56649ccc5503460f94995deb/html5/thumbnails/1.jpg)
UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Preliminary results from Preliminary results from light attenuation sensors on light attenuation sensors on the Great Bay buoy and the Great Bay buoy and hyper-spectral imagery of hyper-spectral imagery of Great Bay Great Bay
Ru Morrison, UNHRu Morrison, UNHPhil Trowbridge, NH DESPhil Trowbridge, NH DESTom Gregory, UNHTom Gregory, UNHMike Novak, UNHMike Novak, UNH
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
![Page 3: 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,](https://reader035.vdocuments.site/reader035/viewer/2022062806/56649ccc5503460f94995deb/html5/thumbnails/3.jpg)
UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Great Bay Coastal Buoy Climatology Visualization
2006 2007
Dis
char
ge f
t3 /s
Sal
inity
(ps
u)
Plots available real time at http://www.cooa.unh.edu/data/buoys/great_bay/
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Univariate Regression of Kd vs. Univariate Regression of Kd vs. Water Quality ParametersWater Quality Parameters
0 10 20 30 40 50CHLA
0
1
2
3
4
LA
C_
PO
S
0 10 20 30 40 50 60 70TSS
0
1
2
3
4
LAC
_PO
S
0 10 20 30 40SAL
0
1
2
3
4
LAC
_PO
S
Kd vs Chlorophyll-a Kd vs TSS Kd vs Salinity (CDOM)
N = 184R2 = 0.07
N = 176R2 = 0.13
N = 209R2 = 0.54
Phil Trowbridge, NHDES
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Multivariate Regression of Kd vs. Multivariate Regression of Kd vs. Water Quality ParametersWater Quality Parameters
0 10 20 30 40SAL
0
10
20
30
40
50
60
70
TS
S
1
2 2
3
4
0 10 20 30 40SAL
0
10
20
30
40
50
60
70
TS
S
01234
LAC_POS
Multivariate Regression of Kd vs. TSS, Chla, and Salinity (CDOM)TSS and Salinity are significant, R2 = 0.61, n=176
Phil Trowbridge, NHDES
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Buoy Light Attenuation Buoy Light Attenuation MeasurementsMeasurements
• Surface Irradiance (Hyperspectral 350 Surface Irradiance (Hyperspectral 350 nm – 800 nm)nm – 800 nm)
• Subsurface Irradiance (1.1 m)Subsurface Irradiance (1.1 m)• FLNTUS FLNTUS – Chlorophyll and Turbidity– Chlorophyll and Turbidity• FLCDS FLCDS – CDOM– CDOM
And much more……
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Over 9000 data points so to this year
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Kd(PAR) = 0.3561 + 0.0083.CDOM + 0.0152.Chl + 0.0737.NTUS
r2 = 0.94, N=3371
Provisional Buoy relationship –PARProvisional Buoy relationship –PAR
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Buoy – Spectral AttenuationBuoy – Spectral AttenuationGallegos, 2001
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Contributions Contributions to to KKdd(PAR)(PAR)
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Turbidity = 10(1.03 + 0.087.Wind - 0.041.Salinity)
r2 = 0.75, N=207
Sources of Variability - turbiditySources of Variability - turbidity
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Sources of Variability - CDOMSources of Variability - CDOM
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Sources of variability - chlorophyllSources of variability - chlorophyll
Chlorophyll-a (mg / m3)
Nitr
ate
(µm
ol /
L)
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Sources of variability - chlorophyllSources of variability - chlorophyll
NO3 = 19.0 - 1.59.Chl-a
r2 = 0.90, N = 69
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Spatial Spatial variabilityvariability
• EPA grant with NHEPEPA grant with NHEP• Expand results from Expand results from
Great Bay Buoy with Great Bay Buoy with hyperspectral imageryhyperspectral imagery
• SpecTIR collected SpecTIR collected imagery (2 flights imagery (2 flights between end of July and between end of July and end of October)end of October)
• Grab samples and spatial Grab samples and spatial survey underneath with survey underneath with multiple partnersmultiple partners
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
Flow thru dataFlow thru data
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
How much light does eelgrass How much light does eelgrass need?need?
Median survival depth = 1.72 m
Median Kd(PAR) = 0.88 m-1
Median survival depth = 2.31 m
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UNH Coastal Observing CenterUNH Coastal Observing CenterNHEP TAC December 7 2007
AcknowledgementsAcknowledgements
Thanks to:Thanks to:
– All those who collected the historical dataAll those who collected the historical data– Dave Shay and the faculty and staff of Jackson Estuarine LaboratoryDave Shay and the faculty and staff of Jackson Estuarine Laboratory– Chris Hunt and Shawn Shelito for help with the flow through measurementsChris Hunt and Shawn Shelito for help with the flow through measurements– The captain and crew of the R/V Gulf ChallengerThe captain and crew of the R/V Gulf Challenger– Rich Lagan and Jon Pennock, University of New HampshireRich Lagan and Jon Pennock, University of New Hampshire– Darrell Adams, Cyril Dempsey, and all at Satlantic Inc.Darrell Adams, Cyril Dempsey, and all at Satlantic Inc.– Andrew Barnard, Ian Walsh, Alex Derr, Ron Zaneveld and all at WET Labs, Inc.Andrew Barnard, Ian Walsh, Alex Derr, Ron Zaneveld and all at WET Labs, Inc.– NOAA for the fundingNOAA for the funding– NHEP and NHDESNHEP and NHDES