ru morrison, unh phil trowbridge, nh des tom gregory, unh mike novak, unh

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


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/


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


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

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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


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……


Over 9000 data points so to this year


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


Buoy – Spectral AttenuationBuoy – Spectral AttenuationGallegos, 2001


Contributions Contributions to to KKdd(PAR)(PAR)


Turbidity = 10(1.03 + 0.087.Wind - 0.041.Salinity)

r2 = 0.75, N=207

Sources of Variability - turbiditySources of Variability - turbidity


Sources of Variability - CDOMSources of Variability - CDOM


Sources of variability - chlorophyllSources of variability - chlorophyll

Chlorophyll-a (mg / m3)

Nitr

ate

(µm

ol /

L)


Sources of variability - chlorophyllSources of variability - chlorophyll

NO3 = 19.0 - 1.59.Chl-a

r2 = 0.90, N = 69


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


Flow thru dataFlow thru data


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


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

ru morrison, unh phil trowbridge, nh des tom gregory, unh mike novak, unh

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