Sun Zenith Angle Effects on Rrs and Rho in Water Studies
Explore the impact of sun zenith angle variations on remote sensing reflectance (Rrs) and spectral reflectance (Rho) in water studies. Discover how Rrs changes with different sun zenith angles, affecting the viewing and scattering angles, and understand the spectral dependency of Rho at small zenith angles. Delve into phase functions, Arizona dust samples, VSF measurements, Mie theory predictions, and LISST data analysis. Unravel the complexities of scattering angles, phase functions, and comparing measured and predicted functions using advanced scientific techniques.
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Presentation Transcript
RrsDependence on Sun Zenith 3 5x 10 0 10 20 30 40 50 60 70 80 4.5 4 3.5 3 Rrs (sr 1) 2.5 2 1.5 1 0.5 0 350 400 450 500 550 600 650 700 750 Wavelength (nm) Rrs as seen from 40 , 135 viewing angle Small variations in Rrs with sun zenith angle (assume Rrs is calculated exactly..?)
Rrs Dependence on Sun Zenith 3 4.5x 10 4.45 4.4 Rrs at 540nm (sr 1) 4.35 4.3 4.25 4.2 0 10 20 30 Sun Zenith Angle (degrees) 40 50 60 70 80 The change in Rrs must be due to viewing the VSF at different angles drops off at >60 due to less light enter the water at high angles.
Rho Dependence on Sun Zenith 0.044 360nm 740nm 0.042 0.04 A rho of 0.28 appears to be a good approximation unless the sun is directly overhead. Rho also becomes spectrally dependent at small zenith angles. 0.038 0.036 Rho 0.034 0.032 0.03 0.028 0.026 0 10 20 30 40 50 60 70 80 90 Sun Zenith Angle (Degrees)
4 10 Arizona Dust Cheat DRE Plat Petzold Average 2 Phase Functions From Lab 4 10 Phase Function (sr 1) 0 10 2 10 4 10 1 0 1 2 10 10 10 10 Scattering Angle (Degrees) 4 10 Arizona Dust Cheat DRE Plat Petzold Average Arizona Dust 40-30 um Platymonas 16-30 um Chaetoceros 7-10 um (chains) DRE - ???? 2 10 Phase Function (sr 1) 0 10 2 10 4 10 0 20 40 60 80 100 120 140 160 180 Scattering Angle (Degrees)
LISST, Eco VSF, Mie Theory 2 10 0 10 Phase Function (sr 1) 2 10 4 10 6 10 0 20 40 60 80 100 120 140 160 180 Scattering Angle (Degrees) - Fit phase function to LISST and VFS measurements of bead mixtures (and well characterized culture? Coccolithophores?). - Compare the phase function to the predicted function calculated using Mie theory. - Video for explaining the calibration, data collection, deployment, data analysis of LISST.
