Dust Optical Properties Louie Grasso - PowerPoint Presentation

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Dust Optical PropertiesLouie GrassoApril 2017MURI

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2Igor Dust

WL .............. wavelength (um)! Qext, Qsca

...... extinction and scattering efficiency factors (

unitless

)

! ALBEDO........... single scattering albedo (unitless) ! <cos> ........... average cosine (asymmetry factor) (unitless) ! AREA ............ mean particle area ( (um)**2 ) ! MR, MI........... real and imagine part of the refractive index (unitless) ! (D) DustModel_99_00_01.dat (quartz(99%), kaolinite(00%), hematite(1%))  Mixture of mineral types. From Igor Polonsky! clear pointy, chalk dull, metallic shiney!!! WL Qext Qsca ALBEDO <cos> AREA MR MI!! 0.4700 1.5379 1.5257 0.99577 0.66652 1.5177 1.5624 -2.7400e-003! 0.5550 1.3449 1.3364 0.99708 0.65445 1.5177 1.5635 -8.7510e-004! 0.6400 1.2161 1.2136 0.99911 0.64911 1.5177 1.5625 -8.7370e-005! 0.8600 1.0641 1.0630 0.99941 0.64850 1.5177 1.5578 -4.0000e-005! 1.3800 1.0490 1.0490 1.0000 0.65491 1.5177 1.5492 -1.6310e-007! 1.6100 1.0729 1.0729 1.0000 0.65808 1.5177 1.5460 -1.2440e-007! 2.2600 1.0937 1.0919 0.99834 0.67848 1.5177 1.5250 -1.5721e-004! 3.9000 0.83182 0.82829 0.99574 0.70992 1.5177 1.4677 -6.0244e-004 ! 6.1900 0.26909 0.25929 0.96241 0.74005 1.5177 1.3050 -3.5198e-003! 6.9500 0.05972 0.023485 0.26862 0.75687 1.5177 1.0838 -1.8771e-002 ! 7.3400 0.06267 0.017258 0.14130 0.72496 1.5177 0.95857 -2.7780e-002! 8.5000 1.5982 0.81787 0.51386 0.35931 1.5177 0.11002 -1.2137e+000 ! 9.6100 0.98933 0.59626 0.60362 0.25575 1.5177 3.5964 -1.8756e-001! 10.350 0.78815 0.68915 0.87455 0.37986 1.5177 2.3897 -3.5929e-002  Optical properties used for 10.35 um. ! 11.200 0.50601 0.47176 0.93232 0.46435 1.5177 1.9588 -1.7142e-002 ! 12.300 0.19822 0.12770 0.64286 0.55124 1.5177 1.4887 -5.9505e-002  Optical properties used for 12.3 um. ! 13.300 0.61972 0.28521 0.46139 0.40673 1.5177 2.3892 -4.5892e-001

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Figure: Synthetic imagery from 12 Z 4 August 2016 WRF-CHEM simulation at

10.35

µm with

(A) No Dust and (B) Igor Dust (effective radius = 2.4 µm).(A)(B)

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(A

)

(B

)Figure: Synthetic imagery from 12 Z 4 August 2016 WRF-CHEM simulation at 12.30 µm with (A) No Dust and (B) Igor Dust (effective radius = 2.4 µm).

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(A)

(B)

Figure: Synthetic imagery from 12 Z 4 August 2016 WRF-CHEM simulation at

10.35 µm with no dust and contours of (A) TPW (mm) and (B) Tb(10.35)-Tb(12.3) (Kelvin).

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Figure: Synthetic imagery from 12 Z 4 August 2016 WRF-CHEM simulation at

10.35

µm

including dust (effective radius = 2.4 µm) and contours of (A) AOD at 10.35 µm and (B) Tb(10.35)-Tb(12.3) (Kelvin).

Next: Use Irina’s dust complex index of refraction, which is displayed on the next slideAdditional plots not added….yet

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Dust: Southwest USA

Figure

:

Real

(A) and complex (B) index of refraction denoted in black. Average values within each GOES-R ABI bands is denoted in green. Plots were generated from data provided by Irina Sokolik of Georgia Tech, 18 April 2013. See Genesis:/home/grasso/igor_polonsky/read_refIWhi.f90. Black: dataGreen: Average over ABI bandsAB13

Test to see if Mie is a linear transformationThat isM(a*Ice + b*Liquid)=a*M(Ice)+b*M(liquid)

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15Figure: Extinction at 3.9 um of ice-water(black curve), liquid-water(red curve), and a mixture of both(green curve). Plot suggests that Mie is approximately a linear transformation

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16Figure: Single Scattering Albedo

at 3.9 um of ice-water(black curve), liquid-water(red curve), and a mixture of both(green curve). Plot suggests that Mie is approximately a linear transformation

17Figure: Asymmetry Factor

at 3.9 um of ice-water(black curve), liquid-water(red curve), and a mixture of both(green curve). Plot suggests that Mie is approximately a linear transformation

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