References: Acidic Deposition:State of Science and Technology (report 24) 1990 Visibility: Existing...

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References: http://vista.cira.colostate.edu/improve/ Acidic Deposition:State of Science and Technology (report 24) 1990 Visibility: Existing and Historical Conditions – Causes and Effects Introduction to Visibility (WC Malm) issn 0737-5352-40 (CIRA-CSU)
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Transcript of References: Acidic Deposition:State of Science and Technology (report 24) 1990 Visibility: Existing...

Page 1: References:  Acidic Deposition:State of Science and Technology (report 24) 1990 Visibility: Existing and Historical.

References: References:

• http://vista.cira.colostate.edu/improve/

• Acidic Deposition:State of Science and Technology (report 24) 1990 Visibility: Existing and Historical Conditions – Causes and Effects• Introduction to Visibility (WC Malm) issn 0737-5352-40 (CIRA-CSU)

Page 2: References:  Acidic Deposition:State of Science and Technology (report 24) 1990 Visibility: Existing and Historical.

What is Visibility?

Historically visibility was thought of in terms of the furthest distance one could see a large black object.

From a scenic vista perspective, there’s more interest in color, line, texture, and form of a scenic landscape feature.

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How far can you see?

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Great Smoky MountainsNational Park

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Yosemite National Park

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Glacier National Park

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Canyonlands National Park

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Big Bend National Park

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Layered Hazes

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Layered Hazes

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The Seeing of a Landscape Feature

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Relationship Between Aerosols and Optical Properties

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The extinction coefficient is made up of

particle and gas scattering and absorption:

where s, a, g, and p refer to scattering, absorption, gases, and particles, respectively.

ext sg ag sp apb = b +b +b +b

Extinction =

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Scattering Efficiency (Q)

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Single Particle Efficiency

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Particle Size Distribution

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Scattering Efficiency as Function of Size

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Carbon Extinction Efficiency

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Phase Function for Soil and Sulfate

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Phase Function for Carbon

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Forward and Backward Scattering

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On the Nature of Light

Wave-like characteristics of light Electromagnetic radiation Photons and color Why objects are colored Atmospheric optical effects

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IntroVis.exe