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Compare and contrast SAGE II with PICASSO-CINA.

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How will PICASSO-CINA help scientists measure aerosols more accurately?

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Dr. Anderson?

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Hi, Jennifer.

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Hi, Van.

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Hi.

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Dr. DeYoung told me you guys were coming over to learn how a satellite instrument measures

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aerosols.

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Actually, he thought you could help us out on information about satellite systems.

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I'd be glad to help.

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I'm involved with a satellite instrument called SAGE II, which stands for Stratospheric Aerosol

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and Gas Experiment.

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The less sunlight that gets through the atmosphere at specific wavelengths, the higher density

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of aerosols there are in the atmosphere.

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A way to demonstrate what the SAGE II photometer might see up in space is to hit two erasers

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together and shine a light through the dust.

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This light from the flashlight represents the light from the sun.

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Photometers look at the reduction of the sun's light to measure how many aerosols there are

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between the sun and the satellite.

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Remember, SAGE II only uses light from the sun.

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You know, Van, when I was a student in college, I had to actually collect samples from a real

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cloud.

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Really?

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Oh, yeah.

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I would climb Mount Mitchell, North Carolina when the clouds would collect around the mountain.

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Droplets would form on a Teflon string collector I would hold up and would run down into a

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container.

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It demonstrates the same principle which applies when water vapor is attracted to an aerosol

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in the atmosphere to create drops in clouds.

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Cool.

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Say, how would you like to learn about the Picasso SINA system?

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Okay.

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Picasso SINA, like SAGE II, will be a satellite-borne instrument that measures aerosols.

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But it is quite different than SAGE II in that Picasso SINA uses active remote sensing

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while SAGE II uses passive remote sensing.

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My colleague, Dr. Ali Omar, is developing the Picasso SINA system along with Hampton

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University, NASA Langley Research Center, Ball Aerospace, and the French Space Agency,

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CNES.

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Why don't I send both of you over to see them right now?

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That would be great.