# homework6_answers - Homework Problem Set#6 ATOC/ASEN 5235...

This preview shows pages 1–2. Sign up to view the full content.

1 Homework Problem Set #6 ATOC/ASEN 5235, Fall 2010 Due Thursday, 4 November 1. 10 points. Petty 11.4. Explain how the presence of non-absorbing, scattering aerosols (e.g., haze) would be expected to visibly affect both (a) the color of the sky and (b) the angular dependence of the intensity of scattered sunlight. Answer : (a) Because of the strong dependence of molecular scattering on wavelength, we expect the aerosol-free atmosphere to scatter short wavelengths much more readily than long wavelengths. This disparity is why a clear sky (not too close to the sun) is deep blue. Typical aerosols, on the other hand, scatter all wavelengths fairly equally. Therefore, the addition of non-absorbing aerosols (i.e, haze) to the atmosphere tends to wash out the blue color and instead add a whitish hue. (b) Because molecules are Rayleigh scatterers of visible radiation, there is no strong forward peak to the phase function. Rather, the intensity of scattered radiation is only weakly dependent on the direction in which you're looking. Thus, when the sky is deep blue, indicating a relative lack of other scatterers, you can cover the sun with your hand and see very little brightening of the sky even relatively close to the sun's disk. On a hazy day, however, the portion of the sky within several degrees of the sun will be considerably brighter than it is in directions away from the sun, and it will be hard to look in that direction even with the sun's disk blocked.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern