Thesis (Ph. D.)--Indiana University, Dept. of Geography, 2008. / Title from PDF t.p. (viewed Oct. 7, 2009). Source: Dissertation Abstracts International, Volume: 70-02, Section: B, page: 0895. Adviser: Hans Peter Schmid.

Spectroscopic measurements of the night airglow were taken at mid latitude over a period of four months. The use of intensified CCD spectrographs allowed simultaneous data to be taken from 3000Å to 9200Å in 3300 contiguous spectral elements with a resolution (full width at half max.) of 6Å to 15Å. The average intensities for a 6.5 hour integration period on March 16, 1991 of the O₂ Herzberg I, Chamberlain, Herzberg II, and Atmospheric (0-1) emissions were 230 ± 20 R, 80 ± 10 R, 80 ± 40 R, and 350 ± 20 R respectively. For the OH Meinel (9-4), (8-3), (7-2), (7-3), (6-2), (5-1), (4-0) emissions the intensities were 450 ± 50 R, 450 ± 20 R, 90 ± 20 R, 1620 ± 200 R, 970 ± 50 R, 680 ± 15 R, and 190 ± 20 R respectively. The OI 5577Å and 6300Å emissions were 320 ± 10 R and 160 ± 10 R respectively. These simultaneous emission intensities were compared with an atmospheric model which revealed that the O₂(A³Σ, A'³Δ, c¹Σ, b¹Σ) states and the OH(X²Π) state were heavily quenched. Analysis of the vibrational distributions of the O₂(A³Σ, A'³Δ, c¹Σ) states and the OH(X²Π) state, and dynamic intensity fluctuations of their related emission features provided independent confirmation of the conclusion that the O₂(A³ Σ, A'³Δ, c¹Σ) states and the OH(X²Π) state were heavily quenched.

Spectra from 1.7-3.3 μm acquired at the NASA Kuiper Airborne Observatory include 2 of Saturn's near-IR atmospheric transmission windows that are at least partially obscured by telluric H₂O and CO₂ absorptions at ground-based telescopes. This entire spectral region was fitted to a model that included gaseous absorption by H₂, CH₄, NH₃, and PH₃ and the effects of multiple scattering by haze. The objectives were to determine accurate elemental abundance ratios (e.g., C/H, P/H, etc) and to characterize the size, distribution, and composition of the haze particles in Saturn's atmosphere. The results for C/H and P/H are 8.5 x 10⁻⁴ and 4.3 x 10⁻⁷, respectively. No evidence of gaseous NH₃ was found. The upper limit to the NH₃ mixing ratio at Saturn's radiative-convective boundary is ≈ 10⁻⁹. Ammonia is decidedly undersaturated at atmospheric pressures lower than ≈ 1 bar. The upper limit to gaseous NH₃ at 3 μm is extremely low compared to detected amounts derived from observations at visible, mid-IR, and microwave wavelengths. These differences can be reconciled on the basis of different mechanisms for spectral line formation in these disparate spectral regions. A search for solid phase NH₃ was also negative. From thermochemical arguments it has been widely assumed that NH₃ ice crystals comprise the upper clouds on Saturn, although no incontrovertible spectroscopic proof has ever been presented. Strong bands of solid NH₃ at 3 μm therefore offer an important test of this assumption. Saturn's observed spectrum was placed on an absolute reflectivity scale which then could be compared with synthesized spectra of candidate haze particles. The calculations demonstrated that the reflectances of pure, polydisperse NH₃ ice crystals with effective radii ranging from 0.1 to 2.25 μm are not compatible with Saturn's 3 μm spectrum. A reasonable fit to Saturn's continuum spectrum can only be achieved by using bright, micron-sized scattering haze particles mixed-in with H₂, CH₄, and PH₃ in Saturn's middle and upper troposphere. This research was supported by NASA grant NAG2-206 and GSRP grant NGT-50782.

No description available.

Thesis (Ph.D.)--Indiana University, School of Public and Environmental Affairs, 2008. / Title from PDF t.p. (viewed on May 13, 2009). Source: Dissertation Abstracts International, Volume: 69-08, Section: B, page: 4637. Adviser: Philip S. Stevens.

Thesis (M.S.) in Quaternary and Climate Studies--University of Maine, 2008. / Includes vita. Includes bibliographical references (leaves 55-61).

Thesis (Ph. D.)--Indiana University, School of Public and Environmental Affairs, 2008. / Title from dissertation home page (viewed Sept. 30, 2008). Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1537. Adviser: Philip S. Stevens.

Thesis (Ph. D.)--University of Toronto, 2008. / Includes bibliographical references.

Thesis (Ph.D.)--Indiana University, Dept. of Geography, 2008. / Title from PDF t.p. (viewed Dec. 9, 2008). Source: Dissertation Abstracts International, Volume: 69-05, Section: A, page: 1935. Adviser: Scott M. Robeson.

Thesis (Ph.D.)--Indiana University, Dept. of Geography, 2009. / Title from PDF t.p. (viewed on Jul 20, 2010). Source: Dissertation Abstracts International, Volume: 70-12, Section: B, page: 7439. Advisers: Scott Robeson; Hans Peter Schmid.