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Chemical and Dynamical Processes in the Atmospheres of I. Ancient and Present-Day Earth II

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Chemical and Dynamical Processes in the Atmospheres of I. Ancient and Present-Day Earth II. Jupiter and Galilean Satellites III. Extrasolar \Hot Jupiters" Thesis by Mao-Chang Liang In Partial Ful¯llment of the Requirements for the Degree of Doctor of Philosophy California Institute of Technology Pasadena, California 2006 (Defended Nov 7, 2005) ii °c 2006 Mao-Chang Liang All Rights Reserved iii Acknowledgements I would like to thank my family for not stopping me from doing academic research; they completely supported my decision. (In Chinese culture, children's plans are mostly under their parents' control.) I would also like to acknowledge my master's thesis advisor, Professor Fred Lo, for teaching me how to be a good scientist and re- searcher. The major thing I learned from him is that, to be a good scientist, one has to remember that theory and experiments are equally important. For working on theory, one has to think of what experiments can support your theory; for experimentalists, to interpret the results requires a deep understanding of the background physics or theory. This clearly is seen from my Ph.D. advisors, Professors Yuk Yung and Ge- o® Blake, who work closely with theorists and experimentalists. Their great help in launching my research career has been invaluable. I would then want to thank my girlfriend, Bows Chiou, and colleagues Mark Allen, Mimi Gerstell, Xun Jiang, Anthony Lee, Chris Parkinson, Run-Lie Shia, and many others for their insightful comments/discussion on my research. Financial support from National Aeronautics and Space Administration (NASA) and National Science Foundation (NSF) are ac- knowledged. iv Abstract When exposed to stellar UV radiation, chemical processes will be governed not only by temperature/pressure but also the spectrum of the incoming dissociative photon flux; the system will approach kinetic, or photochemical, equilibrium, instead of ther- mochemical equilibrium. Over the previous decades, photochemistry has proven to be a powerful tool for predicting the chemical composition in the atmospheres of so- lar planets and their satellites. For example, the ozone layer in our own atmosphere (stratosphere) is a photochemical product of oxygen. In this thesis, I apply a photo- chemical model to the study of a variety of astronomical objects: the Earth, Jupiter, the Galilean satellite Callisto, and extrasolar \hot Jupiters" (HD 209458b). For the Earth, a method for utilizing the isotopic composition of CO2 and N2O to monitor global changes due to these two greenhouse gases is developed. For objects other than the Earth, the model facilitates in the interpretation of data acquired by remote (tele- scopic) and in situ (spacecraft) measurements. The ultimate goal is to understand the conditions of chemical and physical environments in protoplanetary nebulae, which will provide clues as to the formation of planetary systems; the synthesis of organic compounds which could lead to the appearance of life; and the evolution of planetary atmospheres such as the formation of Titan's nitrogen-rich atmosphere. v Contents Acknowledgements iii Abstract iv 1 Introduction 1 2 An Overview of Kinetic Models 8 2.1 Chemical Reactions . 9 2.2 Caltech/JPL Multi-Dimensional Kinetics Models . 10 2.2.1 One-Dimensional Model . 11 2.2.2 Two-Dimensional Model . 14 2.2.3 Modi¯ed Two-Dimensional Model . 16 I Ancient and Present-Day Earth 22 3 A Semianalytic Model for Photo-Induced Isotopic Fractionation in Simple Molecules 23 3.1 Introduction . 24 3.2 Method . 26 vi 3.2.1 The Reflection Principle . 26 3.2.2 Analytic Solution for Diatomic Molecules . 27 3.2.3 Triatomic Molecules . 33 3.2.4 Temperature Dependence . 36 3.3 Applications . 37 3.3.1 Diatomic Molecules: HCl and HI . 37 3.3.2 Linear Triatomic Molecule: N2O . 41 3.3.3 Nonlinear Triatomic Molecule: O3 . 42 3.4 Applications to the Atmosphere . 43 3.5 Conclusion . 45 4 Isotopic Composition of Stratospheric Ozone 68 4.1 Introduction . 69 4.2 Atmospheric Models . 73 4.2.1 One-Dimensional Model . 73 4.2.2 Ozone Formation . 75 4.2.3 Ozone Photolysis . 77 4.3 Results . 79 4.3.1 Vertical Pro¯les . 79 4.3.2 Three-Isotope Plots . 81 4.4 Conclusion . 82 5 Oxygen Isotopic Composition of Carbon Dioxide in the Middle At- mosphere 105 vii 5.1 Introduction . 106 1 5.2 Exchange Reactions between O( D) and CO2 . 108 5.3 Sources of O(1D) . 110 5.4 One-Dimensional Model . 111 5.5 Three-Box Model . 112 6 Production of Oxidants in the Atmosphere of a Snowball Earth 120 6.1 Introduction . 121 6.2 Hypothesis . 123 6.3 Atmospheric Chemical Processes . 123 6.4 Biological Implications . 125 II Jupiter and the Galilean Satellites 134 7 Meridional Transport in the Stratosphere of Jupiter 135 7.1 Introduction . 136 7.2 Two-Dimensional Transport Model . 137 7.3 Simulation Results . 139 7.4 Conclusion . 142 8 Atmosphere of Callisto 151 8.1 Introduction . 152 8.2 Model Description . 154 8.3 General Results . 156 viii 8.3.1 Electron Density and Hydrogen Abundance . 156 8.3.2 Carbon Dioxide and Carbon Monoxide . 158 8.3.3 Atomic Carbon and Atomic Oxygen . 159 8.4 Discussion . 160 8.5 Summary . 163 III Extrasolar \Hot Jupiters" 180 9 Source of Atomic Hydrogen in the Atmosphere of HD 209458b 181 9.1 Introduction . 182 9.2 Model . 183 9.3 Results . 185 9.3.1 OH and O Radicals . 185 9.3.2 CO2 and CH4 . 186 9.3.3 H and H2O ............................ 188 9.4 Conclusion . 189 10 On the Insigni¯cance of Photochemical Hydrocarbon Aerosols in the Atmospheres of Close-in Extrasolar Giant Planets 198 10.1 Introduction . 199 10.2 Model . 201 10.3 Results . 203 10.4 Discussion . 205 ix List of Figures 3.1 Photolysis Model|Schematic diagram of the direct photodissociation process, illustrating the Born-Oppenheimer approximation and the Re- flection Principle (dashed lines). \L" and \H" refer to the standard and isotopically substituted species, respectively. ª0, Vg, and Ve denote the vibrationally averaged ground state wavefunction, ground state elec- tronic potential, and dissociating electronic potential, respectively. 55 3.2 Photolysis Model|Schematic diagram illustrating the steps in the ap- plication of the photodissociaton model, described in section 3.2. The vertical axis refers to the physical quantity in the upper-left corner in each panel; the horizontal axis denotes the photon frequency º. \L" and \H" denote the standard and isotopically substituted species, re- spectively. The full procedure is divided into ¯ve steps: (a)-(e). See text for details. 56 x 3.3 Photolysis Model|Applications of the new photodissociation algorithm to the diatomic molecules HCl/DCl and HI/DI. The ¯rst three pan- els present the decomposition of the individual cross sections into their isotope-dependent (G) and isotope-independent (γ) components. The bottom two panels present various ¯ts to the D/H fractionation fac- tor(s). The dissociation cross sections in Figures 3.3a and 3.3f have been divided by the maximum cross sections of the standard species ¡18 2 ¡18 2 HCl and HI, with σP = 3:4 £ 10 cm and σP = 8:2 £ 10 cm , respectively. The various model ¯ts in Figures 3.3d and 3.3i denote the state decomposition from the spin-orbit coupling of Cl and I. The ¯nal ¯ts incorporating γ are given in Figures 3.3e and 3.3j. 57 3.4 Photolysis Model| a: The 14N14N16O photodissociation cross section, measured by Yoshino et al. [1984] at 295 K, and normalized to the peak ¡18 2 σP = 1:4 £ 10 cm . The gaussian ¯t is shown by the dotted line. b: The form of γ for N2O. A fourth-order polynomial ¯t is shown by the dotted line, which has a functionality similar to the HCl and HI systems (see Figures 3.3c and 3.3h). 58 3.5 Photolysis Model|Comparison of the predicted ² using our new algo- rithm to YM97's ZPE model, Johnson et al.'s ab initio calculation, and laboratory measurements (with 2-σ error bar overplotted) for four N2O isotopologues/isotopomers. The solid curve depicts the temperature- independent model described in section 3.2.4. 59 xi 3.6 Photolysis Model|Comparison of the temperature dependence of ² us- ing the three state temperature-dependent model (section 3.2.4) to John- son et al.'s ab initio calculation for N2O isotopologues/isotopomers at 295 and 233 K. 60 3.7 Photolysis Model| a: The dissociation cross sections of 16O16O16O and 18O18O18O as measured by Parisse et al. [1996], at 295 K and normalized ¡17 2 to σP = 1:2 £ 10 cm . The decomposed γ is shown in panel b. 61 3.8 Photolysis Model|Comparison of the predicted ² to the YM97's ZPE model and laboratory measurements [Parisse et al., 1996] for O3 iso- topologues and isotopomers. 62 3.9 Photolysis Model|Applications of the predicted fractionations of the dissociation cross sections of nitrous oxide's isotopologues/isotopomers in the Earth's lower and upper stratosphere. ln(f) = ¡0:6 was used to delineate the boundary, where f is the ratio of the remaining N2O to that of the initial N2O in the upwelling air parcel. White bar: Atmospheric measurements, with 1-σ error bars overplotted. Light gray bar: This work. Dark gray bar: Johnson et al.'s ab initio calculations. Black bar: The ZPE model of YM97. 63 4.1 Ozone|Pro¯les of temperature (solid line) and eddy di®usion coe±cient (dashed line) used in the calculation. These two pro¯les are taken from Allen et al. [1981]. Dotted line represents a temperature pro¯le equal to the solid line reduced by 8%.
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