Photodissociation of nitric oxide in the middle and upper atmosphere |
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| Institution: | 1. Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200030, PR China;2. Collaborative Innovation Center for Brain Science, Shanghai Jiao Tong University, Shanghai 200030, PR China;3. Shanghai Key Laboratory of Psychotic Disorders, Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200030, PR China;4. Shanghai Changning Mental Health Center, 299 Xiehe Road, Shanghai 200042, PR China;5. Institute of Neuropsychiatric Science and Systems Biological Medicine, Shanghai Jiao Tong University, Shanghai 200042, PR China;6. Shanghai Information Technology Co., Ltd., 951 Technology Park, Building B CANGYUAN Jianchuan Road, Minhang District, Shanghai 200240, PR China;7. University of Azad Jammu and Kashmir, Dept. of Chemistry, Muzaffarabad 13100, Pakistan;1. Faculty of Engineering and Architecture, Bitlis Eren University TR-13100, Bitlis, Turkey;2. Department of Geological Engineering, Recep Tayyip Erdo?an University TR-53100, Rize, Turkey;3. Department of Geological Engineering, Süleyman Demirel University TR-32000, Isparta, Turkey |
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| Abstract: | Absorption of solar radiation of wavelengths between 175 to 205 nm plays a fundamental role in the photochemistry of the middle atmosphere. Nitric oxide photodissociates in the δ(0-0) and δ(1-0) bands near 191 and 183 nm, respectively, initiating the primary mechanisms for NOx removal in the middle atmosphere. The spectrally rich Schumann-Runge (S-R) bands of O2 are the main source of atmospheric opacity at these wavelengths. A re-evaluation of O2 absorption has been made based on recent advances in understanding of S-R line shapes, leading to differences with conventional approaches assuming Voigt line profiles in line-by-line calculations of the O2 cross section. The new results are used to examine the impact of O2 transmission on the photodissociation of NO in the δ(0,0) and δ(1,0) bands. |
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