Examination of the impact of photoexcited NO2 chemistry on regional air quality |
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| Authors: | Golam Sarwar Robert W Pinder K Wyat Appel Rohit Mathur Annmarie G Carlton |
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| Institution: | 1. Department of Applied Physics, University of Granada, Granada, 18071, Spain;2. Andalusian Institute for Earth System Research (IISTA), University of Granada, 18006, Spain;3. Atmospheric Chemistry and Climate Group, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain;4. National Institute for Meteorology and Hydrology (INAMHI), Quito, Ecuador;5. Atmospheric Research and Instrumentation Branch, National Institute for Aerospace and Technology (INTA), Madrid, Spain;1. Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou 350004, China;2. Fujian Provincial Key Laboratory of Screening for New Novel Microbial Products, Fujian Institute of Microbiology, Fuzhou 350007, China;3. Institute of Materia Medica, Fujian Academy of Medical Sciences, Fuzhou 350001, China;4. Nano Medical Technology Research Institute, Fujian Medical University, Fuzhou 350004, China;1. Imec, Kapeldreef 75, B-3001 Leuven, Belgium;2. ESAT-ELECTA, KU-Leuven, Kasteelpark Arenberg 10, B-3001 Leuven, Belgium;3. Kuwait University, College of Engineering and Petroleum, Electrical Engineering Department, Safat 13060, Kuwait;4. University of Debrecen, Faculty of Science and Technology (TTK), Institue of Physics, 4026, Bem square 18/b, Hungary |
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| Abstract: | Impact of the excited nitrogen dioxide (NO21) chemistry on air quality in the U.S. is examined using the Community Multiscale Air Quality (CMAQ) model for a summer month. Model simulations were conducted with and without the NO21 chemistry. The largest impact of the NO21 chemistry in the eastern U.S. occurred in the northeast and in the western U.S. occurred in Los Angeles. While the single largest daily maximum 8-h ozone (O3) increased by 9 ppbv in eastern U.S. and 6 ppbv in western U.S., increases on most days were much lower. No appreciable change in model performance statistics for surface-level O3 predictions relative to measurements is noted between simulations with and without the NO21 chemistry. Based on model calculations using current estimates of tropospheric emission burden, the NO21 chemistry can increase the monthly mean daytime hydroxyl radicals (OH) and nitrous acid (HONO) by a maximum of 28% and 100 pptv, respectively. |
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