Processes affecting concentrations of aerosol strong acidity at sites in eastern England |
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| Institution: | 1. Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970 São Carlos, SP, Brazil;2. PPG-CEM, Department of Materials Engineering, Center for Exact Sciences and Technology, Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, Brazil;3. PPGQ, Department of Chemistry, Center for Exact Sciences and Technology, Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, Brazil;1. Columbia University College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, United States;2. Department of Psychiatry, Columbia University Medical Center, New York, NY, United States;3. New York State Psychiatric Institute, New York, NY, United States;4. Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States;1. Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China;2. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;3. School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710129, China |
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| Abstract: | Concentrations of aerosol strong acidity and related species have been measured at sites in eastern England using a sampler in which ammonia is pre-separated by a denuder. High concentrations occurred at a coastal site and were associated with air advected over the North Sea. At inland sites, ammonia concentrations were higher and the aerosol was more substantially neutralized. Daytime concentrations of aerosol H+ exceeded those measured at night, despite higher daytime levels of ammonia, presumably due to more effective production of H2SO4 during daytime hours. Concentrations of acidic aerosols were within the range 0–178 neq m−3, well below those observed at many eastern North American sites with lower concentrations of ammonia. |
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