| Title: | Ozone Formation Induced by the Impact of Reactive Bromine and Iodine Species on Photochemistry in a Polluted Marine Environment |
| Address: | "The Department of Soil and Water Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem , Rehovot, Israel" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Reactive iodine and bromine species (RIS and RBS, respectively) are known for altering atmospheric chemistry and causing sharp tropospheric ozone (O(3)) depletion in polar regions and significant O(3) reduction in the marine boundary layer (MBL). Here we use measurement-based modeling to show that, unexpectedly, both RIS and RBS can lead to enhanced O(3) formation in a polluted marine environment under volatile organic compound (VOC)-limited conditions associated with high nitrogen oxide (NO(X) = [NO] + [NO(2)]) concentrations. Under these conditions, the daily average O(3) mixing ratio increased to approximately 44 and approximately 28% for BrO and IO mixing ratios of up to approximately 6.8 and 4.7 ppt, respectively. The increase in the level of O(3) was partially induced by enhanced ClNO(3) formation for higher Br(2) and I(2) emission flux. The increase in the level of O(3) was associated with an increased mixing ratio of hydroperoxyl radical to hydroxyl radical ([HO(2)]/[OH]) and increased [NO(2)]/[NO] with higher levels of RBS and/or RIS. NO(X)-rich conditions are typical of the polluted MBL, near coastlines and ship plumes. Considering that O(3) is toxic to humans, plants, and animals and is a greenhouse gas, our findings call for adequate updating of local and regional air-quality models with the effects of activities of RBS and RIS on O(3) mixing ratios in the polluted MBL" |
| Keywords: | Air Pollutants *Bromine Humans Iodine *Ozone Photochemistry Water Pollutants; |
| Notes: | "MedlineShechner, M Tas, E eng 2017/11/08 Environ Sci Technol. 2017 Dec 19; 51(24):14030-14037. doi: 10.1021/acs.est.7b02860. Epub 2017 Nov 27" |
