edu.ucar.opensky::articles:23401 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:09:05.054829 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7vx0kr3 https://doi.org/10.1594/PANGAEA.912746 https Related Dataset #1 10-min averages of ambient ClNO2, N2O5, HNO3, and O3 measured at 12 m above ground level in Ann Arbor, Michigan, USA, from February 1 to March 10, 2016 Observation of road salt aerosol driving inland wintertime atmospheric chlorine chemistry 2020-05-27T00:00:00Z publication https://n2t.org/ark:/85065/d7vx0kr3 https://doi.org/10.1021/acscentsci.9b00994 McNamara, S. M. author Kolesar, K. R. author Wang, S. author Kirpes, R. M. author May, N. W. author Gunsch, M. J. author Cook, R. D. author Fuentes, J. D. author Hornbrook, Rebecca author Apel, Eric C. author China, S. author Laskin, A. author Pratt, K. A. author UCAR/NCAR - Library publisher Inland sources of particulate chloride for atmospheric nitryl chloride (ClNO2) formation remain unknown and unquantified, hindering air quality assessments. Globally each winter, tens of millions of tons of road salt are spread on roadways for deicing. Here, we identify road salt aerosol as the primary chloride aerosol source, accounting for 80-100% of ClNO2, formation, at an inland urban area in the wintertime. This study provides experimental evidence of the connection between road salt and air quality through the production of this important reservoir for nitrogen oxides and chlorine radicals, which significantly impact atmospheric composition and pollutant fates. A numerical model was employed to quantify the contributions of chloride sources to ClNO2 production. The traditional method for simulating ClNO2 considers chloride to be homogeneously distributed across the atmospheric particle population; yet, we show that only a fraction of the particulate surface area contains chloride. Our new single-particle parametrization considers this heterogeneity, dramatically lowering overestimations of ClNO2 levels that have been routinely reported using the prevailing methods. The identification of road salt as a ClNO2 source links this common deicing practice to atmospheric composition and air quality in the urban wintertime environment. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation