4B.5 Mobile Laboratory Measurements of Ozone, NO2, and Submicron PM Downwind of NYC during the 2018 LISTOS Field Intensive

Tuesday, 14 January 2020: 9:30 AM
207 (Boston Convention and Exhibition Center)
James J. Schwab, Univ. at Albany, SUNY, Albany, NY; and J. Zhang, M. Ninneman, E. D. Joseph, M. J. Schwab, and B. Shrestha

The Long Island Sound Tropospheric Ozone Study (LISTOS) project was organized to investigate ozone formation and transport in the New York City metropolitan area and locations downwind. During LISTOS, the University at Albany Atmospheric Sciences Research Center (ASRC) mobile laboratory was used for measuring the surface O3, NO2, and aerosol number and mass concentration. Sharp O3 concentration gradients, with ∆O3 ∆y-1 over 10 ppb km-1, were measured both at the shoreline and on the highway on days characterized by high regional O3 concentrations. These large O3 gradients at the shoreline and on the highway were likely due in part to the sea breeze circulation and VOC-NOx-O3 photochemistry, respectively. On the highway under regionally high O3 concentrations, strong anticorrelation (r2=0.84, p<0.05) between O3 and NO2 indicated that the O3 production regime was NOx-saturated, and the positive relationship (r2=0.90, p<0.05) between Ox (O3+NO2) and NO2 suggested a NOx-independent regional contribution to the O3 level (about 90 ppb). Moreover, the days influenced by the long-range transport of biomass burning plumes showed a relatively low O3 concentration (generally below 70 ppb) and an enhanced aerosol concentration (generally over 15 µg m-3). Overall, the on-road measurements made during LISTOS help to better understand the interaction between the emitted pollution and the meteorological conditions on Long Island, thereby having potential policy implications.
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