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Yates, E. L., M. S. Johnson, L. T. Iraci, J. –M., Ryoo, R. B. Pierce, P. D. Cullis, W. Gore, M. A. Ives, B. J. Johnson, T. Leblanc, J. E. Marrero, C. W. Sterling, and T. Tanaka (2017), An assessment of ground-level and free-tropospheric ozone over California and Nevada, J. Geophys. Res. Atmos., 122, doi:10.1002/2016JD026266.

  • Increasing free tropospheric ozone (O3), combined with the high elevation and often deep boundary layers at western U.S. surface stations, poses challenges in attaining the more stringent 70 ppb O3 National Ambient Air Quality Standard. As such, use of observational data to identify sources and mechanisms that contribute to surface O3 is increasingly important. This work analyzes surface and vertical O3 observations over California and Nevada from 1995 to 2015. Over this period, the number of high O3
  • events (95th percentile) at the U.S. Environmental Protection Agency Clean Air Status and Trends Network (CASTNET) sites has decreased during summer, as a result of decreasing U.S. emissions. In contrast, an increase in springtime 5th percentile O3 indicates a general increase of baseline O3. During 2012 there was a peak in exceedances and in the average spring-summer O3 mixing ratios at CASTNET sites. Goddard Earth Observing System-Chem results show that the surface O3 attributable to transport from the upper troposphere and stratosphere was increased in 2013 compared to 2012, highlighting the importance of measurements aloft. Vertical O3 measurements from aircraft, ozonesondes, and lidar show distinct seasonal trends, with a high percentage of elevated O3 laminae (O3 > 70 ppb, 3–8 km) during spring and summer. Analysis of the timing of high O3 surface events and correlation between surface and vertical O3 data is used to discuss varying sources of western U.S. surface O3.

S. S. Kulawik, C. O’Dell, V. H. Payne, L. Kuai, H, Worden, C. Sweeney, S. C Biraud, E. Dlugokencky, L. T. Iraci, E. L. Yates, T. Tanaka. “Lower-tropospheric CO2 from near infrared ACOS-GOSAT observations”, Atmospheric Chemistry & Physics Discussions, doi: 10.5194/acp-2016-720, in press, 2017.

J. –M. Ryoo, M. S. Johnson, L. T. Iraci, E. L. Yates, R. B. Pierce, W. Gore. “Investigating sources of ozone in California using AJAX airborne measurements and models: Implications for stratospheric intrusion and long-range transport” Atmospheric Environment, 155, 53-67, 2017, doi: 10.1016/j.atmosenv.2017.02.008.

M.S. Johnson, X. Xi, S. Jeong, E. L. Yates, L. T. Iraci, T. Tanaka, M. Loewenstein, J. M. Tadić, M. Fischer.  “Investigating seasonal methane emissions on northern California using airborne measurements and inverse modelling” Journal of Geophysical Research, 121, 13753-13767, 2016, doi: 10.1002/2016JD025157.

T. Tanaka, E.L. Yates, L.T. Iraci, M.J. Johnson, W. Gore, J.M. Tadić, M. Loewenstein. Three years comparison of airborne measurements of CO2 and CH4 with GOSAT at Railroad valley, Nevada, IEEE Transactions on Geoscience and Remote Sensing, 54(8), 2016, doi: 10.1109/TGRS.2016.2539973.

E.L. Yates, L.T. Iraci, H.B. Singh, T. Tanaka, M.C. Roby, P. Hamill, C.B. Clements, N. Lareau, J. Contezac, D.R. Blake, I.J. Simpson, A. Wisthaler, T. Mikoviny, G.S. Diskin, A.J. Beyersdorf, Y. Choi, T.B. Ryerson, J.L. Jimenez, P. Campuzano-Jost, M. Loewenstein, W. Gore. “Airborne measurements and emission estimates of greenhouse gases and other trace constituents from the 2013 California Yosemite Rim wildfire” Atmospheric Environment, 127, 293-302, 2016, doi:10.1016/j.atmosenv.2015.12.038.

M. Lin, L. W. Horowitz, O. R. Cooper, D. Tarasick, S. Conley, L. T. Iraci, B. Johnson, T. Leblanc, I. Petropavlovskikh, E. L. Yates., “Revisiting the evidence of increasing springtime ozone mixing ratios in the free troposphere over western North America” Geophysical Research Letters, 42, 8719-8728, 2015, doi: 10.1002/2015GL065311.

P. Hamill, L.T. Iraci, E.L. Yates, W. Gore, T. P. Bui, T. Tanaka, M. Loewenstein. “A new airborne platform for atmospheric research” Bulletin of American Meteorological Society, In Press, September 2015, doi: 10.1175/BAMS-D-14-00241.1.

R.Fine, M.B. Miller, E.L. Yates, L.T. Iraci, M. Sexaur Gustin. “Investigating the influence of long-range transport on surface O3 in Nevada, USA using observations from multiple measurement platforms.” Science of the Total Environment, Volumes 530-531, 493-540 2015, doi: 10.1016/j.scitotenv.2015.03.125.

E.L. Yates, L.T. Iraci, D. Austerberry, R.B. Pierce, M.C. Roby, J.M. Tadić, M. Loewenstein, W. Gore. “Characterizing the impacts of vertical transport and photochemical ozone production on an exceedance area.” Atmospheric Environment, 109, 342-350, 2015, doi: 10.1016/j.atmosenv.2014.09.002.

M.S. Johnson, E.L. Yates, L.T. Iraci, M. Loewenstein, J.M. Tadić, K.J. Wecht, S. Jeong, M.L. Fischer. “Analyzing source apportioned methane in northern California during DISCOVER-AQ-CA using airborne measurements and model simulations.” Atmospheric Environment, 99, 2014, doi: 10.1016/j.atmosenv.2014.09.068.

J. M. Tadić, M. Loewenstein, C. Frankenberg, A. Butz, M. Roby, L. T. Iraci, E. L. Yates, W. Gore, A. Kuze. “A comparison of in-situ aircraft measurements of carbon dioxide and methane to GOSAT data measured over Railroad Valley playa, Nevada, USA.” IEEE Transactions on Geoscience and Remote Sensing, 2014, doi: 10.1109/TGRS.2014.2318201.

E.L. Yates, L.T. Iraci, M.C. Roby, R.B. Pearce, M.S. Johnson, P.J. Reddy, J.M. Tadić, M. Loewenstein, W. Gore. “Airborne observations and modelling of springtime stratosphere-to-troposphere transport over California.” Atmospheric Chemistry and Physics, 2013, doi: 10.5194/acp-13-12481-2013.