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Abdi-Oskouei, M., G. Pfister, F. Flocke, N. Sobhani, P. Saide, A. Fried, D. Richter, P. Weibring, J. Walega, and G. Carmichael, 2018: Impacts of physical parameterization on prediction of ethane concentrations for oil and gas emissions in WRF-Chem. Atmos. Chem. Phys., 18, 16863-16883, doi: 10.5194/acp-18-16863-2018. Bahreini, R., R. Ahmadov, S. A. McKeen, K. T. Vu, J. H. Dingle, E. C. Apel, D. R. Blake, N. Blake, T. L. Campos, C. Cantrell, F. Flocke, A. Fried, J. B. Gilman, A. J. Hills, R. S. Hornbrook, G. Huey, L. Kaser, B. M. Lerner, R. L. Mauldin, S. Meinardi, D. D. Montzka, D. Richter, J. R. Schroeder, M. Stell, D. Tanner, J. Walega, P. Weibring, and A. Weinheimer, 2018: Sources and characteristics of summertime organic aerosol in the Colorado Front Range: perspective from measurements and WRF-Chem modeling. Atmos. Chem. Phys., 18, 8293-8312, doi: 10.5194/acp-18-8293-2018. Baidar, S., N. Kille, I. Ortega, R. Sinreich, D. Thomson, J. Hannigan, and R. Volkamer, 2016: Development of a digital mobile solar tracker. Atmospheric Measurement Techniques, 9(3), 963–972, doi: 10.5194/amt-9-963-2016. Baier, B., W. Brune, D. Miller, D. Blake, R. Long, A. Wisthaler, C. Cantrell, A. Fried, B. Heikes, S. Brown, E. McDuffie, F. Flocke, E. Apel, L. Kaser, and A. Weinheimer, 2017: Higher measured than modeled ozone production at increased NOx levels in the Colorado Front Range, Atmos. Chem. Phys. Discuss., 17, 11273–11292, doi: 10.5194/acp-17-11273-2017. Battye, W. H., C. D. Bray, V. P. Aneja, D. Tong, P. Lee, and Y. Tang, 2016: Evaluating ammonia (NH3) predictions in the NOAA National Air Quality Forecast Capability (NAQFC) using in situ aircraft, ground-level, and satellite measurements from the DISCOVER-AQ Colorado campaign. Atmospheric Environment, 140, 342–351, doi: 10.1016/j.atmosenv.2016.06.021. Benedict, K. B., A. J. Prenni, A. P. Sullivan, A. R. Evanoski-Cole, E. V. Fischer, S. Callahan, B. C. Sive, Y. Zhou, B. A. Schichtel, and J. L. Collett Jr, 2018: Impact of Front Range sources on reactive nitrogen concentrations and deposition in Rocky Mountain National Park. PeerJ, 6, e4759, doi: 10.7717/peerj.4759. Benedict, K. B., Prenni, A. J., El-Sayed, M. M. H., Hecobian, A., Zhou, Y., Gebhart, K. A., Sive, B. C., Schichtel, B. A., and Collett, J. L., 2020: Volatile organic compounds and ozone at four national parks in the southwestern United States, Atmos. Environ., 239, 10.1016/j.atmosenv.2020.117783. Benedict, K. B., Y. Zhou, B. C. Sive, A. J. Prenni, K. A. Gebhart, E. V. Fischer, A. Evanoski-Cole, A. P. Sullivan, S. Callahan, B. A. Schichtel, H. Mao, Y. Zhou, and J. L. Collett Jr., 2019: Volatile organic compounds and ozone in Rocky Mountain National Park during FRAPPÉ. Atmospheric Chemistry and Physics, 19, 499–521, doi: 10.5194/acp-19-499-2019. Cheadle, L. C., S. J. Oltmans, G. Petron, R. C. Schnell, E. J. Mattson, S. C. Herndon, A. M. Thompson, D. R. Blake, and A. McClure-Begley, 2017: Surface ozone in the Colorado northern Front Range and the influence of oil and gas development during FRAPPE/DISCOVER-AQ in summer 2014. Elem. Sci. Anth., 5, p.61., doi: 10.1525/elementa.254. Chen, X., D. B. Millet, H. B. Singh, A. Wisthaler, E. C. Apel, E. L. Atlas, D. R. Blake, I. Bourgeois, S. S. Brown, J. D. Crounse, J. A. de Gouw, F. M. Flocke, A. Fried, B. G. Heikes, R. S. Hornbrook, T. Mikoviny, K.-E. Min, M. Müller, J. A. Neuman, D. W. O'Sullivan, J. Peischl, G. G. Pfister, D. Richter, J. M. Roberts, T. B. Ryerson, S. R. Shertz, C. R. Thompson, V. Treadaway, P. R. Veres, J. Walega, C. Warneke, R. A. Washenfelder, P. Weibring, and B. Yuan, 2019: On the sources and sinks of atmospheric VOCs: an integrated analysis of recent aircraft campaigns over North America. Atmos. Chem. Phys., 19, 9097–9123, doi: 10.5194/acp-19-9097-2019. Chin, A., Simon, G. L., Anthamatten, P., Kelsey, K. C., Crawford, B. R., and Weaver, A. J, 2020.: Pandemics and the future of human-landscape interactions, Anthropocene, 31, 10.1016/j.ancene.2020.100256. Dingle, J. H., K. Vu, R. Bahreini, E. C. Apel, T. L. Campos, F. Flocke, A. Fried, S. Herndon, A. J. Hills, R. S. Hornbrook, G. Huey, L. Kaser, D. D. Montzka, J. B. Nowak, M. Reeves, D. Richter, J. R. Roscioli, S. Shertz, M. Stell, D. Tanner, G. Tyndall, J. Walega, P. Weibring, and A. Weinheimer, 2016: Aerosol optical extinction during the Front Range Air Pollution and Photochemistry Éxperiment (FRAPPÉ) 2014 summertime field campaign, Colorado, USA. Atmos. Chem. Phys., 16, 11207–11217, doi: 10.5194/acp-16-11207-2016. Duvall, R. M., R. W. Long, M. R. Beaver, K. G. Kronmiller, M. L. Wheeler, and J. J. Szykman, 2016: Performance Evaluation and Community Application of Low-Cost Sensors for Ozone and Nitrogen Dioxide. Sensors, 16, 1698, doi: 10.3390/s16101698. Ebben, C. J., T. L. Sparks, P. J. Wooldridge, T. L. Campos, C. A. Cantrell, R. L. Mauldin, A. J. Weinheimer, and R. C. Cohen, 2017: Evolution of NOx in the Denver Urban Plume during the Front Range Air Pollution and Photochemistry Experiment. Atmos. Chem. Phys. Discuss, doi: 10.5194/acp-2017-671, in review. Eilerman, S. J., J. Peischl, J. A. Neuman, T. B. Ryerson, K. C. Aikin, M. W. Holloway, M. A. Zondlo, L. M. Golston, D. Pan, C. Floerchinger, and Scott Herndon, 2016: Characterization of Ammonia, Methane, and Nitrous Oxide Emissions from Concentrated Animal Feeding Operations in Northeastern Colorado. Environmental Science & Technology, 50 (20), 10885-10893, doi: 10.1021/acs.est.6b02851. Flocke, F., G. Pfister, J. H. Crawford, K. E. Pickering, G. Pierce, D. Bon, and P. Reddy, 2020: Air Quality in the Northern Colorado Front Range Metro Area: The Front Range Air Pollution and Photochemistry Éxperiment (FRAPPÉ). Journal of Geophysical Research: Atmospheres, 125, e2019JD031197, doi: 10.1029/2019JD031197. Flynn, C. M., K. E. Pickering, J. H. Crawford, A. J. Weinheimer, G. Diskin, K. L. Thornhill, C. Loughner, P. Lee, and S. A. Strode, 2016: Variability of O3 and NO2 profile shapes during DISCOVER-AQ: Implications for satellite observations and comparisons to model-simulated profiles. Atmospheric Environment, 147, 133-156, doi: 10.1016/j.atmosenv.2016.09.068. Fukami, C. S., A. P. Sullivan, S. R. Fulgham, T. Murschell, T. Borch, J. N. Smith, and D. K. Farmer, 2016: Technical note: An improved approach to determining background aerosol concentrations with PILS sampling on aircraft. Atmospheric Environment, 136, 16-20, doi: 10.1016/j.atmosenv.2016.04.005. Golston, L. M., Pan, D., Sun, K., Tao, L., Zondlo, M. A., Eilerman, S. J., Peischl, J., Neuman, J. A., and Floerchinger, C., 2020: Variability of Ammonia and Methane Emissions from Animal Feeding Operations in Northeastern Colorado, Environ. Sci. Technol, 54, 11015-11024, 10.1021/acs.est.0c00301. Gordon, T. D., N. L. Wagner, M. S. Richardson, D. C. Law, D. Wolfe, E. W. Eloranta, C. A. Brock, F. Erdesz, and D. M. Murphy, 2015: Design of a Novel Open-Path Aerosol Extinction Cavity Ringdown Spectrometer. Aerosol Science and Technology, 49(9), 717–726, doi: 10.1080/02786826.2015.1066753. Halliday, H. S., A. M. Thompson, A. Wisthaler, D. R. Blake, R. S. Hornbrook, T. Mikoviny, M. Müller, P. Eichler, E. C. Apel, and A. J. Hills, 2016: Atmospheric benzene observations from oil and gas production in the Denver-Julesburg Basin in July and August 2014. Journal of Geophysical Research: Atmospheres, 121, 11,055-11,074, doi: 10.1002/2016jd025327. Kaser, L., E. G. Patton, G. G. Pfister, A. J. Weinheimer, D. D. Montzka, F. Flocke, A. M. Thompson, R. M. Stauffer, and H. S. Halliday, 2017: The effect of entrainment through atmospheric boundary layer growth on observed and modeled surface ozone in the Colorado Front Range. J. Geophys. Res. Atmos., 122, 6075–6093, doi: 10.1002/2016JD026245. Kenagy, H. S., Sparks, T. L., Wooldridge, P. J., Weinheimer, A. J., Ryerson, T. B., Blake, D. R., Hornbrook, R. S., Apel, E. C., and Cohen, R. C., 2020: Evidence of Nighttime Production of Organic Nitrates During SEAC(4)RS, FRAPPe, and KORUS-AQ, Geophysical Research Letters, 47, 10.1029/2020gl087860. Kille, N., S. Baidar, P. Handley, I. Ortega, R. Sinreich, O. R. Cooper, F. Hase, J. W. Hannigan, G. Pfister, and R. Volkamer, 2017: The CU mobile Solar Occultation Flux instrument: structure functions and emission rates of NH3, NO2 and C2H6. Atmos. Meas. Tech., 10, 373–392, doi: 10.5194/amt-10-373-2017. Lindaas, J., D. K. Farmer, I. B. Pollack, A. Abeleira, F. Flocke, R. Roscioli, S. Herndon, and E. V. Fischer 2017: The impact of aged wildfire smoke on atmospheric composition and ozone in the Colorado Front Range in summer 2015. Atmos. Chem. Phys., 17, 10691–10707, doi: 10.5194/acp-17-10691-2017. Lyu, C. M., Capps, S. L., Kurashima, K., Henze, D. K., Pierce, G., Hakami, A., Zhao, S. L., Resler, J., Carmichael, G. R., Sandu, A., Russell, A. G., Chai, T. F., and Milford, J., 2021: Evaluating oil and gas contributions to ambient nonmethane hydrocarbon mixing ratios and ozone-related metrics in the Colorado Front Range, Atmos. Environ., 246, 10.1016/j.atmosenv.2020.118113. Mattila, J. M., P. Brophy, J. Kirkland, S. Hall, K. Ullmann, E. V. Fischer, S. Brown, E. McDuffie, A. Tevlin, and D. K. Farmer, 2018: Tropospheric sources and sinks of gas-phase acids in the Colorado Front Range. Atmos. Chem. Phys., 18, 12315–12327, doi: 10.5194/acp-18-12315-2018. McDuffie, E. E., P. M. Edwards, J. B. Gilman, B. M. Lerner, W. P. Dubé, M. Trainer, D. E. Wolfe, W. M. Angevine, J. deGouw, E. J. Williams, A. G. Tevlin, J. G. Murphy, E. V. Fischer, S. McKeen, T. B. Ryerson, J. Peischl, J. S. Holloway, K. Aikin, A. O. Langford, C. J. Senff, R. J. Alvarez II, S. R. Hall, K. Ullmann, K. O. Lantz, and S. S. Brown, 2016: Influence of oil and gas emissions on summertime ozone in the Colorado Northern Front Range. J. Geophys. Res. Atmos., 121(14), 8712–8729, doi: 10.1002/2016jd025265. McKenzie, L. M., B. Blair, J. Hughes, W. B. Allshouse, N. J. Blake, D. Helmig, P. Milmoe, H. Halliday, D. R. Blake, and J. L. Adgate, 2018: Ambient Nonmethane Hydrocarbon Levels Along Colorado’s Northern Front Range: Acute and Chronic Health Risks. Environmental Science & Technology, 52 (8), 4514-4525, doi: 10.1021/acs.est.7b05983. Newsom, R. K., D. D. Turner, R. Lehtinen, C. Münkel, J. Kallio, & R. Roininen, 2020: Evaluation of a Compact Broadband Differential Absorption Lidar for Routine Water Vapor Profiling in the Atmospheric Boundary Layer. Journal of Atmospheric and Oceanic Technology, 37(1), 47-65, doi: 10.1175/JTECH-D-18-0102.1. Oltmans, S. J., L. C. Cheadle, B. J. Johnson, R. C. Schnell, D. Helmig, A. M. Thompson, P. Cullis, E. Hall, A. Jordan, C. Sterling, A. McClure-Begley, J. T. Sullivan, T. J. McGee, and D. Wolfe, 2019: Boundary layer ozone in the Northern Colorado Front Range in July–August 2014 during FRAPPE and DISCOVER-AQ from vertical profile measurements. Elem. Sci. Anth., 7(1), p.6., doi: 10.1525/elementa.345. Pfister, G. G., P. J. Reddy, M. C. Barth, F. F. Flocke, A. Fried, S. C. Herndon, B. C. Sive, J. T. Sullivan, A. M. Thompson, T. I. Yacovitch, A. J. Weinheimer, and A. Wisthaler, 2017: Using Observations and Source‐Specific Model Tracers to Characterize Pollutant Transport During FRAPPÉ and DISCOVER‐AQ. Journal of Geophysical Research: Atmospheres, 122, 10,510–10,538, doi: 10.1002/2017JD027257. Pfister, G., C.‐T. Wang, M. Barth, F. Flocke, W. Vizuete, and Stacy Walters, 2019: Chemical Characteristics and Ozone Production in the Northern Colorado Front Range. Journal of Geophysical Research: Atmospheres, 124, 13397–13419, doi: 10.1029/2019JD030544. Richter, D., P. Weibring, J. G. Walega, A. Fried, S. M. Spuler, and M. S. Taubman, 2015: Compact highly sensitive multi-species airborne mid-IR spectrometer. Appl. Phys. B, 119(1), 119-131, doi: 10.1007/s00340-015-6038-8. Schroeder, J. R., J. H. Crawford, A. Fried, J. Walega, A. Weinheimer, A. Wisthaler, M. Müller, T. Mikoviny, G. Chen, M. Shook, D. R. Blake, and G. S. Tonnesen, 2017: New insights into the column CH2O/NO2 ratio as an indicator of near‐surface ozone sensitivity. J. Geophys. Res. Atmos., 122, 8885–8907, doi: 10.1002/2017JD026781. Schroeder, J. R., J. H. Crawford, A. Fried, J. Walega, A. Weinheimer, A. Wisthaler, M. Müller, T. Mikoviny, G. Chen, M. Shook, D. R. Blake, G. Diskin, M. Estes, A. M. Thompson, B. L. Lefer, R. Long, and E. Mattson, 2016: Formaldehyde column density measurements as a suitable pathway to estimate near‐surface ozone tendencies from space. J. Geophys. Res. Atmos., 121, 13,088–13,112, doi: 10.1002/2016JD025419. Spuler, S. M., K. S. Repasky, B. Morley, D. Moen, M. Hayman, and A. R. Nehrir, 2015: Field-deployable diode-laser-based differential absorption lidar (DIAL) for profiling water vapor. Atmospheric Measurement Techniques, 8(3), 1073-1087, doi: 10.5194/amt-8-1073-2015. Sullivan, J. T., T. J. McGee, A. M. Thompson, R. B. Pierce, G. K. Sumnicht, L. W. Twigg, E. Eloranta, and R. M. Hoff, 2015: Characterizing the lifetime and occurrence of stratospheric-tropospheric exchange events in the rocky mountain region using high-resolution ozone measurements. J. Geophys. Res. Atmos., 120(24), 12410–12424, doi: 10.1002/2015jd023877. Sullivan, J. T., T. J. McGee, A. O. Langford, R. J. Alvarez, C. J. Senff, P. J. Reddy, A. M. Thompson, L. W. Twigg, G. K. Sumnicht, P. Lee, A. Weinheimer, C. Knote, R. W. Long, and R. M. Hoff, 2016: Quantifying the contribution of thermally driven recirculation to a high-ozone event along the Colorado Front Range using lidar. Journal of Geophysical Research: Atmospheres, 121(17), 10,377–10,390, doi: 10.1002/2016jd025229. Sun, K., L. Tao, D. J. Miller, D. Pan, L. M. Golston, M. A. Zondlo, R. J. Griffin, H. W. Wallace, Y. J. Leong, M. M. Yang, Y. Zhang, D. L. Mauzerall, and T. Zhu, 2017: Vehicle Emissions as an Important Urban Ammonia Source in the United States and China. Environmental Science & Technology, 51 (4), 2472-2481, doi: 10.1021/acs.est.6b02805. Szykman, J. J., R. W. Long, R. M. Duvall, T. Knepp, M. R. Beaver, K. Cavender, R. Clarke, and E. Olsen, 2016: The Use of Lidar Technology for Measuring Mixing Heights under the Photochemical Assessment Monitoring Stations (PAMS) Program. The Magazine for Environmental Managers, 1-7. Tevlin, A. G., Y. Li, J. L. Collett, E. E. McDuffie, E. V. Fischer, and J. G. Murphy, 2017: Tall tower vertical profiles and diurnal trends of ammonia in the Colorado Front Range. Journal of Geophysical Research: Atmospheres, 122, 12,468–12,487, doi: 10.1002/2017JD026534. Townsend-Small, A., E. C. Botner, K. L. Jimenez, J. R. Schroeder, N. J. Blake, S. Meinardi, D. R. Blake, B. C. Sive, D. M. Bon, J. H. Crawford, G. Pfister, and F. M. Flocke, 2016: Using stable isotopes of hydrogen to quantify biogenic and thermogenic atmospheric methane sources: A case study from the Colorado Front Range. Geophys. Res. Lett., 43, 11,462–11,471, doi: 10.1002/2016GL071438. Treadaway, V., B. G. Heikes, A. S. McNeill, I. K. C. Silwal, and D. W. O'Sullivan, 2018: Measurement of formic acid, acetic acid and hydroxyacetaldehyde, hydrogen peroxide, and methyl peroxide in air by chemical ionization mass spectrometry: airborne method development. Atmos. Meas. Tech., 11, 1901–1920, doi: 10.5194/amt-11-1901-2018. Valerino, M. J., J. J. Johnson, J. Izumi, D. Orozco, R. M. Hoff, R. Delgado, and C. J. Hennigan, 2017: Sources and composition of PM2.5 in the Colorado Front Range during the DISCOVER‐AQ study. J. Geophys. Res. Atmos., 122, 566–582, doi: 10.1002/2016JD025830. Vu, K. T., J. H. Dingle, R. Bahreini, P. J. Reddy, E. C. Apel, T. L. Campos, J. P. DiGangi, G. S. Diskin, A. Fried, S. C. Herndon, A. J. Hills, R. S. Hornbrook, G. Huey, L. Kaser, D. D. Montzka, J. B. Nowak, S. E. Pusede, D. Richter, J. R. Roscioli, G. W. Sachse, S. Shertz, M. Stell, D. Tanner, G. S. Tyndall, J. Walega, P. Weibring, A. J. Weinheimer, G. Pfister, and F. Flocke, 2016: Impacts of the Denver Cyclone on regional air quality and aerosol formation in the Colorado Front Range during FRAPPÉ 2014. Atmos. Chem. Phys., 16, 12039–12058, doi: 10.5194/acp-16-12039-2016. Wang, L., M. J. Newchurch, R. J. Alvarez II, T. A. Berkoff, S. S. Brown, W. Carrion, R. J. De Young, B. J. Johnson, R. Ganoe, G. Gronoff, G. Kirgis, S. Kuang, A. O. Langford, T. Leblanc, E. E. McDuffie, T. J. McGee, D. Pliutau, C. J. Senff, J. T. Sullivan, G. Sumnicht, L. W. Twigg, and A. J. Weinheimer, 2017: Quantifying TOLNet ozone lidar accuracy during the 2014 DISCOVER-AQ and FRAPPÉ campaigns. Atmos. Meas. Tech., 10, 3865–3876, doi: 10.5194/amt-10-3865-2017. Wild, R. J., W. P. Dubé, K. C. Aikin, S. J. Eilerman, J. A. Neuman, J. Peischl, T. B. Ryerson, and S. S. Brown, 2017: On-road measurements of vehicle NO2/NOx emission ratios in Denver, Colorado, USA. Atmospheric Environment, 148, 182-189, doi: 10.1016/j.atmosenv.2016.10.039. Zaragoza, J., S. Callahan, E. E. McDuffie, J. Kirkland, P. Brophy, L. Durrett, D. K. Farmer, Y. Zhou, B. Sive, F. Flocke, G. Pfister, C. Knote, A. Tevlin, J. Murphy, and E. V. Fischer, 2017: Observations of acyl peroxy nitrates during the Front Range Air Pollution and Photochemistry Éxperiment (FRAPPÉ). Journal of Geophysical Research: Atmospheres, 122, 12416–12432, doi: 10.1002/2017JD027337.