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Blake, N. J., D. R. Blake, B. C. Sive, A. S. Katzenstein, S. Meinardi, O. W. Wingenter, E. L. Atlas, F. Flocke, B. A. Ridley, and F. S. Rowland, 2003: The seasonal evolution of NMHCs and light alkyl nitrates at middle to high northern latitudes during TOPSE. J. Geophys. Res., 108, 8359, doi: 10.1029/2001JD001467. Browell, E. V., J. W. Hair, C. F. Butler, W. B. Grant, R. J. DeYoung, M. A. Fenn, V. G. Brackett, M. B. Clayton, L. A. Brasseur, D. B. Harper, B. A. Ridley, A. A. Klonecki, P. G. Hess, L. K. Emmons, X. Tie, E. L. Atlas, C. A. Cantrell, A. J. Wimmers, D. R. Blake, M. T. Coffey, J. W. Hannigan, J. E. Dibb, R. W. Talbot, F. Flocke, A. J. Weinheimer, A. Fried, B. Wert, J. A. Snow, and B. L. Lefer, 2003: Ozone, aerosol, potential vorticity, and trace gas trends observed at high‐latitudes over North America from February to May 2000. J. Geophys. Res., 108, 8369, doi: 10.1029/2001JD001390. Cantrell, C. A., G. D. Edwards, S. Stephens, L. Mauldin, E. Kosciuch, M. Zondlo, and F. Eisele, 2003: Peroxy radical observations using chemical ionization mass spectrometry during TOPSE. J. Geophys. Res., 108, 8371, doi: 10.1029/2002JD002715. Cantrell, C. A., L. Mauldin, M. Zondlo, F. Eisele, E. Kosciuch, R. Shetter, B. Lefer, S. Hall, T. Campos, B. Ridley, J. Walega, A. Fried, B. Wert, F. Flocke, A. Weinheimer, J. Hannigan, M. Coffey, E. Atlas, S. Stephens, B. Heikes, J. Snow, D. Blake, N. Blake, A. Katzenstein, J. Lopez, E. V. Browell, J. Dibb, E. Scheuer, G. Seid, and R. Talbot, 2003: Steady state free radical budgets and ozone photochemistry during TOPSE. J. Geophys. Res., 108, 8361, doi: 10.1029/2002JD002198. Dibb, J. E., R. W. Talbot, E. Scheuer, G. Seid, L. DeBell, B. Lefer, and B. Ridley, 2003: Stratospheric influence on the northern North American free troposphere during TOPSE: 7Be as a stratospheric tracer. J. Geophys. Res., 108, 8363, doi: 10.1029/2001JD001347. Emmons, L. K., P. Hess, A. Klonecki, X. Tie, L. Horowitz, J.‐F. Lamarque, D. Kinnison, G. Brasseur, E. Atlas, E. Browell, C. Cantrell, F. Eisele, R. L. Mauldin, J. Merrill, B. Ridley, and R. Shetter, 2003: Budget of tropospheric ozone during TOPSE from two chemical transport models. J. Geophys. Res., 108, 8372, doi: 10.1029/2002JD002665. Evans, M. J., D. J. Jacob, E. Atlas, C. A. Cantrell, F. Eisele, F. Flocke, A. Fried, R. L. Mauldin, B. A. Ridley, B. Wert, R. Talbot, D. Blake, B. Heikes, J. Snow, J. Walega, A. J. Weinheimer, and J. Dibb, 2003: Coupled evolution of BrOx‐ClOx‐HOx‐NOx chemistry during bromine‐catalyzed ozone depletion events in the arctic boundary layer. J. Geophys. Res., 108, 8368, doi: 10.1029/2002JD002732. Flocke, F. M., Weinheimer, A. J., Swanson, A. L., Roberts, J. M., Schmitt, R., & Shertz, S. (2005). On the Measurement of PANs by Gas Chromatography and Electron Capture Detection. J Atmos Chem, 52(1), 19-43. doi:10.1007/s10874-005-6772-0 Fried, A., Y. Wang, C. Cantrell, B. Wert, J. Walega, B. Ridley, E. Atlas, R. Shetter, B. Lefer, M. T. Coffey, J. Hannigan, D. Blake, N. Blake, S. Meinardi, B. Talbot, J. Dibb, E. Scheuer, O. Wingenter, J. Snow, B. Heikes, and D. Ehhalt, 2003: Tunable diode laser measurements of formaldehyde during the TOPSE 2000 study: Distributions, trends, and model comparisons. J. Geophys. Res., 108, 8365, doi: 10.1029/2002JD002208. Klonecki, A., P. Hess, L. Emmons, L. Smith, J. Orlando, and D. Blake, 2003: Seasonal changes in the transport of pollutants into the Arctic troposphere‐model study. J. Geophys. Res., 108, 8367, doi: 10.1029/2002JD002199. Laepple, T., M. G. Schultz, J. F. Lamarque, S. Madronich, R. E. Shetter, B. L. Lefer, and E. Atlas, 2005: Improved albedo formulation for chemistry transport models based on satellite observations and assimilated snow data and its impact on tropospheric photochemistry. J. Geophys. Res., 110, D11308, doi: 10.1029/2004JD005463. Liang, Q., J. M. Rodriguez, A. R. Douglass, J. H. Crawford, J. R. Olson, E. Apel, H. Bian, D. R. Blake, W. Brune, M. Chin, P. R. Colarco, A. da Silva, G. S. Diskin, B. N. Duncan, L. G. Huey, D. J. Knapp, D. D. Montzka, J. E. Nielsen, S. Pawson, D. D. Riemer, A. J. Weinheimer, and A. Wisthaler, 2011: Reactive nitrogen, ozone and ozone production in the Arctic troposphere and the impact of stratosphere-troposphere exchange. Atmos. Chem. Phys., 11, 13181–13199, doi: 10.5194/acp-11-13181-2011. Mauldin III, R. L., C. A. Cantrell, M. A. Zondlo, E. Kosciuch, B. A. Ridley, R. Weber, and F. E. Eisele, 2003: Measurements of OH, H2SO4, and MSA during Tropospheric Ozone Production About the Spring Equinox (TOPSE). J. Geophys. Res., 108, 8366, doi: 10.1029/2002JD002295. Murphy, J. G., J. A. Thornton, P. J. Wooldridge, D. A. Day, R. S. Rosen, C. Cantrell, R. E. Shetter, B. Lefer, and R. C. Cohen, 2004: Measurements of the sum of HO2NO2 and CH3O2NO2 in the remote troposphere. Atmos. Chem. Phys., 4, 377–384, doi: 10.5194/acp-4-377-2004. Olson, J. R., Crawford, J. H., Brune, W., Mao, J., Ren, X., Fried, A., ... Wisthaler, A. (2012). An analysis of fast photochemistry over high northern latitudes during spring and summer using in-situ observations from ARCTAS and TOPSE. Atmos. Chem. Phys., 12(15), 6799-6825. doi:10.5194/acp-12-6799-2012 Ridley, B. A., E. L. Atlas, D. D. Montzka, E. V. Browell, C. A. Cantrell, D. R. Blake, N. J. Blake, L. Cinquini, M. T. Coffey, L. K. Emmons, R. C. Cohen, R. J. DeYoung, J. E. Dibb, F. L. Eisele, F. M. Flocke, A. Fried, F. E. Grahek, W. B. Grant, J. W. Hair, J. W. Hannigan, B. J. Heikes, B. L. Lefer, R. L. Mauldin, J. L. Moody, R. E. Shetter, J. A. Snow, R. W. Talbot, J. A. Thornton, J. G. Walega, A. J. Weinheimer, B. P. Wert, and A. J. Wimmers, 2003: Ozone depletion events observed in the high latitude surface layer during the TOPSE aircraft program. J. Geophys. Res., 108( D4), 8356, doi: 10.1029/2001JD001507. Ridley, B. A., T. Zeng, Y. Wang, E. L. Atlas, E. V. Browell, P. G. Hess, J. J. Orlando, K. Chance, and A. Richter, 2007: An ozone depletion event in the sub-arctic surface layer over Hudson Bay, Canada. J. Atmos. Chem., 57, 255–280 (2007), doi: 10.1007/s10874-007-9072-z. Scheuer, E., R. W. Talbot, J. E. Dibb, G. K. Seid, L. DeBell, and B. Lefer, 2003: Seasonal distributions of fine aerosol sulfate in the North American Arctic basin during TOPSE. J. Geophys. Res., 108, 8370, doi: 10.1029/2001JD001364. Snow, J. A., B. G. Heikes, J. T. Merrill, A. J. Wimmers, J. L. Moody, and C. A. Cantrell, 2003: Winter‐spring evolution and variability of HOx reservoir species, hydrogen peroxide, and methyl hydroperoxide, in the northern middle to high latitudes. J. Geophys. Res., 108, 8362, doi: 10.1029/2002JD002172. Snow, J. A., Heikes, B. G., Shen, H., O'Sullivan, D. W., Fried, A., & Walega, J. (2007). Hydrogen peroxide, methyl hydroperoxide, and formaldehyde over North America and the North Atlantic. Journal of Geophysical Research, 112(D12). doi:10.1029/2006jd007746 Stroud, C., S. Madronich, E. Atlas, C. Cantrell, A. Fried, B. Wert, B. Ridley, F. Eisele, L. Mauldin, R. Shetter, B. Lefer, F. Flocke, A. Weinheimer, M. Coffey, B. Heikes, R. Talbot, and D. Blake, 2004: Photochemistry in the Arctic Free Troposphere: Ozone Budget and Its Dependence on Nitrogen Oxides and the Production Rate of Free Radicals. Journal of Atmospheric Chemistry, 47, 107–138 (2004), doi: 10.1023/B:JOCH.0000021026.71906.e1. Tie, X., L. Emmons, L. Horowitz, G. Brasseur, B. Ridley, E. Atlas, C. Stround, P. Hess, A. Klonecki, S. Madronich, R. Talbot, and J. Dibb, 2003: Effect of sulfate aerosol on tropospheric NOx and ozone budgets: Model simulations and TOPSE evidence. J. Geophys. Res., 108, 8364, doi: 10.1029/2001JD001508. Wang, Y., B. Ridley, A. Fried, C. Cantrell, D. Davis, G. Chen, J. Snow, B. Heikes, R. Talbot, J. Dibb, F. Flocke, A. Weinheimer, N. Blake, D. Blake, R. Shetter, B. Lefer, E. Atlas, M. Coffey, J. Walega, and B. Wert, 2003: Springtime photochemistry at northern mid and high latitudes. J. Geophys. Res., 108, 8358, doi: 10.1029/2002JD002227. Wang, Y., C. Shim, N. Blake, D. Blake, Y. Choi, B. Ridley, J. Dibb, A. Wimmers, J. Moody, F. Flocke, A. Weinheimer, R. Talbot, and E. Atlas, 2003: Intercontinental transport of pollution manifested in the variability and seasonal trend of springtime O3 at northern middle and high latitudes. J. Geophys. Res., 108, 4683, doi: 10.1029/2003JD003592. Wang, Y., Y. Choi, T. Zeng, B. Ridley, N. Blake, D. Blake, and F. Flocke, 2006: Late‐spring increase of trans‐Pacific pollution transport in the upper troposphere. Geophys. Res. Lett., 33, L01811, doi: 10.1029/2005GL024975. Weber, R. J., D. Orsini, B. Wang, E. Scheuer, R. W. Talbot, J. E. Dibb, G. K. Seid, L. DeBell, R. L. Mauldin, E. Kosciuch, C. Cantrell, and F. Eisele, 2003: Investigations into free tropospheric new particle formation in the central Canadian arctic during the winter/spring transition as part of TOPSE. J. Geophys. Res., 108, 8357, doi: 10.1029/2002JD002239. Wimmers, A. J., J. L. Moody, E. V. Browell, J. W. Hair, W. B. Grant, C. F. Butler, M. A. Fenn, C. C. Schmidt, J. Li, and B. A. Ridley, 2003: Signatures of tropopause folding in satellite imagery. J. Geophys. Res., 108, 8360, doi: 10.1029/2001JD001358. Zeng, T., Y. Wang, K. Chance, E. V. Browell, B. A. Ridley, and E. L. Atlas, 2003: Widespread persistent near‐surface ozone depletion at northern high latitudes in spring. Geophys. Res. Lett., 30, 2298, doi: 10.1029/2003GL018587. Zeng, T., Y. Wang, K. Chance, N. Blake, D. Blake, and B. Ridley, 2006: Halogen‐driven low‐altitude O3 and hydrocarbon losses in spring at northern high latitudes. J. Geophys. Res., 111, D17313, doi: 10.1029/2005JD006706.