Papers submitted, in review, accepted, or in press:

He, P., B. Alexander, K. Hui, and Z. Xie, Isotopic constraints on the formation mechanisms of sulfate aerosols in the summer Arctic marine boundary layer, submitted to J. Geophys. Res. (2021).

Kirpes, R.M., Z. Lei, M. Fraund, M.J. Gunsch, N.W. May, T.E. Barrett, C.E. Moffett, A. Schauer, B. Alexander, L.M. Upchurch, S. China, P.K. Quinn, R.C. Moffet, A. Laskin, R.J. Sheesley, K.A. Pratt, and A.P. Ault, Encapsulation of ammonium sulfate particles by solid organics at high relative humidity in the summertime Arctic atmosphere, in revision for PNAS (2021).

Published, peer-reviewed papers:


62. Wang, X., D.J. Jacob, W. Downs, S. Zhai, L. Zhu, V. Shah, C.D. Holmes, T. Sherwen, B. Alexander, M.J. Evans, S.D. Eastham, J.A. Neuman, P. Veres, T.K. Koenig, R. Volkamer, L.G. Huey, T.J. Bannan, C.J. Percival, B.H. Lee, and J.A. Thornton, Global tropospheric halogen (Cl, Br, I) chemistry and its impact on oxidants,  Atmos. Chem. Phys., 21, 13973-13996, doi:10.5194/acp-21-13973-2021 (2021).

61. Tilgner, Andreas, Thomas Schaefer, Becky Alexander, Mary Barth, Jeffrey L. Collett, Jr., Kathleen M. Fahey, Athanasios Nenes, Havala O. T. Pye, Hartmut Herrmann, and V. Faye McNeill, Acidity and the multiphase chemistry of atmospheric aqueous particles and clouds, Atmos. Chem. Phys., 21, 13483-13536, (2021).

60. Jiang, Z., B. Alexander, J. Savarino, J. Erbland, and L. Geng, Impacts of the photo-driven post-depositional processing on snow nitrate and its isotopes at Summit, Greenland: a model-based studyThe Cryosphere, 15, 4207-4220 (2021).

59. Zhai, S., X. Wang, J.R. McConnell, L. Geng, J. Cole-Dai, N. Chellman, T. Sherwen, R. Pound, K. Fujita, S. Hattori, J.M. Moch, L. Zhu, M.J. Evans, M. Legrand, P. Liu, D. Pasteris, Y.-C. Chan, L.T. Murray, and Becky Alexander, Anthropogenic impacts on tropospheric reactive chlorine since the preindustrialGeophys. Res. Lett. 48 (14), e2021GL093808, doi: 10.1029/2021GL093808 (2021).

58. Wang, K., S. Hattori, M. Lin, S. Ishino, B. Alexander, K. Kamezaki, N. Yoshida, and S. Kang, Isotopic constraints on atmospheric sulfate formation pathways in the Mt. Everest region, southern Tibetan Plateau,  Atmos. Chem. Phys., 21, doi: 10.5194/acp-21-8357-2021 (2021).

57. Hattori, S., Y. Iizuka, B. Alexander, S. Ishino, K. Fujita, S. Zhai, T. Sherwen, N. Oshima, R. Uemura, A. Yamada, N. Suzuki, S. Matoba, A. Tsuruta, J. Savarino, and N. Yoshida, Isotopic evidence for acidity-driven enhancement of sulfate formation after SO2 emission controlScience Adv., 7(19), eabd4610, doi:10.1126/sciadv.abd4610 (2021). UW press release.

56. Chan, Y.C., M.J. Evans, P. He, C.D. Holmes, L. Jaegle, P. Kasibhatla, X.-Y. Liu, T. Sherwen, J.A. Thornton, X. Wang, Z. Xie, S. Zhai, and B. Alexander, Heterogeneous nitrate production mechanisms in intense haze events in North China,  J. Geophys. Res., e2021JD034688, doi:10.1029/2021JD034688 (2021).

55. Winski, D., E. Osterberg, K. Kreutz, D. Ferris, J. Cole-Dai, Z. Thundercloud, J. Huang, B. Alexander, L. Jaegle, j. Kennedy, C. Larrick, E. Kahle, E. Steig, and T. Jones, Seasonally-resolved Holocene sea ice variability inferred from South Pole ice core chemistry, Geophys. Res. Lett., 48(8), E2020GL091602, doi:10.2029/2020GL091602  (2021).

54. Ishino, S., S. Hattori, M. Legrand, Q. Chen, B. Alexander, J. Shao, J. Huang, L. Jaegle, B. Jourdain, S. Preunkert, A. Yamada, N. Yoshida, and J. Savarino, Regional characteristics of atmospheric sulfate formation in East Antarctica imprinted on 17O-excess signature, J. Geophys. Res., e2020JD033583doi:10.1029/JD033583 (2021).


53. Wang, M. Q. Fu, S. Solomon, R. White and B. Alexander, Stratospheric ozone in the Last Glacial Maximum, J. Geophys. Res., 215 (21), e202JD032929, (2020).

52. Fu, Q., M. Wang, R.H. White, H. Pahlavan, B. Alexander, and J.M. Wallace, Quasi-biennial oscillation and sudden stratospheric warmings during the last glacial maximum, Atmospheres, (2020).

51. Moch, Jonathan M., Eleni Dovrou, Loretta J. Mickley, Frank N. Keutsch, Zirui Liu, Yuesi Wang, Tracy L. Dombek, Mikinori Kuwata, SriSri Hapsari Budisulistiorini, Liudongqing Yang, Stefano Decesari, Marco Paglione, Becky Alexander, Jingyuan Shao, J. William Munger, Daniel J. Jacob, Global importance of hydroxymethanesulfonate in ambient particulate matter: Implications for air quality,  J. Geophys. Res. Atmospheres, 125 (8), e2020JD032706, (2020).

50. Huang, J.; L. Jaegle, Q. Chen, B. Alexander, T. Sherwen, M. Evans, N. Theys, and S. Choi, Evaluating the impact of blowing snow sea salt aerosol on springtime BrO and O3 in the Arctic, Atmos. Chem. Phys., 20, 7335-7358, doi:10.5194/acp-20-7335-2020 (2020).

49. Pye, Havala; Athanasios Nenes, Becky Alexander, Andrew Ault, Mary Barth, Simon Clegg, Jeffrey Collett, Kathleen Fahey, Christopher Hennigan, Hartmut Herrmann, Maria Kanakidou, James Kelly, I-Ting Ku, V. Faye McNeill, Nicole Riemer, Thomas Schaefer, Guoliang Shi, Andreas Tilgner, John Walker, Tao Wang, Rodney Weber, Jia Xing, Rahul Zaveri, and Andreas Zuend, The Acidity of Atmospheric Particles and CloudsAtmos. Chem. Phys.,  20, 4809-4888, doi:10.5194/acp-20-4809-2020 (2020).

48. Alexander, B., T. Sherwen, C.D. Holmes, J.A. Fisher, Q. Chen, M.J. Evans, and P. Kasibhatla, Global inorganic nitrate production mechanisms: Comparison of a global model with nitrate isotope observationsAtmos. Chem. Phys., 20, 3859-3877 (2020).

47. Fu, Q., R.White, M. Wang, B. Alexander, S. Solomon, A. Gettelman, D. Battisti, and P. Lin, The Brewer-Dobson Circulation during the Last Glacial Maximum, Geophys. Res. Lett., 47, e2019GL086271, (2020).

46. Horowitz, H.; C.D. Holmes; A. Wright; T. Sherwen, M. Evans; J. Huang, L.  Jaeglé, Q. Chen; and B. Alexander, Effects of sea salt aerosol emissions for Marine Cloud Brightening on atmospheric chemistry: Implications for radiative forcing, Geophys. Res. Lett., 47, e2019GL085838, (2020). Among GRL’s top 10% most downloaded papers in 2020!


45. Walters, W.W., G. Michalski, J.K. Bohlke, B. Alexander, J. Savarino, and M.H. Thiemens, Assessing the seasonal dynamics of nitrate and sulfate aerosols at the South Pole utilizing stable isotopes,  J. Geophys. Res. Atmospheres, 124, doi:10.1029/2019JD030517 (2019).

44. Zhu, L., Jacob, D.J., Eastham, S.D. Sulprizio, M.P., Wang, X., Sherwen, T., Evans, M.J., Chen, Q., Alexander, B., Koenig, T.K., Volkamer, R., Huey, L.G., Le Breton, M., and Percival, C.J., Effect of sea-salt aerosol on tropospheric bromine chemistryAtmos. Chem. Phys., 19, 6497-6507doi:10.5194/acp-19-6497-2019 (2019).

43. Shao, J., Q. Chen, Y. Wang, X. Lu, P. He, Y. Sun, V. Shah, R.V. Martin, S. Philip, S. Song, Z. Xie, L. Zhang, and B. Alexander, Heterogeneous sulfate aerosol formation mechanisms during wintertime Chinese haze events: Air quality model assessment using observations of oxygen isotopes in Beijing, Atmos. Chem. Phys., 19, 6107-6123, doi:10.5194/acp-19-6107-2019, 2019. Highlighted in ACP.

42. Wang, X., Daniel Jacob, Sebastian Eastham, Melissa Sulprizio, Lei Zhu, Qianjie Chen, Becky Alexander, Tomas Sherwen, Mathew Evans, Ben Lee, Jessica Haskins, Felipe Lopez-Hilfiker, Joel Thornton, Gregory Huey, and Hong Liao, The role of chlorine in tropospheric chemistry,  Atmos. Chem. Phys.,  19, 3981-4003, doi:10.5194/acp-19-3981-2019 (2019).


41. Chen, Q., Tomás Sherwen, Mathew Evans, and Becky AlexanderDMS oxidation and sulfur aerosol formation in the marine troposphere: a focus on reactive halogen and multiphase chemistryAtmos. Chem. Phys., 18, 13617-13637, doi: 10.5194/acp-18-13617-2018 (2018).

40. Kasibhatla, P., T. Sherwen, M.J. Evans, L.J. Carpenter, C. Reed, B. Alexander, Q. Chen, M. Sulprizio, J.D. Lee, K.A. Read, W. Bloss, L.R. Crilley, W.C. Keene, A.A.P. Pzenny and A. Hodzic, Global impact of nitrate photolysis of sea-salt aerosol on NOx, OH and ozone in the marine boundary layer,  Atmos. Chem. Phys., 18, 11185-11203, doi: 10.5194/acp-18-11185-2018 (2018).

39. He, P., B. Alexander, L. Geng, X. Chi, S. Fan, H. Zhan, H. Kang, G. Zheng, Y. Cheng, H. Su, C. Liu and Z. Xie, Isotopic constraints on heterogeneous sulfate production in Beijing hazeAtmospheric Chemistry and Physics, 18, 5515-5528, doi: 10.5194/acp-18-5515-2018 (2018).


38. Chen, Q., J.A. Schmidt, V. Shah, L. Jaeglé, T. Sherwen and B. Alexander, Sulfate production by reactive bromine: Implications for the global sulfur and reactive bromine budgets, Geophys. Res. Lett., 44 (13), 7069-7078, doi: 10.1002/2017GL073812 (2017).

37. Geng, L., L.T. Murray, L.J. Mickley, P. Lin, Q. Fu, A.J. Schauer, and B. Alexander, Isotopic evidence of multiple controls on atmospheric oxidants over climate transitions,  Nature, 546, 133-136, doi:10.1038/nature22340 (2017). (Also see News and Views by Hegglin, M.I., The self-cleansing ability of prehistoric air, Nature, 543, 41-42, 2017.)


36. Zatko, M.C., J. Erbland, J. Savarino, Lei Geng, L. Easley, A,J. Schauer, T. Bates, P.K. Quinn, B. Light, D. Morison, H.D. Osthoff, S. Lyman, W. Neff, B. Yuan and B. Alexander, The magnitude of the snow-sourced reactive nitrogen flux to the boundary layer in the Uintah Basin, Utah, USAAtmos. Chem. Phys., 16, 13837-13851, doi:10.5194/acp-16-13837 (2016).

35. Chen, Q, L. Geng, J. Schmidt, Z. Xie, H. Kang, J. Dachs, J. Cole-Dai, A.J. Schauer, M. Camp, and B. Alexander, Isotopic constraints on the role of hypohalous acids in sulfate aerosol formation in the remote marine boundary layerAtmos. Chem. Phys., 16, 11433-11450, doi:10.5194/acp-16-11433-2016 (2016).

34. Zatko, M.C., L. Geng, B. Alexander, E.D. Sofen and K. Klein, The impact of snow nitrate photolysis on boundary layer chemistry and the recycling and redistribution of reactive nitrogen across Antarctica and Greenland in a global chemical transport model,  Atmos. Chem. Phys., 16, 2819-2842, doi:10.5194/acp-16-2819-2016 (2016).


33. Achakulwisut, P., L.J. Mickley, L.T. Murray, A.P.K. Tai, J.O. Kaplan and B. AlexanderUncertainties in isoprene photochemistry and emissions: Implications for the oxidative capacity of past and present atmospheres and for trends in climate forcing agents,  Atmos. Chem. Phys., 15, 7977-7998, doi:10.5194/acp-15-7977-2015 (2015).

32. Geng, L., M.C. Zatko, B. Alexander, T.J. Fudge, A.J. Schauer, L.T. Murray and L.J. Mickley, Effects of post-depositional processing on nitrogen isotopes of nitrate in the Greenland Ice Sheet Project 2 (GISP 2) ice core, Geophys. Res. Lett., 42, 5346-5354, DOI: 10.1002/2015GL064218 (2015).

31. Alexander, B. and L.J. Mickley, Paleo-perspectives on potential future changes in the oxidative capacity of the atmosphere due to climate change and anthropogenic emissions,  Curr. Pollution Rep., 1 (2), 57-69, doi:10.1007/s40726-015-0006-0 (2015).


30. Geng, L., J.H. Cole-Dai, B. Alexander, J. Savarino, A.J. Schauer, E.J. Steig, P. Lin, Q. Fu and M.C. ZatkoOn the origin of the occasional springtime nitrate concentration maximum in Greenland snow,  Atmos. Chem. Phys., 14, 13361-13376, doi:10.5194/acp-14-13361-2014  (2014).

29. Sofen, E.D., B. Alexander, E.J. Steig, M.H. Thiemens, S.A. Kunasek, H.M. Amos, A.J. Schauer, M.G. Hastings, J. Bautista, T.L. Jackson, L.E. Vogel, J.R. McConnell, D.R. Pasteris, and E.S. Saltzman, WAIS Divide ice core suggests sustained changes in the atmospheric formation pathways of sulfate and nitrate since the 19th century in the extratropical Southern HemisphereAtmos. Chem. Phys., 14, 5749-5769, doi:10.5194/acp-14-5749-2014 (2014).

28. Breider, T., L.J. Mickley, D.J. Jacob, Q. Wang, J. Fisher, R. Chang, and B. Alexander, Annual distributions and sources of Arctic aerosol components, aerosol optical depth, and aerosol absorption,  J. Geophys. Res., 119, doi:10.1002/2013JD020996 (2014).

27. Murray, L.T., L.J. Mickley, J.O. Kaplan, E.D. Sofen, M. Pfeiffer, and B. AlexanderFactors controlling variability in the oxidative capacity of the troposphere since the Last Glacial MaximumAtmos. Chem. Phys., 14, 3589-3622, doi:10.5194/acp-14-3589-2014  (2014).

26. Geng, L., B. Alexander, J. Cole-Dai, E.J. Steig, J. Savarino, E.D. Sofen and A.J. Schauer, Nitrogen isotopes in ice core nitrate linked to anthropogenic atmospheric acidity change, Proc. Nat. Acad. Sci., 111 (16), 5808-5812, doi:10.1073/pnas.1319441111 (2014).  Highlighted in this issue of PNAS (page 5755).

25. Lee, H.-M., D.K. Henze, B. Alexander and L.T. Murray, Investigating the sensitivity of surface-level nitrate seasonality in Antarctica to primary sources using a global model, Atm. Env., 89, 757-767, doi: 10.1016/j.atmosenv.2014.03.003 (2014).


24. Geng, L., A.J. Schauer, S.A. Kunasek, E.D. Sofen, J. Erbland, J. Savarino, D.J. Allman, R.S. Sletten, and B. Alexander (2013), Analysis of oxygen-17 excess of nitrate and sulfate at sub-micromole levels using the pyrolysis method, Rapid Comm. Mass Spectrom., 27: 2411-2419. doi:10.1002/rcm.6703

23. Zatko, M.C., T.C. Grenfell, B. Alexander, S.J. Doherty, J.L. Thomas and X. Yang, The influence of snow grain size and impurities on the vertical profiles of actinic flux and associated NOx emissions on the Antarctic and Greenland ice sheetsAtmos. Chem. Phys. 13, 3547-3567, doi:10.5194/acp-13-3547-2013 (2013).

22. Savarino, J., S. Morin, J. Erbland, F. Grannec, M. Patey, W. Vicars, B. Alexander and E.P. Achterberg, Isotopic composition of atmospheric nitrate in a tropical marine boundary layer, PNAS (published ahead of print), doi:10.1073/pnas.1216639110 (2013).


21. Schauer, A.J., S.A. Kunasek, E.D. Sofen, J. Erbland, J. Savarino, B. Johnson, H.M. Amos, T.L. Jackson, M.H. Thiemens, and B. Alexander, Oxygen isotope exchange with quartz during pyrolysis of silver sulfate and silver nitrate, Rapid Commun. Mass Spectrom. 26 (18), 2151-2157, doi:10.1002/rcm.6332 (2012).

20. Alexander, B., D.J. Allman, H.M. Amos, T.D. Fairlie, J. Dachs, D.A. Hegg and R.S. Sletten, Isotopic constraints on sulfate aerosol formation pathways in the marine boundary layer of the subtropical northeast Atlantic Ocean, J. Geophys. Res., 117, D06304, doi:10.1029/2011JD016773 (2012).


19. Hezel, P.J, B. Alexander, C.M. Bitz, E.J. Steig, C.D. Holmes, X. Yang and J. Sciare, Modeled methanesulfonic acid (MSA) deposition in Antarctica and its relationship to sea ice, J. Geophys. Res. 116, D23214, doi:10.1029/2011JF016383 (2011).

18. Costa, A.J., G. Michalski, A.J.Schauer, B. Alexander, Steig, E.J. and Shepson, P.B., Analysis of atmospheric inputs of nitrate to a temperate forest ecosystem from Δ17O isotope ratio measurements, Geophys. Res. Lett, 38, L15805, doi:10.1029/2011GL047539 (2011).

17. Sofen, E.D., B. Alexander, and S.A. KunasekThe impact of anthropogenic emissions on atmospheric sulfate production pathways, oxidants, and ice core Δ17O(SO42-)Atmos. Chem. Phys., 11, 3565-3578, doi:10.5194/acp-11-3565-2011 (2011).

16. Jaeglé, L., Quinn, P. K., Bates, T., Alexander, B., and Lin, J.-T.: Global distribution of sea salt aerosols: new constraints from in situ and remote sensing observationsAtmos. Chem. Phys., 11, 3137-3157, doi:10.5194/acp-11-3137-2011 (2011).

15. Gray, B., Y. Wang, D. Gu, A. Bandy, L. Mauldin, A. Clarke, B. Alexander and D.D. Davis, Sources, transport and sinks of SO2 over the equatorial Pacific during the Pacific Atmospheric Sulfur ExperimentJ. Atmos. Chem, 68 (1), 27-53, doi: 10.1007/s10874-010-9177-7 (2011). From the issue entitled “Special Issue: The Pacific Atmosphere Sulfur Experiment (PASE)”


14. Kunasek, S.A., B. Alexander, E.J. Steig, E.D. Sofen, T.L. Jackson, M.H. Thiemens, J.R. McConnel, D.J. Gleason, H.M. Amos, Sulfate sources and oxidation chemistry over the past ~230 years from sulfur and oxygen isotopes of sulfate in a West Antarctic ice core, J. Geophys. Res., 115, D18313, doi:10.1029/2010JD013846 (2010). Highlighted in Eos Vol. 91, No. 49, 7 December 2010 “Research Spotlight”

13. Thornton, J.A., J.P. Kercher, T.P. Riedel, N.L. Wagner, J. Cozic, J.S. Holloway, W.P. Dubé, G.M. Wolfe, P.K. Quinn, A.M. Middlebrook, B. Alexander, and S.S. Brown, A large atomic chlorine source inferred from mid-continental reactive nitrogen chemistry, Nature, 464, doi:10.1038/nature08905 (2010).

12. Fairlie, T.D., D.J. Jacob, J.E. Dibb, B. Alexander, M.A. Avery, A. van Donkelaar, and L. Zhang, Impact of mineral dust on nitrate, sulfate and ozone in transpacific Asian pollution plumesAtmos. Chem. Phys., 10, 3999-4012 (2010).


11. Alexander, B., M.G. Hastings, D.J. Allman, J. Dachs,, J.A. Thornton, and S.A. KunasekQuantifying atmospheric nitrate formation pathways based on a global model of the oxygen isotopic composition of atmospheric nitrateAtmos. Chem. Phys., 9, 5043-5056 (2009).

10. Alexander, B., Park, R.J., Jacob, D.J., and Gong, S., Transition metal catalyzed oxidation of atmospheric sulfur: Global implications for the sulfur budget, J. Geophys. Res. 114, D02309 (2009).

Prior to 2009

9. Kunasek, S.A., Alexander, B., E.J. Steig, M.G. Hastings, D.J. Gleason and J.C. Jarvis, Measurements and modeling of Δ17O of nitrate in snowpits from Summit, Greenland,  J. Geophys. Res., 113, D24302 (2008).

8. Heald, C.L., Jacob, D.J., Park, R.J., Alexander, B., Fairlie, T.D., Chu, D.A., Yantosca, R.M., Transpacific transport of Asian anthropogenic aerosols and its impact on surface air quality in the United States, J. Geophys. Res., 111, D14310 (2006).

7. McCabe, J.R., Savarino, J., Alexander, B., Gong, S., and Thiemens, M.H., Isotopic constraint on non-photochemical sulfate production in the Arctic winter, Geophys. Res. Lett., 33, L05810 (2006).

6. Alexander, B., Savarino, J., Lee, C.C.W., Park, R.J., Jacob, D.J., Li, Q., Thiemens, M.H., Yantosca, R.M., Sulfate formation in sea-salt aerosols: Constraints from oxygen isotopes, J. Geophys. Res. 110, D1030 (2005).

5. Alexander, B., Savarino, J., Kreutz, K., and Thiemens, M.H., Impact of preindustrial biomass burning emissions on the oxidation pathways of tropospheric sulfur and nitrogen, J. Geophys. Res., 109, D08303 (2004).  Also see: Andreae, M.O., “Atmospheric Chemistry: Fire and Ice”, Nature, 429, 713 (2004).

4. Alexander, B., Farquhar, J., Kaufman, A.J., Savarino, J, Delmas, R.J., and Thiemens, M.H., East Antarctic ice core sulfur isotope measurements over a complete glacial-interglacial cycle,  J. Geophys. Res., 108(D24), 4786 (2003).

3. Alexander, B., Savarino, J., Thiemens, M.H., and Delmas, R., “Climate driven changes of the oxidation pathways of atmospheric sulfur,” Geophys. Res. Lett., 29(14), 30 (2002).

2. Alexander, B., Vollmer, M.K., Jackson, T., Weiss, R.F., Thiemens, M.H., “Stratospheric CO2 isotopic anomalies and SF6 and CFC tracer concentrations in the Arctic polar vortex,” Geopys. Res. Lett28(21), 4103 (2001).

1. Savarino, J., Alexander, B., Darmohusodo, Vincent, Thiemens, M.H., “Sulfur and oxygen isotope analysis of sulfate at micromole levels using a pyrolysis technique in a continuous flow system”, Analytical Chemistry 73(18), 4457 (2001).

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