Articles | Volume 16, issue 15
Atmos. Chem. Phys., 16, 9579–9590, 2016
https://doi.org/10.5194/acp-16-9579-2016
Atmos. Chem. Phys., 16, 9579–9590, 2016
https://doi.org/10.5194/acp-16-9579-2016

Research article 02 Aug 2016

Research article | 02 Aug 2016

Hydroxyl radical in/on illuminated polar snow: formation rates, lifetimes, and steady-state concentrations

Zeyuan Chen et al.

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Cited articles

Abbatt, J., Oldridge, N., Symington, A., Chukalovskiy, V., McWhinney, R. D., Sjostedt, S., and Cox, R. A.: Release of Gas-Phase Halogens by Photolytic Generation of OH in Frozen Halide-Nitrate Solutions: An Active Halogen Formation Mechanism?, J. Phys. Chem. A, 114, 6527–6533, 2010.
Anastasio, C. and Jordan, A. L.: Photoformation Of Hydroxyl Radical And Hydrogen Peroxide In Aerosol Particles From Alert, Nunavut: Implications For Aerosol And Snowpack Chemistry In The Arctic, Atmos. Environ., 38, 1153–1166, 2004.
Anastasio, C. and McGregor, K. G.: Chemistry Of Fog Waters In California's Central Valley: 1. In Situ Photoformation Of Hydroxyl Radical And Singlet Molecular Oxygen, Atmos. Environ., 35, 1079–1089, 2001.
Anastasio, C. and Robles, T.: Light Absorption By Soluble Chemical Species In Arctic And Antarctic Snow, J. Geophys. Res.-Atmos., 112, D24304, https://doi.org/10.1029/2007jd008695, 2007.
Anastasio, C., Galbavy, E. S., Hutterli, M. A., Burkhart, J. F., and Friel, D. K.: Photoformation Of Hydroxyl Radical On Snow Grains At Summit, Greenland, Atmos. Environ., 41, 5110–5121, 2007.
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Short summary
We made the first measurements of the concentrations of hydroxyl radical (OH), a dominant environmental oxidant, in snow grains. Concentrations of OH in snow at Summit, Greenland, are comparable to values reported for midlatitude cloud and fog drops, even though impurity levels in the snow are much lower. At these concentrations, the lifetimes of organics and bromide in Summit snow are approximately 3 days and 7 h, respectively, suggesting that OH is a major oxidant for both species.
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