References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-11-12725-2011

Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008

Liao

¹ Huey

L. G.

¹ Tanner

D. J.

¹ Brooks

² Dibb

J. E.

³ Stutz

⁴ Thomas

J. L.

⁴ ⁷ Lefer

⁵ Haman

⁵ Gorham

⁶

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA

NOAA Atmospheric Turbulence and Diffusion Division, TN, USA

Climate Change Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, USA

University of California Los Angeles, Department of Atmosphere Ocean Science, Los Angeles, CA, USA

Department of Geosciences, University of Houston, TX, USA

Chemistry, University of California, Irvine, California, USA

now at: UPMC Univ. Paris 06; Université Versailles St-Quentin; CNRS/INSU, UMR 8190; LATMOS-IPSL, Paris, France

26 04 2011

11 4 12725 12762

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The Greenland Summit Halogen-HOx (GSHOX) Campaign was performed in spring~2007 and summer~2008 to investigate the impact of halogens on HOx (=OH + HO2) cycling above the Greenland Ice Sheet. Chemical species including hydroxyl and peroxy radicals (OH and HO2 + ROx), ozone (O3), nitrogen oxide (NO), nitric acid (HNO2), nitrous acid (HONO), reactive gaseous mercury (RGM), and bromine oxide (BrO) were measured during the campaign. The median midday values of HO2 + RO2 and OH concentrations observed by chemical ionization mass spectrometry (CIMS) were 2.7 × 108 molec cm−3 and 3.0 × 106 molec cm−3 in spring 2007, and 4.2 × 108 molec cm−3 and 4.1 × 106 molec cm−3 in summer~2008. A basic photochemical 0-D box model highly constrained by observations of H2O, O3, CO, CH4, NO, and J values predicted HO2 + RO2 (R = 0.90, slope = 0.87 in 2007; R = 0.79, slope = 0.96 in 2008) reasonably well and under predicted OH (R = 0.83, slope = 0.72 in 2007; R = 0.76, slope = 0.54 in 2008). Constraining the model to HONO observations did not significantly change the predictions. Including bromine chemistry in the model constrained by observations of BrO improved the correlation between observed and predicted HO2 + RO2 and OH, and brought the average hourly OH and HO2+RO2 predictions closer to the observations. These model comparisons confirmed our understanding of the dominant HOx sources and sinks in this environment and indicated that BrO impacted the OH levels at Summit. Although, significant discrepancies between observed and predicted OH could not be explained by the measured BrO. Finally, observations of enhanced RGM were found to be coincident with under prediction of OH.

References 1

Ariya, P. A., Khalizov, A., and Gidas, A.: Reactions of gaseous mercury with atomic and molecular halogens: Kinetics, product studies, and atmospheric implications, J. Phys. Chem. A, 106, 7310–7320, http://dx.doi.org/10.1021/jp020719odoi:10.1021/jp020719o, 2002.

Bloss, W. J., Lee, J. D., Heard, D. E., Salmon, R. A., Bauguitte, S. J.-B., Roscoe, H. K., and Jones, A. E.: Observations of OH and HO2 radicals in coastal Antarctica, Atmos. Chem. Phys., 7, 4171–4185, http://dx.doi.org/10.5194/acp-7-4171-2007doi:10.5194/acp-7-4171-2007, 2007.

Bloss, W. J., Camredon, M., Lee, J. D., Heard, D. E., Plane, J. M. C., Saiz-Lopez, A., Bauguitte, S. J.-B., Salmon, R. A., and Jones, A. E.: Coupling of HOx, NOx and halogen chemistry in the antarctic boundary layer, Atmos. Chem. Phys., 10, 10187–10209, http://dx.doi.org/10.5194/acp-10-10187-2010doi:10.5194/acp-10-10187-2010, 2010.

Brooks, S., Arimoto, R., Lindberg, S., and Southworth, G.: Antarctic polar plateau snow surface conversion of deposited oxidized mercury to gaseous elemental mercury with fractional long-term burial, Atmos. Environ., 42, 2877–2884, http://dx.doi.org/10.1016/j.atmosenv.2007.05.029doi:10.1016/j.atmosenv.2007.05.029, 2008.

Brooks, S. B., Moore, C., Lew, D., Lefer, B., Huey, L. G., and Tanner, D.: Temperature and sunlight controls of mercury oxidation and deposition atop the Greenland ice sheet, Atmos. Chem. Phys. Discuss., 11, 3663–3691, http://dx.doi.org/10.5194/acpd-11-3663-2011doi:10.5194/acpd-11-3663-2011, 2011.

Chen, G., Davis, D., Crawford, J., Nowak, J. B., Eisele, F., Mauldin, R. L., Tanner, D., Buhr, M., Shetter, R., Lefer, B., Arimoto, R., Hogan, A., and Blake, D.: An investigation of South Pole HOx chemistry: Comparison of model results with ISCAT observations, Geophys. Res. Lett., 28, 3633–3636, 2001.

Chen, G., Davis, D., Crawford, J., Hutterli, L. M., Huey, L. G., Slusher, D., Mauldin, L., Eisele, F., Tanner, D., Dibb, J., Buhr, M., McConnell, J., Lefer, B., Shetter, R., Blake, D., Song, C. H., Lombardi, K., and Arnoldy, J.: A reassessment of HOx South Pole chemistry based on observations recorded during ISCAT 2000, Atmos. Environ., 38, 5451–5461, http://dx.doi.org/10.1016/j.atmosenv.2003.07.018doi:10.1016/j.atmosenv.2003.07.018, 2004.

Chen, G., Huey, L. G., Crawford, J. H., Olson, J. R., Hutterli, M. A., Sjostedt, S., Tanner, D., Dibb, J., Lefer, B., Blake, N., Davis, D., and Stohl, A.: An assessment of the polar HOx photochemical budget based on 2003 Summit Greenland field observations, Atmos. Environ., 41, 7806–7820, http://dx.doi.org/10.1016/j.atmosenv.2007.06.014doi:10.1016/j.atmosenv.2007.06.014, 2007.

Crawford, J. H., Davis, D. D., Chen, G., Buhr, M., Oltmans, S., Weller, R., Mauldin, L., Eisele, F., Shetter, R., Lefer, B., Arimoto, R., and Hogan, A.: Evidence for photochemical production of ozone at the South Pole surface, Geophys. Res. Lett., 28, 3641–3644, 2001.

Davis, D., Nowak, J. B., Chen, G., Buhr, M., Arimoto, R., Hogan, A., Eisele, F., Mauldin, L., Tanner, D., Shetter, R., Lefer, B., and McMurry, P.: Unexpected high levels of NO observed at South Pole, Geophys. Res. Lett., 28, 3625–3628, 2001.

Dibb, J. E. and Jaffrezo, J. L.: Air-snow exchange investigations at Summit, Greenland: An overview, J. Geophys. Res.-Oceans, 102, 26795–26807, 1997.

Dibb, J. E., Talbot, R. W., Munger, J. W., Jacob, D. J., and Fan, S. M.: Air-snow exchange of HNO3 and NOy at Summit, Greenland, J. Geophys. Res.-Atmos., 103, 3475–3486, 1998.

Dibb, J. E., Arsenault, M., Peterson, M. C., and Honrath, R. E.: Fast nitrogen oxide photochemistry in Summit, Greenland snow, Atmos. Environ., 36, 2501–2511, 2002.

Dibb, J. E., Huey, L. G., Slusher, D. L., and Tanner, D. J.: Soluble reactive nitrogen oxides at South Pole during ISCAT 2000, Atmos. Environ., 38, 5399–5409, http://dx.doi.org/10.1016/j.atmosenv.2003.01.001doi:10.1016/j.atmosenv.2003.01.001, 2004.

Donohoue, D. L., Bauer, D., Cossairt, B., and Hynes, A. J.: Temperature and pressure dependent rate coefficients for the reaction of Hg with Br and the reaction of Br with Br: A pulsed laser photolysis-pulsed laser induced fluorescence study, J. Phys. Chem. A, 110, 6623–6632, http://dx.doi.org/10.1021/jp054688jdoi:10.1021/jp054688j, 2006.

Faïn, X., Ferrari, C. P., Dommergue, A., Albert, M., Battle, M., Arnaud, L., Barnola, J.-M., Cairns, W., Barbante, C., and Boutron, C.: Mercury in the snow and firn at Summit Station, Central Greenland, and implications for the study of past atmospheric mercury levels, Atmos. Chem. Phys., 8, 3441–3457, http://dx.doi.org/10.5194/acp-8-3441-2008doi:10.5194/acp-8-3441-2008, 2008.

Grannas, A. M., Jones, A. E., Dibb, J., Ammann, M., Anastasio, C., Beine, H. J., Bergin, M., Bottenheim, J., Boxe, C. S., Carver, G., Chen, G., Crawford, J. H., Dominé, F., Frey, M. M., Guzmán, M. I., Heard, D. E., Helmig, D., Hoffmann, M. R., Honrath, R. E., Huey, L. G., Hutterli, M., Jacobi, H. W., Klàn, P., Lefer, B., McConnell, J., Plane, J., Sander, R., Savarino, J., Shepson, P. B., Simpson, W. R., Sodeau, J. R., von Glasow, R., Weller, R., Wolff, E. W., and Zhu, T.: An overview of snow photochemistry: evidence, mechanisms and impacts, Atmos. Chem. Phys., 7, 4329–4373, http://dx.doi.org/10.5194/acp-7-4329-2007doi:10.5194/acp-7-4329-2007, 2007.

Haman, C., Lefer, B., Dibb, J. E., and Clements, C.: Evidence for a mid- to upper-tropospheric source of bromide reaching Summit, Atmos. Chem. Phys. Discuss., in preparation, 2011.

Hammer, C. U., Clausen, H. B., and Dansgaard, W.: Greenland ice-sheet evidence of post-glacial volcanism and its climatic impact, Nature, 288, 230–235, 1980.

Hausmann, M. and Platt, U.: Spectroscopic measurement of bromine oxide and ozone in the high Arctic during polar sunrise experiment 1992, J. Geophys. Res.-Atmos., 99, 25399–25413, 1994.

Helmig, D., Boulter, J., David, D., Birks, J. W., Cullen, N. J., Steffen, K., Johnson, B. J., and Oltmans, S. J.: Ozone and meteorological Summit, Greenland, boundary-layer conditions at during 3–21~June 2000, Atmos. Environ., 36, 2595–2608, 2002.

Helmig, D., Johnson, B. J., Warshawsky, M., Morse, T., Neff, W. D., Eisele, F., and Davis, D. D.: Nitric oxide in the boundary-layer at South Pole during the Antarctic Tropospheric Chemistry Investigation (ANTCI), Atmos. Environ., 42, 2817–2830, http://dx.doi.org/10.1016/j.atmosenv.2007.03.061doi:10.1016/j.atmosenv.2007.03.061, 2008.

Honrath, R. E., Peterson, M. C., Guo, S., Dibb, J. E., Shepson, P. B., and Campbell, B.: Evidence of NOx production within or upon ice particles in the Greenland snowpack, Geophys. Res. Lett., 26, 695–698, 1999.

Honrath, R. E., Lu, Y., Peterson, M. C., Dibb, J. E., Arsenault, M. A., Cullen, N. J., and Steffen, K.: Vertical fluxes of NOx, HONO, and HNO3 above the snowpack at Summit, Greenland, Atmos. Environ., 36, 2629–2640, 2002.

Huey, L. G., Tanner, D. J., Slusher, D. L., Dibb, J. E., Arimoto, R., Chen, G., Davis, D., Buhr, M. P., Nowak, J. B., Mauldin, R. L., Eisele, F. L., and Kosciuch, E.: CIMS measurements of HNO3 and SO2 at the South Pole during ISCAT 2000, Atmos. Environ., 38, 5411–5421, http://dx.doi.org/10.1016/j.atmosenv.2004.04.037doi:10.1016/j.atmosenv.2004.04.037, 2004.

Huey, L. G., Hanson, D. R., and Howard, C. J.: Reactions of SF$_6^-$ and I$^-$ with atmospheric trace gases, J. Phys. Chem., 99, 5001–5008, 1995.

Hutterli, M. A., Rothlisberger, R., and Bales, R. C.: Atmosphere-to-snow-to-firn transfer studies of HCHO at Summit, Greenland, Geophys. Res. Lett., 26, 1691–1694, 1999.

Hutterli, M. A., McConnell, J. R., Stewart, R. W., Jacobi, H. W., and Bales, R. C.: Impact of temperature-driven cycling of hydrogen peroxide (H2O$_2)$ between air and snow on the planetary boundary layer, J. Geophys. Res.-Atmos., 106, 15395–15404, 2001.

Hutterli, M. A., McConnell, J. R., Chen, G., Bales, R. C., Davis, D. D., and Lenschow, D. H.: Formaldehyde and hydrogen peroxide in air, snow and interstitial air at South Pole, Atmos. Environ., 38, 5439–5450, http://dx.doi.org/10.1016/j.atmosenv.2004.06.003doi:10.1016/j.atmosenv.2004.06.003, 2004.

Jefferson, A., Tanner, D. J., Eisele, F. L., Davis, D. D., Chen, G., Crawford, J., Huey, J. W., Torres, A. L., and Berresheim, H.: OH photochemistry and methane sulfonic acid formation in the coastal Antarctic boundary layer, J. Geophys. Res.-Atmos., 103, 1647–1656, 1998.

Jones, A. E., Wolff, E. W., Salmon, R. A., Bauguitte, S. J.-B., Roscoe, H. K., Anderson, P. S., Ames, D., Clemitshaw, K. C., Fleming, Z. L., Bloss, W. J., Heard, D. E., Lee, J. D., Read, K. A., Hamer, P., Shallcross, D. E., Jackson, A. V., Walker, S. L., Lewis, A. C., Mills, G. P., Plane, J. M. C., Saiz-Lopez, A., Sturges, W. T., and Worton, D. R.: Chemistry of the Antarctic Boundary Layer and the Interface with Snow: an overview of the CHABLIS campaign, Atmos. Chem. Phys., 8, 3789–3803, http://dx.doi.org/10.5194/acp-8-3789-2008doi:10.5194/acp-8-3789-2008, 2008.

Kim, S., Huey, L. G., Stickel, R. E., Tanner, D. J., Crawford, J. H., Olson, J. R., Chen, G., Brune, W. H., Ren, X., Lesher, R., Wooldridge, P. J., Bertram, T. H., Perring, A., Cohen, R. C., Lefer, B. L., Shetter, R. E., Avery, M., Diskin, G., and Sokolik, I.: Measurement of HO2NO2 in the free troposphere during the intercontinental chemical transport experiment – North America 2004, J. Geophys. Res.-Atmos., 112, D12s01, http://dx.doi.org/10.1029/2006jd007676doi:10.1029/2006jd007676, 2007.

Liao, J., Sihler, H., Huey, L. G., Neuman, J. A., Tanner, D. J., Friess, U., Platt, U., Flocke, F. M., Orlando, P. B. Shepson, J. J., Beine, H. J., Weinheimer, A. J., Sjostedt, S. J., Nowak, J.B., Knapp, D. J., Staebler, R. M., Zheng, W., Sander, R., Hall, S. R., and Ullman, K.: A comparison of Arctic BrO measurements by chemical ionization mass spectrometry (CIMS) and long path-differential optical absorption spectroscopy (LP-DOAS), J. Geophys. Res., 116, D00R02, http://dx.doi.org/10.1029/2010JD014788doi:10.1029/2010JD014788, 2011a.

Liao, J., Huey, L.G., Tanner, D. J., Neuman, J.A., Flocke, F. M., Orlando, J. J., Nowak, J. B., Hall, S. R., Smith, J. N., Wang, Y., and Koo, J.: Observations of specific inorganic bromine species (HOBr, BrO, Br2 and BrCl) at Barrow, AK, J. Geophys. Res, submitted, 2011b.

Mahajan, A. S., Oetjen, H., Lee, J. D., Saiz-Lopez, A., McFiggans, G. B., and Plane, J. M. C.: High bromine oxide concentrations in the semi-polluted boundary layer, Atmos. Environ., 43, 3811–3818, http://dx.doi.org/10.1016/j.atmosenv.2009.05.033doi:10.1016/j.atmosenv.2009.05.033, 2009.

Mauldin, R. L., Eisele, F. L., Tanner, D. J., Kosciuch, E., Shetter, R., Lefer, B., Hall, S. R., Nowak, J. B., Buhr, M., Chen, G., Wang, P., and Davis, D.: Measurements of OH, H2SO4, and MSA at the South Pole during ISCAT, Geophys. Res. Lett., 28, 362-9-3632, 2001.

Mauldin, R. L., Kosciuch, E., Henry, B., Eisele, F. L., Shetter, R., Lefer, B., Chen, G., Davis, D., Huey, G., and Tanner, D.: Measurements of OH, HO2 + RO2, H2SO4, and MSA at the south pole during ISCAT 2000, Atmos. Environ., 38, 5423–5437, http://dx.doi.org/10.1016/j.atmosenv.2004.06.031doi:10.1016/j.atmosenv.2004.06.031, 2004.

Mauldin, R., Kosciuch, E., Eisele, F., Huey, G., Tanner, D., Sjostedt, S., Blake, D., Chen, G., Crawford, J., and Davis, D.: South Pole Antarctica observations and modeling results: New insights on HOx radical and sulfur chemistry, Atmos. Environ., 44, 572–581, http://dx.doi.org/10.1016/j.atmosenv.2009.07.058doi:10.1016/j.atmosenv.2009.07.058, 2010.

Mayewski, P. A. and Bender, M.: The GISP2 ice core record- paleoclimate highlights, Rev. Geophys., 33, 1287–1296, 1995.

Neuman, J. A., Nowak, J. B., Huey, L. G., Burkholder, J. B., Dibb, J. E., Holloway, J. S., Liao, J., Peischl, J., Roberts, J. M., Ryerson, T. B., Scheuer, E., Stark, H., Stickel, R. E., Tanner, D. J., and Weinheimer, A.: Bromine measurements in ozone depleted air over the Arctic Ocean, Atmos. Chem. Phys., 10, 6503–6514, http://dx.doi.org/10.5194/acp-10-6503-2010doi:10.5194/acp-10-6503-2010, 2010.

Read, K. A., Mahajan, A. S., Carpenter, L. J., Evans, M. J., Faria, B. V. E., Heard, D. E., Hopkins, J. R., Lee, J. D., Moller, S. J., Lewis, A. C., Mendes, L., McQuaid, J. B., Oetjen, H., Saiz-Lopez, A., Pilling, M. J., and Plane, J. M. C.: Extensive halogen-mediated ozone destruction over the tropical Atlantic Ocean, Nature, 453, 1232–1235, http://dx.doi.org/10.1038/nature07035doi:10.1038/nature07035, 2008.

Ren, X. R., Olson, J. R., Crawford, J. H., Brune, W. H., Mao, J. Q., Long, R. B., Chen, Z., Chen, G., Avery, M. A., Sachse, G. W., Barrick, J. D., Diskin, G. S., Huey, L. G., Fried, A., Cohen, R. C., Heikes, B., Wennberg, P. O., Singh, H. B., Blake, D. R., and Shetter, R. E.: HOx chemistry during INTEX-A 2004: Observation, model calculation, and comparison with previous studies, J. Geophys. Res.-Atmos., 113, D05310, http://dx.doi.org/10.1029/2007jd009166doi:10.1029/2007jd009166, 2008.

Ryerson, T. B., Williams, E. J., and Fehsenfeld, F. C.: An efficient photolysis system for fast-response NO2 measurements, J. Geophys. Res.-Atmos., 105, 26447–26461, 2000.

Saiz-Lopez, A., Shillito, J. A., Coe, H., and Plane, J. M. C.: Measurements and modelling of I2, IO, OIO, BrO and NO3 in the mid-latitude marine boundary layer, Atmos. Chem. Phys., 6, 1513–1528, http://dx.doi.org/10.5194/acp-6-1513-2006doi:10.5194/acp-6-1513-2006, 2006.

Saiz-Lopez, A., Mahajan, A. S., Salmon, R. A., Bauguitte, S. J. B., Jones, A. E., Roscoe, H. K., and Plane, J. M. C.: Boundary layer halogens in coastal Antarctica, Science, 317, 348–351, http://dx.doi.org/10.1126/science.1141408doi:10.1126/science.1141408, 2007.

Sander, S. P, Friedl, R. R., Golden, D. M., Kurylo, M. J., Moortgat, Keller-Rudek, H., G. K., Wine, P. H., Ravishankara, A. R., Kolb, C. E., Molina, M. J., Finlayson-Pitts, B., Huie, R. E., and Orkin, V. L: Chemical Kinetics and Photochemical Data for Use in Atmospheric Studies Evaluation Number 15, JPL Publ. 06-2, NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 2006.

Shetter, R. E. and Muller, M.: Photolysis frequency measurements using actinic flux spectroradiometry during the PEM-Tropics mission: Instrumentation description and some results, J. Geophys. Res.-Atmos., 104, 5647–5661, 1999.

Sjostedt, S. J.: Investigation of photochemistry at high latitudes: comparison of model predictions to measurements of short lived species, Ph.D thesis, Georgia Institute of Technology, Atlanta, 2006.

Sjostedt, S. J., Huey, L. G., Tanner, D. J., Peischl, J., Chen, G., Dibb, J. E., Lefer, B., Hutterli, M. A., Beyersdorf, A. J., Blake, N. J., Blake, D. R., Sueper, D., Ryerson, T., Burkhart, J., and Stohl, A.: Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003, Atmos. Environ., 41, 5122–5137, http://dx.doi.org/10.1016/j.atmosenv.2006.06.065doi:10.1016/j.atmosenv.2006.06.065, 2007.

Slusher, D. L., Pitteri, S. J., Haman, B. J., Tanner, D. J., and Huey, L. G.: A chemical ionization technique for measurement of pernitric acid in the upper troposphere and the polar boundary layer, Geophys. Res. Lett., 28, 3875–3878, 2001.

Slusher, D. L., Huey, L. G., Tanner, D. J., Chen, G., Davis, D. D., Buhr, M., Nowak, J. B., Eisele, F. L., Kosciuch, E., Mauldin, R. L., Lefer, B. L., Shetter, R. E., and Dibb, J. E.: Measurements of pernitric acid at the South Pole during ISCAT 2000, Geophys. Res. Lett., 29, http://dx.doi.org/10.1029/2002gl015703doi:10.1029/2002gl015703, 2011. 2002.

Streit, G. E.: Negative-ion chemistry and the electron-affinity of SF$_6$, J. Chem. Phys., 77, 826–833, 1982.

Stutz, J. and Platt, U.: Improving long-path differential optical absorption spectroscopy with a quartz-fiber mode mixer, Appl. Optics, 36, 1105–1115, 1997.

Stutz, J., Thomas, J. L., Hurlock, S. C., Schneider, M., von Glasow, R., Piot, M., Gorham, K., Burkhart, J. F., Ziemba, L., Dibb, J. E., and Lefer, B. L.: Longpath DOAS observations of surface BrO at Summit, Greenland, Atmos. Chem. Phys. Discuss., 11, 6707–6736, http://dx.doi.org/10.5194/acpd-11-6707-2011doi:10.5194/acpd-11-6707-2011, 2011.

Swanson, A. L., Blake, N. J., Dibb, J. E., Albert, M. R., Blake, D. R., and Rowland, F. S.: Photochemically induced production of CH3Br, CH3I, C2H$_5$I, ethene, and propene within surface snow at Summit, Greenland, Atmos. Environ., 36, 2671–2682, 2002.

Tanner, D. J., Jefferson, A., and Eisele, F. L.: Selected ion chemical ionization mass spectrometric measurement of OH, J. Geophys. Res.-Atmos., 102, 6415–6425, 1997.

Thomas, J. L., Stutz, J., Lefer, B., Huey, L. G., Toyota, K., Dibb, J. E., and von Glasow, R.: Modeling chemistry in and above snow at Summit, Greenland – Part 1: Model description and results, Atmos. Chem. Phys. Discuss., 10, 30927–30970, http://dx.doi.org/10.5194/acpd-10-30927-2010doi:10.5194/acpd-10-30927-2010, 2010.

Thomas, J. L., Stutz, J., Dibb, J. E., Huey, L. G., Lefer, B., and von Glasow, R.: Modeling halogen chemistry in and above snow at Summit, Greenland – Part 2: Radical Chemistry and Sensitivity Studies, Atmos. Chem. Phys. Discuss., in preparation, 2011.

Tuckermann, M., Ackermann, R., Golz, C., LorenzenSchmidt, H., Senne, T., Stutz, J., Trost, B., Unold, W., and Platt, U.: DOAS-observation of halogen radical-catalysed arctic boundary layer ozone destruction during the ARCTOC-campaigns 1995 and 1996 in Ny-Alesund, Spitsbergen, Tellus B, 49, 533–555, 1997.

Yang, J., Honrath, R. E., Peterson, M. C., Dibb, J. E., Sumner, A. L., Shepson, P. B., Frey, M., Jacobi, H. W., Swanson, A., and Blake, N.: Impacts of snowpack emissions on deduced levels of OH and peroxy radicals at Summit, Greenland, Atmos. Environ., 36, 2523–2534, 2002.

Ziemba, L. D., Dibb, J. E., Griffin, R. J., Huey, L. G., and Beckman, P.: Observations of particle growth at a remote, Arctic site, Atmos. Environ., 44, 1649–1657, http://dx.doi.org/10.1016/j.atmosenv.2010.01.032doi:10.1016/j.atmosenv.2010.01.032, 2010.