Observations of hydroxyl and the sum of peroxy radicals at Summit,Greenland during summer 2003 |
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| Institution: | 1. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332-0340, USA;2. NASA Langley Research Center, Hampton, VA 23681, USA;3. Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH 03824-3525, USA;4. Geosciences Department, University of Houston, Houston, TX 77204-5007, USA;5. Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, USA;6. Physical Sciences Division, British Antarctic Survey, Cambridge, CB3 0ET, UK;7. Department of Chemistry, University of California at Irvine, Irvine, CA 92697-2025, USA;8. NOAA Aeronomy Lab, Boulder, CO 80305-3328, USA;9. School of Engineering, University of California, Merced, Merced, CA 95344-2039, USA;10. Norwegian Institute for Air Research, P.O. Box 100, 2027 Kjeller, Norway;1. The Centre for Atmospheric Science, The School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Simon Building, Brunswick Street, Manchester, M13 9PL, UK;2. School of Chemistry, The University of Bristol, Cantock''s Close BS8 1TS, UK;3. Facility for Airborne Atmospheric Measurements (FAAM), Building 125, Cranfield University, Cranfield, Bedford, MK43 0AL, UK;1. Department of Biomedical and Neuromotor Sciences, Cellular Signalling Laboratory, University of Bologna, Via Irnerio 48, 40126 Bologna, Italy;2. CNR – Consiglio Nazionale delle Ricerche, Istituto di Genetica Molecolare and SC Laboratorio di Biologia Cellulare Muscoloscheletrica, IOR, Bologna, Italy;3. Department of Microbiology and Immunology, Brody School of Medicine at East Carolina University, Greenville, NC, USA;1. School of Chemical Engineering & Technology, Hebei University of Technology, Tianjin 300130, China;2. Petrochemical College, Bayingol Vocational and Technical College, Xinjiang 841000, China;3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;4. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China;1. Chongqing Key Laboratory of Soil Multi-Scale Interfacial Process, College of Resources and Environment, Southwest University, Chongqing, 400715, China;2. Chongqing Engineering Research Center for Agricultural Non-Point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing, 400716, China;3. Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, China;1. Department of Electronics and Communication Engineering, Indian Institute of Information Technology, Design and Manufacturing, Kancheepuram, Chennai 600127, India;2. Department of Electronics and Communication Engineering, Motilal Nehru National Institute of Technology Allahabad, Allahabad 211004, India |
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| Abstract: | The first measurements of peroxy (HO2+RO2) and hydroxyl (OH) radicals above the arctic snowpack were collected during the summer 2003 campaign at Summit, Greenland. The median measured number densities for peroxy and hydroxyl radicals were 2.2×108 mol cm?3 and 6.4×106 mol cm?3, respectively. The observed peroxy radical values are in excellent agreement (, ) with highly constrained model predictions. However, calculated hydroxyl number densities are consistently more than a factor of 2 lower than the observed values. These results indicate that our current understanding of radical sources and sinks is in accord with our observations in this environment but that there may be a mechanism that is perturbing the (HO2+RO2)/OH ratio. This observed ratio was also found to depend on meteorological conditions especially during periods of high winds accompanied by blowing snow. Backward transport model simulations indicate that these periods of high winds were characterized by rapid transport (1–2 days) of marine boundary layer air to Summit. These data suggest that the boundary layer photochemistry at Summit may be periodically impacted by halogens. |
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