caa a22 4500 475823206 CHVBK 20180406123824.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1023/A:1006301029874 doi (NATIONALLICENCE)springer-10.1023/A:1006301029874 Is the Arctic Surface Layer a Source and Sink of NOx in Winter/Spring? [Elektronische Daten] [B. Ridley, J. Walega, D. Montzka, F. Grahek, E. Atlas, F. Flocke, V. Stroud, J. Deary, A. Gallant, H. Boudries, J. Bottenheim, K. Anlauf, D. Worthy, A. Sumner, B. Splawn, P. Shepson] Measurements of NOx (NO +NO2) and the sum of reactive nitrogenconstituents, NOy, were made near the surface atAlert (82.5°N), Canada during March and April1998. In early March when solar insolation was absentor very low, NOx mixing ratios were frequentlynear zero. After polar sunrise when the sun was abovethe horizon for much or all of the day a diurnalvariation in NOx and NOy was observed withamplitudes as large as 30-40 pptv. The source ofactive nitrogen is attributed to release from the snowsurface by a process that is apparently sensitized bysunlight. If the source from the snowpack is a largescale feature of the Arctic then the diurnal trendsalso require a competing process for removal to thesurface. From the diurnal change in the NO/NO2ratio, mid-April mixing ratios for the sum of peroxyand halogen oxide radicals of ≤10 pptv werederived for periods when ozone mixing ratios were inthe normal range of 30-50 ppbv. Mid-day ozoneproduction and loss rates with the active nitrogensource were estimated to be ∼1-2 ppbv/day and in nearbalance. NOy mixing ratios which averaged only295±66 pptv do not support a large accumulation inthe high Arctic surface layer in the winter and springof 1998. The small abundance of NOy relative tothe elevated mixing ratios of other long-livedanthropogenic constituents requires that reactivenitrogen be removed to the surface during transport toor during residence within the high Arctic. Kluwer Academic Publishers, 2000 active nitrogen nationallicence ozone nationallicence radicals nationallicence snow chemistry nationallicence Arctic nationallicence surface layer nationallicence Ridley B. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A. aut Walega J. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A. aut Montzka D. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A. aut Grahek F. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A. aut Atlas E. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A. aut Flocke F. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A. aut Stroud V. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A. aut Deary J. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut Gallant A. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut Boudries H. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut Bottenheim J. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut Anlauf K. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut Worthy D. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut Sumner A. Departments of Chemistry and Earth and Atmospheric Sciences, Purdue University, 47907, West Lafayette, IN, U.S.A. aut Splawn B. Departments of Chemistry and Earth and Atmospheric Sciences, Purdue University, 47907, West Lafayette, IN, U.S.A. aut Shepson P. Departments of Chemistry and Earth and Atmospheric Sciences, Purdue University, 47907, West Lafayette, IN, U.S.A. aut Journal of Atmospheric Chemistry Kluwer Academic Publishers 36/1(2000-05-01), 1-22 0167-7764 36:1<1 2000 36 10874 https://doi.org/10.1023/A:1006301029874 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1006301029874 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ridley B. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A aut NATIONALLICENCE 700 1- Walega J. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A aut NATIONALLICENCE 700 1- Montzka D. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A aut NATIONALLICENCE 700 1- Grahek F. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A aut NATIONALLICENCE 700 1- Atlas E. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A aut NATIONALLICENCE 700 1- Flocke F. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A aut NATIONALLICENCE 700 1- Stroud V. Atmospheric Chemistry Division, National Center for Atmospheric Research, PO Box 3000, 80307, Boulder, CO, U.S.A aut NATIONALLICENCE 700 1- Deary J. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut NATIONALLICENCE 700 1- Gallant A. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut NATIONALLICENCE 700 1- Boudries H. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut NATIONALLICENCE 700 1- Bottenheim J. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut NATIONALLICENCE 700 1- Anlauf K. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut NATIONALLICENCE 700 1- Worthy D. Atmospheric Environment Service, 4905 Dufferin St., M3H 5T4, Downsview, Ontario, Canada aut NATIONALLICENCE 700 1- Sumner A. Departments of Chemistry and Earth and Atmospheric Sciences, Purdue University, 47907, West Lafayette, IN, U.S.A aut NATIONALLICENCE 700 1- Splawn B. Departments of Chemistry and Earth and Atmospheric Sciences, Purdue University, 47907, West Lafayette, IN, U.S.A aut NATIONALLICENCE 700 1- Shepson P. Departments of Chemistry and Earth and Atmospheric Sciences, Purdue University, 47907, West Lafayette, IN, U.S.A aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers 36/1(2000-05-01), 1-22 0167-7764 36:1<1 2000 36 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer