The multi-seasonal NO y budget in coastal Antarctica and its link with surface snow and ice core nitrate: results from the CHABLIS campaign

• Main Authors: Jones, A. E., Wolff, E. W., Ames, D., Bauguitte, S. J.-B., Clemitshaw, K. C., Fleming, Z., Mills, G. P., Saiz-Lopez, A., Salmon, R. A., Sturges, W. T., Worton, D. R.
• Other Authors: British Antarctic Survey (BAS), Natural Environment Research Council (NERC), Dept. of Environmental Science and Technology, Imperial College of Science, School of Environmental Sciences Norwich, University of East Anglia Norwich (UEA)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2007
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; Antarctic; Austral; Halley Station; The Antarctic; Antarc*; Antarctica; ice core
• Online Access: https://hal.science/hal-00302680; https://hal.science/hal-00302680/document; https://hal.science/hal-00302680/file/acpd-7-4127-2007.pdf

International audience Measurements of individual NO y components were carried out at Halley station in coastal Antarctica. The measurements were made as part of the CHABLIS campaign (Chemistry of the Antarctic Boundary Layer and the Interface with Snow) and cover over half a year, from austral winter 2004 through to austral summer 2005. They are the longest duration and most extensive NO y budget study carried out to date in polar regions. Results show clear dominance of organic NO y compounds (PAN and MeONO 2 ) during the winter months, with low concentrations of inorganic NO y , but a reversal of this situation towards summer when the balance shifts in favour of inorganic NO y . Multi-seasonal measurements of surface snow nitrate correlate strongly with inorganic NO y species. One case study in August suggested that particulate nitrate was the dominant source of nitrate to the snowpack, but this was not the consistent picture throughout the measurement period. An analysis of NO x production rates showed that emissions of NO x from the snowpack dominate over gas-phase sources of "new NO x ", suggesting that, for certain periods in the past, the flux of NO x into the boundary layer can be calculated from ice core nitrate data.