Measurement and interpretation of gas phase formaldehyde concentrations obtained during the CHABLIS campaign in coastal Antarctica R. A. Salmon1, S. J.-B. Bauguitte1, W. Bloss2, M. A. Hutterli1, A. E. Jones1, K. Read3, and E. W. Wolff1 1British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK 2School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK 3Department of Chemistry, University of York, Heslington, York YO19 4RR, UK
Abstract. Gas phase formaldehyde concentrations were measured during the 2004–2005
CHABLIS campaign at Halley research station, Antarctica. Data coverage span
from May 2004 through to January 2005, thus capturing the majority of the
year, with a wintertime minimum of near or below the instrumental detection
limit rising to between 50 and 200 pptv during the austral summer. Factors
controlling HCHO concentration include local chemical sources and sinks, and
exchange with the snow surface. The measured seasonality is in line with
previous observations from Neumayer station, with maximum in summer and
minimum during the winter months, but with lower absolute concentrations
throughout the year. The gas-phase production of HCHO was dominated by
methane oxidation and a steady-state analysis showed that reactions of
iodine and bromine species substantially reduced the predicted HCHO levels
based upon in situ chemistry. This indicates a substantial additional HCHO
source to be present that could be explained by a snowpack source.
Citation: Salmon, R. A., Bauguitte, S. J.-B., Bloss, W., Hutterli, M. A., Jones, A. E., Read, K., and Wolff, E. W.: Measurement and interpretation of gas phase formaldehyde concentrations obtained during the CHABLIS campaign in coastal Antarctica, Atmos. Chem. Phys., 8, 4085-4093, doi:10.5194/acp-8-4085-2008, 2008.