Concentrations of higher dicarboxylic acids C5–C13 in fresh snow samples collected at the High Alpine Research Station Jungfraujoch during CLACE 5 and 6 R. Winterhalter1, M. Kippenberger1, J. Williams1, E. Fries2,*, K. Sieg2, and G. K. Moortgat1 1Max Planck Institute for Chemistry, Atmospheric Chemistry Division, J.-J. Becherweg 27, 55128 Mainz, Germany 2Institute for Atmosphere and Environment, J.W. Goethe-University Frankfurt am Main, Germany *now at: Institute for Environmental Systems Research, University of Osnabrück, Barbarastr. 12, 49069 Osnabrück, Germany
Abstract. Samples of freshly fallen snow were collected at the high alpine research
station Jungfraujoch (Switzerland) in February and March 2006 and 2007,
during the Cloud and Aerosol Characterization
Experiments (CLACE) 5 and 6. In this study a new technique has been
developed and demonstrated for the measurement of organic acids in fresh
snow. The melted snow samples were subjected to solid phase extraction and
resulting solutions analysed for organic acids by HPLC-MS-TOF using negative
electrospray ionization. A series of linear dicarboxylic acids from C5
to C13 and phthalic acid, were identified and quantified. In several
samples the biogenic acid pinonic acid was also observed. In fresh snow the
median concentration of the most abundant acid, adipic acid, was 0.69 μg L−1
in 2006 and 0.70 μg L−1 in 2007. Glutaric acid was the
second most abundant dicarboxylic acid found with median values of 0.46 μg L−1
in 2006 and 0.61 μg L−1 in 2007, while the aromatic
acid phthalic acid showed a median concentration of 0.34 μg L−1 in
2006 and 0.45 μg L−1 in 2007. The concentrations in the samples
from various snowfall events varied significantly, and were found to be
dependent on the back trajectory of the air mass arriving at Jungfraujoch.
Air masses of marine origin showed the lowest concentrations of acids
whereas the highest concentrations were measured when the air mass was
strongly influenced by boundary layer air.
Citation: Winterhalter, R., Kippenberger, M., Williams, J., Fries, E., Sieg, K., and Moortgat, G. K.: Concentrations of higher dicarboxylic acids C5–C13 in fresh snow samples collected at the High Alpine Research Station Jungfraujoch during CLACE 5 and 6, Atmos. Chem. Phys., 9, 2097-2112, doi:10.5194/acp-9-2097-2009, 2009.