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Environmental problems - Chemical approaches
RESEARCH ARTICLE

Snow – a photobiochemical exchange platform for volatile and semi-volatile organic compounds with the atmosphere

P. A. Ariya A B H , F. Domine C , G. Kos B , M. Amyot D , V. Côté B , H. Vali E , T. Lauzier C , W. F. Kuhs F , K. Techmer F , T. Heinrichs G and R. Mortazavi A
+ Author Affiliations
- Author Affiliations

A McGill University, Department of Chemistry, 801 Sherbrooke Street West, Montreal, QC, H3A 2K6, Canada.

B McGill University, Department of Atmospheric & Oceanic Sciences, 805 Sherbrooke Street West, Montreal, QC, H3A 2K6, Canada.

C Centre national de la recherche scientifique (CNRS), Laboratoire de Glaciologie et Géophysique de l’Environnement, B.P. 96, 54 Rue Molière, F-38402 Saint-Martin d’Hères, Cedex, France.

D Département des sciences biologiques, Université de Montréal, 90, Vincent D’Indy, D-223, Montréal, QC, H2V 2S9, Canada.

E Departments of Anatomy & Earth and Planetary Sciences, McGill University, 3640 University Street, Montréal, QC, H3A 2B2, Canada.

F Geowissenschaftliches Zentrum der Universität Göttingen (GZG), Abteilung Kristallographie, Universität Göttingen, Goldschmidtstrasse 1, D-37077 Göttingen, Germany.

G GZG, Abteilung Allgemeine und Angewandte Geologie, Universität Goettingen, Goldschmidtstrasse 3, D-37077 Göttingen, Germany.

H Corresponding author. Email: parisa.ariya@mcgill.ca

Environmental Chemistry 8(1) 62-73 https://doi.org/10.1071/EN10056
Submitted: 26 May 2010  Accepted: 12 October 2010   Published: 28 February 2011

Environmental context. Recent research has been directed towards the exchange of microorganisms and chemical compounds between snow and air. We investigate how microorganisms and chemical species in snow from the Arctic and temperate regions are transferred to the atmosphere and altered by the sun's energy. Results suggest that snow photo-biochemical reactions, in addition to physical‐chemical reactions, should be considered in describing organic matter in air–snow exchanges, and in investigations of climate change.

Abstract. Field and laboratory studies of organic compounds in snow (12 species; concentrations ≤17 µg L–1) were conducted and microorganisms in snow and aerosols at urban and Arctic sites were investigated (snow: total bacteria count ≤40000 colony forming units per millilitre (CFU mL–1), fungi ≤400 CFU mL–1; air: bacteria ≤2.2 × 107 CFU m–3, fungi ≤84 CFU m–3). Bio-organic material is transferred between snow and air and influence on snow-air exchange processes is demonstrated. Volatile organic compounds in snow are released into the air upon melting. In vitro photochemistry indicated an increase of ≤60 µg L–1 for 1,3- and 1,4-dimethylbenzenes. Bacillus cereus was identified and observed in snow and air with ice-nucleating being P. syringae absent. As a result snow photobiochemical reactions should be considered in describing organic matter air–snow exchanges, and the investigation of climate change.


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