Measurement of loss rates of organic compounds in snow using in situ experiments and isotopically labelled compounds

Polar research

MartinM.Shafer¹  Erika von Schneidemesser¹  JamesJ.Schauer²  Michael H. Bergin³ 

[1] Environmental Chemistry and Technology Program, University of Wisconsin–Madison 660 North Park StreetMadison WI 53706, USA;Environmental Chemistry and Technology Program, University of Wisconsin–Madison 660 North Park StreetMadison WI 53706, USA Correspondence;School of Civil and Environmental Engineering and School of Earth and Atmospheric Sciences, 311 Ferst Drive Georgia Institute of TechnologyAtlanta GA 30332, USA

关键词: Snow;    photochemistry;    air pollution;    Greenland;    Arctic;   

DOI  :  10.3402/polar.v31i0.11597

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Organic molecular marker compounds are widely used to identify emissions from anthropogenic and biogenic air pollution sources in atmospheric samples and in deposition. Specific organic compounds have been detected in polar regions, but their fate after deposition to snow is poorly characterized. Within this context, a series of exposure experiments were carried out to observe the post-depositional processing of organic compounds under real-world conditions in snow on the surface of the Greenland Ice Sheet, at the Summit research station. Snow was prepared from water spiked with isotopically labelled organic compounds, representative of typical molecular marker compounds emitted from anthropogenic activities. Reaction rate constants and reaction order were determined based on a decrease in concentration to a stable, non-zero, threshold concentration. Fluoranthene-d 10, docosane-d 46, hexadecanoic acid-d 31, docosanoic acid-d 43 and azelaic acid-d 14 were estimated to have first order loss rates within sur...

【 授权许可】

CC BY-NC