Organic and Elemental Composition of Submicron Aerosol Particles during AWARE at McMurdo Station, Antarctica
About this CollectionThe FTIR filter sampling systems was deployed as part of the ARM West Antarctic Radiation Experiment (AWARE) campaign to measure organic aerosol characterisctics at McMurdo Station. Thirteen months of continuous observations of aerosol particle composition extended from November 2015 to December 2016. Filter samples were collected at McMurdo on pre-scanned Teflon filters (Teflon, Pall Inc., 37mm diameter) behind PM1 sharp-cut cyclones (SCC2.229 PM1, BGI Inc). Samples were collected each week with approximately 50 - 90 m3 air filtered per sample. Samples were frozen and transported below 0℃ to the Scripps laboratory for FTIR spectroscopy analysis. A Bruker Tensor 27 FTIR spectrometer with a deuterated triglycine sulfate (DTGS) detector (Bruker, Waltham, MA) was used to scan the filters both before and after sampling. An automated algorithm was applied to quantify the mass of the organic functional groups. Five groups (alkane, amine, alcohol, carbonyl and carboxylic acid) had absorption peaks above the limits of quantification, and the sum of the mass of the five functional groups is the quantified OM. Absorption peaks for other groups (organosulfate, organonitrate, aromatic and alkene group) were identified and fit but they were below the limit of quantification for more than 90% of the samples and are excluded. 25 selected filters were analyzed by Chester Lab for elemental mass above m/z23 by XRF.
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