High summertime aerosol organic functional group concentrations from marine and seabird sources at Ross Island, Antarctica, during AWARE

摘要: Abstract. Observations of the organic components natural aerosol are scarce in Antarctica, which limits our understanding aerosols and their connection to seasonal spatial patterns cloud albedo in region. From November 2015 December 2016, ARM West Antarctic Radiation Experiment (AWARE) measured submicron properties near McMurdo Station at southern tip Ross Island. Submicron mass (OM), particle number, condensation nuclei concentrations were higher summer than other seasons. The measurements included a range compositions and concentrations that likely reflected both local anthropogenic emissions and natural background sources. We isolated by separating factor combustion factor. OM was 150 times summer than winter. emissions were not hygroscopic had little contribution CCN concentrations. Natural sources marine sea spray seabird emissions contributed 56 % but only 3 % OM had high hydroxyl group fraction (55 %), 6 % alkane, 6 % amine mass, consistent with composition. In addition, the Fourier transform infrared (FTIR) spectra showed of organic characterized by amide absorption, may be from populations. Carboxylic acid contributions in summer associated sources, forming secondary reactions.