Elemental composition of aerosol in the Nam Co region, Tibetan Plateau, during summer monsoon season

Sea spray aerosol in central Antarctica. Present atmospheric behaviour and implications for paleoclimatic reconstructions

https://epic.awi.de/24679/1/Tomasi-etal-AE.pdf

An update on polar aerosol optical properties using POLAR-AOD and other measurements performed during the International Polar Year

An integrated approach to assess air pollution threats to cultural heritage in a semi-confined environment: the case study of Michelozzo's Courtyard in Florence (Italy).

. To investigate the impact of marine aerosols on global climate change it is important to study their chemical composition and size distribution. Amino acids are a component of the organic nitrogen in aerosols and particles containing amino acids have been found to be efficient ice nuclei. The main aim of this study was to investigate the L- and D-free amino acid composition as possible tracers of primary biological production in Antarctic aerosols from three different areas: two continental bases, Mario Zucchelli Station (MZS) on the coast of the Ross Sea, Concordia Station at Dome C on the Antarctic Plateau, and the Southern Ocean near the Antarctic continent. Studying the size distribution of amino acids in aerosols allowed us to characterize this component of the water-soluble organic carbon (WSOC) in marine aerosols near their source and after long-range transport. The presence of only free L-amino acids in our samples is indicative of the prevalence of phytoplanktonic material. Sampling at these three points allowed us to study the reactivity of these compounds during long-range transport. The mean total amino acid concentration detected at MZS was 11 pmol m−3, a higher percentage of amino acids were found in the fine fraction. The aerosol samples collected at Dome C had the lowest amino acid values (0.7 and 0.8 pmol m−3), and the coarse particles were found to have higher concentrations of amino acids compared to the coastal site. The amino acid composition in the aerosol collected at Dome C had also changed compared to the coastal site, suggesting that physical and chemical transformations had occurred during long range transport. During the sampling cruise on the R/V Italica on the Southern Ocean, high concentrations of amino acids were found in the total suspended particles, this we attribute to the presence of intact biological material (as microorganisms or plant material) in the sample.

/pdf/free-amino-acids-in-antarctic-aerosol-potential-markers-for-u37hhm4quk.pdf

Free amino acids in Antarctic aerosol: potential markers for the evolution and fate of marine aerosol

During the 2002–2003 austral summer field season, aerosol samples were collected at a coastal (Terra Nova Bay—Northern Victoria Land) and an inland site (Dome C—East Antarctic Plateau). The sampling was carried out by stacked filter units made up of two filters at different porosity (5.0 and 0.4 μm at Terra Nova Bay and 3.0 and 0.4 μm at Dome C), able to roughly separate a coarse from a fine fraction. At Dome C, a further investigation on aerosol size distribution was performed by an inertial impactor able to collect aerosol particles on 8 size classes (from 10 to 0.4 μm). Atomic Force Microscopy was applied to the filter collecting the finer fraction in both sites in order to assess the real cut-off value of the filter sandwich apparatus and to reconstruct the volume size distribution. At the employed flow conditions, the real cut-off value was revealed to be about one third with respect to the filter nominal porosity in both stations. The size distribution plots showed a bimodal distribution with a mode centered around 0.22 μm in both the sites and a second broader mode which is centered between 0.3 μm and 1.2 μm diameter at Terra Nova Bay and shifted toward higher values (centred around 1.0 μm diameter) at Dome C. Each filter was analysed for the main and trace ionic components allowing evaluation of the contributions of primary and secondary aerosol sources at the two sites as a function of the particle size class. The coastal site is mainly affected by primary and secondary marine inputs: the sea spray contribution (Na+, Mg2+, Cl− and ssSO42−) is dominant (77% w/w) in the coarse fraction whereas the biogenic source (methanesulfonate and nssSO42−) prevails (67.5% w/w) in the fine fraction. In this fraction a significant contribution (15.5% w/w) is provided by ammonium likely to be related to surrounding penguin colonies. Dome C atmosphere is characterised by fine particles arising from secondary sources and long-range transport processes. The main component in the fine and coarse fractions at Dome C is sulfate whose nssSO42− represents the 99.5% and the 92.3%
				(w/w) in fine and coarse fraction, respectively. The observed agreement between nssSO42− and methanesulfonate temporal profiles in the fine fraction demonstrates that biogenic emissions dominate the inland background aerosol. Results from the sampling by the 8-stage impactor at Dome C are presented here: chloride and nitrate are mainly deposited on the 10–2.1 μm stages while the highest sulfate concentration was found in the submicrometric fraction which turned out to be the most acidic. Such a distribution is able to prevent nitrate and chloride re-emission as gaseous HCl and HNO3 in the 10–2.1 μm stages, arising from the exchange reaction between chloride and nitrate salts and sulfuric acid. Moreover, the concentration peak observed for nitrate in coarser fractions is probably related also to the formation of hygroscopic NH4NO3 particles and nitrate adsorption on sea salt particles.

Chemical composition and physical features of summer aerosol at Terra Nova Bay and Dome C, Antarctica

Surface-Distribution pattern of atmospheric aerosol particles collected in coastal and inner Antarctic sites by Atomic Force Microscopy measurements”

E. Bolzacchini, L. Ferrero, C. Lo Porto, M. G. Perrone, G. de Gennaro, P. Bruno, M. Caselli, P. R. Dambruoso, B. E. Daresta, C. M. Placentino, M. Tutino, M. Amodio, D. Baldacci, M. Stracquadanio, L. Tositti, S. Zappoli, D. Gullotto, V. Librando, Z. Minniti, G. Perrini, G. Trincali, S. Becagli, A. Mannini, R. Udisti, C. Paradisi, A. Tapparo, P. Barbieri, L. Capriglia, F.Cozzi, E. Maran, E. Reisenhofer, V. Sicardi. P.Fermo, A. Piazzalunga Department of Environmental Science and Technology, University of Bicocca, p.za della Scienza 1, 20126, Milan, Italy Department of Chemistry, University of Bari , p.za Umberto I, 70121 Bari

/pdf/concentration-and-the-chemical-characterization-of-pm10-and-23158zqm9g.pdf

Concentration and the chemical characterization of PM10 and PM2.5 in all the Italian territory

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Chemical composition and physical features of summer aerosol at Terra Nova Bay and Dome C, Antarctica

Surface-Distribution pattern of atmospheric aerosol particles collected in coastal and inner Antarctic sites by Atomic Force Microscopy measurements”

Concentration and the chemical characterization of PM10 and PM2.5 in all the Italian territory