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Marine Aerosol impact on Clouds in the Arctic (MACA)
Call year: 2017
Status: active
IADC_id: 90
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This is the italian contribution to the MACA project (RIS 10713). The main purpose is the investigation of the Ice Nuclei (IN) concentrations. IN will be measured by the membrane filter technique (Bigg et al., 1963). Aerosol will be sampled on filters for off-line IN determination by a dynamic filter processing chamber (DFPC). DFPC is an off-line technique, used under several field campaigns (Belosi et al., 2012) and intercomparison studies (FIN2). A description is providen in Santachiara et al., 2010. The project objectives will be reached by setting up an experimental sampling line near the main mesocosme experiment of the MACA project. Few samplings will be performed also with ambient air from the external environment. In this last case, the sampling line will be equipped with an inlet head (PM10) and an aspirating pump manually operated. Millipore cellulose nitrate black gridded filters (porosity 0.45 µm) will be used. Sampled filters will be stored at ambient temperature. During the filter samplings, continuous measurements of particle size distributions (range 0.3-20 micron) at high temporal resolution (1 minute) will be carried out by means of an Optical Particle Counter (OPC). The filters will be analysed at ISAC-CNR laboratory (Bologna, Italy) to detect the IN concentrations by the DFPC chamber. The IN particles collected onto the filters will be study at temperatures relevant for biogenic particle activation. The saturation ratios considered will allow to detect IN in deposition and condensation modes. Results from laboratory filter analysis will focus on: IN concentration, activation fraction and Ice Nuclei Activation Site density (INAS). The results will be combined with the other characterisations performed in the closed areas.
National/International Cooperation:
1)University Blaise Pascal (LaMP CNRS/UBP) Laboratory of Meteorology and Physics, France rn2)Institute of Researches on Catalysis and Environment in Lyon (IRCELyon)CNRS, France rn3)Mediterranian Centre for Marine Ecosystems Experimental Research (MEDIMEER)CNRS, France rn4)University of Helsinki (UoH), Department of Physics, Finland
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