246c23cb-d1df-4135-b59e-53ee09f608ec eng 4795ce12-71f2-48fe-a072-4c94dd912aa9 Ev-K2-CNR +39 035 3230511 +39 035 3230551 Via San Bernardino 145 Bergamo BG 24126 Italy metadata@evk2cnr.org http://www.evk2cnr.org/ 2012-03-06T12:04:18 ISO 19115:2003/19139 1.0 Physical aerosol properties and their relation to air mass origin at Monte Cimone (Italy) during the first MINATROC campaign ACP - Special Issue 2005-08-19T00:00:00 Mineral dust and tropospheric chemistry (MINATROC 2000) 8 2203-2226 Atmos. Chem. Phys., 5, 2203-2226, 2005 Atmos. Chem. Phys., 5, 2203-2226, 2005 1680-7316 Aerosol physical properties were measured at the Monte Cimone Observatory (Italy) from 1 June till 6 July 2000. The measurement site is located in the transition zone between the continental boundary layer and the free troposphere (FT), at the border between the Mediterranean area and Central Europe, and is exposed to a variety of air masses. Sub-µm number size distributions, aerosol hygroscopicity near 90% RH, refractory size distribution at 270°C and equivalent black carbon mass were continuously measured. Number size distributions and hygroscopic properties indicate that the site is exposed to aged continental air masses, however during daytime it is also affected by upslope winds. The mixing of this transported polluted boundary layer air masses with relatively clean FT air leads to frequent nucleation events around local noon. Night-time size distributions, including fine and coarse fractions for each air mass episode, have been parameterized by a 3-modal lognormal distribution. Number and volume concentrations in the sub-?m modes are strongly affected by the air mass origin, with highest levels in NW-European air masses, versus very clean, free tropospheric air coming from the N-European sector. During a brief but distinct dust episode, the coarse mode is clearly enhanced. The observed hygroscopic behavior of the aerosol is consistent with the chemical composition described by Putaud et al. (2004), but no closure between known chemical composition and measured hygroscopicity could be made because the hygroscopic properties of the water-soluble organic matter (WSOM) are not known. The data suggest that WSOM is slightly-to-moderately hygroscopic (hygroscopic growth factor GF at 90% relative humidity between 1.05 and 1.51), and that this property may well depend on the air mass origin and history. External mixing of aerosol particles is observed in all air masses through the occurrence of two hygroscopicity modes (average GF of 1.22 and 1.37, respectively). However, the presence of "less" hygroscopic particles has mostly such a low occurrence rate that the average growth factor distribution for each air mass sector actually appears as a single mode. This is not the case for the dust episode, where the external mixing between less hygroscopic and more hygroscopic particles is very prominent, and indicating clearly the occurrence of a dust accumulation mode, extending down to 50 nm particles, along with an anthropogenic pollution mode. The presented physical measurements finally allow us to provide a partitioning of the sub-?m aerosol in four non-overlapping fractions (soluble/volatile, non-soluble/volatile, refractory/non-black carbon, black carbon) which can be associated with separate groups of chemical compounds determined with chemical-analytical techniques (ions, non-water soluble organic matter, dust, elemental carbon). All air masses except the free-tropospheric N-European and Dust episodes show a similar composition within the uncertainty of the data (53%, 37%, 5% and 5% respectively for the four defined fractions). Compared to these sectors, the dust episode shows a clearly enhanced refractory-non-BC fraction (17%), attributed to dust in the accumulation mode, whereas for the very clean N-EUR sector, the total refractory fraction is 25%, of which 13% non-BC and 12% BC. Rita Van Dingenen European Commission, Joint Research Centre, Institute for Environment and Sustainability +39 0332789300 +39 0332785837 Via E. Fermi 2749 Ispra VA 21027 Italy dingenen@jrc.it http://ies.jrc.ec.europa.eu/contact.html Yves Balkanski National Centre for Scientific Research,Laboratory CEA-CNRS-UVSQ, LSCE/IPSL +33 0169087725 +33 0169083073 L'Orme des Merisiers, Bat. 712, Point courrier 132 Gif-sur-Yvette Cedex 91191 France yves.balkanski@cea.fr yves.balkanski@lsce.ipsl.fr balkansk@lsce.saclay.cea.fr http://www.cnrs.fr/ Copernicus GmbH (Copernicus Publications) +49 5519003390 +49 55190033970 Bahnhofsallee 1e Göttingen 37081 Germany info@copernicus.org http://www.copernicus.org/ Jean P. Putaud European Commission, Joint Research Centre, Institute for Environment and Sustainability, +39 0332785041 +39 0332785837 Via E. Fermi 2749 Ispra 21027 Italy jean.putaud@jrc.it jean.putaud@jrc.ec.europa.eu http://ies.jrc.ec.europa.eu/contact.html Frank Raes European Commission, Joint Research Centre, Institute for Environment and Sustainability +39 0332789111 Via E. Fermi 2749 Ispra VA 21027 Italy frank.raes@jrc.it http://ec.europa.eu/dgs/jrc/index.cfm S. Martins-Dos Santos European Commission, Joint Research Centre, Institute for Environment and Sustainability Via E. Fermi 2749 Ispra 21027 Italy http://ec.europa.eu/dgs/jrc/index.cfm https://geoportal.mountaingenius.org/geonetwork/srv/eng/resources.get?uuid=246c23cb-d1df-4135-b59e-53ee09f608ec&fname=mountain_witness__s.png thumbnail png SHARE aerosol free troposphere Physical aerosol properties air mass Mt. Cimone MINATROC eng climatologyMeteorologyAtmosphere environment 6.62397 18.5144 36.6492 47.0946 http://www.atmos-chem-phys.net/special_issue6.html WWW:LINK-1.0-http--related ACP - Special Issue Mineral dust and tropospheric chemistry (MINATROC 2000) http://www.atmos-chem-phys.net/5/2203/2005/acp-5-2203-2005.html WWW:LINK-1.0-http--related Abstract:"Physical aerosol properties and their relation to air mass origin at Monte Cimone (Italy) during the first MINATROC campaign." https://geoportal.mountaingenius.org/webapp/srv/en/resources.get?id=37773&fname=acp-5-2203-2005_1.pdf&access=private WWW:DOWNLOAD-1.0-http--download acp-5-2203-2005_1.pdf Full Text(pdf)"Physical aerosol properties and their relation to air mass origin at Monte Cimone (Italy) during the first MINATROC campaign" ACP - Special Issue "Mineral dust and tropospheric chemistry (MINATROC 2000)": -"Physical aerosol properties and their relation to air mass origin at Monte Cimone (Italy) during the first MINATROC campaign": R. Van Dingenen, J.-P. Putaud, S. Martins-Dos Santos, and F. Raes Atmos. Chem. Phys., 5, 2203-2226, 2005.