930108e1-3560-48af-bf40-d8686551f22f eng Ev-K2-CNR +39 035 3230511 +39 035 3230551 Via San Bernardino 145 Bergamo BG 24126 Italy metadata@evk2cnr.org http://www.evk2cnr.org/ 2012-03-07T18:23:59 ISO 19115:2003/19139 1.0 Characterization of atmospheric aerosols at Monte Cimone, Italy, during summer 2004: source apportionment and transport mechanisms 2006-12-16T00:00:00 JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111 D24202 15 PP JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, D24202, 15 PP., 2006 doi:10.1029/2006JD007145 J. Geophys. Res., 111(D24202), 15 PP,2006. 0148-0227 In this paper we present a study on stratospheric intrusion (SI) events recorded at a high mountain station in the Italian northern Apennines. Six years (1998–2003) of surface ozone and beryllium-7 concentration measurements as well as relative humidity values recorded at the GAW Mt. Cimone research station (44°11'N, 10°42'E; 2165 m asl) were analyzed. Moreover, three-dimensional backward trajectories calculated by the FLEXTRA model and potential vorticity values along these trajectories were used. In order to identify SI and evaluate their contribution to the tropospheric ozone at Mt. Cimone, a statistical methodology was developed. This methodology consists of different selection criteria based on observed and modeled stratospheric tracers as well as on tropopause height values recorded by radio soundings. On average, SI effects affected Mt. Cimone for about 36 days/year. The obtained 6-year SI climatology showed a clear seasonal cycle with a winter maximum and a spring-summer minimum. The seasonal cycle was also characterized by an interannual variation. In particular, during winter (autumn), SI frequency could be related to the intensity of the positive (negative) NAO phase. In order to separate direct SI from indirect SI, a restrictive selection criterion was set. This criterion, named Direct Intrusion Criterion (DIC), requested that all the analyzed tracers were characterized by stratospheric values. Direct SI affected Mt. Cimone for about 6 days/year, with frequency peaks in winter and early summer. At Mt. Cimone, SI contribution to background ozone concentrations was largest in winter. On average, an ozone increase of 8% (3%) with respect to the monthly running mean was found during direct (indirect) SI. Finally, the typical variations of stratospheric tracers during SI events were analyzed. The analysis of in situ atmospheric pressure values suggested that direct SI were connected with intense fronts affecting the region, while indirect SI were possibly connected with subsiding structures related with anticyclonic areas. American Geophysical Union (AGU) +1 2024626900 +1 2023280566 2000 Florida Avenue N.W. Washington DC 20009-1277 United States of America service@agu.org http://www.agu.org Paolo Cristofanelli Institute of Atmospheric Sciences and Climate (ISAC) - CNR +39 0516399597 +39 0516399652 Via Gobetti,101 Bologna BO 40129 Italy p.cristofanelli@isac.cnr.it www.isac.cnr.it Paolo Bonasoni Institute of Atmospheric Sciences and Climate (ISAC) - CNR +39 0516399590 +39 0516399652 Via Gobetti,101 Bologna BO 40129 Italy p.bonasoni@isac.cnr.it www.isac.cnr.it Francesco Calzolari Institute of Atmospheric Sciences and Climate (ISAC) - CNR +39 0516399582 Via Gobetti,101 Bologna BO 40129 Italy F.Calzolari@isac.cnr.it www.isac.cnr.it Franco Marenco Physics Department, University of Genoa and Istituto Nazionale di Fisica Nucleare-Genova Via Dodecaneso 33 Genova GE 16146 marenco@fisica.unige.it http://www.fisica.unige.it/difi/ WWW:LINK-1.0-http--partners A. D'Alessandro Physics Department, University of Genoa and Istituto Nazionale di Fisica Nucleare-Genova, Via Dodecaneso 33 Genova GE 16146 Italy http://www.fisica.unige.it/difi/ WWW:LINK-1.0-http--partners F. Mazzei Physics Department, University of Genoa and Istituto Nazionale di Fisica Nucleare-Genova, +39 0103536325 +39 010314218 Via Dodecaneso 33 Genova GE 16146 Italy mazzei@ge.infn.it http://www.fisica.unige.it/difi/ WWW:LINK-1.0-http--partners Paolo Prati Physics Department, University of Genoa and Istituto Nazionale di Fisica Nucleare-Genova, +39 0103536439 Via Dodecaneso 33 Genova GE 16146 Italy prati@ge.infn.it http://www.ge.infn.it/~prati/ Massimo Chiari Physics Department, University of Florence and Istituto Nazionale di Fisica Nucleare-Firenze +39 0554572273 +39 0554572240 +39 0554572641 via Sansone 1 Sesto Fiorentino FI 50019 Italy chiari@fi.infn.it http://labec.fi.infn.it/ Franco Lucarelli Physics Department, University of Florence and Istituto Nazionale di Fisica Nucleare-Firenze +39 0554572274 Via Sansone 1 Sesto Fiorentino FI 50019 Italy lucarelli@fi.infn.it http://labec.fi.infn.it Silvia Nava Physics Department, University of Florence and Istituto Nazionale di Fisica Nucleare-Firenze +39 0554572727 Via Sansone Sesto Fiorentino FI 50019 Italy nava@fi.infn.it http://labec.fi.infn.it Paola Fermo Inorganic, Metallorganic and Analytical Chemistry Department, University of Milan, +39 0250314425 +39 0250314388 Via Venezian, 21 Milano MI Italy paola.fermo@unimi.it www.chimica.unimi.it Andrea Piazzalunga University of Milano-Bicocca,Faculty of Mathematics, Physics and Natural Sciences +39 0264482824 Piazza della Scienza 1, Milano MI 20126 Italy andrea.piazzalunga@unimib.it http://www.scienze.unimib.it/ G.Valli Physics Department, University of Milano and Istituto Nazionale di Fisica Nucleare-Milano Via Celoria 16 Milano MI 20133 Italy http://www.fisica.unimi.it/ Roberta Vecchi Physics Department, University of Milano and Istituto Nazionale di Fisica Nucleare-Milano +39 0250317498 +39 0250317496 Via Celoria 16 Milano MI 20133 Italy roberta.vecchi@unimi.it http://www.fisica.unimi.it/ https://geoportal.mountaingenius.org/geonetwork/srv/eng/resources.get?uuid=930108e1-3560-48af-bf40-d8686551f22f&fname=mountain_witness__s.png thumbnail png SHARE PM10 PM1 source apportionment aerosol composition back trajectories Saharan dust transport Mt. Cimone eng climatologyMeteorologyAtmosphere environment 6.62397 18.5144 36.6492 47.0946 http://www.agu.org/pubs/crossref/2006/2006JD007145.shtml WWW:LINK-1.0-http--partners Abstract:"Characterization of atmospheric aerosols at Monte Cimone, Italy, during summer 2004: source apportionment and transport mechanisms." https://geoportal.mountaingenius.org/webapp/srv/en/resources.get?id=37797&fname=cimone.pdf&access=private WWW:DOWNLOAD-1.0-http--download cimone.pdf Full text(pdf):""Characterization of atmospheric aerosols at Monte Cimone, Italy, during summer 2004: source apportionment and transport mechanisms" "Characterization of atmospheric aerosols at Monte Cimone, Italy, during summer 2004: Source apportionment and transport mechanisms" JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, D24202, 15 PP., 2006. Marenco, F., Bonasoni, P., Calzolari, F., Ceriani, M., Chiari, M., Cristofanelli, P., D’Alessandro, A., Fermo, P., Lucarelli, F., Mazzei, F., Nava, S., Piazzalunga, A., Prati, P., Valli, G., Vecchi, R.