61144917-d1fb-46f0-b1c5-48edd56573da 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/ 2012-03-08T15:58:51 ISO 19115:2003/19139 1.0 Analyses and comparisons of variations of 7Be, 210Pb, and 7Be/210Pb with ozone observations at two Global Atmosphere Watch stations from high mountains 2007-03-08T00:00:00 JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, 2007 D05303 11 PP. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, D05303, 11 PP., 2007 0148–0227 Simultaneous measurements of 7Be and 210Pb and the analyses of activity ratio, i.e., 7Be/210Pb, offer another useful analytical tool for improving our understanding of ozone variability occurring at high altitude because they can provide diagnostic indicators of horizontal and vertical transport processes. Generally, the increase (decrease) of 7Be with decrease (increase) of 210Pb in association with high (low) values of 7Be/210Pb indicates the mechanisms associated with vertical (for being favorable to the horizontal) transport processes. For the purpose of demonstrating these mechanisms for ozone transport, we have presented the distinct transport processes of ozone and background conditions for two Global Atmosphere Watch (GAW) stations: Mount Cimone station (44.18°N, 10.7°E, 2165 m asl) and Mount Waliguan station (36.29°N, 100.90°E, 3816 m asl), located high in the mountains of Italy and China, respectively. We have performed the frequency distribution analyses and various comparisons of variations of 7Be with 210Pb and variations of 7Be, 210Pb, and 7Be/210Pb with surface ozone. The maximum ozone levels occur in the summer, and minimum levels occur in the winter at these two high mountain stations. Our analyses suggest that the processes of the stratospheric intrusions/upper tropospheric transport combined with the long-range transport from polluted areas over eastern central China are the mechanisms that cause the ozone summer peak at the Mount Waliguan station. The ozone summer peak at the Mount Cimone station is mainly the result of photochemical production in the lower atmosphere associated with the transport of polluted air masses on regional and continental scales. Frequency distributions of 7Be, 210Pb, 7Be/210Pb, and surface ozone can be well represented by the lognormal distributions. Strikingly, we have found that the similarities of bimodal distributions for 7Be/210Pb at these two stations are clearly exhibited except for the magnitude, although the lognormal distributions of 7Be and 210Pb, with the noteworthy difference in altitude of these two stations, are significantly different. The measurements of 7Be and 210Pb combined with the analyses using 7Be/210Pb activity ratio can enhance our understanding of the transport processes in the atmosphere. 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 WWW:LINK-1.0-http--related Hsi-Na (Sam) Lee Environmental Measurement Laboratory, U.S. Department of Energy 201 Varick Street New York New York NY 10014-4811 United States of America hnlee@eml.doe.gov http://www.nbl.doe.gov/htm/EML_Legacy_Website/index.htm WWW:LINK-1.0-http--partners Laura Tositti Environmental Radiochemistry Laboratory, Chemistry Department, Bologna University, +39 0512099488 +39 0512099456 Via Selmi,2 Bologna BO 40126 Italy laura.tositti@unibo.it http://www.chimica.unibo.it/Chimica/default.htm Xiang Dong Zheng Laboratory of Atmospheric Chemistry, CMA, Chinese Academy of Meteorological Sciences 46 Zhong Guan Cun S. Ave. Beijing 100081 China, Mainland zhengxd@cams.cma.gov.cn 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 https://geoportal.mountaingenius.org/geonetwork/srv/eng/resources.get?uuid=61144917-d1fb-46f0-b1c5-48edd56573da&fname=mountain_witness__s.png thumbnail png SHARE 7Be surface ozone transport processes 210Pb 7Be/210Pb Mount Cimone Mount Waliguan Italy China eng elevation climatologyMeteorologyAtmosphere environment -180 180 -90 90 http://www.agu.org/pubs/crossref/2007/2006JD007421.shtml WWW:LINK-1.0-http--related Abstract:“Analyses and comparisons of variations of 7Be, 210Pb, and 7Be/210Pb with ozone observations at two Global Atmosphere Watch stations from high mountains”. “Analyses and comparisons of variations of 7Be, 210Pb, and 7Be/210Pb with ozone observations at two Global Atmosphere Watch stations from high mountains”. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, D05303, 11 PP., 2007 Lee, H.N., Tositti, L., Zheng, X.D., Bonasoni, P.