Analyses and comparisons of variations of 7Be, 210Pb, and 7Be/210Pb with ozone observations at two Global Atmosphere Watch stations from high mountains

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.
 
Citation proposal
Hsi-Na (Sam) Lee (Environmental Measurement Laboratory, U.S. Department of Energy) - Laura Tositti (Environmental Radiochemistry Laboratory, Chemistry Department, Bologna University,) - Xiang Dong Zheng (Laboratory of Atmospheric Chemistry, CMA, Chinese Academy of Meteorological Sciences) - Paolo Bonasoni (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) (2007) . Analyses and comparisons of variations of 7Be, 210Pb, and 7Be/210Pb with ozone observations at two Global Atmosphere Watch stations from high mountains. American Geophysical Union (AGU) https://geoportal.mountaingenius.org/geonetwork/srv/api/records/61144917-d1fb-46f0-b1c5-48edd56573da
 

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61144917-d1fb-46f0-b1c5-48edd56573da   XML
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eng
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  • Elevation
  • Climatology, meteorology, atmosphere
  • Environment
 

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  • SHARE
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  • 7Be , surface ozone , transport processes , 210Pb , 7Be/210Pb
Keywords ( Place )
  • Mount Cimone , Mount Waliguan , Italy , China
 
 

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2007-03-08T00:00:00
 

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“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.

 

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American Geophysical Union (AGU)
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service@agu.org
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Environmental Measurement Laboratory, U.S. Department of Energy
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hnlee@eml.doe.gov
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Environmental Radiochemistry Laboratory, Chemistry Department, Bologna University,
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laura.tositti@unibo.it
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Laboratory of Atmospheric Chemistry, CMA, Chinese Academy of Meteorological Sciences
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zhengxd@cams.cma.gov.cn
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Institute of Atmospheric Sciences and Climate (ISAC) - CNR
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p.bonasoni@isac.cnr.it
 

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American Geophysical Union (AGU)
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service@agu.org
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Environmental Measurement Laboratory, U.S. Department of Energy
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hnlee@eml.doe.gov
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Environmental Radiochemistry Laboratory, Chemistry Department, Bologna University,
Email
laura.tositti@unibo.it
Organisation name
Laboratory of Atmospheric Chemistry, CMA, Chinese Academy of Meteorological Sciences
Email
zhengxd@cams.cma.gov.cn
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Institute of Atmospheric Sciences and Climate (ISAC) - CNR
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p.bonasoni@isac.cnr.it
 

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Ev-K2-CNR
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metadata@evk2cnr.org
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2012-03-08T15:58:51
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eng
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UTF8
 
 

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