The latitudinal distribution of the annual average 7Be concentrations
in near-surface atmospheric aerosols in the East Asian
monsoon zone in China follows a trend similar to that of a normal
distribution in Europe, with the maximum occurring at ~40N. The
short-term observations of 7Be made simultaneously at various
latitudes in the EAMCS also showed a similar trend but the
maximum occurred at ~30N in autumn and spring. The nearsurface
atmospheric 7Be concentrations were lower in winter and
summer. The peak position shifted northward in summer with
peaks at ~40N and double peaks occurred in winter at ~30N
and ~40N.
The annual 7Be atmospheric deposition fluxes in the East Asian
monsoon zone in China showed the maximum at mid-latitude,
40N, consistent with the latitudinal distribution pattern of the
near-surface atmospheric aerosol concentrations of 7Be. The 7Be
atmospheric deposition fluxes are controlled by latitude, rainfall,
and dry precipitation and on a larger scale by atmospheric circulations.
The contribution of dry precipitation to the 7Be deposition
fluxes in Beijing cannot be ignored, particularly in the spring. In the
mid-latitude cities of Beijing and Qingdao, 7Be deposition fluxes
were subject to larger seasonal variations than those at high and
low latitudes. Rainfall amount is the main factor controlling 7Be
deposition fluxes at particular latitude No obvious regularitywas noted in the latitudinal distribution of
the 7Be inventory in undisturbed soils in China in summer. In the
East Asian monsoon region in China, a higher 7Be soil inventorywas
observed in the mid-latitude Changbai Mountain area in summer,
which may be attributed to the high amount of rainfall in this area
in summer. The low-latitude city Guangzhou showed the lowest
7Be soil inventory in summer despite the high amount rainfall in
this area. Changes in soil 7Be soil inventory may be affected by
factors such as rainfall and 7Be concentrations in aerosols. These
results may provide a reference framework for regional scale fallout
of aerosol-bound pollutants in atmosphere in the East Asian