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Ann. Geophys., 26, 1181-1187, 2008
www.ann-geophys.net/26/1181/2008/
© European Geosciences Union 2008
Global change induced trends in ion composition of the troposphere to the lower thermosphere
G. Beig
Indian Institute of tropical Meteorology, Pashan, Pune-411008, India
Abstract. In this paper a brief overview of the changes in atmospheric ion
compositions driven by the human-induced changes in related neutral species,
and temperature from the troposphere to lower thermosphere has been made. It
is found that ionic compositions undergo significant variations. The
variations calculated for the double-CO2 scenario are both long-term
and permanent in nature. Major neutrals which take part in the lower and
middle atmospheric ion chemical schemes and undergo significant changes due
to anthropogenic activities are: O, O2, H2O, NO, acetonitrile,
pyridinated compounds, acetone and aerosol. The concentration of positive
ion/electron density does not change appreciably in the middle atmosphere
but indicates a marginal decrease above about 75 km until about 85 km, above
which the magnitude of negative trend decreases and becomes negligible at 93 km.
Acetonitrile cluster ions in the upper stratosphere are likely to
increase, whereas NO+ and NO+(H2O) in the mesosphere and lower thermosphere (MLT) region are
expected to decrease for the double CO2 scenario. It is also found that the
atmospheric density of pyridinated cluster ions is fast rising in the
troposphere.
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