Geomagnetic field and climate variability. 2. Probable mechanism
© N.A Kilifarska, V.G. Bakhmutov, G.V. Melnyk, 2015
In this study we show that correspondence of the main structures of geomagnetic field, near surface air temperature and
surface pressure in the mid-latitudes, reported previously in the 1st part of the paper, has its physical foundation. The similar
pattern, found in latitude-longitude distribution of the lower stratospheric ozone and specific humidity, allows us to close the chain of
causal links, and to offer a mechanism through which geomagnetic field could influence on the Earth's climate. It starts with a
geomagnetic modulation of galactic cosmic rays (GCR) and ozone production in the lower stratosphere through ion-molecular
reactions initiated by GCR. The alteration of the near tropopause temperature (by O3 variations at these levels) changes the
amount of water vapour in the driest part of the upper troposphere/lower stratosphere (UTLS), influencing in such a way on
the radiation balance of the planet. This forcing on the climatic parameters is non-uniformly distributed over the globe, due
to the heterogeneous geomagnetic field controlling energetic particles entering the Earth's atmosphere.
Key words: main geomagnetic field, climate variability, galactic cosmic rays, ozone, troposphere.