The drainage of the Great Russian Rivers Ob, Yenisei and
Lena has increased as a result of global warming. The annual amount that pours
into the Arctic Ocean lies, today, with about 1700 cubic kilometres per year
higher by about ten percent more than 60 years ago.
"It does not take too dramatic, but it is a long-term
trend exists,". The results are in the journal "Nature Climate
Change" published.
Consequence of the
air heating
The research had shown a correlation between the increase of
the water in the rivers and the large-scale changes in atmospheric circulation,
said a professor of physical oceanography. One factor is the heating of the
air. This could carry more water and lead to greater amounts of precipitation.
Also playing the past few years observed shift of the
Iceland-lows to the east a role. In addition, more frequent in Europe will be
the dominant zone flow replaced (along the latitude) by a meridional flow
(along the longitudes). "That means that more moisture is transported into
the influence of these rivers,".
The results fit well with the data according to the current
knowledge of climate change. The trend towards greater freshwater runoff in the
investigated area is expected to continue with the progress of global warming
continues.
In the long term
impact on European climate
The
current development is uncertain, however, there are enormous fluctuations from
year to year. The previous increase in the outflow had no greater impact on the
Arctic Ocean. Basically, could have very large amounts of fresh water, but the
influence on North Atlantic circulation, which influences the climate in Europe
significantly.
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