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Wind farms can cause climate change, according to new research, that shows for
the first time the new technology is already pushing up temperatures.
at night the air closer to the ground becomes colder when the sun goes down and
the earth cools.
But on huge wind farms the motion of the turbines mixes the air higher in the
atmosphere that is warmer, pushing up the overall temperature.
Satellite data over a large area in Texas, that is now covered by four of the
world's largest wind farms, found that over a decade the local temperature went
up by almost 1C as more turbines are built.
This could have long term effects on wildlife living in the immediate areas of
larger wind farms.
It could also affect regional weather patterns as warmer areas affect the
formation of cloud and even wind speeds.
It is reported China is now erecting 36 wind turbines every day and Texas is
the largest producer of wind power in the US.
Liming Zhou, Research Associate Professor at the Department of Atmospheric and
Environmental Sciences at the University of New York, who led the study, said
further research is needed into the affect of the new technology on the wider
"Wind energy is among the world’s fastest growing sources of energy. The US wind
industry has experienced a remarkably rapid expansion of capacity in recent
years,” he said. “While converting wind’s kinetic energy into electricity, wind
turbines modify surface-atmosphere exchanges and transfer of energy, momentum,
mass and moisture within the atmosphere. These changes, if spatially large
enough, might have noticeable impacts on local to regional weather and climate.”
The study, published in Nature, found a “significant warming trend” of up to
0.72C (1.37F) per decade, particularly at night-time, over wind farms relative
to near-by non-wind-farm regions.
The team studied satellite data showing land surface temperature in west-central
“The spatial pattern of the warming resembles the geographic distribution of
wind turbines and the year-to-year land surface temperature over wind farms
shows a persistent upward trend from 2003 to 2011, consistent with the
increasing number of operational wind turbines with time,” said Prof Zhou.
However Prof Zhou pointed out the most extreme changes were just at night and
the overall changes may be smaller.
Also, it is much smaller than the estimated change caused by other factors such
as man made global warming.
“Overall, the warming effect reported in this study is local and is small
compared to the strong background year-to-year land surface temperature
changes,” he added.
The study read: "Despite debates regarding the possible impacts of wind farms on
regional to global scale weather and climate, modelling studies agree that they
can significantly affect local scale meteorology."
Professor Steven Sherwood, co-Director of the Climate Change Research Centre at
the University of New South Wales, said the research was ‘pretty solid’.
“This makes sense, since at night the ground becomes much cooler than the air
just a few hundred meters above the surface, and the wind farms generate gentle
turbulence near the ground that causes these to mix together, thus the ground
doesn't get quite as cool. This same strategy is commonly used by fruit growers
(who fly helicopters over the orchards rather than windmills) to combat early