Posts Tagged Professor
Wind farms can cause climate change, finds new study – Telegraph
Posted by Michael B. Calyn in Ecology on April 30, 2012
Wind farms can cause climate change, finds new study
Wind farms can cause climate change, according to new research, that shows for the first time the new technology is already pushing up temperatures.

Wind farms can cause a rise in temperature, found a study in Nature. Photo: Alamy

By Louise Gray, Environment Correspondent
29 Apr 2012
Usually 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 environment.
“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 Texas.
“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 morning frosts.”
Wind farms can cause climate change, finds new study – Telegraph.
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- Wind Farms Linked to Local Climate Change [Climate] (gizmodo.com)
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- Temperature changes linked to wind farms (abc.net.au)
- New Study Suggests Wind Farms Can Cause Climate Change (news.slashdot.org)
- Turbine trouble over researchers’ bad wind (slashgear.com)
- Wind farms can cause climate change finds new study (telegraph.co.uk)
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Computer game helps kids with depression | News24
Posted by Michael B. Calyn in Medical, Social, Society on April 20, 2012
Computer game helps kids with depression
2012-04-20
Paris – A computer game designed to lift teenagers out of depression is as effective as one-on-one counselling, New Zealand doctors reported on Thursday in the British Medical Journal (BMJ).
Researchers at the University of Auckland tested an interactive 3D fantasy game called Sparx on a 94 youngsters diagnosed with depression whose average age was 15 and a half.
Sparx invites a user to take on a series of seven challenges over four to seven weeks in which an avatar has to learn to deal with anger and hurt feelings and swap negative thoughts for helpful ones.
Used for three months, Sparx was at least as effective as face-to-face conventional counselling, according to several depression rating scales.
In addition, 44% of the Sparx group who carried out at least four of the seven challenges recovered completely. In the conventional treatment group, only 26% recovered fully.
“Use of the programme resulted in a clinically significant reduction in depression, anxiety and hopelessness, and an improvement in quality of life,” according to the study led by Sally Merry, an associate professor at the Department of Psychological Medicine.
The adolescents also gave a high rating to Sparx, saying they liked being able to use it at home and to learn at their own pace.
Eighty percent said they would recommend the computer therapy to others, although the treatment-as-usual group had similarly high approval ratings.
Computer game helps kids with depression | News24.
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- Young Depressive Patients Respond To Computer Therapy – Medical News Today (medicalnewstoday.com)
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- Computer therapy works for young people with depression (eurekalert.org)
- Video Game May Help Treat Teen Depression (teens.webmd.com)
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