Farmers vs. scientists on the debate over climate change
November 11, 2014 01:48 PM - Purdue University
Crop producers and scientists hold deeply different views on climate change and its possible causes, a study by Purdue and Iowa State universities shows. Associate professor of natural resource social science Linda Prokopy and fellow researchers surveyed 6,795 people in the agricultural sector in 2011-2012 to determine their beliefs about climate change and whether variation in the climate is triggered by human activities, natural causes or an equal combination of both.
Study examines the role of the deep ocean in carbon dioxide storage
November 11, 2014 04:15 AM - Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research via ScienceDaily.
The Southern Ocean plays an important role in the exchange of carbon dioxide between the atmosphere and the ocean. One aspect of this is the growth of phytoplankton, which acts as a natural sponge for carbon dioxide, drawing the troublesome greenhouse gas from the atmosphere into the sea. When these plankton die they can sink to the bottom of the ocean and store some of the carbon dioxide they have absorbed, a process scientists call the "biological carbon pump."
Although many areas of the Southern Ocean are rich in nutrients, they often lack iron, which limits phytoplankton growth. An important idea in oceanography is that adding iron to the Southern Ocean could stimulate phytoplankton growth and the biological carbon pump. Some scientists believe that this process can partly explain cycles in atmospheric carbon dioxide over Earth's recent history and it has also been widely debated as a mitigation strategy for climate change.
MIT finds the missing piece of the climate modeling puzzle
November 10, 2014 02:58 PM - Genevieve Wanucha, Massachusetts Institute of Technology
In classrooms and everyday conversation, explanations of global warming hinge on the greenhouse gas effect. In short, climate depends on the balance between two different kinds of radiation: The Earth absorbs incoming visible light from the sun, called “shortwave radiation,” and emits infrared light, or “longwave radiation,” into space.
Upsetting that energy balance are rising levels of greenhouse gases, such as carbon dioxide (CO2), that increasingly absorb some of the outgoing longwave radiation and trap it in the atmosphere. Energy accumulates in the climate system, and warming occurs. But in a paper out this week in the Proceedings of the National Academy of Sciences, MIT researchers show that this canonical view of global warming is only half the story.
How would you feel if electric vehicles were the only ones allowed in center cities?
November 9, 2014 04:42 AM - , Electric Forum
The subject of making electric vehicles compulsory in city centres in the UK, and indeed many other areas of the world, is one which keeps popping up time and time again. The Liberal Democrat party in the UK has been pushing for greater adoption of electric vehicles within city centres and, don’t shout this, a ban on diesel and petrol vehicles. This is now something of a hot topic and one which will continue to appear in the political domain as we approach general and local elections.
How would you feel about making city centres a no-go area for petrol and diesel vehicles? Is electric vehicle technology of sufficient reliability to support such a dramatic and controversial move?
New Mechanism Behind Arctic Warming Revealed
November 6, 2014 08:06 AM - Editor, ENN
We all know that greenhouse gases contribute to global warming, but new research identifies a new mechanism that could turn out to be a major contributor to melting sea ice, specifically in the Arctic region. Scientists from the US Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) have studied a long-wavelength region of the electromagnetic spectrum called far infrared. Far infrared is a region in the infrared spectrum of electromagnetic radiation. While it is invisible to our eyes, it accounts for about half the energy emitted by the Earth’s surface.
Can ocean acidification have a positive effect on corals?
November 5, 2014 03:10 PM - Editor, ENN
A majority of recent reports highlights the negative effects of warmer water temperatures on corals. Because of increasing numbers of bleaching events, where corals become white resulting from a loss of their symbiotic algae, corals become stressed and can starve to death if the condition is prolonged. However, researchers from Northeastern University's Marine Science Center and the University of Chapel Hill have found some slightly positive effects that moderate ocean acidification and warming can have on coral.
The complicated relationship between ice sheets and climate
November 4, 2014 05:48 AM - University of Bristol
Heinrich events, in which large masses of icebergs rapidly broke free from ice sheets during the last ice age, are thought to have influenced global climate by interrupting ocean circulation patterns with a large influx of freshwater. However, new research from the University of Bristol suggests the variations in the height of the ice sheet that happen in these events might also influence global climate.
In a study published today in PNAS, Dr William Roberts of Bristol’s School of Geographical Sciences and colleagues use computer models to simulate a Heinrich event in Hudson Bay, Canada, adjusting the models to consider freshwater influx only, changing ice sheet height only or both factors together.
CO2 pulses and the last Ice Age
October 30, 2014 12:34 PM - Oregon State University
A new study shows that the rise of atmospheric carbon dioxide that contributed to the end of the last ice age more than 10,000 years ago did not occur gradually, but was characterized by three “pulses” in which C02 rose abruptly.
Scientists are not sure what caused these abrupt increases, during which C02 levels rose about 10-15 parts per million – or about 5 percent per episode – over a period of 1-2 centuries. It likely was a combination of factors, they say, including ocean circulation, changing wind patterns, and terrestrial processes.
"Shrinking goats" another indicator that climate change affects animal size
October 29, 2014 06:36 AM - Durham University
Alpine goats appear to be shrinking in size as they react to changes in climate, according to new research from Durham University. The researchers studied the impacts of changes in temperature on the body size of Alpine Chamois, a species of mountain goat, over the past 30 years. To their surprise, they discovered that young Chamois now weigh about 25 per cent less than animals of the same age in the 1980s.
Adélie penguin chick weights correlated to temperatures
October 28, 2014 01:11 PM - University of Delaware, via ScienceDaily.
Oceanographers have reported a connection between local weather conditions and the weight of Adélie penguin chicks. Adélie penguins are an indigenous species of the West Antarctic Peninsula (WAP), one of the most rapidly warming areas on Earth. Since 1950, the average annual temperature in the Antarctic Peninsula has increased 2 degrees Celsius on average, and 6 degrees Celsius during winter.
Adélie penguins are an indigenous species of the West Antarctic Peninsula (WAP), one of the most rapidly warming areas on Earth. Since 1950, the average annual temperature in the Antarctic Peninsula has increased 2 degrees Celsius on average, and 6 degrees Celsius during winter.
As the WAP climate warms, it is changing from a dry, polar system to a warmer, sub-polar system with more rain.