Tag Archives: global warming

Improved Measurements of Sun to Advance Understanding of Climate Change

By Guest PostJanuary 17, 2011Environment, Scienceamount of energy, anthropogenic causes of climate change, calibration facility, climate change, climate respond, earth, global temperature, global warming, greg kopp, industrial revolution, judith lean, laboratory, NASA, optical design, planet, satellite data, solar fluctuations, solar irradiance, solar radiation and climate experiment spacecraft, sorce, spacecraft easurements, sun, tim, total irradiance monitor, total solar irradiance, tsi, tsi value

WASHINGTON — Scientists have taken a major step toward accurately determining the amount of energy that the sun provides to Earth, and how variations in that energy may contribute to climate change.

In a new study of laboratory and satellite data, researchers report a lower value of that energy, known as total solar irradiance, than previously measured and demonstrate that the satellite instrument that made the measurement—which has a new optical design and was calibrated in a new way—has significantly improved the accuracy and consistency of such measurements. (more…)

Ice-Age Reptile Extinctions Provide a Glimpse of Likely Responses to Human-Caused Climate Change

By Guest PostDecember 13, 2010Environment, Natureaegean islands, anthony ives, chances of survival, climate, climate change, ecologist, environmental conditions, extinctions, global warming, greek, greek islands, ice age, johannes foufopoulos, lizards, mediterranean sea, moisture levels, reptile, reptile populations, reptile species, sea levels, snakes, southern hemisphere, turtles

ANN ARBOR, Mich. — A wave of reptile extinctions on the Greek islands over the past 15,000 years may offer a preview of the way plants and animals will respond as the world rapidly warms due to human-caused climate change, according to a University of Michigan ecologist and his colleagues.

The Greek island extinctions also highlight the critical importance of preserving habitat corridors that will enable plants and animals to migrate in response to climate change, thereby maximizing their chances of survival. (more…)

Time Running Out to Save Climate Record Held in Unique Eastern European Alps Glacier

By Guest PostDecember 12, 2010Environmentalto dell ortles, ancient climate, climatic change, core, drill, eastern alps, eastern european alps, ecosystems, glacier, global warming, ground penetrating radar, high altitude sites, ice, ice field, ohio state university, ortles site, paolo gabrielli, thickness of the glacier

COLUMBUS, Ohio – A preliminary look at an ice field atop the highest mountain in the eastern European Alps suggests that the glacier may hold records of ancient climate extending back as much as a thousand years.

Researchers warn, however, that the record may soon be lost as global warming takes its toll on these high-altitude sites, according to a new study in the Journal of Glaciology.

The glacier, Alto dell’Ortles, is the highest large ice body in the eastern Alps, reaching an altitude of 12,812 feet (3,905 meters) above sea level. It is small, though, measuring barely 0.4 square miles (1.04 square kilometers), and only 10 percent of that is likely to hold a good climate record, the researchers said. (more…)

Biologists Report More Bad News for Polar Bears

By Guest PostNovember 24, 2010Environment3-d computer models, brown bears, climate change, ecology, Environment, extreme environment, genetic studies, global warming, graham slater, grizzly bears, ice ages, polar bears, van valkenburgh, vegetables

*Climate change will force them south, where they are unsuited for the diet*

A polar bear breaks through thin Arctic Ocean ice Aug. 23, 2009. Image credit: Canadian Coast Guard/USGS

Will polar bears survive in a warmer world? UCLA life scientists present new evidence that their numbers are likely to dwindle.

As polar bears lose habitat due to global warming, these biologists say, they will be forced southward in search of alternative sources of food, where they will increasingly come into competition with grizzly bears.

To test how this competition might unfold, the UCLA biologists constructed three-dimensional computer models of the skulls of polar bears and grizzly bears — a subspecies of brown bears — and simulated the process of biting. The models enabled them to compare the two species in terms of how hard they can bite and how strong their skulls are. (more…)

Tropical Forest Diversity Increased During Ancient Global Warming Event

By Guest PostNovember 18, 20101 commentEnvironment, Nature, Scienceangiosperm pollen, atmospheric carbon dioxide, carlos jaramillo, century, Colombia, eldredge bermingham, global warming, joe wright, outcrops, paleocene-eocene thermal maximum, panama, rainforests, scanning electron microscopy image, taxa, temperature increase, tropical areas, Venezuela

The steamiest places on the planet are getting warmer. Conservative estimates suggest that tropical areas can expect temperature increases of 3 degrees Celsius by the end of this century. Does global warming spell doom for rainforests? Maybe not. Carlos Jaramillo, staff scientist at the Smithsonian Tropical Research Institute, and colleagues report in the journal Science that nearly 60 million years ago rainforests prospered at temperatures that were 3-5 degrees higher and at atmospheric carbon dioxide levels 2.5 times today’s levels.

About the image: This is a scanning electron microscopy image of characteristic angiosperm pollen taxa from the Paleocene-Eocene Thermal Maximum. Image credit: Francy Carvajal, Smithsonian Tropical Research Institute (more…)

Researchers Find Ocean Temperature Threshold for Hurricanes is Rising

By Guest PostNovember 10, 2010Environmentatmospheric convection, climate model, global warming, hurricanes, nat Johnson, rainfall, sea surface temperature, shang ping xie, sst, threshold, tropical atmosphere, tropical ocean thunderstorms

Average observed tropical (black) and estimated SST (blue) rose together in the last 30 years. Image credit: University of Hawaii at Mānoa

Scientists have long known that atmospheric convection in the form of hurricanes and tropical ocean thunderstorms tends to occur when sea surface temperature rises above a threshold. So how do rising ocean temperatures with global warming affect this threshold? If the threshold does not rise, it could mean more frequent hurricanes.

A new study by researchers at the International Pacific Research Center (IPRC) of the University of Hawaii at Mānoa shows this threshold sea surface temperature for convection is rising under global warming at the same rate as that of the tropical oceans. Their paper appears in the Advance Online Publications of Nature Geoscience. (more…)

The More We Talk, The Less We Might Agree: Study Shows Discussion Can Hurt Consensus-Building On Science/Technology

By Guest PostNovember 4, 2010Culture, Scienceandrew binder, dietram scheufele, global warming, large-scale research initiatives, manhattan, nbaf, north carolina state university, plum island, public consensus, public issues, san Antonio, science and technology, scientific endeavors, stem cell research, talking it out

When it comes to public issues pertaining to science and technology, “talking it out” doesn’t seem to work. A new study from North Carolina State University shows that the more people discuss the risks and benefits associated with scientific endeavors, the more entrenched they become in their viewpoint – and the less likely they are to see the merit of other viewpoints.

“This research highlights the difficulty facing state and federal policy leaders when it comes to high-profile science and technology issues, such as stem cell research or global warming,” says Dr. Andrew Binder, an assistant professor of communication at NC State and lead author of the study. “Government agencies view research on these issues as vital and necessary for the country’s future, but building public consensus for that research is becoming increasingly difficult.” (more…)

A Wiki for the Biofuels Research Community

By Guest PostOctober 31, 20101 commentEnvironmentbiofuels, biorefinery, blake simmons, carbon neutral, daniel klein marcuschamer, gasoline, global warming, green, harvey blanch, jbei, joint bioenergy institute, lignocellulosic biorefineries, parameters, piotr oleskowicz popiel, sustainable fashion, technoeconomic model, wiki based platform

Blake Simmons (left) and Harvey Blanch of the Joint BioEnergy Institute led the development of a technoeconomic model for optimizing biorefinery operations. Image cedit: Roy Kaltschmidt, Berkeley Lab Public Affairs

Researchers at the U.S. Department of Energy’s Joint BioEnergy Institute (JBEI) have created a technoeconomic model that should help accelerate the development of a next generation of clean, green biofuels that can compete with gasoline in economics and well as performance. This on-line, wiki-based model enables researchers to pursue the most promising strategies for cost-efficient biorefinery operations by simulating such critical factors as production costs and energy balances under different processing scenarios.

“The high production cost of biofuels has been the main factor limiting their widespread adoption,” says JBEI’s Daniel Klein-Marcuschamer. “We felt that a model of the biorefinery operation that was open, transparent about the assumptions it uses, and updatable by the community of users could aid in guiding research in the direction where it is most likely to reduce the production cost of biofuels.” (more…)