Tag: "glaciers" at biology news
Duke Geologists Explore Alternative Way To Measure Ice Age Sea Bottom Temperatures
...er oxygen 16 tends to get preferentially stored in glaciers
when seawater evaporates and later precipitates as snow or ice. Since foraminifera also reside in seawater, and preserve an isotopic record of its composition, those that lived during glacial times should have higher ratios of oxygen 18 than those th...
14,000 Years Of Atmospheric Lead Emissions Recorded In Swiss Peat Bog As Published In Science Magazine
...e lead was fromdust in Scandinavia released as the glaciers
receded or from lead ore broughtinto Europe from Australia and released through industrial use. The researchers found that the release of lead to the atmosphere,probably from soil erosion produced when early peoples cleared land foragricultur...
The Comet That Wiped Out The Dinosaurs May Have Washed Up Boulders Onto Hills In Arkansas
...ushed into position by glaciers, for instance. But glaciers
nevercame that far south, he says. A river could have moved the rocks, but its powerwould have been such that it would have left other visible signs. "There aren't any other known agents that could transport theseboulders, besides something l...
Largest Acoustics Meeting In History Expected
...tists and others are concerned that the melting of glaciers
and rises in sea level would drastically alter the world's climate. To measure climate variability and look for signs of global warming in this part of the world, a Norway-UK-Germany-Russian collaboration has embarked on a program called AMOC short ...
USGS will re-evaluate its Alaska strategy
...tal areas need further research. Changes toArctic glaciers
have profound global implications. Earthquake and volcanohazards pose substantial risks for Anchorage and for international air travel." Groat noted that in spite of the fact that the USGS has been mapping andconducting scientific field rese...
Astrobiologist to hunt small game in Siberia
...icrobial extremophiles in the Arctic and Antarctic glaciers
andpermafrost represent analogs for cells that mig...t we have found inpermafrost and on ice wedges and glaciers
and the viable but long dormant,ancient microorganisms that can be cultured from permafrost, glacier...
Team led by MSU biologist finds bacteria deep in Antarctic ice
...s of water and one ofabout 70 lakes underneath the glaciers
of central Antarctica. The bacteria, commonly associated with soils, are related to microbes calledproteobacteria and actinomycetes. They could have been blown on bits of soil from the Patagonian desertsonto the East Antarctic ice sheet and then b...
November GEOLOGY and GSA TODAY highlights
... profile evolution. K.R. MacGregor et al. Valley glaciers
are very important in shaping mountainous landscap...assic U-shaped valley cross section. In addition, glaciers
can enhance local valley relief, generate multiple steps and overdeepenings of valley floors, and th...
Ancient underground fractures may threaten ground water supplies
... other material left behind by glaciers
that covered much of the state during the last ... "Any land areas once covered by glaciers
should be screened for fractures," she said, "particularly if those areas are ca...
Global change conference sets the scene for next round of Kyoto Protocol talks
...signs that the Earth is rapidly changing. Tropical glaciers
are melting fast and some will disappear within 15 years if current warming trends continue. Fifty percent of the land surface has been modified and more than half the worlds accessible freshwater is being used directly or indirectly by humans. These...
Tropical glaciers formed while earth was giant snowball
...million years ago, lead to questions about how the glaciers
that left the deposits were created. Now, Penn State geoscientists believe that these glaciers
could only have formed after the Earth's oceans were entirely covered by thick sea ice. "There i...
Humans hunted mammals to extinction in North America
...y were able to move into what is now Canada as the glaciers
melted. These animals may also have developed more ways to avoid humans since they co-evolved with humans here, in Europe and Asia, he said....
Top environment scientist calls for early warning system for global change.
...s global warming - are real and here now. Tropical glaciers
are melting at an accelerating rate, the sea ice in the Arctic Ocean is thinning and the chemistry of the atmosphere is changing. Scientists fear that the future may see the occurrence of more damaging disturbances, such as wildfires, as the Earth's ...
NU scientist finds answers in Antarctic icefish
...he height of the Antarctic winter, he trawls among glaciers
and icebergs for the 15 species of icefishes, the only vertebrate taxonomic group that does not produce red blood cells or hemoglobin. While most of the world took warmth and natural light for granted last month, Detrich and his colleagues were find...
Antarctic mud reveals ancient evidence of global climate change
...limate change in Antarctica - from rapidly melting glaciers
to unexplained declines in penguin populations. Records show that average winter temperatures are 10 degrees higher in parts of Antarctica today than they were 50 years ago. If that warming trend continues, say many climate experts, the vast Antarct...
Fish may show how nature diversifies
...e, which occurred 15,000 years ago. When the giant glaciers
melted, they created thousands of lakes and streams in North America, Europe, and Asia. These waters were colonized by the sticklebacks marine ancestors, which adapted to life in fresh water. The spiny fish, which are one- to six-inches long, were re...
NSF to support study of environmental warming in the Arctic
...the extent and thickness of sea ice havedecreased, glaciers
are melting more rapidly and air temperaturesare warmer. Other changes include different varieties of plantcommunities, warmer subsurface ocean currents and differentprecipitation patterns. All of these affect animal habitats andmigration routes. ...
Sea levels likely to rise higher than IPCC predictions
...and Ice," at the AAAS Annual Meeting. The world's glaciers
and ice caps have been shrinking faster since the ...ding to Meier, the projections don't consider that glaciers
seem to be growing increasingly sensitive as air temperatures get warmer. In addition, smaller glaci...
May media highlights: GEOLOGY and GSA TODAY
... authors analyzed how climate has varied since the glaciers
retreated from North America. They studied pollen diagrams from across North America, which record changes of the vegetation in response to climate variations. The authors show that before the current warming caused by human activities, there were ma...
Non-native earthworms may be wiping out rare plants
... of Conservation Biology. About 10,000 years ago, glaciers
pushed the range of North American earthworms southward and today the only earthworms found in most of Minnesota are non-native species introduced from Europe. Some of these earthworms eat the top part of the soil (a layer of decomposing litter calle...