Tag: "glacial" at biology news
Duke Geologists Explore Alternative Way To Measure Ice Age Sea Bottom Temperatures
...record of its composition, those that lived during glacial
times should have higher ratios of oxygen 18 than ...es reflected in the oxygen ratio data for the last glacial
period seem improbably large. Those scientists suggest that what foraminifera oxygen ratios are real...
NCAR Scientist Models Earth's Climate and Vegetation Patterns At Last Glacial Peak
...ncestors would have wandered among during the last glacial
maximum (LGM) 21,000 years ago. Felzer presented h... around the sun. The cold temperatures of the last glacial
maximum resulted from the existence of the continental ice sheets and were intensified by reduced am...
Stronger Evidence That Global Climate Change Can Reduce The Variety Of Life
...ll in thenumber of species of ostracodes during 11 glacial
cycles suggests that theeffects of any future glob...h tilt), while diversity dropssignificantly during glacial
periods when global ice sheets expand in size(low tilt). The mechanisms that cause diversity...
Minuscule Ocean Plants Help Stabilize Earth's Atmosphere, Climate
...he fact that carbon dioxide increased rapidly when glacial
periodsended is also consistent with the argument that rapidly recycling phytoplanktonhad at least some role, the authors wrote. If carbon dioxide-caused global warming melts some polar ice andincreases precipitation, some computer models sug...
ASU Professor Helps In Fight To Protect Japanese Pika Habitat
...t pikas are very precious as living fossils of the glacial
age,"said Toshimi Ichikawa, Morihiros wife, who founded the fan club. The 1,800-member fan club sponsors pika lectures and photography exhibits,and even sews furry replicas for tourist souvenirs. Although cute, livingpikas make lousy pets, notes Smit...
Oldest Ice Core From The Tropics Recovered, New Ice Age Evidence
... the bottom of the cores was formed during thelast glacial
maximum -- the coldest part...ast ice age-- the last glacial
maximum (LGM). The abrupt beginning and end of a Younger-Dryas-type even...
First North Americans Had Chance To Be Avid Birders
...ern United States was covered with kilometre-thick glacial
ice. Conducted by scientists from the Canadian Mus...e during, and shortly after, theheight of the last glacial
period contradicts earlier ideas that the region wasa marginal habitat. "The richness of the avian f...
Fossilized Emu Eggshells Give Clues To 65,000 Years Of Vegetation And Climate Changes In Australia
... and 15,000 years ago, during the peak of the last glacial
period, C4 grasses were almost totally absent beca...ances were below the levels established before the glacial
period. Over the last 65,000 years, the researchers conclude, environmental factors other than clima...
Catastrophic draining of huge lakes tied to ancient global cooling event
The catastrophic draining of two gigantic glacial
lakes in Canada'sHudson Bay region some 8,200 year...mes from "redbed" sediments underlying the ancient glacial
lakes that were carried some 800miles through the Hudson Strait by the massive freshwater plume, sai...
New UNC-CH study explains variations in onset of ice ages
... Scientists can date those Northern Hemisphere glacial
periods fairlyprecisely by drilling into the sea floor and measuring the amount of "heavy"oxygen present in sediment layers, he says. More heavy oxygen - oxygencontaining two additional neutrons in its nucleus compared with standard oxygen- correspon...
Astrobiologist to hunt small game in Siberia
...tabolic activity upon thawing after beingfrozen in glacial
ice or permafrost for thousands to millions of yea...yoconite holes?" Cryoconite holes can be temporary glacial
micro-Edens.Cryoconite holes occur in glacial
ice when dark rock on the surface of the iceget heated...
Huge Antarctic ice sheet could be in its death throes
... both thinned and decreased in area since the last glacial
maximum 20,000years ago. Ice covering the region once was as much as a half-mile thick in places. Landpreviously weighed down by the dense ice has elevated since being freed from itsburden. The timing of deglaciation was determined by carbon-14 dati...
Global warming may be delayed by increase in ocean silica
...rbon dioxide levels decreased by 30 percent during glacial
times, a significant change that has perplexed sci...s and becomes available for biological uptake. In glacial
times, the increased silica levels shifted species composition, changing the distribution of plankto...
Taking the pulse of giants: Detecting change and its consequences in western mountain ecosystems
...e supporting climatic change, including tree ring, glacial
ice and sedimentary records. Graumlich will outline the current trends in climate and tree growth and examine them in respect to long-term patterns of variability. She will also compare past patterns of climatic change and forest response to prospe...
October Geology and GSA Today highlights
...ome stable. This evidence is locked up in uplifted glacial
marine sediments, now uplifted by previously unknown tectonic processes to elevations of up to 1400 m above sea level. The issue concerning the stability of the ice sheet has been vigorously debated on the basis of conflicting evidence from the Trans...
Geological Society of America: Annual Meeting 2000
...iv., Tropical Andean climate change since the last glacial
maximum from lacustrine carbonates. APPLICATION OF HYDROLOGIC AND GEOLOGIC STUDIES TO THE PERFORMANCE OF A POTENTIAL GEOLOGIC REPOSITORY AT YUCCA MOUNTAIN, NEVADA (T79) Sponsored by the United States Dept. of Energy RSCC Room B2, Thurs., Nov. 1...
November GEOLOGY and GSA TODAY highlights
...high above trunk valley floors. These distinctive glacial
signatures, seen in virtually every mountain range...of thousands of years of subglacial erosion. This glacial
erosion occurs during periods of dramatic swings in climate, which drives significant advances and r...
Changes in Australian ecosystems tied to arrival of exotic animals
...he past 25 years with those going back to the last glacial
maximum 15,000 years to 30,000 years ago and even ...5,000 years ago, he said. "Not even at the last glacial
maximum has the proportion of emu diet of grasses been so small," he said. "We suggest unprecedente...
Ancient underground fractures may threaten ground water supplies
...lls because of the presence of glacial
tills - the soil, rocks and other material left ... Christy said. While scientists once thought these glacial
tills were nearly impermeable to wastes, the discovery of fr...
Lake Titicaca study sheds new light on global climate change
... and continuously overflowing lake during the last glacial
stage,`` according to the Science study, ``signifying that the Altiplano of Bolivia and Peru and much of the Amazon basin were wetter than today.`` Then, about 15,000 years ago, the Altiplano underwent a significant change. A dry era was launched, ...
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