NCAR Scientist Models Earth's Climate and Vegetation Patterns At Last Glacial Peak
...y massive ice sheets over Canada and Eurasia, with tundra covering much of Europe and North America as the S...1,000 years ago. The model shows fragile, treeless tundra covering most of Europe. Desert spread into the northern Rocky Mountains. A wetter Southwest still b...Can Plants Influence The Climate?
...nces of a change in the sub-arctic vegetation from tundra to borealforest. This is a commonly predicted scenario for high latitude regions underglobal change. He found that forests, which are darker than tundra, createwarmer temperatures in the subarctic. This allows boreal forests to survive highlatitude e...Fossil Footprints Show Foot-Movement Similarity In Dinosaurs And Birds
...cted fossils along rockyoutcrops overlooking tundra and fjords on Greenland's east coast....Arctic ecosystems being nibbled away
... rapidly and dry out, and the permafrost that most tundra ecosystems depend on can melt. While summer traffic is banned in the North American Arctic, winter traffic can also be damaging if the snow is thin. Similarly, pedestrian trampling can decrease plant biodiversity, for example favoring willows and ra...Rutgers helping Finns explore arctic microbes
..., a cold land of boreal forests and stark mountain tundra with long, dark winters, heavy snowfall and brief ... cold regions and help preserve fragile forest and tundra environments. "There is tremendous metabolic activity in the bacterial world," said Rutgers Profess...Livestock in salt marshes help farmers and geese
...ese depart from England and France to the Siberian tundra to breed. En route they descend on salt marshes and polders in the Wadden Sea area to eat young grass. Farmers noted that geese seemed to have a preference for grasslands with short vegetation. STW researchers at the University of Groningen havenow d...Increasing nitrogen in Earth's soils may signal global changes, say U. of Colorado researchers
...ld change that balance," he said. The study shows tundra soils are unexpectedly sensitive to added nitrogen...ases in atmospheric C02," said Townsend. "If cold tundra soils are sensitive to nitrogen, it raises concerns about what might be happening in other, warmer p...Climate change surprise: High carbon dioxide levels can retard plant growth, study reveals
... what will happen to other ecosystems from alpine tundra to tropical rainforests. "In the past, people have argued that perhaps we don't really need to worry about fossil fuel emissions, because increased plant growth will effectively pull elevated CO2 concentrations out of the atmosphere and keep the worl...UAF Institute of Arctic Biology researcher featured in Science
...l processes operating within a field of cyberspace tundra to create sorted polygons and stripes. The three critical processes identified by Kessler and Werner are frost heaving, the upward squeezing of domains of stones heaved out of the soil and the gravitational sorting of stones piled up by heaving. Toge...Alaska oil and gas exploration good and bad for area life
...nd those outside the area. *Damage to tundra. The tundra has been damaged by the geophysical survey techniques that are critical to oil exploration efforts. *Animal population. Because human food is available in oil fields despite efforts to control food stuffs, more predators (brown bears, arctic foxes, ...50 Arctic lakes show dramatic effects of climate warming
... regions. Earlier PEARL studies in the High Arctic tundra had indicated major changes in the different layers of fossils associated with climate warming. The new findings bring the effects of climate change closer to populated areas. "The logical extension was to see if tree-line lakes also show these drama...U. of Colorado scientists discover four new kingdoms of life
...the new microbe kingdoms in barren, boulder-filled tundra slopes west of Boulder. At altitudes of 11,000 feet to 13,000 feet in elevation just east of the Continental Divide, the region is subject to nine months of snow and three months of intense sun and wind, said Meyer. Although scientists in the 18th ce...Story tips from the Department of Energy's Oak Ridge National Laboratory, September 2003
...individual fungi in these processes. Surprisingly, tundra soil - about the top 10 centimeters - reaches its annual peak number of active microorganisms beneath the snow. This is significant because snow-covered microbial metabolism is an important biogeochemical sink for nitrogen, and the subsequent release...New Colorado U. study shows increase in fungal metabolism under the snow
...der study has shown that microbes living under the tundra snow pack ramp up their populations in late winter...areas for extended periods." In analyzing the cold tundra soil on Niwot Ridge west of Boulder, the researchers discovered several major new groups of fungi us...Microbes active in Colorado snows fuel tundra ecosystem
...are likely responsible for the productivity of the tundra ecosystem they are a part of, according to finding...rprisingly, the number of active microorganisms in tundra soils, for at least the top 10 centimeters, (about four inches) peaks when the soils are covered wit...Northern climate, ecosystems driven by cycles of changing sunlight
...The new data come from Arolik Lake sediment in the tundra region near the Ahklun Mountains, along the southwestern coast of Alaska. Hu and co-author Darrell Kaufman of Northern Arizona University in Flagstaff have conducted climate-change research in that region for more than a decade. "To our knowledge, th...Researchers publish Circumpolar Arctic Vegetation Map
...ee line, with an arctic climate, arctic flora, and tundra vegetation. The map can be viewed on the Web at http://www.geobotany.uaf.edu/cavm/ . The 3-foot by 4-foot, waterproof, tear-proof, field-work-worthy, synthetic-paper map is as beautiful as it is useful. The front of the map shows the circumpolar Arc...NASA scientists discover spring thaw makes a difference
... in North America and Eurasia's boreal forests and tundra to decipher effects on the timing and length of th...mafrost soils. Large expanses of boreal forest and tundra are underlain by permafrost, a layer of permanently frozen soil found underneath the active, seasona...Digital evolution reveals the many ways to get to diversity
... are harsh and short on resources like the arctic tundra or a desert have comparatively little species diversity, not surprisingly perhaps. Unexpectedly, however, some natural environments that have a lot of resources support fewer species than environments that have more modest productivity, a surprising......he most visible in the world," Bachelet said. "The tundra has no place else to go, and it will largely disap...west research suggests that 90 percent of Alaska's tundra that was present in 1920 will be gone by 2100, less than a century from now, under one of the climat...