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آخرينبعدي
  1395/10/29
   New Insights into North America's Midcontinent Rift
  NGDIR News Section-- The Midcontinent Rift has characteristics of a large igneous province, causing geologists to rethink some long-standing assumptions about how this giant feature formed. Some of the Midwest's most scenic vistas are the black volcanic cliffs that tower above the brilliant blue waters of Lake Superior's north shore. How these formed more than a billion years ago is an amazing story, illustrating one of plate tectonics' most important processes-how continents form and break u.....[More]
  1395/10/28
   Glaciers
  NGDIR News Section-- Article by Sara Bennett, geology instructor at Western Illinois University. What is a Glacier? A glacier is a slowly flowing mass of ice with incredible erosive capabilities. Valley glaciers (alpine glaciers, mountain glaciers) excel at sculpting mountains into jagged ridges, peaks, and deep U-shaped valleys as these highly erosive rivers of ice progress down mountainous slopes. Valley glaciers are currently active in Scandinavia, the Alps, the Himalayas, and in the moun.....[More]
  1395/10/27
   A tale of two droughts in California: Wetter in the north, still bone dry in the south
  NGDIR News Section-- When California water officials assess the drought, the first place they look is the northern Sierra Nevada mountains. Rain and snowmelt from the area feed into a complex system of rivers, canals and reservoirs that send water across the state. And by almost all measures, the drought picture in Northern California has dramatically improved over the last two months, as a series of storms have helped replenish the state's two major water projects. So far this season, rain l.....[More]
  1395/10/26
   NASA Releases New Eye-Popping View of Carbon Dioxide
  NGDIR News Section-- Using observations from NASA's Orbiting Carbon Observatory-2, scientists have developed a new model of carbon behavior in our atmosphere from Sept. 1, 2014, to Aug. 31, 2015. Such models can be used to better understand and predict where carbon dioxide concentrations could be especially high or low. A new NASA supercomputer project builds on the agency's satellite measurements of carbon dioxide and combines them with a sophisticated Earth system model to provide one of t.....[More]
  1395/10/25
   Frontiers in Cryoseismology
  NGDIR News Section-- Recent review provides timely and comprehensive resource for emerging field. Warming of the climate system is unequivocal, as is now evident from the wide range of observations-from the increase in global average air and ocean temperatures to the widespread melting of snow and ice in the polar regions to the global sea level rise. The cryosphere responds to these changes and provides clear signals about any alterations in the global climate; about 10% of the Earth's surfa.....[More]
  1395/10/22
   Earth's Magnetic Fields Could Track Ocean Heat: NASA
  NGDIR News Section-- As Earth warms, much of the extra heat is stored in the planet's ocean -- but monitoring the magnitude of that heat content is a difficult task. A surprising feature of the tides could help, however. Scientists at aNASA's Goddard Space Flight Center in Greenbelt, Maryland, are developing a new way to use satellite observations of magnetic fields to measure heat stored in the ocean. "If you're concerned about understanding global warming, or Earth's energy balance, a bi.....[More]
  1395/10/20
   This stunning Antarctic lake is buried in ice. And that could be bad news
  NGDIR News Section-- Atop the ice sheet covering the Arctic island of Greenland, you now see dramatic melting in the summer. It forms lakes, rivers and even dangerous "moulins" in the ice where rivers suddenly plunge into the thick ice sheet, carrying water deep below. East Antarctica is supposed to be different. It is extremely remote and cold. It doesn't see such warm temperatures in the summer- yet- and so its ice tends to remain more pristine. "Many people refer to East Antarctica as b.....[More]
  1395/10/19
   NASA/USGS Provide Global View of Speed of Ice
  NGDIR News Section-- Glaciers and ice sheets move in unique and sometimes surprising patterns, as evidenced by a new capability that uses satellite images to map the speed of flowing ice in Greenland, Antarctica and mountain ranges around the world. With imagery and data from Landsat 8, a joint mission of NASA and the U.S. Geological Survey, scientists are providing a near-real-time view of every large glacier and ice sheet on Earth. The NASA-funded Global Land Ice Velocity Extraction project.....[More]
  1395/10/18
   Scientists reconstruct formation of the southern Appalachians
  NGDIR News Section-- Around 300 million years ago, the landmass that is now North America collided with Gondwana, a supercontinent comprised of present-day Africa and South America. That clash of continents lifted tons of rock high above the surrounding terrain to form the southern end of the Appalachian Mountains now seen in Alabama, Tennessee and Georgia. A team of geophysicists has reconstructed the terminal phase of that collision and developed a new picture of how it unfolded. The study,.....[More]
  1395/10/15
   Study finds more extreme storms ahead for California
  NGDIR News Section-- New technique predicts frequency of heavy precipitation with global warming. On Dec. 11, 2014, a freight train of a storm steamed through much of California, deluging the San Francisco Bay Area with three inches of rain in just one hour. The storm was fueled by what meteorologists refer to as the "Pineapple Express"- an atmospheric river of moisture that is whipped up over the Pacific's tropical waters and swept north with the jet stream. By evening, record rainfall ha.....[More]
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