Research News from 2004

10 news release for this year.

  • October 07, 2004
    drought_animation.jpg

    Researchers from the Lamont-Doherty Earth Observatory of The Earth Institute at Columbia University have used 835 annual tree-ring chronologies based on measurements from 20- to 30-thousand tree samples across the United States, Mexico, and parts of Canada to reconstruct a history of drought over the last 2005 years. The resulting drought reconstructions have been organized into a North American Drought Atlas CD-ROM, the first of its kind, which maps year-by-year occurrences of droughts.

  • October 07, 2004
    cracked_earth.jpg

    Severe drought in western states in recent years may be linked to climate warming trends, according to new research, led by scientists from the Lamont-Doherty Earth Observatory of The Earth Institute at Columbia University, to be published in the journal Science. This research was supported by the National Oceanic and Atmospheric Administration (NOAA) and the National Science Foundation (NSF).

  • July 07, 2004
    vostok_bedrock_300.jpg

    Deep in the Antarctic interior, buried under thousands of meters (more than two miles) of ice, lies Lake Vostok, the world's largest subglacial lake. Scientists believe that the waters of Lake Vostok have not been disturbed for hundreds of thousands of years, and there are tantalizing clues that microbes, isolated for at least as long, may exist.

  • June 18, 2004
    2003-10-11103Acover2.jpg

    What causes the peaks and valleys of the world’s great mountains? For continental ranges like the Appalachians or the Northwest’s Cascades, the geological picture is clearer. Continents crash or volcanoes erupt, then glaciers erode away. Yet scientists are still puzzling out what makes the highs high and the lows low for the planet’s largest mountain chain, the 55,000-mile-long Mid-Ocean Ridge.

  • June 11, 2004
    BajaBathymetry.jpg

    For years, researchers have examined climate records indicating that millennial-scale climate cycles have linked the high latitudes of the Northern hemisphere and the subtropics of the North Pacific Ocean. What forces this linkage, however, has been a topic of considerable debate. Did the connection originate in the North Pacific with the sinking of oxygen-rich waters into the interior of the ocean during cool climate intervals, or did it originate in the subtropical Pacific with the transfer of heat between the ocean and the atmosphere?

  • May 26, 2004

    Two centuries since the start of the Industrial Revolution, the human population has increased six-fold, and economic activity an estimated fifty-fold. The sheer number of people on the planet and the intensity of economic activity are having profound effects on the long-term global climate, threatening to disrupt vast biological, geochemical, and social systems in future decades. This is fact.

     

     

  • May 14, 2004
    ussurfaceradiation.jpg

    From 1960 to 1990, scientists have observed a 1.3% per decade decline in the amount of sun reaching the Earth’s surface. This phenomenon, coined “solar dimming,” is due to changes in clouds and air pollution that are impeding the sun's ability to penetrate. Scientists believe that the combination of growing quantities of man-made aerosol particles in the atmosphere and more moisture have caused the cloud cover to thicken.

  • March 12, 2004
    fig1_400.jpg

    Finding the epicenter of earthquakes has not changed in principle since the 1930s -- after closely examining seismograms from different widely-spaced listening stations, researchers decide on the arrival times of various seismic waves and calculate an approximation. In practice this can result in errors of several miles

  • February 05, 2004
    hudson_375.jpg

    The Hudson River Estuary, a stretch of the Hudson River from Troy, N.Y. to its mouth in New York Harbor, has begun a new stage of its life say geologists at Columbia University's Lamont-Doherty Earth Observatory and Queens College in Flushing, N.Y. Researchers at both institutions have found that, aside from a few very specific locations, the estuary may have largely stopped filling in with new sediment.

  • January 05, 2004
    subway.jpg

    Columbia University researchers have found that steel dust generated in the New York City subway significantly increases the total amount of airborne iron (Fe), manganese (Mn) and chromium (Cr) that riders breathe. The airborne levels of these metals associated with fine particulate matter in the subway environment were observed to be more than 100 times greater than levels observed in home indoor or outdoor settings in New York City.

Syndicate content