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Particulate Pollution Shown to Warm Atmosphere As It Cools Earth's Surface

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  • Tim Jones
    From: Climate Crisis Coalition Newsfeed Thursday, August 2, 2007 Particulate Pollution Shown to Warm Atmosphere As It
    Message 1 of 1 , Aug 2, 2007
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      From:
      Climate Crisis Coalition Newsfeed
      <http://www.climatecrisiscoalition.org/>
      Thursday, August 2, 2007

      Particulate Pollution Shown to Warm Atmosphere As It Cools Earth's Surface.
      <http://news.bbc.co.uk/1/hi/sci/tech/6926597.stm>
      BBC News, August 1, 2007.
      "Clouds of pollution over the Indian Ocean appear to cause as much
      warming as greenhouse gases released by human activity, a study has
      suggested. U.S. researchers used unmanned aircraft to measure the
      effects of the 'brown clouds' on the surrounding area. Writing in
      Nature [Magazine], they said the tiny particles increased the solar
      heating of the lower atmosphere by about 50%. The warming could be
      enough to explain the retreat of glaciers in the Himalayas, the
      scientists proposed. The clouds contain a mixture of light absorbing
      aerosols and light scattering aerosols, which cause the atmosphere to
      warm and the surface of the Earth to cool. The main sources of the
      pollutants came from wood burning and fossil fuels, the team added.
      Aerosols, also known as particulates, cool the land or sea below
      because they filter out light from the Sun. While this process, known
      as 'global dimming', is fairly well understood, the effect aerosols
      have on the surrounding atmosphere is still unclear."


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