Extreme Weather Linked to Giant Waves in Atmosphere

Discussion in 'Politics' started by futurecurrents, Feb 26, 2013.

  1. This new study may have a bearing on future commodity prices, insurance risk etc.

    The Northern Hemisphere has taken a beating from extreme weather in recent years — the 2003 European heat wave, the 2010 Pakistan flood and the 2011 heat wave in the United States, for example. These events, in a general sense, are the result of the global movement of air.
    Giant waves of air in the atmosphere normally even out the climate, by bringing warm air north from the tropics and cold air south from the Arctic. But a new study suggests these colossal waves have gotten stuck in place during extreme weather events.
    "What we found is that during several recent extreme weather events these planetary waves almost freeze in their tracks for weeks," lead author Vladimir Petoukhov, of the Potsdam Institute for Climate Impact Research (PIK) in Germany, said in a statement. "So instead of bringing in cool air after having brought warm air in before, the heat just stays."
    How long these weather extremes last is critical, the researchers say. While two or three days of 86 degrees Fahrenheit (30 degrees Celsius) pose little threat, 20 days or more can lead to extreme heat stress, which can trigger deaths, forest fires and lost harvests.

    The researchers created equations to model the motion of the massive air waves, determining what it takes to make the waves plough to a stop and build up. The team then used these models to crunch daily weather data from the U.S. National Centers for Environmental Prediction.
    During extreme weather events, the waves were indeed trapped and amplified, the scientists found. They also saw a significant increase in the occurrence of these trapped waves.
    Here's how the waves may be getting trapped: The burning of fossil fuels causes more warming in the Arctic than in other latitudes, because the loss of snow and ice means heat gets absorbed by the darker ground, not reflected (as it would by the white snow). This warming lessens the temperature difference between the Arctic and northern latitudes like Europe. Since these differences drive air flow, a smaller difference means less air movement. Also, land areas warm and cool more easily than oceans. The result is an unnatural pattern of air flow that prevents the air waves from circulating over land.
    The study's results help explain the spike in summer weather extremes. Previous research had shown a link between climate change and extreme weather, but did not identify the mechanism.
    "This is quite a breakthrough, even though things are not at all simple — the suggested physical process increases the probability of weather extremes, but additional factors certainly play a role as well, including natural variability," study co-author Hans Joachim Schellnhuber, also of PIK, said in a statement.

  2. pspr


    <a href=http://notrickszone.com/2012/06/29/meteorologist-dr-wolfgang-thune-calls-potsdam-institutes-science-pure-voodoo-magic-for-spreading-fear-among-the-public/>Meteorologist Dr. Wolfgang Thüne Calls Potsdam Institute’s Science “Pure Voodoo Magic For Spreading Fear Among The Public”</a>
  3. Lucrum


    So now we need a wave tax I guess.
  4. pspr


    You're always ridiing these waves in the sky to save fuel aren't you? :D
  5. Taxes are the wave of the future..
  6. That's like me pointing at the mathematical proof a theoretical physicist has written on the blackboard and saying it's wrong. The fact that I say it's wrong has zero credibility.
  7. pspr


    You can certainly say that again. And again. And again.
  8. Ricter


    Good, we need a military.
  9. jem


    for instance on the east cost its called the bermuda high..

    it spins off the south eastern us in the summer... sometimes it gets large and stays that way... sometimes is does not.

    they are acting like they are discovering what any outdoor person learns by watching the weather map for years.

    In san diego we have jet stream that is effected by a high that builds in over us --- and that seems to be effected by el nino and la nina.

    some years our high just sits here and pushes the jet stream north and bad weather south...

    even when it breaks down for a few days it likes to come back.
    in good weather years the high is very persistent.

    the last few years it has not been that persistent.