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Originally posted by sd211212
2012 has started out very strange.
TextCauses of Global Climate Change Climate change is controlled primarily by cyclical eccentricities in Earth's rotation and orbit, as well as variations in the sun's energy output. "Greenhouse gases" in Earth's atmosphere also influence Earth's temperature, but in a much smaller way. Human additions to total greenhouse gases play a still smaller role, contributing about 0.2% - 0.3% to Earth's greenhouse effect. Major Causes of Global Temperature Shifts (1) Astronomical Causes 11 year and 206 year cycles: Cycles of solar variability ( sunspot activity ) 21,000 year cycle: Earth's combined tilt and elliptical orbit around the Sun ( precession of the equinoxes ) 41,000 year cycle: Cycle of the +/- 1.5° wobble in Earth's orbit ( tilt ) 100,000 year cycle: Variations in the shape of Earth's elliptical orbit ( cycle of eccentricity ) (2) Atmospheric Causes Heat retention: Due to atmospheric gases, mostly gaseous water vapor (not droplets), also carbon dioxide, methane, and a few other miscellaneous gases-- the "greenhouse effect" Solar reflectivity: Due to white clouds, volcanic dust, polar ice caps (3) Tectonic Causes Landmass distribution: Shifting continents (continental drift) causing changes in circulatory patterns of ocean currents. It seems that whenever there is a large land mass at one of the Earth's poles, either the north pole or south pole, there are ice ages. Undersea ridge activity: "Sea floor spreading" (associated with continental drift) causing variations in ocean displacement.
TextAs mentioned above, the 2011-2012 winter season will come in with a bang and could absolutely be brutal from the Northern Plains to the Northeast and extending as far south as the southeastern United States. The extreme cold that could make its presence known in eastern portions of the United States will not be an indication of what will occur for the entire winter as some of these same regions could see a major thaw by mid to late January. Even Florida could see several nights of freezing temperatures in the early winter season weeks, but overall, most of Florida will end up mild. So just because your region may be put in a milder region does not mean that you will not experience brutally cold temperatures and snowy conditions at some point in this winter season.
TextThe link with La Nina, which occurs every three to five years is that it is thought to create low pressure fronts thousands of miles away by its impact on upper air currents. Even the Met office has said that we could be facing a mini ice-age like the one which struck Britain and Northern Europe 300 years ago. These extreme cold winter weather conditions have the potential to bring the country to a halt and cause fatalities, which is why councils across the country are stockpiling thousands of tonnes of salt and grit. A salt and grit reserve stockpile of 2 million tonnes is held by the Department for Transport with 500 gritters and 20 snow blowing trucks at the standby. There are many schools of scientific thought on the reason behind the specific climate change mechanism driving the colder winters we have suffered for the past 3 years, but solar activity combined with man made global warning are the two main agreed propagators of these events. It all depends which scientist you talk to and on what day….. Read more: www.economicvoice.com...
Originally posted by Segador
This has been the warmest winter I can remember.
I kind of wish there was a small Ice Age.
TextThe team used the Community Climate System Model, which was developed by scientists at NCAR and the Department of Energy with colleagues at other organizations, to test the effects of volcanic cooling on Arctic sea ice extent and mass. The model, which simulated various sea ice conditions from about 1150 to 1700 A.D., showed several large, closely spaced eruptions could have cooled the Northern Hemisphere enough to trigger the expansion of Arctic sea ice. The model showed that sustained cooling from volcanoes would have sent some of the expanding Arctic sea ice down along the eastern coast of Greenland until it eventually melted in the North Atlantic. Since sea ice contains almost no salt, when it melted the surface water became less dense, preventing it from mixing with deeper North Atlantic water. This weakened heat transport back to the Arctic and created a self-sustaining feedback on the sea ice long after the effects of the volcanic aerosols subsided, according to the simulations. The researchers set solar radiation at a constant level in the climate models. The simulations indicated that the Little Ice Age likely would have occurred without decreased summer solar radiation at the time, Miller says.