HOW GLOBAL WARMING HAS AFFECTED GLACIERS By: Tunyasiri & Kankanit P.3

HOW WOULD TEMPERATURES HAVE BEEN CHANGING IN THE PAST CENTURY? Global surface temperatures have risen by almost a degree in the past century. Sea levels have risen, while snow and ice cover has dropped significantly. Coral reefs are being destroyed and weather patterns are becoming wilder and less predictable. The major cause of this is now clear. It is because of human. Who are burning ever increasing amounts of fossil fuel and have raised carbon dioxide levels in the atmosphere by 40% in the past 250 years.

 more than half a trillion tonnes of carbon – from coal, oil and gas – have now been burned in factories, cars and homes and dumped in the atmosphere since the Industrial Revolution. HOW WOULD TEMPERATURES HAVE BEEN CHANGING IN THE PAST CENTURY?

 In the past, these climate change deniers have insisted that variations in the sun's energy or fluctuations in cosmic rays could be behind the global warming that has been observed in recent decades.  But experts reject this claim. In fact, satellite measurements of the solar radiation entering the atmosphere, compared with the radiation being reflected back into space, show there has been no change in the rate of Earth's warming. Most researchers believe that changes in sea currents may be taking heat deep into oceans. HOW WOULD TEMPERATURES HAVE BEEN CHANGING IN THE PAST CENTURY?

 "The heat is still coming in, but it appears to have gone into the deep ocean and, frustratingly, we do not have the instruments to measure there," said Professor Ted Shepherd of Reading University. "Global warming has certainly not gone away." HOW WOULD TEMPERATURES HAVE BEEN CHANGING IN THE PAST CENTURY?

 The sea level would begin to rises  But now the sea level begin to drops every century  "One recent study found a way to assess sea ice cover in the Arctic over the past 1,600 years. At no point in that time were levels found to be as low as they are today. The current drop is probably the handiwork of human beings."

 Glaciers melt when the amount of ice turning back into water is larger than the amount of ice being formed. Since glaciers occur on rivers, water moves underneath them.  As more of the ice melts, there is more water moving and this is called a positive feedback because the increased motion causes yet more ice to melt. The ice then melt from below. HOW THIS CHANGE HAS AFFECT THE GRACIER?

 Global warming drives this by increasing the amount of radiation in the atmosphere.  When light comes from the sun it is reflected from the earth's surface, then some of this is reflected back again by greenhouse gasses.

HOW THIS CHANGE HAS AFFECT THE GRACIER?  Radiation is what causes the ice particles to melt, and the effect of this radiation on the climate on the region is what will mean the difference between a glacier melting or persisting since it may influence rainfall, snowfall and cloud cover; which all have effects on ice formation and melting.

SOURCE  al.htm  ep/21/climate-change-ipcc-fossil-temperature