Sea level has increased more in the last 100 years than in the previous 6,000
The sea level rise over the last century has no comparison with any period of the last 6,000 years, having risen about 20 centimeters, reveals a study published in the scientific journal "Proceddings of the National Academy of Sciences".The research analyzed the sea fluctuations over the past 35 thousand years based on changes in the volume of ice on Earth. The main conclusion is the historical record, unusual, of the last 100 years, with the rise of 20 inches since the early 20th century. For the same period, scientists have identified a rising temperatures, which caused the melting of the ice caps and ocean thermal expansion, as the main cause of the rise in global sea level.To study the fluctuations of the sea in the last 35 thousand years were collected over a thousand samples of sediments in the United Kingdom, North America, Seychelles and Greenland. He was chosen a period of 35 thousand years once comprising a interglaciar period. The ice formed during this period began to melt for 16,000 years and complete defrosting finished only 8,000 years. However, the slowdown in sea level changes did not occur before the last 6,000 thousand years, writes the Guardian.During the past six millennia, the sea level was fairly stable, to start increasing in the modern age. According to Kurt Lambeck, Australian National University, which carried out the study, during these six millennia not found evidence of 30 centimeters to 25 swings in periods of 100 years, but that trend changed from the industrialization process. "In the last 150 years have witnessed an increase in the level of the water at a speed of several millimeters per year and our oldest records didn't find a similar behavior," said the investigator, linking the phenomenon to global warming.Foto: Stefan Schinning / Creative Commons
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