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The oceans have heaved up and down as world temperatures have waxed and waned, but as new research tracking the past 2,800 years shows, never during that time did the seas rise as sharply or as suddenly as has been the case during the last century.
The new study, the culmination of a decade of work by three teams of farflung scientists, has charted what they called an “acceleration” in sea level rise that’s triggering and worsening flooding in coastlines around the world.
The findings also warn of much worse to come.
The scientists reported in a paper published Monday in Proceedings of the National Academy of Sciences that they have greater than 95 percent certainty that at least half of more than 5 inches of sea level rise they detected during the 20th century was directly caused by global warming.
“During the past millennia, sea level has never risen nearly as fast as during the last century,” said Stefan Rahmstorf, a physics professor at Potsdam University in Germany, one of 10 authors of the paper. “That was to be expected, since global warming inevitably leads to rising seas.”
“The new sea level data confirm once again just how unusual the age of modern global warming, due to our greenhouse gas emissions, is,” Rahmstorf said. “They also demonstrate that one of the most dangerous impacts of global warming, namely rising seas, is well underway.”
Were it not for the effects of global warming, the researchers concluded that sea levels might actually have fallen during the 20th century. At the very least, they would have risen far less than was actually the case.
or is my source bad?
imply rate of change.
never during that time did the seas rise as sharply or as suddenly as has been the case during the last century
originally posted by: network dude
a reply to: Krazysh0t
but your information is DRASTICALLY different then mine. Why is that? I thought we were both looking at sea level rise for the planet Earth right?
Look at my chart. The rise looks very steady. Then look at yours. It almost looks as if it happens overnight. Now one of us is dishonest here. Would you agree?
originally posted by: gspat
originally posted by: Krazysh0t
or even existed longer than 2800 years ago
That part does it...
Nothing to strawman.
Get simple basic well acknowledged facts right first.
originally posted by: gmoneystunt
a reply to: Krazysh0t
Looks debatable. Less than four months ago there was this thread on ATS
Sea level rise is no longer a threat, Antarctica and Greenland GAINING ice.
Basically it is saying that if Antarctica isn't contributing to the sea rise, then something else is. Climate change.
“The good news is that Antarctica is not currently contributing to sea level rise, but is taking 0.23 millimeters per year away,” Zwally said. “But this is also bad news. If the 0.27 millimeters per year of sea level rise attributed to Antarctica in the IPCC report is not really coming from Antarctica, there must be some other contribution to sea level rise that is not accounted for.”
The water level measured at a tide gauge is affected by a number of oceanographic and meteorological phenomena, including the astronomical tide, changes in atmospheric pressure, wind, river discharge, ocean circulation, changes in water density, and added water volume due to the melting of ice. The astronomical tide is caused by the gravitational effects of the moon and the sun, creating very long waves in the ocean, which propagate over the continental shelf and into shallow bays, where amplifications and nonlinear distortions take place. Increased atmospheric pressure decreases water level and vice versa. In shallow areas the onshore-offshore wind component can directly push water toward the shore (wind setup) or away from it (setdown). The usually more dominant effect is caused further offshore by the longshore wind component, which can raise or lower the water level because the Coriolis force causes transport to the right of the wind direction. Along certain coasts wind also causes upwelling, which affects the temperature and density of the water column. Steric sea level changes, that is, water level changes due to density changes, are caused by temperature changes in the water column and the resulting thermal expansion or contraction. Changes in ocean circulation, especially at the western boundaries of oceans, affect sea level through changes in density and through geostrophic adjustments (i.e., through maintenance of a balance between Coriolis and the cross-stream pressure gradient). River discharge can raise water level at a station in the river due to a frictional effect, or to a lesser extent at nearby stations by the addition of less dense fresh water. Some of the river runoff may have been in the form of snow or ice for months of each year or for several years. Additional freshwater volume (that has been in the form of ice for centuries) can be added by the melting of glaciers or the ice sheets on Greenland and Antarctica. All of these phenomena produce signals much larger than the estimated 1 to 2 mm/yr sea level rise signal, and thus complicate the task of calculating such a trend.