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Current sea level rise is about 3 mm/year worldwide. According to the US National Oceanic and Atmospheric Administration (NOAA), "this is a significantly larger rate than the sea-level rise averaged over the last several thousand years", and the rate may be increasing. Sea level rises can considerably influence human populations in coastal and island regions and natural environments like marine ecosystems. __TOC__

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  • Current sea level rise
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  • Current sea level rise is about 3 mm/year worldwide. According to the US National Oceanic and Atmospheric Administration (NOAA), "this is a significantly larger rate than the sea-level rise averaged over the last several thousand years", and the rate may be increasing. Sea level rises can considerably influence human populations in coastal and island regions and natural environments like marine ecosystems. __TOC__
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  • right
Caption
  • 1993(xsd:integer)
  • Satellite Measurement of Sea Level.
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  • 250(xsd:integer)
direction
  • vertical
Image
  • Global_Mean_Sea_Level.svg
  • NOAA_sea_level_trend_1993_2010.png
abstract
  • Current sea level rise is about 3 mm/year worldwide. According to the US National Oceanic and Atmospheric Administration (NOAA), "this is a significantly larger rate than the sea-level rise averaged over the last several thousand years", and the rate may be increasing. Sea level rises can considerably influence human populations in coastal and island regions and natural environments like marine ecosystems. Between 1870 and 2004, global average sea levels rose a total of , and per year. From 1950 to 2009, measurements show an average annual rise in sea level of 1.7 ± 0.3 mm per year, with satellite data showing a rise of 3.3 ± 0.4 mm per year from 1993 to 2009, The reason for recent increase is unclear, perhaps owing to decadal variation. It is unclear whether the increased rate reflects an increase in the underlying long-term trend. There are two main mechanisms that contribute to observed sea level rise: (1) thermal expansion: ocean water expands as it warms; and (2) the melting of major stores of land ice like ice sheets and glaciers. Sea level rise is one of several lines of evidence that support the view that the global climate has recently warmed. In 2007, the Intergovernmental Panel on Climate Change (IPCC) stated that it is very likely human-induced (anthropogenic) warming contributed to the sea level rise observed in the latter half of the 20th century. Sea level rise is expected to continue for centuries. In 2013, the Intergovernmental Panel on Climate Change (IPCC) projected that during the 21st century, sea level will rise another 26cm to 82cm in its fifth assessment report. More recent projections assessed by the US National Research Council (2010) suggest possible sea level rise over the 21st century of between . The Third National Climate Assessment (NCA), released May 6th, 2014, projects a sea level rise of 1 to 4 feet by 2100 (30-120 cm). On the timescale of centuries to millennia, the melting of ice sheets could result in even higher sea level rise. Partial deglaciation of the Greenland ice sheet, and possibly the West Antarctic ice sheet, could contribute or more to sea level rise. Work by a team led by Veerabhadran Ramanathan of the Scripps Institution of Oceanography suggests that a quick way to stave off impending sea level rise is to cut emissions of short-lived climate warmers such as methane and soot. __TOC__
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