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Sea Level Change

Sea Level Change. By: Amanda Bura & Amy Cross. What is Sea Level Change?. The rise and fall of the sea level due to multiple complex factors such as plate tectonics, glaciers, thermal expansion and global warming. It is difficult to measure Has been derived mainly from tide-gauge data.

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Sea Level Change

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  1. Sea Level Change By: Amanda Bura & Amy Cross

  2. What is Sea Level Change? • The rise and fall of the sea level due to multiple complex factors such as plate tectonics, glaciers, thermal expansion and global warming. • It is difficult to measure • Has been derived mainly from tide-gauge data

  3. Why Does It Occur? • Concurrent rise in global temperature over past 100 years. • Thermal expansions of oceans accounts for about 2-7 centimeters of the sea level rise. • Retreat of glaciers and ice caps accounts for about 2-5 centimeters

  4. Sea level rise due to certain trends in the environment

  5. Measurements suggest that sea level has risen worldwide 15-20 cm. in the last century. • Along the U.S. coast sea level has been rising 2.5-3 mm. a year.

  6. Unusual Rise in Sea Levels • Bangladesh is experiencing high and unusual changes of sea levels due to subsided river delts.

  7. Effects of Sea Level Change • On small time scales continents can be joined or separated by changes in sea level. • Relatively small changes in sea level can have a major effect on the geography of a continent.

  8. Effects for the Future • Sea level could rise 40 to 65 cm by the year 2100, due to predicted  greenhouse-gas-induced climate warming. • It is important to study records of how sea level has been changing.

  9. Climatologist Kevin Trenberth notes that while predictions for sea level have changed over the years, rising seas remain "a major problem on long-time scales.... Even if you stabilize temperature and greenhouse gases, sea level will continue to rise."

  10. References • http://www.csr.utexas.edu/gmsl/main.html • http://www.discoverourearth.org/student/sea_level/index.html • http://www.grida.no/climate/vital/19.htm • http://www.usna.edu/NAOE/courses/en420/bonnette/Sea_level_rise_and_tides.html • http://yosemite.epa.gov/oar/globalwarming.nsf/content/ClimateTrendsSeaLevel.html

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