The Rise in Sea Level

Credit: www.climatecentral.org/

The impact that climate change has on the rise in sea level could be much greater than previously anticipated. According to German researchers, there are two factors that come to play in the rise - melting ice and the thermal expansion of water as it warms. Sea level expansion, now believed to be 1.4mm per year, is ever increasing as the years go by. This expansion has been greatly underestimated in the past, but now researchers are realizing just how much "heat-related expansion of the water mass in the oceans contributes to a global rise in sea level." The increase is not this cut and dry however, it can vary greatly from place to place. For example, the Philippines is said to be “rising at five times the global rate.”

The increased level of expansion is not unexpected. The rise in sea level is caused by global warming, and the average temperature has risen almost two degrees since the 1800s. Even with the global variation, climate change is the ultimate cause for increases everywhere. The harmful effects of global warming are so great that scientists have stated that if it was not a factor, sea levels may have actually fallen during the 20^th century. Climate change has been reported as the cause for three fourths of coastal flooding in the U.S. over the past ten years. Sea level increase is starting to be a big topic of conversation. “There’s a definite recognition among people who weren’t talking about sea level rise 5 years ago that it’s something to be concerned about,” said Laura Tam, a policy director at SPUR, which is an urban planning think-tank based in San Francisco. “And something that needs to be planned for.”

For more information: Climatecentral.org, Theguardian.com