Melting Glaciers Causing 25 to 30% of Sea Level Rise
Glaciers may be melting faster than scientists thought, causing 25 to 30 percent of global sea level rise, according to comprehensive research published in Nature on Monday.
While previous studies had only assessed 500 glaciers, the new study looked at more than 19,000 glaciers using both satellite data and field visits, lead study author and University of Zurich glaciologist Michael Zemp told CNN. The researchers found that, between 1961 and 2016, the world's non-polar glaciers had lost around 9,000 billion tons of ice and contributed 27 millimeters to rising ocean levels. That's enough ice to turn the U.S. into an ice-rink four feet thick.
Melting ice sheets in #Greenland and the #Antarctic as well as ice melt from #glaciers all over the world are causi… https://t.co/Q7flTHC6lN— University of Zurich (@University of Zurich)1554735902.0
The new report put the shrinkage rate for glaciers at 18 percent faster than that calculated by another international study in 2013. It found that glaciers are contributing as much ice melt to sea level rise as the Greenland ice sheet and more than the Antarctic ice sheet, National Geographic reported. In the 1960s, when the study period began, glaciers would melt in summer and regain mass in winter. But beginning around the 1980s, they began to lose more in the summer than they regained in winter, and by the 1990s, almost every glacier they studied was losing more than it could recuperate. Only glaciers in southwest Asia are not losing mass because of regional climate factors, the Associated Press reported.
"The drama is that it's increasingly negative," study co-author and University of Zurich geographer Frank Paul told National Geographic.
Today, glaciers lose about 335 billion tons of ice a year, the equivalent of one millimeter per year of sea level rise, according to a University of Zurich release.
"Globally, we lose about three times the ice volume stored in the entirety of the European Alps – every single year!" Zemp said.
Glaciers around the world have lost well over 9 trillion tonnes of ice since 1961, raising sea level by 27 mm. Thes… https://t.co/txb8R2AD8W— ESA EarthObservation (@ESA EarthObservation)1554736720.0
Glaciers in Alaska contributed the most to sea level rise, while glaciers in Patagonia and the rest of the Arctic were also major contributors. Glaciers in the Alps, the Caucasus mountains and New Zealand were also shrinking fast, but were too small to contribute to sea level rise.
Glacier loss isn't just a problem for coastal areas, however. It could also be destructive for the communities that depend on them for drinking water.
"In Peru, they really are like water towers," Paul told National Geographic.
The study found that glaciers in Canada, the U.S., New Zealand and Europe could melt completely by 2100.
"Under current loss rates we are going to lose glaciers — basically all glaciers — in several mountain ranges," Zemp told CNN.
Melting glaciers dramatically alter Canada's Yukon https://t.co/IpjwsGq2eV— The Ice Age (@The Ice Age)1540930387.0
EcoWatch Daily Newsletter
By Loveday Wright and Stuart Braun
After a Japanese-owned oil tanker struck a reef off Mauritius on July 25, a prolonged period of inaction is threatening to become an ecological disaster.
<div id="bb0a7" class="rm-shortcode" data-rm-shortcode-id="e5aefc0fff61ab1aea2f4b03c5399864"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1291765757013983238" data-partner="rebelmouse"><div style="margin:1em 0">The #oilspill is devastating but I want to honour the community mobilisation at the Mahebourg waterfront today (to… https://t.co/UWFkZFdjdi</div> — Fabiola Monty (@Fabiola Monty)<a href="https://twitter.com/LFabiolaMonty/statuses/1291765757013983238">1596815930.0</a></blockquote></div><p>"Booms are made of nylon mesh filled with #sugarcane straws all hand-stitched by Mauritian volunteers, empty plastic bottles used as buoys," described Mauritian journalist Zeenat Hansrod in a tweet. </p>
How to Tackle Oil Spills<p>The method for tackling oil spills depends on several factors, including the type and amount of oil in question, location and weather conditions.</p><p>"Once the oil comes to shore, the more intensive the cleaning technique. You can risk causing further damage," said Nicky Cariglia, an independent consultant at Marittima, who specializes in marine pollution. </p><p>"If you wanted to remove all traces of oil, the techniques available become increasingly aggressive the less oil that remains. In mangroves, you would have the added risk of causing damage by trampling," Cariglia told DW. Highly sensitive mangrove ecosystems line the Mauritius east coast that is threatened by the current spill.</p><p>Because oil normally has a lower density than water, it floats on the surface of the ocean. This means that for clean-up action to be most effective, it should happen very quickly after a spill, before the oil disperses. </p>
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When Europeans first arrived in North America, Atlantic puffins were common on islands in the Gulf of Maine. But hunters killed many of the birds for food or for feathers to adorn ladies' hats. By the 1800s, the population in Maine had plummeted.
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A "major" natural gas explosion killed two people and seriously injured at least seven in Baltimore, Maryland Monday morning.
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By Alex Kirby
The temperature of the Arctic matters to the entire world: it helps to keep the global climate fairly cool. Scientists now say that by 2035 there could be an end to Arctic sea ice.
Melt Ponds Crucial<p>"The prospect of loss of sea ice by 2035 should really be focusing all our minds on achieving a low-carbon world as soon as humanly feasible."</p><p><a href="http://www.reading.ac.uk/search/search-staff-details.aspx?id=10813" target="_blank">Dr. David Schroeder from the University of Reading</a>, UK, who co-led the implementation of the melt pond scheme in the climate model, says, "This shows just how important sea ice processes like melt ponds are in the Arctic, and why it is crucial that they are incorporated into climate models."</p><p>The extent of the areas <a href="https://nsidc.org/cryosphere/seaice/characteristics/formation.html" target="_blank">sea ice</a> covers varies between summer and winter. If more solar energy is absorbed at the surface, and temperatures rise further, a cycle of warming and melting occurs during summer months.</p><p>When the ice forms, the ocean water beneath becomes saltier and denser than the surrounding ocean. Saltier water sinks and moves along the ocean bottom towards the equator, while warm water from mid-depths to the surface travels from the equator towards the poles.</p><p>Scientists refer to this process as the ocean's global "conveyor-belt." Changes to the volume of sea ice can disrupt normal ocean circulation, with consequences for global climate. </p>
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