Subtropical waters are reaching Greenland's glaciers and likely triggering an acceleration of ice loss, reports a team of researchers from the Woods Hole Oceanographic Institution (WHOI) and the University of Maine.
"This is the first time we've seen waters this warm in any of the fjords in Greenland," says Fiamma Straneo, a physical oceanographer from the WHOI. "The subtropical waters are flowing through the fjord very quickly, so they can transport heat and drive melting at the end of the glacier."
While melting due to warming air temperatures is a known event, scientists are just beginning to learn more about the ocean's impact — in particular, the influence of currents — on the ice sheet.
"Among the mechanisms that we suspected might be triggering this acceleration are recent changes in ocean circulation in the North Atlantic, which are delivering larger amounts of subtropical waters to the high latitudes," says Straneo. But a lack of observations and measurements from Greenland's glaciers prior to the acceleration made it difficult to confirm.
The research team conducted two extensive surveys during July and September of 2008, collecting both ship-based and moored oceanographic data from Sermilik Fjord — a large glacial fjord in East Greenland.
Sermilik Fjord, which is 100 kilometers (approximately 62 miles) long, connects Helheim Glacier with the Irminger Sea. In 2003 alone, Helheim Glacier retreated several kilometers and almost doubled its flow speed.
Deep inside the Sermilik Fjord, researchers found subtropical water as warm as 39 degrees Fahrenheit (4 degrees Celsius). The team also reconstructed seasonal temperatures on the shelf using data collected by 19 hooded seals tagged with satellite-linked temperature depth-recorders. The data revealed that the shelf waters warm from July to December, and that subtropical waters are present on the shelf year round.
"This is the first extensive survey of one of these fjords that shows us how these warm waters circulate and how vigorous the circulation is," says Straneo. "Changes in the large-scale ocean circulation of the North Atlantic are propagating to the glaciers very quickly — not in a matter of years, but a matter of months. It's a very rapid communication."
The study highlights how little is known about ocean-glacier interactions, which is a connection not currently included in climate models. "We need more continuous observations to fully understand how they work, and to be able to better predict sea-level rise in the future," says Straneo.
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Part I: Bee Deaths Mystery Solved? Neonicotinoids (Neonics) May Actually Help Bee Health
- Smoking, Drinking And Eating: It's Not About Your Freedom
- Chronic Pain Isn't All In The Brain
- Part II: Bee Deaths And CCD - Flawed Chensheng Lu Harvard Studies Endanger Bees
- Violence, Sex And Taboo: The Original Brothers Grimm Fairy Tales Back In Print
- Like Collaboration And Intelligence In Humans? Thank War
- Diversity Fatigue: Why Businesses Struggle To Close The Gender Gap
- "There is no question they were created to cater to universities and are staffed by people from..."
- "And my second link should be not a copy of the first, but this: http://www.nature.com/news/half..."
- "Recently I saw The Conversation remove/censor legitimate comments arguing against an article written..."
- tags because there's no testing..." href="/robert_inventor/why_we_cant_backup_earth_on_mars_the_moon_or_anywhere_else_in_our_solar_system-148364#comment-182183">"Robert, you might want to reformat my post. I intended to highlight only the headlines for easy..."
- "My only complaint with good thinkers and writers has hither always been that they should produce..."
- Behavioral interventions to prevent progression to diabetes equally effective in men and women
- Gender differences in adaptation to space flight
- Long-term complication rate low in nose job using patient's own rib cartilage
- Survival differences seen for advanced-stage laryngeal cancer
- Effect of once-daily, low-dose aspirin on heart attack deaths and other outcomes
Books By Writers Here