{"id":27411,"date":"2017-01-25T16:08:33","date_gmt":"2017-01-25T20:08:33","guid":{"rendered":"http:\/\/www.fondriest.com\/news\/?p=27411"},"modified":"2017-01-25T16:08:33","modified_gmt":"2017-01-25T20:08:33","slug":"researchers-track-glacial-meltwater-surprising-journey","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/researchers-track-glacial-meltwater-surprising-journey.htm","title":{"rendered":"Researchers Track Glacial Meltwater On Its Surprising Journey"},"content":{"rendered":"

While the scientific community has formed its consensus on how ice sheets are shrinking in and around Greenland, some researchers are tracking what happens to the meltwater as it drains into the ocean each summer. <\/p>\n

Their study, published in Nature Geoscience<\/a> by an interdisciplinary team of biologists, oceanographers and hydrologists, used computer models to simulate the meltwater to see where currents take it and what effect it could have on the ocean.<\/p>\n

Renato Castelao, one of the researchers and an associate professor of marine science for the University of Georgia, said one of the biggest discoveries of the study was the surprising final destinations of the ice sheets as they melt into the ocean each summer. <\/p>\n

He said the meltwater from the southeast end of the country flows west under its southern tip ending up in the Labrador Sea, between Greenland and Canada. However, water from southwest Greenland tends to head north into the Baffin Bay.<\/p>\n

Another critical finding, he said, was that different glaciers are comprised of hugely variable compositions of phosphorus, nitrogen and other plant stimulants. Because meltwater is lighter than the salty ocean water, it can spread broadly, altering the productivity of the parts of the ocean it reaches. <\/p>\n

\u201cOne of the key things that we found on this study is that water from different regions will have different effects,\u201d he said. \u201cIn particular, the most striking result is that the water introduced from southwest Greenland has very different effects than water introduced from southeast Greenland.\u201d<\/p>\n

Hence, shrinking ice sheets in different ends of the country can alter the productivity of distant ocean areas. <\/p>\n

\"glacial

Researchers from Rutgers University and the University of Georgia’s Thomas Mote track meltwater from glacial fjords during summer 2013. (Credit: Asa Rennermalm \/ Rutgers University)<\/p><\/div>\n

This matters, he said, because earlier research in the field has focused on water chemistry from the southwest end of the country alone, which tends to be easier to access. However, it\u2019s the meltwater from the southeast end of the country that covers a greater area of the ocean, and has a different nutrient composition than meltwater from the southwest. <\/p>\n

\u201cWe found that that area [southeast Greenland] is really key to influencing the Labrador Sea,\u201d he said. \u201cSo one of the things that we hope will come up with this study is recognition from the scientific community that we need to focus more on Southeast Greenland if we want to understand the effect of this area in the Labrador Sea.\u201d<\/p>\n

The researchers tracked the meltwater using a computer model they built with data from known ocean currents, satellites, ships and buoys, similar to how meteorologists forecast weather. <\/p>\n

After verifying the model\u2019s results against the researchers\u2019 own observations, Castelao said they added a dye to the simulated meltwater as it entered the ocean, and tracked its progress as it flowed. <\/p>\n

With findings in hand, Castelao said the next step for the scientists is to figure out how to use their models as a predictive resource when ice melts. <\/p>\n

\u201cWe saw there\u2019s this big difference in the fate of water from one region to another,\u201d he said. \u201cWhat we\u2019re trying to understand now is why that is; What are the mechanics that drive these differences? This is what will give us predictive capabilities.\u201d<\/p>\n

He added he would also like to conduct more research into how the different nutrient compositions of the meltwater from different ice sheets affect the biology of the pieces of the ocean they reach. <\/p>\n

Along with Castelao, Hao Luo (UGA), Asa Rennermalm (Rutgers University), Marco Tedesco (Columbia University), Annalisa Bracco (Georgia Institute of Technology), Patricia Yager (UGA) and Thomas Mote (UGA) all authored the research. <\/p>\n

Top image:\u00a0Researchers stationed in Greenland tracked the fate of glacial meltwater as it wormed its way around the island nation to determine effects on productivity.<\/span><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

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