It will almost certainly continue this way. We dont know if we caused it. Its frustrating to not be able to say anything definitive on that last point, but I really dont think we can. However, Richard Alley, a noted glaciologist at Penn State University, had a different interpretation. He suggested the possibility thatwhat happened in the 1940s may have been the last in a long chain of El Nino and La Nina-linked wobbles back and forth for Pine Island, before more decisive human influences came in and destabilized it for good. ContinueThe data collected probably would not be able to see earlier ungroundings on the upglacier side of the ridge, because later groundings would erase the record, Alley continued. If this model is correct, then the real event that is most important is the main retreat in the 1970s, which is after human forcing had become more important. In terms of the human influence on the Antarctic, I think you have to be very cautious about over-interpreting the results of the paper, thats the bottom line, added Eric Rignot, a polar researcher with NASA and the University of California-Irvine who published a blockbuster study on the destabilization of the Amundsen Sea in 2014. Rignot praised the new observations, but said that recent changes in the Amundsen Sea region are strong and synchronous, and appear to be something different from what may have happened in the 1940s. Pine Island is not the only one, you have Thwaites, you have Smith-Kohler , they all sort of retreat at the same rate, so to blame things on just one little ridge, on one glacier, is probably a little bit risky, he said. The whole picture is theres a common forcing to all of those, and theres no way these glaciers could have retreated and sped up like they did in the last 20 years, and did that for decades, even a century. Even as the new paper seems likely tospark considerabledebate, another just released study of Pine Island raises the stakes even further. Seongsu Jeong of the Ohio State University and colleagues from Ohio State and the University of Michigan suggests that Pine Island has begun a new, different, and troublingform of ice loss in recent years.
For the original version including any supplementary images or video, visit https://www.washingtonpost.com/news/energy-environment/wp/2016/11/23/west-antarctica-is-in-big-trouble-but-now-scientists-say-that-may-date-back-to-1945/
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