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2018-08-20. Ecosystems Are Getting Greener in the Arctic.

posted Aug 29, 2018, 4:04 PM by Alan Gould
By Theresa Duque, Berkeley Lab. [http://newscenter.lbl.gov/2018/08/20/ecosystems-are-getting-greener-in-the-arctic/] For GSS Ecosystem Change chapter 4, Climate Change chapters 7 & 8. Excerpt: In recent decades, scientists have noted a surge in Arctic plant growth as a symptom of climate change. But without observations showing exactly when and where vegetation has bloomed as the world’s coldest areas warm, it’s difficult to predict how vegetation will respond to future warming. Now, researchers at the U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) and UC Berkeley have ...In a study published online Aug. 20 in Nature Climate Change, the researchers used satellite images taken over the past 30 years to track – down to a pixel representing approximately 25 square miles – the ebb and flow of plant growth in cold areas of the northern hemisphere, such as Alaska, the Arctic region of Canada, and the Tibetan Plateau. ...At first, the satellite data showed what they expected – that as Arctic climates warmed, tree and plant growth increased. After comparing these observations with state-of-the-art climate models developed for CMIP5 – the Coupled Model Intercomparison Project Phase 5 ...Their data analysis revealed that 16 percent of Earth’s vegetated land where plant growth was limited by cold temperatures three decades ago is no longer predominantly temperature-limited today, a result that was not reproduced by the CMIP5 models tested. “Our findings suggest that CMIP5’s predictions may have significantly underestimated changes in the Arctic ecosystem, and climate models will need to be improved to better understand and predict the future of the Arctic,” said first author Trevor Keenan....