New study says impacts expected to show up in 20-30 years
Ocean researchers tracking currents in the North Atlantic say that, so far, the massive amounts of freshwater, pouring off the melting Greenland Ice Sheet haven’t yet had a major effect on the Gulf Stream.
Pole to pole and across the world’s oceans and mountains, climate change impacts are adding up
By Bob Berwyn
For any Summit Voice readers not following my Twitter or Facebook feeds, here’s a list of links to my recent stories for InsideClimate News.
Of greatest interest here in the West is a new University of Utah study that projects a dramatic upward shift of the snowline in the Rockies and coastal ranges in California, Oregon and Washington. Less spring snowpack at lower elevations has huge effects on we manage our water, and could also result in more early season wildfires: Unabated Global Warming Threatens West’s Snowpack, Water Supply.
‘Blocking highs’ becoming more common over Greenland
Just a few weeks after scientists reported record early melting on parts of the Greenland Ice Sheet, a new study helps explain some of the recent dramatic climate shifts in the high latitudes of the northern hemisphere.
Stationary high pressure systems over Greenland have become more frequent since the 1980s, said University of Sheffield geographer Prof. Edward Hanna, adding that the pattern is also linked with extreme weather over northwest Europe, including unusually wet conditions in the UK in the summers of 2007 and 2012.
Scientists are tracking yet another global warming feedback mechanism that will have dire consequences for coastal communities around the world. Melting sea ice and overall rapid warming in the Arctic are factors in the development of so-called blocking high pressure systems — air masses spinning clockwise that block cold, dry Canadian air from reaching Greenland.
The highs tend to enhance the flow of warm, moist air over Greenland, contributing to increased extreme heat events and surface ice melting, according to the study. That circulation pattern leads to more melting of the Greenland Ice Sheet, according to new research published online in the Journal of Climate last month, co-authored by Jennifer Francis, one of the pioneers in studying how global warming is affecting the jet stream. Continue reading “Climate: Jet stream shifts may speed Greenland meltdown”→
‘If human activities are starting to impact this system, it is a worrying sign that the scale of human impacts on the climate system may be reaching a critical point’
Cold, fresh water from the Greenland Ice Sheet may disrupt a key ocean current in the North Atlantic, scientists said after updating estimates of the freshwater flux based on new satellite data. The study, published in the journal Nature Communications, warns that the changes could have as-yet uncertain implications for the global climate.
Eastern Greenland changes could threaten critical ocean current
By Bob Berwyn
The global climate agreement reached late last year in Paris isn’t going to stop the Greenland Ice Sheet from melting anytime soon. Even with an immediate halt to greenhouse gas emissions. there may be centuries more melting ahead, according to climate scientists.
Study shows that 2012 melting created a dense ice cap
When warm temperatures in 2012 caused an extreme melting episode across much of the Greenland Ice Sheet, it may have fundamentally altered the way the near-surface snow layers absorb water, according to a new study published in Nature Climate Change.