Spring has come early to large parts of the Northern Hemisphere warming under a blanket of heat-trapping greenhouse gases, so it’s time to say goodbye to winter with some images celebrating icy creeks. These photos are from Colorado, a global warming hotspot, where the average temperature has increased faster than in any other state in recent years, compared to the previous 30-year meteorological period. This year the trend continued across much of the U.S. and other parts of the world that all reported record warmth during February. In mid-February, the thermometer reached 80 degrees at DIA for the first time ever. Heat waves scorched Australia and parts of South America, and parts of western Europe were also record- or near-record warm, including Austria, where the average countrywide temperature was 2.8 degrees Celsius above the long-term average, with a few individual stations setting all-time heat records for the month. You’ll probably still be able to enjoy frozen wintry scenes like this for a few more years, but if greenhouse gas emissions aren’t cut soon, many areas probably won’t see much winter weather by 2050. We need #climateaction now.
The loss of Arctic sea ice may not lead directly to an increase in cold weather extremes in Europe, according to scientists who studied the links between Arctic changes and mid-latitude weather. In the study, scientists with the University of Exeter found that dwindling sea ice does affect the North Atlantic Oscillation (NAO) weather phenomenon, which affects winter weather conditions in Northern Europe, in places such as the UK, Scandinavia and the Baltic states. Continue reading “How will the melting Arctic affect European weather?”→
In the past 20 years, acidified waters have expanded in the Arctic ocean, spreading northward from Alaska’s Chukchi Sea coastline to just below the North Pole. The pool of acidified water is also getting deeper, from 100 to 250 meters, according to a new study in the journal Nature Climate Change.
In a press release, the researchers said it’s the first time they’ve documented such a rapid and large-scale increase in acidification, “at least twice as fast as that observed in the Pacific or Atlantic oceans,” according to University of Delaware professor Wei-Jun Cai.
The changes will impact different types of ocean life, including tiny marine snails known to be susceptible to ocean acidification, said NOAA scientist Richard Feely. Other Arctic species potentially at risk from ocean acidification are fisheries of shrimp and varieties of salmon and crab — all important food sources for indigenous communities. Continue reading “Ocean acidification spreading in the Arctic”→
Some of the biggest waves on record took a toll on beaches
The 2015-16 El Niño may have been a bust as far as precipitation in California, but it still ended up as one of the strongest episodes of the last 145 years, according to U.S. Geological Survey scientists who studied erosion along the West Coast.
They found that, on average, erosion was 76 percent above normal, with most beaches in California eroded beyond historical extremes. If, as some research suggests, El Niños become stronger in a warming climate, then the West Coast, with its 25 million inhabitants, will become increasingly vulnerable to coastal hazards.
The study covered seasonal changes at 29 beaches from Washington to Southern California. They used 3-D maps and aerial lidar imaging, GPS topographic surveys, and direct measurements of sand levels, combined with wave and water level data to measure the changes.
Winter beach erosion or the removal and loss of sand from the beach is a normal seasonal process, but the extent of erosion can be more severe during El Niño events than in other years.
New study shows warmup will boost methane releases
Small ponds could end up having a huge impact on Earth’s climate as they warm up due to heat-trapping greenhouse gas pollution, according to scientists from the University of Exeter and Queen Mary University of London. The researchers experimentally warmed a number small ponds by about 4-5 degrees Celsius over the course of seven years to study the effects of increased temperatures. Continue reading “How do ponds fit into the global warming equation?”→
Even if precipitation stays the same or increases slightly in the next few decades, Colorado River flows are likely to dwindle due to increasing temperatures in the West. The projected warming in the 21st century could reduce flows by half a million acre feet per year, according to a new study to be published in the AGU journal Water Resources Research. Continue reading “How will global warming affect Colorado River flows?”→
Along with recording the third-highest global average January temperature, scientists with the World Meteorological Organization have been tracking the Polar equivalent of heatwaves, as strong Atlantic storms driving temperatures in the Arctic to near freezing, at times 50 degrees Fahrenheit above the seasonal average.