11 October 2016, Climate News Network, Climate impacts double US forest fires. New study finds that man-made global warming is the root cause of a relentless increase in forest fires in the US. Climate change has already doubled the number of forest fires in the western US since the 1980s − and it is a trend that will continue to increase, according to new research. The study says the rise in temperatures and aridity sucks the moisture out of the plants, trees, dead vegetation on the ground and the soil, and is part of a worldwide trend of ever-increasing wildfires. Scientists from Columbia University’s Lamont-Doherty Earth Observatory pin the blame firmly on human-induced climate change − a significant statement in a country where many Republican supporters still refuse to accept that the burning of fossil fuels is causing global warming. There has been a lively debate about the issue, and the scientists make clear in research published in the journal Proceedings of the National Academy of Science that they wanted the settle the argument. Bigger fire years “No matter how hard we try, the fires are going to keep getting bigger, and the reason is really clear,” says the study’s co-author Park Williams, a bioclimatologist at the Earth Observatory. “Climate is really running the show in terms of what burns. We should be getting ready for bigger fire years than those familiar to previous generations.” Forest fires in the US west began increasing in the 1980s − as measured by area burned, the number of large fires, and length of the fire season. The increases have continued, and, while there are a number of contributing factors, the study concludes that at least 55% of the increase is due to man-made climate change. “A lot of people are throwing around the words climate change and fire − specifically, fire chiefs and the governor of California last year started calling this the ‘new normal’,” says the study’s lead author, John Abatzoglou, associate professor of geography at the University of Idaho. “We wanted to put some numbers on it.” Read More here
Category Archives: Impacts Observed & Projected
11 October 2016, The Conversation, Hurricane Matthew is just the latest unnatural disaster to strike Haiti. At least 1,000 people were killed when Hurricane Matthew battered the Tiburon peninsula in Haiti last week, destroying houses and displacing tens of thousands.A humanitarian crisis is now unfolding for the survivors, with the Pan American Health Organization warning of a likely cholera surge in the country due to severely damaged water supply and sanitation systems. Several other Caribbean island states have been affected, including the Dominican Republic, Jamaica, Barbados, Saint Vincent and the Grenadines, and Cuba, as well as the United States. In 2011, one of us (Jason) led a team to Haiti’s capital Port-au-Prince to contribute to the reconstruction effort after the devastating 2010 earthquake. The team worked particularly on the provision of housing. In all interactions, the team encountered a local community that was honourable, industrious and kind. This perception is confirmed by those who have spent time on the ground after Hurricane Matthew. But, as is common in the media and institutional narrative following disasters, prejudices and preconceptions abound. Following the earthquake, the Haitians were portrayed as weak, dependent, corrupt and lawless victims. The international community intervened, amid a global outpouring of grief, support and solidarity. Five years later, destruction and suffering in Haiti is again making headlines. Why is history repeating itself? Read More here
29 September 2016, The Conversation, Record high to record low: what on earth is happening to Antarctica’s sea ice? 2016 continues to be a momentous year for Australia’s climate, on track to be the new hottest year on record. To our south, Antarctica has also just broken a new climate record, with record low winter sea ice. After a peak of 18.5 million square kilometres in late August, sea ice began retreating about a month ahead of schedule and has been setting daily low records through most of September. It may not seem unusual in a warming world to hear that Antarctica’s sea ice – the ice that forms each winter as the surface layer of the ocean freezes – is reducing. But this year’s record low comes hot on the heels of record high sea ice just two years ago. Overall, Antarctica’s sea ice has been growing, not shrinking. So how should we interpret this apparent backflip? In our paper published today in Nature Climate Change we review the latest science on Antarctica’s climate, and why it seems so confusing. Antarctic surprises. First up, Antarctic climate records are seriously short. The International Geophysical Year in 1957/58 marked the start of many sustained scientific efforts in Antarctica, including regular weather readings at research bases. These bases are mostly found on the more accessible parts of Antarctica’s coast, and so the network – while incredibly valuable – leaves vast areas of the continent and surrounding oceans without any data. In the end, it took the arrival of satellite monitoring in the 1979 to deliver surface climate information covering all of Antarctica and the Southern Ocean. What scientists have observed since has been surprising. Read More here
29 September 2016, Climate News Network, Speed of Arctic changes defies scientists.The Arctic climate is changing so quickly that science can barely keep track of what is happening and predict the global consequences, the UN says. In an unusually stark warning a leading international scientific body says the Arctic climate is changing so fast that researchers are struggling to keep up. The changes happening there, it says, are affecting the weather worldwide. The World Meteorological Organisation (WMO) says: “Dramatic and unprecedented warming in the Arctic is driving sea level rise, affecting weather patterns around the world and may trigger even more changes in the climate system. “The rate of change is challenging the current scientific capacity to monitor and predict what is becoming a journey into uncharted territory.” The WMO is the United Nations’ main agency responsible for weather, climate and water. Its president, David Grimes, said: “The Arctic is a principal, global driver of the climate system and is undergoing an unprecedented rate of change with consequences far beyond its boundaries. Read More here