5 September 2016, CSIRO ECOS, Wired woodlands signal stress as climate dries. In 2015, the normal ‘breathing’ pattern of the Great Western Woodlands in south-western Australia became erratic. In response to lack of rain, the old-growth woodland started to ‘breathe in’ oxygen and ‘breathe out’ carbon dioxide – the opposite of what occurs in normal plant photosynthesis, and a sign the trees were ailing. Lift your eyes above the orange- and gold-hued gimlets and salmon gums that characterise these woodlands and you can see the key to understanding this reversal of nature; a 36m tower equipped with highly sensitive instrumentation.It’s the technology in that tower that has been tracking the trees’ struggle for survival; collecting data on the activity of the woodland by the second and updating daily CSIRO researchers based in Perth. The tower, run by CSIRO researchers Dr Suzanne Prober and Dr Craig Macfarlane, is a part of Australia’sTerrestrial Ecosystem Research Network (TERN) OzFlux Facility. A series of 24 OzFlux towers and 10 associated Supersites have been established as sentinels of change across the country. Toward the TERN goal of creating a national ecosystem observatory, each monitors changes in carbon, water and biodiversity in a nationally significant landscape. Read More here
Category Archives: Ecosystem Stress
22 August 2016, The Conversation, New modelling on bushfires shows how they really burn through an area. Bushfires in Australia can have a devastating impact on an environment and destroy homes and lives, so any effort to prevent them is a welcome move. But the way that we have traditionally understood bushfires and forest flammability in Australia is not up to the challenges of our changing climate. Thankfully, a new approach is making sense of the confusion by looking at the plants themselves. Unfortunately though, time is running out. Years ago I could stand on a ridge in the mountains as winter gales roared through the Alpine Ash forests on the slopes below me. There’d be black cockatoos on the wind and the first hard snow flakes rattling on my coat. It was a wildness that stung the eyes with raw beauty. Sadly those forests are dying. They are being burnt so often that they may be gone by the end of the century. Like the tallest hardwoods in the world and the thousand year old King Billy pines of Tasmania, they are places we have no room for in our fossil fuel economy. It’s not that fire is bad; our forests need it. But it’s coming so hard and fast in this changing climate. We fight the fires and we manage the fuels as best we can, but our best efforts are only as good as the science they are built on, and there are some hard questions to be asked about that science. Read More here
19 August 2016, Washington Post, ‘Climate change is water change’ — why the Colorado River system is headed for major trouble. There’s good news and bad news for the drought-stricken Colorado River system, according to projections just released in a new federal report from the Bureau of Reclamation, manager of dams, power plants and canals. The report predicts that Lake Mead — the river system’s largest reservoir, supplying water to millions of people in Nevada, Arizona, California and Mexico — will narrowly escape a shortage declaration next year. But a shortage is looking imminent in 2018, and water experts are growing ever more worried about the river system’s future. The Colorado River basin has been plagued with drought for 15 years now, and the effects are starting to show. Earlier this spring, Lake Mead — which feeds 90 percent of the water supply in Las Vegas, alone — dropped to its lowest levels since the Hoover Dam was completed in 1936. In fact, the last time the lake was at full capacity, with water levels 1,225 feet above sea level, was in 1983. Since then, and particularly since the year 2000, its surface levels have been steadily dropping, leaving behind a striking white “bathtub ring” around the shoreline showing how the water levels have decreased over the years. Currently, demand on Lake Mead has been removing more water than is being replenished, resulting in a deficit of about 1.2 million acre-feet, or about 400 billion gallons, each year. According to federal guidelines, a shortage is to be declared at the start of any given year if Lake Mead’s water levels have sunk below 1,075 feet above sea level. The new federal projections, spanning the next 24 months, suggest that the elevation will be hovering just below 1,079 feet at the end of this December. Read More here
1 August 2016, Climate Home, UN asked Australia to cover up Great Barrier Reef lobbying. The UN asked the Australian government to cover up details of lobbying that lead to all mention of Australia being scrubbed from a major report on climate threats to world heritage sites. A draft of the UNESCO report, containing details of the threats posed by climate change to the Great Barrier Reef, Kakadu and the Tasmanian wilderness, was sent to Australia’s ambassador to UNESCO George Mina in February. Mina forwarded it to the Environment Department for comment. Several emails were exchanged with UNESCO officials. The report was published in May without any mention of Australian sites. The doctoring was revealed by the Guardian in May, leading to global concern and outrage over the apparent ability for a government to influence the UN body’s scientific reporting. Correspondence between Mina, staff at UNESCO’s World Heritage Centre and the Department of Environment was released to Climate Home after a Freedom of Information (FoI) request. But the documents were almost entirely blacked out at UNESCO’s behest. Deb Callister, an environment department official, told Climate Home that she had consulted with UNESCO about releasing the emails that lead to the removal of the Australian sections. “UNESCO advised that it is their practice not to disclose exchanges of letters or correspondence between the Secretariat and its Member States, and requested that this type of material not be disclosed pursuant to this FOI request,” said Callister. Read More here