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 by Staff Writers New Haven CT (SPX) Sep 07, 2018
A new study says pink noise may be the key to separating out natural climate variability from climate change that is influenced by human activity. Not familiar with pink noise? It's a random noise in which every octave contains the same amount of energy. Pink noise is found in systems ranging from earthquakes and electronics to biology and stellar luminosity. Compared to the more familiar white noise, pink noise has more low-frequency components. Writing in the journal Physical Review Letters, Yale researcher John Wettlaufer, graduate student Sahil Agarwal, and first author and Yale graduate Woosok Moon of Stockholm University found that pink noise energy signatures on decadal time scales appear in historical climate proxy data both before and after the Industrial Revolution. "A central question in contemporary climate science concerns the relative roles of natural climate variability and anthropogenic forcing - climate change related to human involvement - which interact in a highly nonlinear manner on multiple timescales, many of which transcend a typical human lifetime," said Wettlaufer, the A.M. Bateman Professor of Geophysics, Mathematics and Physics at Yale. "We find that the observed pink noise behavior is intrinsic to Earth's climate dynamics, which suggests a range of possible implications, perhaps the most important of which are 'resonances' in which processes couple and amplify warming," Wettlaufer said.
Bangkok climate conference sounds alarm ahead of UN summit Bangkok (AFP) Sept 4, 2018 Time is running out to save the Paris Agreement, UN climate experts warned Tuesday at a key Bangkok meeting, as rich nations were accused of shirking their responsibility for environmental damage. The six-day UN conference opened with an urgent plea from delegates to finalise a "rule book" governing the Paris Agreement, the most ambitious global pact yet, to address the impacts of climate change. The rule book will have guidelines for the treaty's 197 signatories on how to provide support to dev ... read more
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