Search Results for: hurst

Steig 2009’s Non-Correction for Serial Correlation

In a story featured on the cover of Nature, Eric J. Steig, David P. Schneider, Scott D. Rutherford, Michael E. Mann, Josefino C. Comiso and Drew T. Shindell report to have found “significant warming” that “extends well beyond the Antarctic Peninsula to cover most of West Antarctica, an area of warming much larger than previously […]

More Phil Jones Correspondence

CA reader Geoff Sherrington, an Australian scientist, sends the following email exchange with Phil Jones in early 2006 (original post here). Geoff observes: there is a reluctance to answer direct questions with direct answers and a lot of red herrings thrown in. Readers can deduce what they like from the exchange, where Phil says he […]

A Letter to Ritson

Ritson at realclimate did not thank me for helpful discussions on autocorrelation despite lengthy correspondence on my part with him. I thought that the histogram that I posted up earlier today looked familiar. So I looked back at my correspondence with Ritson (who posted up on autocorrelation at realclimate and sure enough, I’d sent the […]

Demetris Koutsoyannis

I mentioned a few days ago that a serious discussion had threatened to break out at realclimate, where Demetris Koutsoyannis had posted up some astute commentary. He has recently dropped in here as well. I was unfamiliar with his work prior to this recent introduction. He has written extensively on climate, much of which has […]

More on realclimate on Cohn and Lins

Let’s look again at what Rasmus was saying before Gavin sent him to the end of the bench. He argued that Cohn and Lins were sucking and blowing by calibrating the autocorrelation on instrumental records, which themselves contained a trend. Gavin endorsed this position. On the face of it, this seems like a plausible criticism. […]

Cohn and Lins [GRL 2005]

Cohn and Lins [GRL 2005] , engagingly titled “Nature’s Style: Naturally Trendy”, questions whether recent trends in temperature can be classified as statistically significant, if considered from a more general perspective, including stochastic processes other than white noise. Some of the issues will be familiar to readers of this blog, although the treatment in Cohn […]

Weather and Climatology: Mandelbrot's View

Update: also see posts 382, 460, 462, 460. We often hear a distinction made between “climate” and “weather”. It may surprise people that the famous mathematician, Benoit Mandelbrot, thought about this problem with completely opposite conclusions to realclimate. Mandelbrot is a prolific author who invented and popularized the concept of fractals . His popular book, […]