The Slow Fourier Transform (SFT)

Guest Post by Willis Eschenbach While investigating the question of cycles in climate datasets (Part 1, Part 2), I invented a method I called “sinusoidal periodicity”. What I did was to fit a sine wave of various periods to the data, and record the amplitude of the best fit. I figured it had been invented…

Advertisements

Two years to a 1740-type event?

Guest essay by David Archibald Wiggle-matching has been used by the best. Hubert Lamb, considered to be the most meticulous climatologist of all time, used wiggle-matching in this wind data graph he published in 1988: He had plotted up 600 years of wind data at London, noted a 200 year periodicity and copied the line…

Coldest Spring In England Since 1891

By Paul Homewood Originally, it was thought to be the coldest spring since 1962. Winter? Teesdale in County Durham blanketed in snow on May 23 in what is likely to be Britain’s coldest spring since 1962 http://www.dailymail.co.uk/news/article-2333312/UK-weather-Spring-coldest-50-years-average-temperature-just-6C.html According to the Central England Temperature Series, England has just experienced its coldest Spring since 1891. The average…

The curious case of rising CO2 and falling temperatures

Guest essay by Tony Brown Some readers might recall my recent article ‘The Long Slow Thaw?’ In this I reconstructed Central England temperature to 1538 from its current instrumental date of 1659. I was surprised by two notable periods of warmth around 1630 and 1530. I am indebted amongst other material, to Phil Jones excellent…

Temperature change in perspective

Guest post by Ed Hoskins The UK Met Office long term Central England Temperature record[1] has kept a continuous and consistent data set since the 1660s. It appears to be reliable and to have maintained its quality. It has not been adjusted as have so many other official temperature records.Although the CET record covers only…

The Message in the Dye 3 Data

Guest post by David Archibald The story so far: in this recent post – Ap Index Neutrons and Climate, we had looked at the Dye 3 oxygen isotope-derived temperature record to see how big climate swings have been over the last few thousand years. Figure 1: Dye 3 Temperature Record from Oxygen Isotope Ratios As…

A short anthology of changing climate

Guest post by Tony Brown Context is everything, and nowhere more so than in climate history, where a graphic such as this seems to illustrate an alarming uptick in temperatures that has been blamed on modern man and his profligate burning of CO2; Table 1 http://data.giss.nasa.gov/gistemp/graphs/ But take one step back; Table 2 http://www.berkeleyearth.org/analysis.php And…