Sunday, April 10, 2011

Yamal and Hide-the-Decline

Yamal and Hide-the-Decline « Climate Audit: "The effect of using “all the data to hand” is potentially quite dramatic. The graphic below compares the Briffa 2009 chronology (red) to the average of site RCS chronologies for the 20 Vaganov sites in the 10-degree box. As you can see, there is considerable correlation between the two chronologies, though the Briffa version is spikier than the much larger Vaganov network. The discrepancy becomes very pronounced from the 1970s on – the Vagnov network shows the characteristic “decline” in the late 20th century that also characterized the large Schweingruber network, while the Briffa Limited Hangout network surges to new records."