The following figure shows the AMO+PDO (black line above changed to red below) superimposed on the Arctic average annual temperature shown at the beginning of this document.
Note: I tried to provide an excerpt for readers of this website Appinsys in the post there about Arctic cycles, but gave up. The website is written in MS-Word HTML export which is quite frankly the worst possible way to publish a website. The amount of garbage code it creates that makes it impractical for sharing and pretty much ruins the effectiveness of the website for others that want to reference it with excerpts. Trying to paste even short excerpts into WUWT’s WordPress publisher caused massive visual entropy. So, all I can manage is this sentence and image above.
I hope he’ll take a cue from this and use a real publishing platform (WordPress, Blogger, Typepad, anything but MS-Word) designed for the web so we can help spread the word more often. Good works shouldn’t be saddled by bad web publishing systems.
Here’s the link – http://www.appinsys.com/GlobalWarming/ArcticCycles.htm
UPDATE: Well, maybe not so good after all. Bob Tisdale writes in comments:
The AMO+PDO graph strikes again. It is a prime example of the adage “correlation does not mean causation”, because the AMO+PDO graph is meaningless. You can’t add the AMO and the PDO. I’ll cut and paste a comment I made on an earlier thread here at WUWT to save myself some time.
Unfortunately, the PDO and AMO are not similar datasets and cannot be added or averaged. The AMO is created by detrending North Atlantic SST anomalies, while the PDO is the product of a principal component analysis North Pacific SST anomalies, north of 20N. Basically, the PDO represents the pattern of the North Pacific SST anomalies that are similar to those created by El Niño and La Niña events. If one were to detrend the SST anomalies of the North Pacific, north of 20N, and compare it to the PDO, the two curves (smoothed with a 121-month filter) appear to be inversely related:
Thanks Bob for teaching us all something. Not being an ocean data specialist, I wasn’t aware in the difference in datasets. Hopefully this exposure of this issue here will prompt wider understanding that while they seem similar, you can’t appropriately combine the two datasets – Anthony