Sorry for the delay, I haven’t actually been lazy at all. I have been working on a couple of what I find very interesting posts this one today and possibly another tomorrow. You aren’t going to believe this…
Those who have followed the Steig reconstruction know that 3 curves were used with different weightings to recreate the entire antarctic. The 3 curves look like this.
Linear combinations of these 3 curves make the temperature trend for the entire antarctic. RegEM was used to create the data prior to 1982 for the satellites by basically copying surface station data onto the ends of the sat data. RegEM is supposed to follow the data that exists so the PC’s should look the same in the pre 1982 period as the post. But they don’t! The paper makes the statement that 3 pc’s are used in RegEM however in the result PC3 is near zero and therefore there are really only 2. In this post I made a video of the Steig temperature anomalies for the antarctic. None of the data in this video is real, ALL of it is highly processed. The data post 1982 is derrived from PCA analysis of real data. The pre 1982 data is pasted on ‘imputed’ data.