I have found a much faster way to display spherical grids based on IDL object graphics. This uses OGL hardware support. I chose the warmest month ever recorded (March 2016) to show results. First here is the grid rotated about the ‘y-axis’ which shows coverage from pole to pole. The intense gridding visible are the US stations in GHCNV3 and to a lesser extent also in Europe. Australia and Africa are also clearly visible.
The next animation shows the temperature anomalies calculated on the same grid, as described in the last post. I have to use the original aspect ratio this time otherwise the animated gif washes out the blue colour. Yes it is still abnormally cold in Antarctica.
The temperature scale for anomalies is ± 10C (blue to red). For comparison here is one of the coldest months in the last decade : January 2008. There was exceptional cold conditions over Siberia and the global average was about the same as the normalisation period 1961-1990.
Animations are all a bit of a gimmick, but I just can’t resist them. However I will try to make some better quantitative visualisation for a given month.