Northern Hemisphere f11, f13
Posted by Jeff Id on April 2, 2012
I have quietly been spending some more hours of free time on sea ice and have a ton of data to present. Previously, we found that there was a nearly statistically significant difference in trend between satellite NOAA 17 and 13 that would create a spurious trend increase. In addition, we found a fairly strong offset in the data which would tend to go in the opposite direction. Post here.
Now I’ve got a quick comparison of NOAA11 and 13 sea ice instruments which have an overlap only 6 months long. In this dataset, the trend is in the opposite direction. Below is a plot of the various satellites in the Arctic.
The plot below shows the overlap region of f13-f11 satellites.
The next graph shows a large nearly statistically significant POSITIVE trend between the NOAA13 sat and the previous #11.
Recall that there was a nearly statistically significant negative trend in the NOAA 13-17 transition.
The only things to conclude from this is that the overlap regions of satellite data don’t have a trend bias in the same direction and there is not enough match between the satellite changes to reliably be within a two-sigma trend. Still, that is more solid than what I have seen around the Internet.