Every PenguinTracker dispatch tagged method. 6 posts.
We asked all 5,686 fitted measurements on this site which year they changed level. One answer cost us a published number, and it is now corrected in public.
You do not count penguins from orbit, you count their guano. Here is how the method works, and the measurements that show our own version of it failing.
Antarctica has 729 known penguin breeding sites. Measured against sea ice they are 56 independent places, and the species with the most sites have fewest.
Our sea ice metric reproduced five published emperor penguin breeding failures and completely missed a sixth. The miss is the more useful result.
The sensor that flew before 1988 reads several points low near coasts. Correct for it and 34 emperor colony sea ice trends fall to 10. Here is the proof.
Web Mercator clips at 85 degrees and the South Pole is undefined in it. Here is why every web map fails on Antarctica, and the projection that works.