This figure was inspired by Fig. 1a of Jensen et al. 2013: «Spatial analysis of
ice phenology trends across the Laurentian Great Lakes region during a recent warming period.»
Not exact matches
The basic fact of warming is supported by a huge array of complementary data (ocean warming,
ice melting,
phenology etc).
[Response: You fail to see that ocean temperatures, satellite measurements, glacier melting, Arctic
ice retreat, changes in
phenology are all consistent with a warming planet.
Ice and
phenology aren't so useful for detection in that sense because they are qualitative measures and it's hard to extract relative magnitudes or spatial patterns from them.