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How much has Vegetation Seasonality Diminished?

Vegetation seasonality of the Northern lands has diminished in the past 30 years by an amount equivalent to a 6 to 7 degree southward shift in latitude.

What does this mean?

Let us take the Arctic as an example. Arctic vegetation seasonality during the early-1980s (1982 to 1986) corresponded to the seasonality of vegetation north of 64N. By the late-2000s (2006 to 2010), Arctic vegetation seasonality corresponded to the early-1980s seasonality of vegetation north of 57N - a diminishment in Arctic vegetation seasonality equivalent to a 7 degree southward shift in latitude during this 30-year period.

The figure to the left illustrates this graphically, using Banks and Victoria Islands of Canada, as an example.

Note that vegetation seasonality is opposite of plant growth. A decrease in vegetation seasonality means an increase in plant growth - figure below to the right.


Larger version of this figure

Larger version of this figure
Climate and Vegetation Research Group
Dept. of Geography,Boston University. XXX-XX-2013