Geography Reference
In-Depth Information
Figure 2.3
Observed changes in (a) global average surface temperature; (b)
global average sea level from tide gauge (black line) and satellite
(white dots) data; and (c) Northern Hemisphere snow cover for
March-April. Smoothed lines represent decadal averaged values
while black circles show yearly values. The vertical lines are the
uncertainty intervals estimated from a comprehensive analysis of
known uncertainties (a and b) and from the time series (c). Source:
Climate Change 2007: The Physical Science Basis
.
