Reconstructed annual reflectance anomalies, Δp*
(black) with respect to
the mean anomaly for the regression calibration period, 1999-2001 (gray
band). The large error bars result from the seasonal variability of the
Earth's albedo, which can be 15-20%. Also plotted (blue) are the
ES-observed annual anomalies for 1999-2003 and 1994-1995. The right-hand
vertical scale shows the deficit in global SW forcing relative
The red solid bar represents the accumulated forcing (in W / m2)
the greenhouse gases concentration increase over the last 100 years, from
the International Panel for Climate Change (2001).
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Image credit: Earthshine Project, BBSO.