Climatic Data - Climate Change: Identification and Projections - page 22

The first graph, from Delaygue and Bard [DEL 10] starts in 695, while
the second is from Usoskin et al . [USO 08]. They both correct the raw data
taken from ice caps in order to take various factors into account, such as the
conditions of atmospheric transfer, the deposit process, or terrestrial
geomagnetism. The units are different, but this is irrelevant since the proxies
will be converted into TSI units ( Wm -2 ).

Partial reconstruction

The three types of indicators of solar activity stated above are too
strongly correlated for an identification algorithm to be able to assess
precisely what can attributed to one or another in global temperature
variations. Inversely, they are not close enough to allow us to splice them
together without difficulty.

Figure 2.9 shows four reconstructions spanning four centuries, (period
1610-2013), splicing sun spots (Figure 2.7) with modern measurements
(Figure 2.6).

1362.5

1362

1361.5

1361

1360.5

1360

1359.5

timv13
timv15
lean1 (with ER background)
lean0 ( without ER backgro u nd)

1359

1358.5

1600 1650 1700 1750 1800 1850 1900 1950 2000

Figure 2.9. Reconstructions over four centuries (1610-2013)