Solar Science ||

A paper from N. Scafetta and B. West submitted to Geophysical Research Letters:

We study the solar impact on 400 years of a global
surface temperature record since 1600. This period includes
the pre-industrial era (roughly 1600–1800 or 1600–1900),
when negligible amount of anthropogenic-added climate
forcing was present and the sun realistically was the
only climate force affecting climate on a secular scale, and
the industrial era (roughly since 1800–1900), when
anthropogenic-added climate forcing has been present
in some degree. We use a recent secular Northern
Hemisphere temperature reconstruction (Moberg et al.,
2005), three alternative total solar irradiance (TSI) proxy
reconstructions (Lean et al., 1995; Lean, 2000; Wang et al.,
2005) and a scale-by-scale transfer climate sensitivity model
to solar changes (Scafetta and West, 2005, 2006). The
phenomenological approach we propose is an alternative to
the more traditional computer-based climate model approach,
and yields results proven to be almost independent on the
secular TSI proxy reconstruction used. We find good
correspondence between global temperature and solar
induced temperature curves during the pre-industrial period
such as the cooling periods occurring during the Maunder
Minimum (1645–1715) and the Dalton Minimum (1795–
1825). The sun might have contributed approximately 50%
of the observed global warming since 1900 (Scafetta and
West, 2006). We briefly discuss the global cooling that
occurred from the medieval maximum (
1000–1100 AD)
to the 17th century minimum.

So they used the Moberg reconstruction. At least it wasn’t the Hockey Stick.