by J. Li, J. Dodson et al., March 1,  2017 in QuaternSciReviews

We suggest that solar activity may play a key role in driving the climatic fluctuations in North China during the last 22 centuries, with its quasi ∼100, 50, 23, or 22-year periodicity clearly identified in our climatic reconstructions.

We quantitatively illustrate that precipitation (67.4%) may have been more important than temperature (32.5%)…