“…This region is also one of the most important cradles of Chinese civilization, and various cultures flourished here during the Neolithic Age (Zhang, 2006 and references therein). Because of the important geographical location and cultural status, a lot of palaeoclimate studies were done here, including loess (e.g., An et al, 1991;Liu and Ding, 1998), lake sediment (e.g., Xiao et al, 2004;Peng et al, 2005), stalagmite (e.g., Tan et al, 2003;Zhang et al, 2008), tree ring (e.g., Hughes et al, 1994;Liu et al, 1996), and historical document (e.g., Yan et al, 1993;Tan et al, 2008). However, centennial-to decadal-scale climate variability in north central China during the last two millennia is far from being fully understood.…”