Instrumental records do not go back far enough to provide us with reliable measurements of global climaticvariability on timescales longer than a century.
仪器上记录的年代不够久远,因而无法可靠地提供一个世纪以前全球气候变化的测量值。
2
The climatic models simulated by proxy indices reflecting solar activity point out that solar variability can interpret most of temperature change before 1850.
Zhou Liantong, Huang Ronghui. 2006. Characteristics of interdecadal variability of spring precipitation in North China and its possible cause [J]. Climatic Environ Res, 11 (4) : 441-450.