Evidence for solar forcing of climate variation from delta O-18 of peat cellulose

There have been a number of investigations for examining the possible link between long-term climate variability and solar activity, A continuous delt a(18)O record of peat cellulose covering the past 6 000 years and the respo nse of climate variation inferred from the proxy record to solar forcing ar e reported. Results show that during the past 5 000 years the abrupt climat e variations, including 17 warming and 17 cooling, and a serious of periodi cities, such as 86, 101, 110, 127, 132, 140, 155, 207, 245, 311, 820 and 1 050 years, are strikingly correlative to the changes of solar irradiation a nd periodicity. These observations are considered as further evidence for a close relationship between solar activity and climate variations on time s cales of decades to centuries.