The Environmental Evolution Research Since 16000 In Jilin Hani

Hani region is in Jilin province, which is located in the northeastern of China. The HN peat developed in the region is the representative of the northeastern mountainous peat in our country. The area is affected by the East Asian monsoon for a long time. The peat in this region is so continuous and fast in deposition rate that provide significant data to reconstruct the paleoenvironment and paleoclimate. The article is based on investigate the humification degree and the total mercury content in HN peat to extract the information of environmental and climatic change since 16000 years. Then, analyze the climate change characteristics between HN peat and NT peat. In addition, do the sensitivity experiment with the Community Earth System Model in order to get the response characteristics of climate change to UV variation in solar activity in both regions. Final conclusions:(1) HN peat in Jilin province reflect the regional climate change experienced five stages during 16057 a B.P.～1002 a B.P.:16057 a B.P.～11710 a B.P. was cold period in late Pleistocene、11710 a B.P.～10260a B.P. was warm and humid period in the early Holocene、10260 a B.P.～8870 a B.P. was the period of rapid changes in temperature、8870 a B.P.～3650 a B.P. was warm and wet period of Holocene、3650 a B.P.～1002a B.P. was cold and dry period of Holocene. The climate in this region suddenly got colder many times since 16057a B.P., respectively in 13750、12380、 11060、10260、9700、8150、5800、4200、2800、2100、1500、1200 a B.P..(2) Analyze the time series of humification degree and total mercury content about HN peat, we found that there were 3000a、1500a、78a、63a～66a、54a～56a and 48a-39a quasi cycles in it. Among them, most of the cycles can be linked with the cycle of solar activity.(3) The climate simulation results of Hani and Caohai in 50 years showed that the trend of climate change was both rising, but Caohai rose faster than Hani.(4) The change of the UV had a marked impact on the global climate system, but the degree of response to the climate fluctuations caused by UV change differed in each region. Comparing Hani to Caohai, we found that the temperature of Hani region had more sensitive response to UV change. The temperature would rise with increasing UV in Hani region, however, it would get lower temperature in Caohai region.