吉林哈尼地区16000年来的环境演变研究

发布时间：2018-10-30 11:13

【摘要】：哈尼地区位于中国东北部的吉林省,该地区发育的哈尼泥炭则是我国东北山地泥炭的代表,该区域长期受到东亚季风的影响。本区泥炭连续性好,沉积速率较快,为反演哈尼地区的古环境和古气候提供了有力的条件。本文通过对哈尼泥炭中腐殖化度和总汞含量的测试分析,提取出区域16000年来的环境气候变化信息,结合前人对草海泥炭的研究,对比分析了两地的气候的变化特征。最后,利用地球系统模式(CESM)进行敏感性实验,获得两地气候对太阳活动中紫外辐射变化的响应特征。最终,得到以下结论：(1) 16057 a B.P.～1002 a B.P.的吉林哈尼泥炭所反映的区域气候变化大致经过了5个阶段：16057 a B.P.～11710 a B.P.更新世末期的寒冷期、11710 a B.P.～10260a B.P.全新世初期的温暖湿润期、10260 a B.P.～8870 a B.P.温度剧烈变动期、8870 a B.P.～3650 a B.P.全新世温暖湿润期、3650 a B.P.～1002a B.P.全新世后期的干冷时期。该地区16057a B.P.以来发生过多次气候突变降温现象,分别在13750、12380、11060、10260、9700、8150、5800、4200、2800、2100、1500、1200 a B.P.。(2)通过对哈尼泥炭腐殖化度和总汞含量的时间序列分析,发现其有3000a、1500a、78a、63a-66a、54a-56a、48a-39a的准周期。其中,多数周期都能和太阳活动的周期联系起来。(3)本文中对哈尼与草海50年的气候模拟结果表明,哈尼地区与草海地区的气温变化趋势是上升的,但是两地的气温上升速度不一,且草海地区气温上升的速度相对较快。(4)紫外线的变化对于全球气候系统的影响是显著的,但是各地区对于紫外线变化而引起的气候波动的响应程度不一,对比哈尼和草海两地,发现哈尼地区的气温对于紫外线变化的响应更加敏感,增加的紫外线对于哈尼地区有着升温作用,而对于草海地区则有着相反的降温作用。
[Abstract]:The Hani region is located in Jilin province in northeast China. The Hani peat developed in this area is the representative of peat in the northeast of China. The area is affected by the East Asian monsoon for a long time. The peat in this area has good continuity and rapid deposition rate, which provides a powerful condition for inversion of paleoenvironment and paleoclimate in Hani area. In this paper, the humification degree and the total mercury content in the Hani peat were measured and analyzed, and the environmental climate change information of 16, 000 years in the region was extracted. Combined with the previous studies on the peat in the grass sea, the climate change characteristics of the two places were compared and analyzed. Finally, the sensitivity experiments using the Earth system model (CESM) are carried out to obtain the response characteristics of the climate of the two places to the changes of ultraviolet radiation in solar activity. Finally, the following conclusions are obtained: (1) 16057 a B.P.~1002 a B.P. The regional climate change reflected by Jilin Hani peat experienced about five stages: 16057 a B.P.~11710 a B.P. The cold period of late Pleistocene, 11710 a B.P.~10260a B.P. The warm and humid period of the early Holocene, 10260 a B.P.~8870 a B.P. 8870 a B.P.~3650 a B.P. Holocene warm and humid period, 3650 a B.P.~1002a B.P. The dry and cold period of the late Holocene. In this area, 16057a B.P. There have been many climatic abrupt cooling phenomena since 13750 / 123801 1060 / 10260 / 970 / 8150 / 500 / 4200 / 2800N / 2100 / 1500 / 1200 a B.P. (2) by time series analysis of the humification degree and total mercury content of Hani peat, it was found that there were 3 000 a (1 000) a ~ (1) a ~ (15) a ~ (78) a ~ (63) a ~ (66) a ~ (54) a ~ 56a ~ (a) ~ (56) a of Hani peat. The quasi period of 48a-39a. Most of the cycles can be related to the solar cycle. (3) the climate simulation results of Hani and Caohai over the past 50 years show that the temperature variation trend in Hani and Caohai areas is increasing. However, the rate of temperature rise in the two places is different, and the temperature in the Caohai area is rising relatively fast. (4) the changes of ultraviolet rays have a significant impact on the global climate system. However, the degree of response of different regions to the climatic fluctuations caused by the changes of ultraviolet radiation varies. Comparing with Hani and Caohai, it is found that the temperature in Hani region is more sensitive to the changes of ultraviolet light. The increased ultraviolet rays have a warming effect on the Hani area and the opposite effect on the Caohai area.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P532

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