|
|||||
|
|
| 云南鹤庆盆地近1Ma来的气候序列重建初探 | |
| 引用本文： | 童国榜,刘志明,王苏民,羊向东,王书兵.云南鹤庆盆地近1Ma来的气候序列重建初探[J].第四纪研究,2002,22(4):332-339. |
| 作者姓名： | 童国榜 刘志明 王苏民 羊向东 王书兵 |
| 作者单位： | 1. 中国地质科学院水文地质环境地质研究所,正定,050803;中国科学院南京地理与湖泊研究所湖泊沉积与环境开放研究实验室,南京,210008 2. 中国地质科学院水文地质环境地质研究所,正定,050803 3. 中国科学院南京地理与湖泊研究所湖泊沉积与环境开放研究实验室,南京,210008 4. 中国地质科学院地质力学研究所,北京,100081 |
| 基金项目： | 中国科学院创新工程项目 (批准号 :KZCX1 -1 0 -0 1 )和中国科学院南京地理与湖泊研究所湖泊沉积与环境开放研究实验室共同资助 |
| 摘 要： | 云南鹤庆盆地近1Ma来的孢粉植物群很好地揭示了本区的环境演化过程。本文利用植物生态位知识,通过模糊数学方法对鹤庆(QH)孔孢粉序列所记录的古气候信息进行重塑,建立了近1Ma来的年均温、年降水量及年较差序列,并将本区气候演化分为4个气候旋回,32个气候期。该序列可与黄土-古土壤序列及海洋δ18O阶段对比,但冷暖波动的幅度及降温时段持续的长短有其特色,表明本区气候既受全球气候变化的控制,又受青藏高原阶段隆升的制约;近1Ma来气温的波动幅度呈递增趋势,0.30MaB.P.尤其显著;冷、暖段间年均温的变化幅度由第一气候旋回的7℃增大到第三气候旋回的9℃(按4次平滑值计算),而样点的实际最大差值由8℃增至16℃;最强烈的降温发生在第二气候旋回中的0.45～0.14MaB.P.时间段,这与玉龙雪山冰川活动规模最大相一致;降温时年降水量及年较差值增大,证实近1Ma来,西南季风区的气候组构与东南季风区不同。 |
| 关 键 词： | 鹤庆盆地 第四纪 古气候序列重建 气候旋回 |
| 收稿时间： | 2001-11-19 |
| 修稿时间： | 2001年11月19 |
RECONSTRUCTION OF CLIMATIC SEQUENCE OF THE PAST 1Ma IN THE HEQING BASIN, YUNNAN PROVINCE |
|
| Institution: | 1. Institute of Hydrogeology and Environment Geology, Chinese Academy of Geological Science, Zhengding 050803; 2. Open Laboratory of Lake sediment and environment, Chinese Academy of Sciences, Nanjing 210008; 3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081 |
| Abstract: | Pollen floras from the Heqing basin well reveal the environmental evolution of the past 1Ma in this area. Palaeoclimatic information recorded in the pollen sequence from the Heqing hole (QH) was analyzed by using the method of fuzzy mathematics coupled with the conception of shrine in phytoecology, and a climatic sequence (involving January mean temperature, July mean temperature, annual mean temperature and annual precipitation) was established. This sequence includes 4 climatic cycles and 32 climatic stages. It can be correlated with the loess palaeosol based sequence and those oceanic δ18 O based stages, but it is different both in the range of temperature change and in the duration of temperature dropping. This suggests that climate in this area has been controlled not only by global climate changes but also by the uplift of the Qinghai Xizang Plateau. There has been an increasing trend in the range of temperature change during the past 1Ma, especially in the last 0.30Ma. The change range in the annual mean temperature varied from 7℃ in the climatic cycle 1 to 9℃ in the cycle 3, but the actual maximum differences measured in the selected samples for the two cycles increased from 8℃ to 16℃. The sharpest temperature drop happened at 0.45～0.14Ma B.P. of the climate cycle 2, which is consistent with the time when the glacial activity of the Yulong Mountain reached its peak. The fact that the annual precipitation and its difference are higher during the period of temperature dropping proves that the climatic structure of the southwest monsoon area has been different from that of the southeast monsoon area in the past 1Ma. |
| Keywords: | Heqing basin Quaternary reconstruction of palaeoclimatic sequence climatic cycles |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |
| 点击此处可从《第四纪研究》浏览原始摘要信息 | |
| 点击此处可从《第四纪研究》下载免费的PDF全文 | |