摘要
青藏高原是全球变化的敏感区,重建高原全新世气温序列不仅能认识过去气候变化的特征,而且对评估目前的全球变暖及预测未来气候变化趋势都有重要意义。本文选取青藏高原28个样点的化石孢粉记录,496个样点的表土孢粉数据,采用现代类比法获得各样点的全新世气温序列,并采用单样本区域订正的方法,在集成思想的基础上重建了青藏高原全新世百年分辨率气温集成序列。结果表明:全新世青藏高原气温可以划分为3个阶段,全新世早期(11.5~8.4 ka B.P.)为波动升温期,气温在波动中上升,期间分别在10.9、9.9、9.2 ka B.P.和8.9 ka B.P.可以识别出寒冷事件。全新世中期(8.4~4.4 ka B.P.)为全新世大暖期,气温整体上高于现代,其中,大暖期的鼎盛期出现在8.0~6.1 ka B.P.,气温最高的百年高出现代2.62℃左右。全新世大暖期中的寒冷事件主要发生在8.2、6.1、4.8 ka B.P.左右。4.4 ka B.P.以来为晚全新世,虽然气温总体的波动幅度较大,但总体趋势与现代气温比较接近。将重建的集成序列与其他学者重建的序列相比较,气温的总体趋势基本一致,全新世发生的主要冷暖事件在时间上也基本一致。
As an important factor affecting the natural environment,climate plays a leading role in the evolution of the natural geographical environment. The Tibetan Plateau is the sensitive area of global climate change. Reconstructing plateau Holocene temperature series not only can recognize the characteristics of the past climate change,but also can evaluate the current global warming trend and predict future climate change.This article selects Plateau 28 locations' fossil sporopollen records and 496 locations' surface soil sporopollen data. We obtain the Holocene temperature series using modern analogy of every point,rebuild Centennial Resolution Holocene temperature integrated series using a single sample area correction method and basing on the integrated idea. The results showed that: Plateau temperature during Holocene can be divided into three phases,the early Holocene( 11. 5- 8. 4 ka B. P.) is the fluctuant warming period,that is to say the temperature rises respectively with fluctuations,and the cold events can be identified during 10. 9,9. 9,9. 2ka B. P. and 8. 9 ka B. P. in this period; The Mid-Holocene( 8. 4- 4. 4 ka B. P.) is the Holocene great warm period,the temperature is higher than the modern in general,megathermal Peak period in 8. 0- 6. 1 ka B. P.,the highest temperature higher than modern 2. 62 ℃ or so,and cold events of the great warm period mainly happened in 8. 2,6. 1,4. 8 ka B. P. or so; The third phase is the late Holocene since 4. 4 ka B. P.,the overall trend is relatively close to the present temperature though the overall temperature fluctuation is also large.Compared with other scholars' reconstructed series,the temperature overall trend basically unanimous; the mainly warm and cold events occurred during the Holocene are basically in corresponding period.
出处
《干旱区研究》
CSCD
北大核心
2015年第4期716-725,共10页
Arid Zone Research
基金
国家自然科学基金(41161018
41361047)
青海省自然科学基金(2013-Z-914)
关键词
全新世
气温序列
重建方法
青藏高原
Holocene
temperature series
reconstruction methods
Qinghai-Tibet Plateau
