Pollen- and Diatom-Inferred Climatic and Hydrological Changes in Sumxi Co Basin (Western Tibet) since 13,000 yr B.P.
Pollen- and Diatom-Inferred Climatic and Hydrological Changes in Sumxi Co Basin (Western Tibet) since 13,000 yr B.P.
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DOI：
10.1006/qres.1993.1037
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发表时间：
1993-05
影响因子：
2.3
通讯作者：
E. Van Campo;F. Gasse
中科院分区：
文献类型：
--
作者：
E. Van Campo;F. Gasse
在大约公元前13000年盆地首次被填满之后，大约公元前10500年，在欧洲新仙女木期的时间间隔内发生了一次干旱期。一个主要的环境变化发生在约10,000年b.p.，随着湿润条件的建立，随后是一个长期的最大干旱趋势。短期振荡叠加在这一总体气候变化上，约8000年B.P.发生一次大的逆转事件，约7500-6000年B.P.发生第二次湿脉冲，导致最大湖泊容量，最大干旱发生在4300年B.P.。苏溪-龙木Co记录的主要环境波动与热带非洲北部的气候变化相一致，表明8000 - 7000年B.P.的气候变化可能与此有关。事件是由气候系统的突然不平衡引起的，正如新仙女木时期和可能是公元前4300年。事件。
Abstract Although the Tibetan Plateau greatly influences the atmospheric circulation of the Nortbern Hemisphere, few continuous paleoclimatic records are available from the plateau. A 13,000-yr pollen and diatom record from the Sumxi-Longmu Co basin in western Tibet gives information on major changes both in regional vegetation and in local hydrology. After the basin first filled ca. 13,000 yr B.P., a dry spell occurred about 10,500 yr B.P. within the interval spanned by the European Younger Dryas chronozone. A major environmental change occurred suddenly at ≈10,000 yr B.P., with the establishment of wet conditions, and was followed by a long-term trend toward maximum aridity, which lasted approximately 6000 yr. Short-term oscillations are superimposed on this general climatic change with a major reversal event about 8000 yr B.P. and a second wet pulse leading to a maximum lake volume ca. 7500-6000 yr B.P. Maximum aridity occurred 4300 yr B.P. The major environmental fluctuations recorded at Sumxi-Longmu Co appear in phase with climatic changes recognized in north tropical Africa, suggesting that the 8000 to 7000-yr-B.P. event was caused by an abrupt disequilibrium in the climatic system, as was the Younger Dryas and possibly the 4300-yr-B.P. event.