POLLEN-INFERRED AND DIATOM-INFERRED CLIMATIC AND HYDROLOGICAL CHANGES IN SUMXI CO BASIN (WESTERN TIBET) SINCE 13,000 YR BP

被引:253
作者
VANCAMPO, E [1 ]
GASSE, F [1 ]
机构
[1] UNIV PARIS 11, HYDROL & GEOCHIM ISOTOP LAB, URA 723, GDR 970, F-91405 ORSAY, FRANCE
关键词
D O I
10.1006/qres.1993.1037
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
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. © 1993 University of Washington.
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页码:300 / 313
页数:14
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