| RELATIVE BRIGHTNESS INDEX AND IT‘S CLIMATIC SIGNIFICANCE FROM LACUSTRINE SEDIMENT OF NAPAHAI LAKE，NORTHWESTERN YUNNAN PLATEAU，CHINA |
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| 引用本文： | YINYong FANGNian－qiao 等.RELATIVE BRIGHTNESS INDEX AND IT‘S CLIMATIC SIGNIFICANCE FROM LACUSTRINE SEDIMENT OF NAPAHAI LAKE，NORTHWESTERN YUNNAN PLATEAU，CHINA[J].中国地理科学,2002,12(3):249-253. |
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| 作者姓名： | YINYong FANGNian－qiao |
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| 作者单位： | [1]TheKeyLaboratoryofCoast＆IslandDevelopment,NanjingUniversity,Nanjing210093.P.R.China [2]ChianUniversityofGeosciences,Beijing100083,P.R.China |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | Information on the palaeoenvironment from Late Pleistocene to Holocene in northwestern Yannan Plateau has been deduced from a study of a 28.81m-long core taken from Napahai Lake.The results from Relative Brightness In-dex(RBI) as well as those from the lithological analyses of bulk sediments,total organic carbon and granulometric analy-ses have been used to reconstruct the environmental and climatic evolution of the area.The ages were provided by three ^14C datings.The record suggested a climate fluctuation between warm-dry and cool-wet from ca.57 to 32ka B.P.which led a shallowing and swamping of the lake.The water level again increased quickly at ca.32ka B.P.,reached itˊs peak during LGM(Last Glacial Maximum,ca.18-20kaB.P.)and remained relative high until ca.15kaB.P.The high wa-ter level at LGM is attributed to cold-wet conditions.The area experienced an abrupt and unstable climatic changes dur-ing the transition period form 15 to 10ka B.P.with a dominated littoral environment.Awarm-dry climate led to the contrac-tion of the lake during the Holocene and reed-swamps became dominant..After a minor wet-cool pulse during the Late Holocene,the modern climate became to be established.
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| 关 键 词： | 总有机碳 颗粒尺寸 古气候 云南 那帕海 湖泊沉积物 |
| 收稿时间： | 29 April 2002 |
Relative brightness index and it’s climatic significance from lacustrine sediment of napahai lake, northwestern yunnan plateau, china |
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| Yong Yin,Nian-qiao Fang,Chao-yong Hu,Hao-gang Nie,Zun-li Qing.Relative brightness index and it’s climatic significance from lacustrine sediment of napahai lake, northwestern yunnan plateau, china[J].Chinese Geographical Science,2002,12(3):249-253. |
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| Authors: | Yong Yin Nian-qiao Fang Chao-yong Hu Hao-gang Nie Zun-li Qing |
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| Institution: | (1) The Key Laboratory of Coast & Island Development, Nanjing University, 210093 Nanjing, P. R. China;(2) China University of Geosciences, 100083 Beijing, P. R. China;(3) China University of Geosciences, 430074 Wuhan, P. R. China |
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| Abstract: | Information on the palaeoenvironment from Late Pleistocene to Holocene in northwestern Yannan Plateau has been deduced from
a study of a 28. 81m-long core taken from Napahai Lake. The results from Relative Brightness Index (RBI) as well as those
from the lithological analyses of bulk sediments, total organic carbon and granulometric analyses have been used to reconstruct
the environmental and climatic evolution of the area. The ages were provided by three 14C datings. The record suggested a climate fluctuation between warm-dry and cool-wet from ca. 57 to 32ka B. P., which led a
shallowing and swamping of the lake. The water level again increased quickly at ca. 32ka B. P., reached it’s peak during LGM
(Last Glacial Maximum, ca. 18–20ka B. P.) and remained relative high until ca. 15ka B. P. The high water level at LGM is attributed
to cold-wet conditions. The area experienced an abrupt and unstable climatic changes during the transition period from 15
to 10ka B. P. with a dominated littoral environment. A warm-dry climate led to the contraction of the lake during the Holocene
and reed-swamps beoame dominant. After a minor wet-cool pulse during the Late Holocene, the modern climate became to be established.
Foundation item: Under the auspices of the National Natural Science Foundation of China (No. 49672135) and National Key Project
for Basic Research (No. G1998040800).
Biography: YIN Yong (1964 -), male, a native of Wuxi, Jiangsu Province, senior engineer, post-doctor research fellow of the
Key Laboratory of Coast & Island Development, Nanjing University. His research interests include climate change and monsoon.
E-mail: Yinyong@nju.edu.cn |
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| Keywords: | Relative Brightress Index total organic carbon particle size palaeoclimate Napahai Lake |
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