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Start Over Author "Wang, Sumin" Journal palaeogeography, palaeoclimatology, palaeoecology
5 results on '"Wang, Sumin"'

4. Holocene climate development on the central Tibetan Plateau: A sedimentary record from Cuoe Lake

Author

Wu Yanhong, Gerhard H. Schleser, Jin Zhangdong, Richard W. Battarbee, Andreas Lücke, Xia Weilan, and Wang Sumin

Subjects
Monsoon of South Asia, geography, Plateau, geography.geographical_feature_category, δ13C, Paleontology, Oceanography, Monsoon, Ice core, Stage (stratigraphy), Period (geology), Ecology, Evolution, Behavior and Systematics, Holocene, Geology, Earth-Surface Processes
Abstract

We present a climate record for central Tibet spanning the time between 10500 and 1600 cal years BP from a 5.3-m-long sediment core from Cuoe Lake. The analyses show that high Sr concentration, high TOC content, high C/N ratio and enriched δ13C of lake sediments corresponded to stronger chemical weathering, high productivity, high lake level and warmer/wetter climate and vice versa. As revealed by the variations of these proxies, the climatic evolution during this period can be divided into five stages and several substages. These are a cold/dry stage before 10140 cal years BP, a transition stage from 10140 to 8560 cal years BP, an optimum stage (warm/wet) from 8560 to 5750 cal years BP, a cool/dry stage from 5750 to 4000 cal years BP, a transition stage from 4000 to 3000 cal years BP and a drying-up stage after 3000 cal years BP. These changes are presumably reflections of variations in Indian monsoon intensity which, according to that interpretation, should have been enhanced from 8560 cal years BP, slightly weakened after 5750 cal years BP, and gradually diminished since 3000 cal years BP in this region.

Published
2006

5. Early to mid-Pleistocene ostracod δ 18O and δ 13C in the central Tibetan Plateau: Implication for Indian monsoon change

Author

Jin, Zhangdong, Bickle, Mike J., Chapman, Hazel J., Yu, Jimin, Wang, Sumin, and Chen, Shiyue

Subjects
*PLEISTOCENE paleoclimatology, *MONSOONS, *CLIMATE change, *ISOTOPE geology, *FOSSIL ostracoda, *STREAM chemistry, *LAKE sediments, *CARBON isotopes, *OXYGEN isotopes, *GEOCHEMISTRY
Abstract

Abstract: As one of the pioneering projects of the Chinese Environmental Scientific Drilling (CESD) Program, a 206.5m long sediment core (CE) was retrieved from Co Ngoin (Co = lake) Basin in the central Tibetan Plateau. Limnic records of the abundance of ostracod shells and their oxygen and carbon isotope measurements, together with the geochemical and the sedimentological investigations, were carried out on the interval between 143 and 52m core depths, corresponding to ca. 2.01–0.84Myr. Distinct oscillations of the abundance and the chemical compositions of ostracod shells have yielded the original information about variations in lakewater chemistry in association with the change in the Indian monsoon over the period of 2.01 to 0.84Myr. The climate conditions during the Early Pleistocene were characterized by frequent oscillations and the ostracod records had expressed its synchronous response to these oscillations. A major climate change occurred in the Co Ngoin area at about 0.93Myr. A pronounced fluctuation in ostracod δ 18O and δ 13C during the Mid-Pleistocene transition (MPT) is possibly associated with an increase in continental ice sheets. The compositional and the sedimentological characters of the immediately overlying sediments imply a shallow aquatic environment and also a harsh (salinity?) condition beyond the tolerance limits for ostracod survival, resulting in the disappearance of the Qinghaicypris crassa Huang 1979 around 0.84Myr. [Copyright &y& Elsevier]

Published
2009
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