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Concentration of nitrate in the Guliya ice core from theQinghai-Xizang Plateau and the solar activity

Chinese Science Bulletin 1998年第10期43卷 841-844页

作者： Ninglian Wang Tandong Yao L. G. Thompson Chinese Acad Sci Lanzhou Inst Glaciol & Geocryol Beijing 100864 Peoples R China Ohio State Univ Byrd Polar Res Ctr Columbus OH 43210 USA

The variations of NO\+-\-3 concentration in the Guliya ice core are reconstructed for recent about 1 000 a. Spectrum analysis of NO\+-\-3 indicates significant periodicities in the variations of NO\+-\-3 concentration, which coincide with the periodicities of the solar activity. Therefore, a positive correlation between the variations of NO\+-\-3 concentration and the solar activity is found.

关键词： Guliya ice core NO - 3 concentration solar activity.

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Ice core dust particulate by XPS-SEM/EDAX——Impact of dust particulate on SO_4^(2-) record in ice cores

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Chinese Science Bulletin 1999年第15期44卷 1424-1427页

作者： LI Zhongqin , LU Gongxuan , LIU Baozhong , FU Hongxiang LIU YuTianshan glaciological Station , lanzhou institute of glaciology and geocryology , Chinese Academy of Sciences , lanzhou 730000,China State Key Laboratory for Oxo Synthesis and Selective Oxidation, lanzhou institute of Chemical Physics , Chinese Academy ofSciences , lanzhou 730000, China, Tianshan glaciological Station Lanzhou Inst. Glaciol. Geocryology Chinese Academy of Sciences Lanzhou 730000 China State Key Lab. Oxo Synthesis S. Lanzhou Inst. of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

The ice core dust particulate sampled from Mt. Xixabangma has been analyzed by means of X-ray photoelectron spectrometer （XPS） and scanning electron microscope with energy dispersion X-ray analysis （SEM/EDAX）. The results show that the contents of SO42- and SO32- in the surface layer of the dust are significantly higher than those in the subsurface layer （with the exception of organic sulfide）. This difference indicates that the surface SOx has been captured and then chemically converted by the atmospheric dust particulate before its deposition with snow, which is obviously different from those inner layer sulfates and sulfites contained by dust itself. In addition, it has been determined by SEM/EDAX that the dust contains relatively high concentrations of transition metal elements such as Fe and Ti oxides which could function as photocatalysts to the conversion of SOx adhered on the surface of the dust, and consequently accelerate the deposition of SOx to snow. Our research also

关键词： ice core records dust partculate sulfate ions.

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A 1 835 a tree-ring chronology and its preliminary analyses in Dulan region, Qinghai

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Chinese Science Bulletin 1997年第13期42卷 1122-1124页

作者： Kang, XC Graumlich, LJ Sheppard, P lanzhou inst. glaciol. geocryology Chinese Academy of Sciences Lanzhou 730000 China Laboratory of Tree-Ring Research University of Arizona Tucson AZ 85721 United States

TREE-ring analysis is one of the important ways for paleoclimatic reconstruction because tree-ring series of several hundred or even thousands of years are available, and can be matched orextended and accurately dated, and the tree rings can record changes in climate. In China,several thousand paleoclimatic series of data are obtained from the historical documents,

关键词： tree-ring chronology paleoclimate Dulan region.

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