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国家自然科学基金(40301009)

作品数:4 被引量:29H指数:3
相关作者:邬光剑姚檀栋李真汶林科段克勤更多>>
相关机构:中国科学院更多>>
发文基金:国家自然科学基金中国科学院知识创新工程国家重点基础研究发展计划更多>>
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Grain size record of microparticles in the Muztagata ice core被引量:3
2006年
The dust transport and sediment characteristics are discussed based onanalysis of mi-croparticle size and size distribution in the Muztagata ice core at 6350 m a.s.I. Thefiner particles with diameter of 1—5 μm are the dominant fraction in number, while middle andcoarse particles mainly contribute to the total volume. The lognormal distribution characteristicscan be seen for some high concentration samples, showing that model size and standard variation aregreater than that in the Greenland ice cores. However, size-volume distribution of some lowconcentration samples is abnormal. Those distributions reflect the dust deposit process in highmountain glaciers at mid-low latitudes and show differences from those in polar ice sheet.
WU Guangjian1,2, YAO Tandong1,2, XU Baiqin1,2, LI Zheng2, TIAN Lide1,2, DUAN Keqin2 & WEN Linke2 1. Laboratory of Environment and Process on Tibetan Plateau, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
关键词:ICE
Seasonal variations of dust record in the Muztagata ice cores被引量:3
2008年
Based on the oxygen isotope ratio and microparticle record in ice cores recovered at Mt. Muztagata, Eastern Pamirs, the seasonal variations of atmospheric dust have been reconstructed for the past four decades. High dust concentrations and coarser particle grains have the similar trend with oxygen iso- tope value. Our statistical results indicate that 50%―60% high dust concentration samples occur dur- ing the season with high oxygen isotope values (summer), while low dust storm frequency during spring and winter. Back-trajectory analysis shows that the air mass hitting Muztagata predominately came from West Asia (such as Iran-Afghanistan Plateau) and Central Asia, which are the main dust source area for Muztagata. Dust storms in those source areas most frequently occur during summer (from May to August), while frequent dust storm events in northern China mainly occur during spring (March to May). Regions in the path of Asian dust transport, such as in Japan, the North Pacific, and Greenland, also show high dust concentrations during spring (from March to May). Our results indicate that dust storms have different seasonality in different regions within Asia.
WU GuangJianYAO TanDongXU BaiQingTIAN LiDeLI ZhenDUAN KeQin
关键词:冰层氧同位素
冰芯中不溶微粒的研究进展被引量:18
2005年
冰芯中的微粒是反映大气粉尘的直接指标,其研究内容包括浓度、通量、粒径和矿物组成等在不同时期的变化特征以及其对全球气候的影响.简要地介绍大气粉尘对全球气候的影响,总结了近年来冰芯中的微粒研究以及用于解释末次冰盛期时高粉尘的几个气候模型的主要进展,着重讨论利用微粒的同位素特征来确定其来源以及利用微粒记录进行定年的方法与结果.
邬光剑姚檀栋
关键词:冰芯微粒大气粉尘气候变化
慕士塔格冰芯中微粒的粒度记录被引量:10
2006年
通过慕士塔格海拔6350m高度处冰芯中微粒的粒度和粒径分布特征的分析,初步获得了该支冰芯所反映的大气粉尘搬运与沉积特征.在数量上,细颗粒(<5μm)占主要成分;而在体积分布上,粗颗粒有重要的贡献,而且高浓度样品的粒径-体积关系符合对数正态分布特征,具有比格陵兰冰芯样品更大的体积众数粒径和标准偏差;但是部分低浓度样品的体积分布特殊,不符合这一特征.慕士塔格冰芯的粒度记录反映了高海拔近源区粉尘的沉积特点,与远源沉积的极地冰芯存在差别.
邬光剑姚檀栋徐柏青李真田立德段克勤汶林科
关键词:慕士塔格冰芯微粒粉尘粒径分布
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