晚更新世以来中国北方典型剖面记录的大气粉尘载荷与空间差异性  

ATMOSPHERIC DUST LOADS AND SPATIAL DIFFERENCE IN NORTH CHINA SINCE LATE PLEISTOCENE:RECORDS FROM TYPICAL SECTIONS

作　　者：赵锦慧[1] 何超[1] 赵丽娅[1] 鹿化煜[2] 

机构地区：[1]湖北大学资源与环境学院,武汉430062 [2]南京大学地理与海洋科学学院,南京210093

出　　处：《海洋地质与第四纪地质》2016年第2期153-160,共8页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(41401559);湖北省科技厅项目(2014CFB558);湖北省教育厅项目(D20141001)

摘　　要：选取塔勒德、盘子山、延长、库伦沟4个黄土剖面,对比分析磁化率曲线、粒径含量曲线、载荷曲线、δ18 O（‰）含量曲线,运用古粉尘载荷数量作为古气候代用指标,恢复古粉尘载荷数量的时空差异,结果表明冰期的古粉尘载荷数量高于间冰期（相差1.34~4.34倍）,并且冰期粉尘载荷的变化具有高频波动的特征;在空间尺度上,自西向东粉尘载荷量降低。结论为进一步通过粉尘堆积较为准确地反演中国北方干旱半干旱地区自西向东的气候环境变迁提供依据。Four loess sections of Talede、Panzishan、Yanchang and Kulungou have been selected as typical sections to recover the ancient dust load quantity and their temporal and spatial distributions in this paper.Magnetic susceptibility curve,particle content curve,load curve andδ18 O（‰）content curve are used as paleoclimate proxies for study of ancient dust load quantity.The results show that the amount of dust load is higher in glacial stage than that in interglacial stages（A difference may be as high as 1.34-4.34times）,and changes in dust load is characterized by high-frequency fluctuation in the glacial.With regard to the spatial distribution,dust load decreases from the west to the east.The distribution of dust load could be used as aproxy for environmental and climatic reconstruction.

关 键 词：古粉尘沉降 载荷曲线 古大气环流 晚更新世以来 中国北方干旱半干旱地区 

分 类 号：P532[天文地球—古生物学与地层学]