Pathways of Environmental Diagenesis and Their Effects on the Acquisition of Natural Remanent Magnetization Recorded in Chinese Loess and Paleosol

黄土沉积物粒度、化学成分和磁性的变化记录了中国黄土高原地区世纪至千年尺度的夏季降水和冬季沙尘暴突变。研究人员将通过对沉积物中降水和温度变化的古记录进行校准，进一步提高对中国古气候相对变化的定性认识。从西北的西宁到东南的环县，一个已知温度和降雨变化的三样带将作为时间的函数进行采样，追溯到过去的13万年。这些样品将在野外和实验室中进行粒度、化学成分和磁性的研究，以建立准确的古气候记录。

Banerjee EAR-0003421 Century to millennial scale abrupt changes in summer rainfall and winter dust storms in the loess plateau region of China have been recorded in the varying grain-size, chemical composition and magnetic properties of the wind-borne loess sediments. The investigator will advance the current qualitative understanding of the relative variations in paleoclimate of China by calibrating the paleo-records from sediments in terms of rainfall and temperature variations. From Xining in the north-west to Huanxian in the south-east, a three-site transect with known temperature and rainfall variations will be sampled as a function of time, back to the last 130,000 years. These samples will be studied for their grain-size, chemical composition and magnetic properties, both in the field and in the laboratory, to establish an accurate paleoclimate record.