Grain size record of microparticles in the Muztagata ice core

摘要

The dust transport and sediment characteristics are discussed based on analysis of mi-croparticle size and size distribution in the Muztagata ice core at 6350 m a.s.I. The finer particles with diameter of 1—5 μm are the dominant fraction in number, while middle and coarse particles mainly contribute to the total volume. The lognormal distribution characteristics can be seen for some high concentration samples, showing that model size and standard variation are greater than that in the Greenland ice cores. However, size-volume distribution of some low concentration samples is abnormal. Those distributions reflect the dust deposit process in high mountain glaciers at mid-low latitudes and show differences from those in polar ice sheet.