沙尘暴沉降物的粒度特征及其环境意义

近年有些研究者尝试用黄土中更为敏感的粒度指标指示冬季风的强度。笔者列举、分析了若干不同强度、不同源地的沙尘暴事件，总结了沙尘沉积物粒度与风力、源区覆被状况、距源区距离等因素的关系，认为沙尘粒度组成是由多因素决定的。作为地史上沙尘暴活动产物的黄土，其粒度组成并不是冬季风的单一函数。黄土粒度中包含了冬季风强度、源区覆被、距源区远近等多方面信息。因此，在用黄土粒度恢复冬季风强度时，必须结合其他代用指标。

Grain Size Distribution Characteristics of Deposits from Recent Sand-dust Storms and Its Environmental Significance

Some cases of recent sand-dust storm with variety of intensity and origination area were cited in this paper, and the relationship between sand-dust grain size and the other three factors including wind force, land cover and distance away from origination area was discussed. It is thought that grain size characteristics of deposits are controlled by no less than wind force. Grain size of the loess (as the product of paleo-sand-dust storm) is not the single function of winter monsoon. The grain size of loess includes much information such as winter monsoon, land cover of origination area and distance away from origination area etc. So we should connect grain size with other proxies of environment to recover paleoclimate.