关键词: 黄河, 砂粒含量, 东亚季风

Abstract: The loess in Western Henan Province contains abundant of sand (63 μm), which is caused by the special relief in the region. The Kouma loess section has recorded the change of sand content since 1.2 Ma BP. Global climatic change is the main factor for the temporal and spatial variation of the sand content. The relief change superimposes on the global change. With the downcutting of the Yellow River, a great deal of loose sediments are exposed to the air, which provide abundant of dust for the Asia Winter Monsoon. The Fenwei Basin, Sanmenxia Basin, the bottomland and sand beach of the Yellow River, and the mountains along the Yellow River are the main source zones of sand in loess in Western Henan Province.

Key words: Yellow River, sand content, East Asia Monsoon