Field observations on the turbulent features of the near-surface flow fields and dust transport during dust storms

摘要

This study conducted real-time and synchronous measurements on the wind velocities and dust concentrations at various heights during several dust storms passing through the desertified land in northwest China. Under near-neutral stratification conditions, Original data were filtered strictly with the anomalous-point exclusion method and stabilization analysis. Wavelet analysis on the stream-wise wind energy spectrum reveal that there exist Large Scale Motions (LSMs) and Very Large Scale Motions (VLSMs) in the flow fields of dust storms, and the VLSMs above 8m dominate the transport of PM10 in the near-surface layer during dust storms.