关键词: 浮尘天气, PM10, 观测标准

Abstract: Based on PM10 and meteorological data during nearly 4 years in Dalian, the temporal distributions of PM10 and meteorological elements such as visibility, relative humidity, wind direction and wind speed during dust floating processes were studied. The results showed that PM10 increased abruptly when floating dust came, and the average PM10 densities in 24 hours and during the processes were over 300 μg·m-3 and the duration exceeded 16 hours; During the dust floating processes, the relative humidity varied from 13% to 97%, and the visibility varied from 1 049 to 9 002 m, and the dominant wind direction was north, and the wind speed varied from 0 to 12 m·s-1. An new observation criteria for floating dust processes was put forward after integrated analysis. The new criteria, on bases of keeping in coherence with the existing criteria, can provide scientific quantitative assessment on remote dust-effected region. The validation of the new observation criteria showed a good result and its execution could avoid the errors of manual observation.

Key words: dust floating weather, PM10, observation criteria