[Research on impact of dust event frequency on atmosphere visibility variance: a case study of typical weather stations locating in the dust route to Beijing].
Relationship between dust event frequency and atmosphere visibility deviation is analyzed by using the data of daily visibility and various dust events in Beijing and other 13 typical weather stations locating in the dust events route to Beijing from 1971 to 2000. Results show that the visibility variance increases a standard deviation in the response to the dust event frequency decrease once. The influence of dust event to visibility comes from the high-frequency change of wind velocity. The change of wind velocity in one standard deviation can result in dust event frequency increasing by 30%. The high-frequency changes of near-surface wind influence the occurrence of dust event, and also the fluctuation of daily visibility deviation. The relationship between abnormal low visibility event and visibility deviation is in significant positive correlation. The increase of wind average distance leads to the enhance frequency of dust event and consequently the abnormal low visibility event. There are different relationships between abnormal low visibility event and floating dust, sandstorm and flying-dust respectively.
Qiu
Yu-jun
YJ
China Center of Desert Research, Beijing Normal University, China.
Zou
Xue-yong
XY
Zhang
Chun-lai
CL
D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D002681:China; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring; D010316:Particle Size; D014887:Weather; D014919:Wind
D000393:Air Pollutants; D004391:Dust