In this paper, the global NCEP reanalysis data, hourly pollutant concentration data, wind profiler radar and ground routine observation data in Beijing were used to analyze a haze-dust pollution process from March 26 to March 29, 2018. The results showed that the PM2.5 peak concentration was 242 μg·m-3, and PM2.5/PM10 ratio was 0.86 during haze period. Affected by Mongolian cyclone, the concentration of PM10 increased explosively, and the growth rate reached 912 μg·m-3·h-1, and the proportion of PM2.5/PM10 decreased to 0.11. By analyzing of the horizontal wind field, ventilation index and vertical velocity in the boundary layer, it could be seen that the southwest wind dominated the boundary layer during haze period, and the average ventilation index was 15 907 m2·s-1. The steady weak upward or subsidence movement was dominant. In the period of sand, the average ventilation index was 9 226 m2·s-1. Vertical velocity was earlier than variation of pollutant concentration in advance. Based on the backward trajectory model and potential source contribution analysis method (PSCF) results, central and southern Hebei province and central Shanxi province contributed significantly to PM2.5 in Beijing during the haze period. While in the sand period, the PM10 concentration in Beijing was mainly from the central of Inner Mongolia and western of Liaoning province.
Liu Chao
,
Hua Cong
,
Zhang Hengde
,
Zhang Bihui
. Analysis of A Haze-Dust Air Pollution Process in Spring of Beijing Based on Wind Profiler Radar[J]. Journal of Desert Research, 2019
, 39(5)
: 88
-96
.
DOI: 10.7522/j.issn.1000-694X.2019.00010
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