More frequency of haze events during recent ten years, caused more and more concern, it is hard to get the comprehensive information only with the ground-based observation.Based on CALIOP/CALIPSO satellite remote sensing data and ground-based routine observations,annual variation of haze events and the vertical spatial distribution characteristics of aerosol optical properties during haze event occurred in the eastern Northwest China(ENWC)was analyzed, to have a deeper understanding of haze events. Taking the haze events occurredin ENWC in March and November 2013 as examples,the aerosol particle shape and size distribution,weathersituation and meteorological elements during haze events were analyzed. The results show that, the frequency ofhaze events in ENWC decreased from 1981 to 2000 firstly and then increased obviously in early 21th century.Haze events occurred most frequently in December,November and January. When haze events occurred, the majority impact area in the troposphere is from 2 km to 4 km above the surface,the aerosol backscatter coefficientranged from 0.8×10-3~2.5×10-3 km-1·sr-1,and the backscatter coefficient decreased firstly with altitude andthen increased gradually. Aerosols volume depolarization ratio was mostly less than 20% in the area,whichmeans most part of aerosols were regular particles. The irregular particles were suspending under 4 km above thesurface the aerosol irregularities were weaken with the increasing of altitude. The value of Color ratio was below 0.8 in the area and centered at 0.0~0.4 between 8 and 12 km in height. Haze events could easily occur when thehigh-altitude and the surface are separately controlled by high-pressure system and uniform pressure,and there istemperature inversion near surface. This work provides advanced method for haze research and may contribute to the improvement on the prediction accuracy of heavy polluted weather.
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