Application of wind profiler radar in a strong sand dust weather analysis in Beijing
LIU Chao1, ZHANG Bi-hui1, HUA Cong1, ZHANG Heng-de1, WU Dong-li2
1. National Meteorological Centre, Beijing 100081, China; 2. Meteological Observation Centre of China Meteorological Administration, Beijing 100081, China
Abstract：A sand dust period occurred from May 3 to 7 2017 was studied based on wind profiles radar data hourly, atmospheric composition data, and ground surface observation data of Beijing. As the results showed that air quality reached heavy polluted level in many places, in which the concentration of PM10 reached heavy polluted level in Beijing had lasted about more than 30 hours in this sand dust period. The horizontal wind, vertical velocity and the atmospheric refraction index structure constant in boundary layer were analyzed. The main results were given as follow:wind speed of the northwest wind jet core average reached 14.8m/s in the boundary layer, and the establishment of jet core could help dust particles to transfer from upper-level to the ground. It was revealed that the ventilation index in sand dust explosion period increased 31.6% than before, and ventilation index of the middle and low layers played an important role gradually, which leaded concentration of PM10 to increase explosively. In addition, the weak descending motion was the main motion, and the vertical velocity was below 1m/s in this sand dust period, while the vertical velocity could reach 5.3m/s before sand dust explosion period. Meanwhile, atmospheric refraction index structure constant reached the maximum value(1.0×10-16). Moreover, vertical velocity and atmospheric refraction index structure constant both were earlier than variation of pollutant concentration, and which had a forecast of about 8 to 9 hours in advance, which could play a reference role in forecasting sand dust in the future.
Duha T A, Deokrye B, Naci M. Chinese Yellow Dust and Korean infant health[J]. Social Science & Medicine, 2017,186:78-86.
[5]
Camino C, Cuevas E, Basart S, et at. An empirical equation to estimate mineral dust concentrations from visibility observations in Northern Africa[J]. Aeolian Research, 2015,16:55-68.
[6]
Masanari W, Hisashi N, Jun K, et al. Association between pulmonary function and daily levels of sand dust particles assessed by light detection and ranging in schoolchildren in western Japan:A panel study[J]. Allergology International, 2016,65(1):56-61.
Liu Q Y, Liu Y J, Yin J X, et al. Chemical characteristics and source apportionment of PM10 during Asian dust storm and non-dust storm days in Beijing[J]. Atmospheric Environment, 2014,91:85-94.
[11]
Wei H, Niu H Y, Zhang D Z, et al. Insights into a dust event transported through Beijing in spring 2012:Morphology, chemical composition and impact on surface aerosols[J]. Science of The Total Environment, 2016,565(15):287-298.
[12]
Cao C X, Zheng S, Ramesh P, et al. Characteristics of aerosol optical properties and meteorological parameters during three major dust events (2005~2010) over Beijing, China[J]. Atmospheric Research, 2014,150:129-142.
[13]
Ruchith R D, Deshpande S M, Ernest Raj P, et al. UHF wind profiler observations of monsoon low-level jet (MLLJ) and its association with rainfall over a tropical Indian station[J]. Atmósfera, 2016,29(1):1-9.
[14]
Yoshikazu T, Hiroyuki H, Masayuki K, et al.Lower tropospheric horizontal wind over Indonesia:A comparison of wind profiler network observations with global reanalyses[J]. Journal of Atmospheric and Solar-Terrestrial Physics, 2011,73(9):986-995.
