2020年春季中国北方一次扬沙天气过程微气象学与沙尘输送特征

doi:10.3969/j.issn.1673-503X.2022.04.003

Abstract

Abstract:

Based on multilevel observations of meteorological variables and surface atmospheric particulate matter (i.e.PM_2.5 and PM₁₀ in this study) mass concentration in Horqin Sandy Land area and Shenyang, we analyzed the characteristics of micro-meteorology and dust transportation during a blowing dust event on May 10, 2020, in northern China.The results indicate that during the blowing dust event affected by large-scale synoptic systems, wind speed at different heights (< 20 m) over the Horqin Sandy Land area increases significantly and ambient relative humidity at each level and surface water content both decrease.Enhanced turbulent dynamic activity along with dry air and soil conditions is conducive to the release of massive dust particles from the surface of sand source areas into the atmosphere.Thereafter, these dust particles are transported to the downstream areas with the strong northwesterly airflow, concentrating at altitudes below 2 km.Due to the long-range transport of dust particles, the hourly mean PM₁₀ concentration in Shenyang on May 10 increased up to 817 μg·m^-3, and the visibility decreased to 3.7 km.During the dust emission period in the Horqin Sandy Land area, visibility exhibits a significant negative correlation with friction velocity (correlation coefficient R²=0.93) and a weaker negative correlation with kinetic turbulent vertical heat flux, meaning that the turbulent dynamic effect plays a leading role in the dust emission process.

Key words: Blowing dust weather, Micrometeorology, Dust transport, Horqin Sandy Land area

CLC Number:

P404

Yi-meng ZHANG, Xiao-lan LI, Hong-sheng ZHANG, Ye HONG. Micrometeorological characteristics and dust transport during a blowing sand event in the spring of 2020 over northern China[J]. Journal of Meteorology and Environment, 2022, 38(4): 19-26.

Figures/Tables 9

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观测项目	观测内容	仪器名称和生产厂家	型号	观测高度/m	采样时间/min	精度
塔层廓线	风速廓线风向温度廓线湿度廓线气压	轻型低阈值风杯风速计(英, Vector Ins.) 轻型低阈值风杯风速计(英, Vector Ins.) 温湿度传感器(芬，Vaisala) 温湿度传感器(芬，Vaisala) 气压传感器(芬，Vaisala)	A100M A100M HMP45C HMP45C PTB110	2、4、16、20 20 2、4、8、16 2、4、8、16 8、16	10	0.1 m·s^-1 ±3 ° 0.2 ℃ ±3% 0.5 hPa
辐射	太阳辐射反射辐射净辐射	短波辐射表(美，LiCor) 短波辐射表(美，LiCor) 净辐射表(荷，Kipp&Zonen)	LI200X LI200X Nr-Lite	2	10	1% 1% 1%
能见度	能见度	散射式能见度仪	CS120A	8	10	10 m

Micrometeorological characteristics and dust transport during a blowing sand event in the spring of 2020 over northern China

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