干旱区生态环境知识资源中心(Arid): 京津冀地区一次强沙尘天气过程的成因及特征

Arid

	京津冀地区一次强沙尘天气过程的成因及特征
其他题名	Causes and characteristics of a dust weather process in the Beijing-Tianjin-Hebei Region
	彭舒龄 1; 周树道 2; 卫克晶 2; 沈奥 3
来源期刊	大气科学学报
ISSN	1674-7097
出版年	2019
卷号	42 期号:6 页码:926-935
中文摘要	利用常规污染物监测资料、卫星资料和再分析资料等,对京津冀地区在2017年春季遭遇的一次强沙尘天气过程进行分析。结果表明,此次过程是由地面冷锋过境,高空槽后冷空气持续补充引起,沙源地主要位于巴丹吉林、腾格里沙漠,随后以西北路径输送至京津冀地区。前期沙源地感热通量迅速增大,与中低层冷平流叠加,导致不稳定层结增强,助于起沙;高空强风速带加强并向下延伸,中低层次级环流发展,不但使沙尘传输并下降至地面,而且使高层高动量和高位涡冷空气下传,促进低空急流形成、低层系统发展,使大风及沙尘天气维持;沙尘过境时,地面至4 km高度存在沙尘型气溶胶, PM_(2.5)和PM_(10)浓度变化趋势较一致并达到重度污染水平,且气溶胶光学厚度( Aerosol Optical Depth,AOD)与空气质量指数( Air Quality Index,AQI)具有较好的时空匹配关系,重污染时段AOD值大于1,污染减弱时AOD值降至0.6以下。
英文摘要	In this study,based on the routine pollutant monitoring data,satellite data,reanalysis data,backward trajectory models,etc., the causes and characteristics of a strong dust weather process which occurred in the Beijing-Tianjin-Hebei region in 2017 was analyzed.The study results showed that the synoptic situation of the cold front was what had mainly led to this process,along with the continuous supplement of cold air after the trough. The major sand-dust sources were located in the Badan Jilin Desert and Tengger Desert.Backward trajectory simulation suggested that the contribution to the increasing dust in the Beijing-Tian-Hebei region originated from the northwest.In addition, the cities surrounding the northwest long-distance trajectories suffered from different levels of pollution.The sensible heat flux increased rapidly in the sand-dust sources,which combined with the cold advection in the middle and lower layers, in turn enhancing the unstable stratification and promoting the sediment discharge.The strong,high-level wind speed strengthened and continued to extend downward.The secondary circulation in the middle and low levels developed,which not only transferred and descended the dust particles,but also caused the high momentum and high potential vorticity of the upper level to pass downward.The low-level jet and systems were formed and developed, thereby maintaining the strong wind and dust weather.The negative horizontal helicity had a high correspondence with the occurrence area of dust weather.When the dust weather was passing through, the dust type aerosol appeared between the surface and a height of 4 km.In addition, the concentrations of PM_(2.5) and PM_(10) exhibited high consistence in variation,and led to the level of severe pollution.Furthermore, the values of aerosol optical depth ( AOD) and air quality index ( AQI) had a high correlation in both the spatial and temporal distributions.The temporal and spatial distributions showed that the value of AOD exceeded 1 during the high pollution period,and dropped below 0.6 when the extent of pollution gradually decreased.
中文关键词	沙尘 ; 感热通量 ; 高低空急流 ; 动量下传
英文关键词	AOD dust sensible heat flux high-and low-level jet momentum down propagation AOD
语种	中文
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:6669320
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/316331
作者单位	1.国防科技大学气象海洋学院;;中国人民解放军61206部队, ;;, 南京;;, 江苏;;北京 211101;;100042, 中国; 2.国防科技大学气象海洋学院;;南京信息工程大学, ;;气象灾害预警与评估协同创新中心, 南京;;南京, 江苏;;江苏 211101;;210044, 中国; 3.中国人民解放军94303部队, 潍坊, 山东 261000, 中国
推荐引用方式 GB/T 7714	彭舒龄,周树道,卫克晶,等. 京津冀地区一次强沙尘天气过程的成因及特征[J],2019,42(6):926-935.
APA	彭舒龄,周树道,卫克晶,&沈奥.(2019).京津冀地区一次强沙尘天气过程的成因及特征.大气科学学报,42(6),926-935.
MLA	彭舒龄,et al."京津冀地区一次强沙尘天气过程的成因及特征".大气科学学报 42.6(2019):926-935.