气象与环境学报2025，Vol.41Issue(4)：95-103,9.DOI:10.3969/j.issn.1673-503X.2025.04.011
东北冷涡背景下沙尘天气微气象学及输送特征的观测研究
Observations on micrometeorological and transport characteristics during dust events under the background of Northeast China Cold Vortex(NCCV)
摘要
Abstract
Northeast China Cold Vortex(NCCV)is one of the important weather systems affecting Northeast Chi-na.However,there is still limited understanding on the formation and transport characteristics of dust events under the NCCV background.Using the three-dimensional synchronous observational data of meteorological elements and dust parameters in Shenyang in the spring of 2023,combined with backward trajectory analysis,we analyze the characteristics of micrometeorological conditions and dust transport and reveal the impacts of near-surface turbu-lence during three dust events of different intensities under the influence of the NCCV.The results show that affect-ed by the NCCV,near-surface turbulence activity was vigorous before the occurrence of dust events.The cold vor-tex system induced precipitation and made the ambient humidity increase,which is different from dust events with-out the influence of the NCCV.During the dust emission stage of the two blowing-sand events,the lower atmos-phere was thermally unstable,and the dust concentration increased significantly with the enhancement of friction velocity(u∗)and turbulence kinetic energy,mainly due to local dust emission.In the later stage of the blowing-sand event on 11 April,affected by weak winds and high humidity environment,the proportion of fine particulate matter(PM2.5)increased,and dust-haze pollution coexisted.Compared with blowing sand events,the atmospheric stratification was stable during dust emission stage of the floating dust event,and there was no significant synchro-nous variation relationship between u∗and dust concentration near the surface,meaning dust transport from exter-nal sources.The results of the backward trajectory analysis showed that the three dust events were all influenced by dust external sources to varying degrees.Massive dust aerosols were transported to Northeast China by the upper-level northwesterly airflow through Mongolia and other places,with the aerosol transport height concentrated be-tween 1.0 and 1.5 km.关键词
东北冷涡/沙尘天气/微气象学/沙尘输送/湍流Key words
Northeast China Cold Vortex/Dust events/Micrometeorology/Dust transport/Turbulence分类
天文与地球科学引用本文复制引用
XIA Jiaqi,XU Shuang,LI Xiaolan,LI Liguang,SHEN Lidu,ZHAO Hujia,WANG Dongdong,ZHOU Chunxiao..东北冷涡背景下沙尘天气微气象学及输送特征的观测研究[J].气象与环境学报,2025,41(4):95-103,9.基金项目
国家自然科学基金面上项目(42575101、42475193)、中国气象局气象能力提升联合研究专项(24NLTSQ011)、辽宁省防沙治沙科技重大专项(2023JH1/10400001)、中国气象局沈阳大气环境研究所联合开放基金课题(2024SYIAEKFZD01)和辽宁省气象局核心攻关项目(HXGGQ202403)共同资助. （42575101、42475193）
