基于陕西省地面气象观测站观测资料、NCEP/NCAR逐日再分析等资料，对1980-2021年冬季陕西省关中历次持续性区域性霾事件的逐日背景环流和前兆信号进行了分析。冬季关中持续性区域性霾事件与北大西洋至欧亚大陆显著的大气遥相关环流型联系密切。正位相的北大西洋涛动（NAO+）和正位相的东大西洋/西俄罗斯（EATL/WRUS+）是与持续性区域性霾事件联系的重要遥相关型的一部分，正位相北大西洋涛动（NAO+）是此环流型的起始模态。约 75% 持续性区域性霾事件发生前 15天至前 5天的NAO正位相天数大于5天，每天NAO指数大于或者接近0，平均强度大于0。关中冬季持续性区域性霾事件出现时的前 3 天至第 3 天 500 hPa 欧亚大陆存在明显正位相 EATL/WRUS 遥相关型，第 1~6 天850 hPa 中国东北至日本海为明显的位势高度正异常，反映了朝鲜半岛至中国中部地区气压梯度正异常，关中地区近地面存在东南风异常，增强了关中及其以南地区大气辐合，并且有利于将我国中东部地区气溶胶输送到陕西。

Based on daily observations from ground-level stations and daily NCEP/NCAR reanalysis dataset，the circulation anomalies of the winter persistent regional haze events for the years 1980-2021 in Guanzhong region of Shaanxi and their precursor signal are analyzed. The winter persistent regional haze events in Guanzhong region is found to be closely connected with a pronounced atmospheric teleconnection pattern from the North Atlantic to Euraisa. A positive North Atlantic Osciilation（NAO+）phase and a positive East Atlantic/West Russia（EA/ WR+）phase are observed as important part of this teleconnection pattern，the NAO+ pattern act as the origin of the atmospheric transmission. Approximately 75% of the NAO positive phase days from 15 to 5 days before the occurrence of persistent regional haze events are greater than 5 days，with a daily NAO index greater than or close to 0 and an average intensity greater than 0. There is a clear EATL/WRUS+ pattern in the Eurasian continent at 500 hPa three days prior to and after the occurrence day of persistent regional haze events in Guanzhong during winter. On the 1^ST to 6^th day，a clear positive geopotential height anomaly extends from Northeast China to the Sea of Japan at 850 hPa，which reflects the positive anomaly pressure gradient from the Korean Peninsula to central China accompanied with stronger southeast wind in Guanzhong. The stronger southeast wind anomaly intensifies the convergence in Guanzhong region and Southern Shaanxi，and transport the aerosol from central and eastern China to Shaanxi Province.