Page 115 - 《高原气象》2025年第5期

5 期 黄 鑫等：陕西省冬季持续性区域性霾事件大气环流异常及前兆信号 1233

The Circulation Anomalies of the Winter Persistent Regional Haze

Events in Shaanxi Province and Their Precursor Signal

1， 2
1， 2
HUANG Xin ， HE Yin ， PAN Liujie ， DONG Zipeng ， LIU Hui ，
2， 3
2， 4
2， 3
HE Huibo ， DANGRui ， REN Qi 2， 5
1， 2
1， 2
（1. Shaanxi Meteorological Information Center， Xi’an 710014， Shaanxi， China；
2. Key Laboratory of Eco-Environmental and Meteorology for the Qinling Mountains and
Loess Plateau， Xi’an 710014， Shaanxi， China；
3. Meteorological Observatory of Shaanxi Province， Xi’an 710014， Shaanxi， China；
4. Meteorological Institute of Shaanxi， Xi’an 710014， Shaanxi， China；
5. Meteorological Observatory of Yulin， Yulin 790000， Shaanxi， China）

Abstract： 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 re‐
gion is found to be closely connected with a pronounced atmospheric teleconnection pattern from the North Atlan‐
tic 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 conti‐
nent at 500 hPa three days prior to and after the occurrence day of persistent regional haze events in Guanzhong
during winter. On the 1 to 6 day， a clear positive geopotential height anomaly extends from Northeast China to
ST
th
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 in‐
tensifies the convergence in Guanzhong region and Southern Shaanxi， and transport the aerosol from central and
eastern China to Shaanxi Province.
Key words： persistent regional haze events； the North Atlantic Oscillation； the East Atlantic/West Russia pat‐
tern； Shaanxi； the stronger southeast wind