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图7 关中冬季126次持续性区域性霾事件第1~6天925 hPa风场异常合成(矢量, 单位: m·s )
打点区域表示通过了95%的信度检验; 灰色区域表示海拔大于850 m
Fig. 7 Instantaneous fields of the composite horizontal 925 hPa wind anomaly from day 1 to day 6 for the 126 winter persistent
haze events in Guanzhong (vector, unit: m·s ). The dots regions indicate statistical significance exceeding the 95%
-1
confidence level. The grey area covers the region with altitude greater than 850 m
为 EATL/WRUS 正位相模态, 因此未来对于 NAO (11): 7373-7387.
与 EATL/WRUS的联系值得未来进一步研究。持续 Chen H P, Wang H J, 2015. Haze days in north China and the associ‐
ated atmospheric circulations based on daily visibility data from
时间大于 7 天的持续性区域性霾事件危害更大(穆
1960 to 2012[J]. Journal of Geophysical Research Atmospheres,
泉和张世秋, 2013), 未来有必要对持续时间大于 7
120(12): 5895-5909.
天的持续性区域性霾事件进行分析研究, 探讨其前 Chen S F, Guo J P, Song L Y, et al, 2019. Temporal disparity of the
兆信号及环流演变, 并且分析持续性区域性霾事件 atmospheric systems contributing to interannual variation of win‐
与非持续性霾的环流差异。从气候变化的角度上 tertime haze pollution in the North China Plain[J]. International
来讲, 西北地区暖湿化也会通过影响冬季气溶胶吸 Journal of Climatology, 40(1): 128-144. DOI: 10. 1002/joc.
6198.
湿性增长等对陕西霾污染的变化造成影响, 未来也
Chen S F, Guo J P, Song L Y, et al, 2020. Intra-seasonal differences
值得进一步研究(张强等, 2023)。
in the atmospheric systems contributing to interannual variations
参考文献(References): of autumn haze pollution in the North China Plain[J]. Theoretical
Applied Climatology, 141: 389-403. DOI: 10. 1007/s00704-
Barnston A G, Livezey R E, 1987. Classification, seasonality and per‐ 020-03221-4.
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Monthly Weather Review, 115: 1083-1126. conditions for the occurrence of persistent haze events in North
Bei N F, Li G H, Huang R J, et al, 2016. Typical synoptic situations China[J]. Engineering, 23(2): 266-271.
and their impacts on the wintertime air pollution in the Guan‐ Li M Y, Yao Y, Simmonds I, et al, 2021. Linkages between the atmo‐
zhong basin, China[J]. Atmospheric Chemistry and Physics, 16 spheric transmission originating from the North Atlantic Oscilla‐

