基于环流指数研究天津长序列细颗粒物大气污染气象条件演变规律

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Abstract Based on multiple climate system monitoring indices from Beijing Climate Center and the synthesis meteorological condition index for PM_2.5 pollution over Tianjin constructed from outputs of Tianjin environmental model, the evaluation methodology for meteorological conditions of air pollution in Tianjin based on circulation indices was established to study the impacts of weather and climatic condition changes on PM_2.5 diffusion in Tianjin from 1951 to 2021. Results show that the highly correlated circulation indices with springtime PM_2.5 pollution meteorology in Tianjin are East Atlantic teleconnection index, tropical North Atlantic SST index and Scandinavian teleconnection index. In summer, the PM_2.5 pollution meteorology in Tianjin is closely correlated with the location of the subtropical high, and the high correlation circulation indices are the location indices of the northern boundary of the Indian subtropical high and the northern boundary of the South China Sea subtropical high. The variations of Asian zonal and meridional circulation indices in autumn and winter are of good significance to the concurrent PM_2.5 pollution meteorology in Tianjin. Specifically, the variations of Arctic Oscillation index and polar vortex intensity index in the Northern Hemisphere can reflect the intensity and frequency of cold air activities affecting China in autumn and winter. The temporal correlation coefficient (TCC) with the PM_2.5 pollution meteorology in Tianjin in autumn and winter is 0.45 and 0.66, respectively. By using our proposed PM_2.5 pollution meteorology index based on large-scale circulations, the TCC between the meteorological conditions for PM_2.5 pollution in Tianjin and the estimated meteorological conditions by the numerical model is 0.80. Furthermore, according to the data analyses, the mean interannual variations in meteorological conditions for PM_2.5 pollution in Tianjin from 1951 to 2021 was 2.56%. The difference between the extreme peak and valley values and the averaged values were 7%~8%, with the worst one in the 1980s and the best one in the 1950s. Moreover, the difference in the 2010s outperformed the historical average of 1.61%.

Key words： circulation index atmospheric diffusion condition Tianjin

Received: 15 July 2022

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X513

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	Articles by authors
	CAI Zi-ying
	HAN Su-qin
	QIU Xiao-bin
	YAO Qing
	WANG Jing
	FAN Wen-yan
	YANG Xu
	HAO Jian
	TANG Ying-xiao
	ZHANG Min

Cite this article:

CAI Zi-ying,HAN Su-qin,QIU Xiao-bin等. Study on the evolution of meteorological conditions of air pollution in Tianjin based on circulation index[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 993-1001.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/993

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