2013~2019年上海早晨接地逆温指标与PM<sub>2.5</sub>定量关系研究

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Abstract SBI was one of the most important meteorological conditions favorable for the PM_2.5 pollution. In this article, the high-resolution radiosonde measurements launched at 08:00 (LST) at Shanghai Baoshan observatory during 2013 and 2019 were collected to explore the characteristics of SBI parameters (vertical temperature difference, depth and intensity) and their quantitative relationships with PM_2.5 mass concentrations. The mean frequency of SBI in the morning in pollution months was 35.7% observed in Shanghai. The mean vertical temperature difference, depth and intensity of SBI were calculated as 3.7℃、118m and 3.6℃/100m respectively, presenting insignificant annual variability during the study period. Under the condition of SBI, the meteorology exhibited lower dispersion capacity with weaker surface wind speed (69%), lower ventilation index (18%~44%) and stronger stable stratification (Ri>0.25) compared with that under the condition of NTI, which was conductive to the local PM_2.5 accumulation. In addition, the lower temperature and higher relative humidity near surface further accelerated the heterogeneous reaction of secondary inorganic aerosols. As a result, the morning PM_2.5 mass concentration was 20%~107% higher than that under the condition of NTI during 2013~2019. The PM_2.5 mass concentration was positively correlated with vertical temperature difference and depth of SBI respectively, while showing insignificant relationship with intensity. The PM_2.5 mass concentration increased with the enhanced vertical temperature difference and depth respectively, both of them were well fitted as the quadratic equations (P<0.05). It was found that the PM_2.5 level alleviated quickly and exceeded 100μg/m³ when vertical temperature difference was greater than 4.6℃ or the inversion depth over 100m.

Key words： surface based inversion PM_2.5 pollution parameters of temperature inversion

Received: 02 July 2020

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	PAN Liang
	YAN Feng-xia
	WU Jun-shi
	ZHANG Yan-yan
	XU Jian-ming

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PAN Liang,YAN Feng-xia,WU Jun-shi等. Parameters of surface based inversion in the morning during 2013 to 2019 and its quantitative relationship with PM_2.5 in Shanghai[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 517-526.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/517

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