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Reflections on the threshold for PM2.5 explosive growth in the cumulative stage of winter heavy aerosol pollution episodes (HPEs) in Beijing Cover

Reflections on the threshold for PM2.5 explosive growth in the cumulative stage of winter heavy aerosol pollution episodes (HPEs) in Beijing

Tellus B: Chemical and Physical Meteorology
Volume 71 (2019): Issue 1
By: ,   and    
Open Access
|Jan 2019
Figures & tables

Figures & Tables

Fig. 1.

Temporal variations in PM2.5 mass concentration, surface radiation, and surface and vertical distributions of meteorological factors from 25 December 2017 to 1 January 2018 (a) PM2.5 mass concentration (gray or colored line: Beijing; light gray line: Baoding; gray dot: Shijiazhuang); (b) winds (vectors) and wind velocity (shadings; units: m/s); (c) temperature (shadings; units:°C); (d) RH (shadings; units: %); (e) direct (of the vertical surface to the direction of solar radiation) radiant exposure and global radiant exposure; (f, g, h, i) surface wind distribution in Beijing (the shading represents topography). (Green boxes or lines: the transport stage; blue boxes: relative strong southerly winds; red boxes or lines: the cumulative stage; white or gray boxes: the meteorological characteristics of the cumulative stage).

Table 1.

Characteristics of HPEs with the CS in winter (Jan., Feb, and Dec) from 2013 to 2017.

YearNo.HPEs with the CSDuration (d)PM2.5 peak value (μg m-3)Start time of CSsInitial PM2.5 concentration
(μg m-3)201319–14 Jan.67906:00, 12 Jan.126217–19 Jan.35359:00, 18 Jan.100.5311–14 Feb.432921:00, 12 Feb.159.25420–22 Feb.32566:00, 21 Feb.123523–28 Feb.649710:00, 23 Feb.43.290:00, 26 Feb.122.1265–8 Dec.44176:00, 6 Dec.151.67201471–3 Jan.318210:00, 2 Jan.70.8689–12 Jan.423911:00, 11 Jan.68.25928–30 Jan.31977:00, 29 Jan.69.51019–27 Feb.851314:00, 24 Feb.227.83118–10 Dec.330820:00, 8 Dec.97.712015122–5 Jan.428311:00, 3 Jan.124.25136–9 Jan.428812:00, 8 Jan.100.51411–16 Jan.64628:00, 15 Jan.226.881522–26 Jan.52615:00, 25 Jan.711612–16 Feb.43495:00, 14 Feb.189.621726 Nov.–1 Dec.664115:00, 29 Nov.183.751816–26 Dec.1162210:00, 22 Dec.157.519:00, 24 Dec.141.621927–30 Dec.449509:00, 29 Dec.223.7520162031 Dec. 2015–4 Jan.547709:00, 1 Jan.107211–5 Dec.54753:00, 3 Dec.159.622216–22 Dec.74668:00, 19 Dec.183.52329 Dec.–1 Jan. 201745519:00, 31 Dec.214.752017242 Jan.–8 Jan.757912:00, 3 Jan.247.252523–26 Jan.431813:00, 25 Jan.1502611–16 Feb62729:00, 14 Feb.149.882730 Nov.–3 Dec.42226:00, 2 Dec.292826–30 Dec.52237:00, 28 Dec.30
Fig. 2.

Mean profiles of temperature before the CS, during the earlier period in the CS, and during the later period in the CS respectively in all the 30 CSs.

Fig. 3.

Threshold values for PM2.5 explosive growth in all 30 CSs.

Fig. 4.

Threshold values for PM2.5 explosive growth during the CSs in lighter HPEs (left) and heavier HPEs (right) respectively.

DOI: https://doi.org/10.1080/16000889.2018.1528134 | Journal eISSN: 1600-0889
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Language: English
Page range: 1528134 - 1528134
Published on: Jan 1, 2019
Published by: Stockholm University Press
In partnership with: Paradigm Publishing Services
Keywords:
heavy aerosol pollution episodes,
cumulative stages,
PM2.5 explosive growth,
threshold value

© 2019 Junting Zhong, Xiaoye Zhang, Yaqiang Wang, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 71 (2019): Issue 1
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