Interaction Between Planetary Boundary Layer and PM2.5 Pollution in Megacities in China: a Review

Miao, Yucong; Li, Jing; Miao, Shiguang; Che, Huizheng; Wang, Yaqiang; Zhang, Xiaoye; Zhu, Rong; Liu, Shuhua

doi:10.1007/s40726-019-00124-5

Cited by 112 publications

(50 citation statements)

References 106 publications

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“…In addition to the large-scale warm/cold advections, the suspended aerosols may also modify the PBL structure to some extent 165 (Miao et al, 2019a;Zhong et al, 2018). As shown in Fig.…”

Section: Impact Of Aerosol Radiative Effect On the Pbl Structure And mentioning

confidence: 99%

“…The fate of emitted pollutants is largely governed by the planetary boundary layer (PBL) (Garratt, 1994;Miao and Liu, 2019;30 Oke, 2002;Stull, 1988), which is the region of the lower troposphere and strongly influenced by the surface. The PBL acts as changeable coupling agents that modulate momentum, heat, moister, and matter between the surface and free troposphere (Baklanov et al, 2011;Miao et al, 2019a;Stull, 1988). In the vertical dimension, the intensity of thermal buoyancy is controlled by the thermal stratification, and the strength of mechanical turbulence is determined by the surface roughness and the PBL wind.…”

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confidence: 99%

“…In the vertical dimension, the intensity of thermal buoyancy is controlled by the thermal stratification, and the strength of mechanical turbulence is determined by the surface roughness and the PBL wind. Together these thermal and mechanical PBL processes determine the vertical dispersion and dilution of 35 pollutants and the air replacing from upper levels (Miao et al, 2019a;Oke, 2002;Stull, 1988). Thereby, the depth of PBL, also known as the boundary layer height (BLH), has been extensively utilized to characterize the atmospheric environmental capacity and the dilution volume of pollutants (Stull, 1988;Seidel et al, 2010;Hu et al, 2014;Miao et al, 2015).…”

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confidence: 99%

“…Due 45 to the blocking effects of mountains, the momentum exchanging processes between the PBL and the upper free troposphere could be repressed dynamically (Miao et al, 2018;Wang et al, 2018b). Moreover, the local thermal gradient between the mountains-and-plains or land-and-sea can bring on closed circulation systems, and modify the near-surface winds and thermal inversion intensity, leading to the re-circulation and accumulation of pollutants (Chen et al, 2009;Miao et al, 2015Miao et al, , 2017bMiao et al, , 2019a. 50…”

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confidence: 99%

“…On the other hand, during the heavy pollution events, the black carbon can cause the upper layer of PBL to be relatively warm (Ding et al, 2016), and the massive aerosols can intensify the PBL stability through scattering the solar radiations, leading to lower the BLH and deteriorate the pollution (Miao et al, 2019a;Quan et al, 2013;Sun et al, 2019;Wang et al, 2019;Zhong https://doi.org/10.5194/acp-2019-1011 , 2017, 2018). For instance, the unfavorable PBL meteorology and the feedback of aerosol together, were found to be responsible for ~84% of the explosive growth of PM 2.5 concentration in Beijing during December 2016 (Zhong et al, 2017).…”

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confidence: 99%

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Integrated impacts of synoptic forcing and aerosol radiative effect on boundary layer and pollution in the Beijing-Tianjin-Hebei region, China

Miao¹,

Che²,

Zhang³

et al. 2019

Preprint

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Rapid urbanization and industrialization have led to deterioration of air quality in the Beijing-Tianjin-Hebei (BTH) region with high loadings of PM 2.5 . The heavy aerosol pollutions frequently occur in winter, closely in relation to the 10 meteorological conditions. To unravel the complicated impacts of large-scale atmospheric forcing and the local-scale planetary boundary layer (PBL) characteristics on the pollution there, this study combined long-term observational data analyses, synoptic pattern classification, and meteorology-chemistry coupled simulations. During the winter of 2017 and 2018, Beijing, Langfang, Tianjin, and Tangshan often simultaneously experienced heavy PM 2.5 pollution, accompanying with strong thermal inversion aloft. These concurrences of pollution in different cities were primarily regulated by the large-scale atmospheric 15processes. Using the principal component analysis with the geopotential height fields at the 850-hPa level during winter, the typical polluted synoptic pattern in BTH was identified. The pattern was featured by westerly winds from upstream mountainous regions. By inducing warm advections from the west, the thermal inversion aloft in the BTH could be enhanced, leading to shallow daytime PBLs and high near-surface PM 2.5 concentrations. In addition, the aerosol may also modulate the PBL structure through its radiative effect, which was examined using numerical simulations. The aerosol radiative effect can 20 significantly lower the boundary layer height in the afternoon through cooling the surface layer and heating the upper part of PBL. Thus, more aerosols could be accumulated in the lower portion of PBL, bringing about heavy pollution in the BTH. This study has revealed the important roles played by the meteorology-aerosol interaction on the air quality.

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“…In addition to the large-scale warm/cold advections, the suspended aerosols may also modify the PBL structure to some extent 165 (Miao et al, 2019a;Zhong et al, 2018). As shown in Fig.…”

Section: Impact Of Aerosol Radiative Effect On the Pbl Structure And mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Integrated impacts of synoptic forcing and aerosol radiative effect on boundary layer and pollution in the Beijing-Tianjin-Hebei region, China

Miao¹,

Che²,

Zhang³

et al. 2019

Preprint

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Planetary boundary layer climatological features over North China Plain: Derived from intensive experiment data

Yan

Jin

et al. 2023

Intl Journal of Climatology

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A field campaign was carried out in the North China Plain (NCP) spanning 4 years and formed a dataset of more than 2,700 planetary boundary layer (PBL) sounding samples (872 in summer and 1,841 in winter). Based on these data, fundamental aspects of the PBL climatology over this region were investigated. First, the ensemble mean features of the PBL were revealed. The maximum PBL height in the daytime reaches 1,079 versus 786 m (summer vs. winter, hereafter the same), while about 200 m at nighttime. The bulk mean temperature and specific humidity across the PBL in summer are significantly higher than those in winter (24.0 vs. −0.5°C; 8.9 vs. 1.7 g⋅kg−1, respectively). Mean wind speed within the PBL keeps almost the same in winter and summer (4.5 m⋅s−1) but with a seasonal difference in wind direction (southerly vs. northwesterly). Second, significant diurnal variations within/above the PBL were quantified. Day‐night temperature contrast is largest near the ground (7.9 vs. 5.1°C), and it decreases with height to almost a constant above the PBL. Diurnal variation amplitude of specific humidity is about 1.0 versus 0.3 g⋅kg−1. Diurnal variation of winds also supports the extended influence of the earth surface across the PBL. Third, the local influence on the PBL over the NCP is also presented. PBL height is higher in the plain centre; temperature is lower in coast than inland; winds in the PBL are strongly modulated by local or mesoscale circulations including the plain wind and sea breeze; low‐level jets are common at summer night over the central and eastern parts of the NCP. Analysis reveals possible energy and water vapour exchange across the PBL, and additional heating mechanism above the PBL (e.g., solar radiation absorption).

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A New Index Developed for Fast Diagnosis of Meteorological Roles in Ground-Level Ozone Variations

et al. 2022

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China experienced worsening ground-level ozone (O 3 ) pollution from 2013 to 2019. In this study, meteorological parameters, including surface temperature (T 2 ), solar radiation (SW), and wind speed (WS), were classified into two aspects, (1) Photochemical Reaction Condition (PRC = T 2 × SW) and ( 2) Physical Dispersion Capacity (PDC = WS). In this way, a Meteorology Synthetic Index (MSI = PRC/PDC) was developed for the quantification of meteorology-induced ground-level O 3 pollution. The positive linear relationship between the 90th percentile of MDA8 (maximum daily 8-h average) O 3 concentration and MSI determined that the contribution of meteorological changes to ground-level O 3 varied on a latitudinal gradient, decreasing from ~40% in southern China to 10%-20% in northern China. Favorable photochemical reaction conditions were more important for ground-level O 3 pollution. This study proposes a universally applicable index for fast diagnosis of meteorological roles in ground-level O 3 variability, which enables the assessment of the observed effects of precursor emissions reductions that can be used for designing future control policies.

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Interaction Between Planetary Boundary Layer and PM2.5 Pollution in Megacities in China: a Review

Cited by 112 publications

References 106 publications

Integrated impacts of synoptic forcing and aerosol radiative effect on boundary layer and pollution in the Beijing-Tianjin-Hebei region, China

Integrated impacts of synoptic forcing and aerosol radiative effect on boundary layer and pollution in the Beijing-Tianjin-Hebei region, China

Planetary boundary layer climatological features over North China Plain: Derived from intensive experiment data

A New Index Developed for Fast Diagnosis of Meteorological Roles in Ground-Level Ozone Variations

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