Temperature inversions in severe polluted days derived from radiosonde data in North China from 2011 to 2016

Xu, Tingting; Song, Yu; Liu, Mingxu; Cai, Xuhui; Zhang, Hongsheng; Guo, Jianping; Zhu, Tong

doi:10.1016/j.scitotenv.2018.08.088

Cited by 68 publications

(34 citation statements)

References 63 publications

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“…The coupling of the PBL and the surface is largely modulated by turbulent exchange processes, including the intensive vertical mixing of momentum, water, heat, and air pollution between surface and troposphere (Li et al, ; Luan et al, ; Mao et al, ; Zhu et al, ). The role of aerosol in modulating the evolution of PBL has been increasingly appreciated due to the considerable radiative effect (Guo, Deng, et al, ; Li et al, ; Patil et al, ; Wang et al, ; Xu et al, ; Zheng et al, ), especially the dome effect caused by the absorbing aerosol (e.g., black carbon) that tends to stabilize the PBL (Ding et al, ; Jiang et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…This region generally suffered severe air quality when both calm surface winds and stagnate air prevailed, which were favorable for the formation of fog and haze (Yang et al, ). Besides, the temperature inversion induced by light‐absorbing aerosol was able to impair the dispersion and transport of aerosol particles, especially in the North China Plain (NCP; Xu et al, ) and over central China (Liu et al, ). This inversion was strengthened by cool advection near surface and warm advection above the top of PBL, which in turn resulted in further deterioration of aerosol pollution (Miao, Guo, Liu, Liu, Li, et al, ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Relationship Between Aerosol and Boundary Layer Height in Summer in China Under Different Thermodynamic Conditions

Lou

Guo

Wang

et al. 2019

Earth and Space Science

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The observed relationships between boundary layer height (BLH) and PM2.5 on a national scale remain unclear due to the dearth of observations. Here we investigated this relationship from a unique perspective of thermodynamic stability in the planetary boundary layer (PBL), using summertime (June–August) soundings from China for the period from 2014 to 2017. For all three times of soundings (0800, 1400, and 2000 Beijing time [BJT]), positive (negative) PM2.5 concentrations anomalies were found to correlate with negative (positive) BLHs anomalies relative to daily means. The negative correlation was strongest at 1400 BJT, followed by 2000 BJT and 0800 BJT. Overall, the PM2.5 was found to nonuniformly anticorrelate with BLH across China at 0800 and 2000 BJT. The strongest anticorrelation occurred in the North China Plain at 1400 BJT, in sharp contrast to the much weaker correlation in other regions characterized by much less polluted regions. The averaged PM2.5 in neutral boundary layers was higher than that in convective boundary layers (CBLs). The CBL, where the anticorrelation was the strongest, was conducive to dissipating more aerosol in the heavily polluted area in China than neutral boundary layer. The higher CBL formed under low cloud cover, low surface humidity, and strong wind speed was favorable for the dispersion of aerosol, in contrast to the stable boundary layers that happen under the highest cloud cover. Also, positive correlation was seen between stable boundary layer and PM2.5. The findings call for attention that the thermodynamical condition of PBL should be considered when examining the aerosol‐PBL interactions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Relationship Between Aerosol and Boundary Layer Height in Summer in China Under Different Thermodynamic Conditions

Lou

Guo

Wang

et al. 2019

Earth and Space Science

Self Cite

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“…For instance, Xu et al . () highlighted that 93% of the severely polluted days in Beijing were accompanied either by surface‐based or low‐level elevated inversions. Apart from trapping the air pollutants near to the Earth's surface, the temperature inversions provide also a moist environment favourable to chemical reactions in the liquid and heterogeneous phase that benefit the production of new secondary aerosols causing the air pollution episodes to be more severe (Silva et al ., ).…”

Section: Introductionmentioning

confidence: 99%

“…Many previous studies, such as Malek et al (2006), Largeron and Staquet (2016), Palarz and Celi nski-Mysław (2017), and Hu et al (2018), have shown evidence that severe air pollution episodes are attributed rather to unfavourable weather conditions, mainly the long-term persistence of isothermal and inversion layers, than to a sudden increase in the emission of air pollutants. For instance, Xu et al (2019) highlighted that 93% of the severely polluted days in Beijing were accompanied either by surface-based or low-level elevated inversions. Apart from trapping the air pollutants near to the Earth's surface, the temperature inversions provide also a moist environment favourable to chemical reactions in the liquid and heterogeneous phase that benefit the production of new secondary aerosols causing the air pollution episodes to be more severe (Silva et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial variability of elevated inversions over Europe based on ERA‐Interim reanalysis

Palarz

Celiński‐Mysław

Ustrnul

2019

Intl Journal of Climatology

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Tropospheric temperature inversions are thought to be an important feature of climate as well as a significant factor affecting air quality and low‐level cloud formation. The aim of this study is to investigate the temporal and spatial variability of the tropospheric temperature inversions, in particular so‐called elevated inversions, over Europe. The analysis is based on data gained from ERA‐Interim reanalysis for the period 1981–2015. The data consist of air temperature, and geopotential height from the entire vertical cross‐section of the troposphere, that is, from 1,000 to 100 hPa. The study examines the temporal (intra‐ and inter‐annual) variability of the temperature inversions based on their frequency, base height, depth, and strength. The analysis conducted revealed that the temperature inversions are a common phenomenon occurring in the lower troposphere. Their temporal and spatial variability is, however, determined by the inversion type. Surface‐based inversions (SBI) indicate a clear diurnal cycle, while the day–night variability of elevated inversions (EI) is far less pronounced. Two main regions of the most frequent EI occurrence may be distinguished. These are: (a) a marine area west of the Iberian Peninsula and (b) Eastern Europe. Both of them are located in areas which are under the influence of extensive high‐pressure systems—the permanent Azores High and semipermanent Siberian High, respectively. The development of EI should be therefore attributed to the large‐scale subsidence and adiabatic heating of air parcels. EI are also quite common over the other parts of the Atlantic Ocean, which is closely linked to the development of marine inversions. SBI tend to be stronger than EI—the mean seasonal inversion strength is usually substantially higher for SBI. In turn, EI reach higher values of the mean seasonal inversion depth as compared with SBI.

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“…It is noted that atmospheric dispersion capacity is substantially modulated by synoptic patterns and hence the evolutions of large-scale synoptic systems can lead to the improvement or deterioration of air quality (Yarnal, 1993;Miao et al, 2017;Ning et al, 2019;Dong et al, 2020;Ning et al, 2020). In China, high anthropogenic emissions from coal-fired heating (Xiao et al, 2015), frequent temperature inversion (Xu et al, 2019;Feng et al, 2020;Guo et al, 2020), and shallow planetary boundary layer (PBL) structure (Li et al, 2017;Miao et al, 2018;Su et al, 2020) result in frequent occurrence of heavy air pollution events in winter. These factors highlight the significance of further revealing the physical mechanism of atmospheric dispersion evolutions.…”

Section: Introductionmentioning

confidence: 99%

Clustering diurnal cycles of day-to-day temperature change to understand their impacts on air quality forecasting in mountain-basin areas

Kong

Wang

Ning

et al. 2021

Preprint

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Abstract. Air pollution is substantially modulated by meteorological conditions, and especially their diurnal variations may play a key role in air quality evolution. However, the behaviors of temperature diurnal cycles along with the associated atmospheric condition and their effects on air quality in China remain poorly understood. Here, for the first time we examine the diurnal cycles of day-to-day temperature change and reveal their impacts on winter air quality forecasting in mountain-basin areas. Three different diurnal cycles of the preceding day-to-day temperature change are identified and exhibit notably distinct effects on the day-to-day changes in atmospheric dispersion conditions and air quality. The diurnal cycle with increasing temperature obviously enhances the atmospheric stability in the lower troposphere and suppresses the development of the planetary boundary layer, thus deteriorating the air quality on the following day. By contrast, the diurnal cycle with decreasing temperature in the morning is accompanied by a worse dispersion condition with more stable atmosphere stratification and weaker surface wind speed, thereby substantially worsening the air quality. Conversely, the diurnal cycle with decreasing temperature in the afternoon seems to improve air quality on the following day by enhancing the atmospheric dispersion conditions on the following day. The findings reported here are critical to improve the understanding of air pollution in mountain-basin areas and exhibit promising potential for air quality forecasting.

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Temperature inversions in severe polluted days derived from radiosonde data in North China from 2011 to 2016

Cited by 68 publications

References 63 publications

On the Relationship Between Aerosol and Boundary Layer Height in Summer in China Under Different Thermodynamic Conditions

On the Relationship Between Aerosol and Boundary Layer Height in Summer in China Under Different Thermodynamic Conditions

Temporal and spatial variability of elevated inversions over Europe based on ERA‐Interim reanalysis

Clustering diurnal cycles of day-to-day temperature change to understand their impacts on air quality forecasting in mountain-basin areas

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