Characteristics of Low-level jets during 2015–2016 and the effect on fog in Tianjin

Wu, Bingui; Li, Zongfei; Ju, Tingting; Zhang, Hongsheng

doi:10.1016/j.atmosres.2020.105102

Cited by 14 publications

(9 citation statements)

References 81 publications

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“…Wind profiler observations in several metropolises (e.g., Beijing, Tianjin, Shanghai, and Guangzhou) have provided additional information on local LLJ characteristics, such as diurnal LLJ variation and the processes involved in their continuous evolution, which favors further analysis of the LLJ mechanisms (Du et al., 2012; Miao et al., 2018; Wei et al., 2014). The influence of LLJs on the ABL processes has also been concerned, such as their impacts on fog (Wu et al., 2020), dust emission over the arid areas (Ge et al., 2016), and pollutant transport (Miao et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Low‐Level Jet Climatology of China Derived From Long‐Term Radiosonde Observations

et al. 2021

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The low-level jet (LLJ) is an important atmospheric phenomenon, defined as a local wind speed maximum typically observed within the lowest few kilometers of the troposphere (Bonner, 1968;Stull, 1988). Its interaction with the air layer below can significantly influence the atmospheric boundary layer (ABL) structure and turbulence, thereby modifying the vertical transport/exchange of momentum, heat, moisture, and pollutants, between the atmosphere and the Earth's surface (Garratt, 1985(Garratt, , 1994Stull, 1988). With strong wind speed and wind shear at a relatively lower height to the earth, LLJs are closely related to aviation safety (

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Section: Introductionmentioning

confidence: 99%

Low‐Level Jet Climatology of China Derived From Long‐Term Radiosonde Observations

et al. 2021

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“…The LLJs are primarily a process in the ABL and are highly relevant in many fields, such as wind energy (Wimhurst and Greene, 2019), precipitation (Du et al, 2012), fog (Wu et al, 2020), urban heat islands (Hu et al, 2013a), wildfires (Čavlina Tomašević et al, 2022), aviation safety (Gultepe et al, 2019), and migration pathways of birds (Wainwright et al, 2016). This review aimed to examine how the LLJs impact pollutant transport locally and inter-regionally, considering mineral dust, fine particulate matter (PM 2.5 ), and ozone (O 3 ).…”

Section: Open Access Edited Bymentioning

confidence: 99%

Low-level jets and their implications on air pollution: A review

Wei

Zhang

et al. 2023

Front. Environ. Sci.

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Low-level jets (LLJ) are a common phenomenon in the atmospheric boundary layer and have been reported worldwide. Additionally, they have considerable relevance in a series of fields. This review aimed to document their implications on air quality, specifically particulate matter, mineral dust, and ozone in recent literature focus on i) generalizing long-range advection of pollutants by the low-level jets; ii) analysing vertical transport due to low-level jets-enhanced turbulence mixing and the corresponding mechanisms for different pollutants; and iii) introducing the performance of state-of-the-art numerical models. Finally, we suggest that high-resolution spatiotemporal observations of the pollutants and turbulence must be conducted, and current parameterization schemes should be improved to better represent the low-level jets and nocturnal boundary layer structures for reproducing the complicated interactions between the low-level jets and pollutants.

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“…To obtain the boundary-layer wind-profile data, the radar wind-profile radar located at Xiqing station, which operates at a frequency of 1363 MHz with three observation models, is used. The detailed descriptions of the wind-profile radar characteristics are shown in Table 1 in Wu et al (2020).…”

Section: Experiments Site and Datamentioning

confidence: 99%

“…Some potential causes of intermittent turbulence in the SBL that have been documented include gravity waves (Sorbjan and Czerwinska, 2013), solitary waves (Terradellas et al 2005), horizontal meandering of the mean wind field (Anfossi et al 2005), and low-level jets (LLJs, Marht 2014; Wei et al 2018). Based on criteria for LLJs in Tianjin documented in previous studies (Wei et al 2014;Wu et al 2020), simplified criteria, the maximum wind speed (V max ) ≥ 6 m s −1 , and the difference between V max and the minimum wind speed above or the wind speed at the height of 3 km ≥ 3 m s −1 , were used. Intermittent turbulence in the early morning of 13 November was induced by wind shear associated with a nocturnal LLJ (Fig.…”

Section: Characteristics Of Boundary-layer Structure and Turbulence D...mentioning

confidence: 99%

Impacts of Boundary-Layer Structure and Turbulence on the Variations of PM2.5 During Fog–Haze Episodes

Zhang

et al. 2022

Boundary-Layer Meteorol

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The precise cause of PM2.5 (fine particular matter with a diameter smaller than 2.5 μm) explosive growth and the contribution of intermittent turbulence to the dispersion of PM2.5 are uncertain. Thus, the impact of boundary-layer structure and turbulence on the variations of surface PM2.5 during fog–haze episodes, especially during explosive growth and dispersion episodes, are investigated using turbulence data collected at a 255-m high meteorological tower in Tianjin from 2016 to 2018. Results suggest that the explosive growth of surface PM2.5 during fog–haze episodes is closely related to weak turbulent mixing, nocturnal inversions, or anomalous inversions, and the barrier effect of strong turbulent intermittency. Turbulent intermittency acts as a lid for hindering pollutant dispersion and is favourable for the fast accumulation of surface PM2.5. Apart from the potential causes mentioned above, the persistent moderate south-westerly flow is also a contributing factor for the explosive growth of surface PM2.5 during fog–haze episodes associated with regional transport. In addition, we demonstrate a possible mechanism of how intermittent turbulence affects the dispersion of PM2.5. Results verify that intermittent turbulence induced by the nocturnal low-level jet (LLJ) indeed plays an important role in the dispersion of PM2.5. However, the contribution of intermittent turbulence generated by the nocturnal LLJ to the dispersion of PM2.5 strongly relies on the intensity of the nocturnal LLJ.

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Characteristics of Low-level jets during 2015–2016 and the effect on fog in Tianjin

Cited by 14 publications

References 81 publications

Low‐Level Jet Climatology of China Derived From Long‐Term Radiosonde Observations

Low‐Level Jet Climatology of China Derived From Long‐Term Radiosonde Observations

Low-level jets and their implications on air pollution: A review

Impacts of Boundary-Layer Structure and Turbulence on the Variations of PM2.5 During Fog–Haze Episodes

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