Factors influencing the boundary layer height and their relationship with air quality in the Sichuan Basin, China

Impacts of Nocturnal Cloud Top Radiative Cooling on Surface O3 in Sichuan Basin, Southwestern China

“…The elevated nocturnal surface O 3 concentrations are mainly attributed to meteorological processes due to a lack of photochemical reactions (Hu et al., 2012; Zhang & Rao, 1999; Zhang et al., 1998). The climate in SCB is characterized by low PBL height and weak winds due to the deep basin topography, resulting in a strong local accumulation of air pollutants in air pollution (Cao et al., 2020; Ning et al., 2018; L. Zhang et al., 2019). In our measured period, the near‐surface wind speed was no more than 3 m s –1 at two sites (Figure 1e), and the sea level pressure was uniformly distributed over SCB, indicating weak horizontal transport.…”

“…by emitting longwave radiation and cooling ambient air (Caughey & Kitchen, 1984;P. Duynkerke & Driedonks, 1987;P.…”

“…The elevated nocturnal surface O 3 concentrations are mainly attributed to meteorological processes due to a lack of photochemical reactions (Hu et al, 2012;Zhang & Rao, 1999;Zhang et al, 1998). The climate in SCB is characterized by low PBL height and weak winds due to the deep basin topography, resulting in a strong local accumulation of air pollutants in air pollution (Cao et al, 2020;Ning et al, 2018;L. Zhang et al, 2019).…”

A better understanding of air quality resulting from the effects of the 2020 pandemic in a city in the equatorial region (Fortaleza, Brazil)

“…The PBL is the part of the terrestrial atmosphere and contains the air that people breathe. It is also where the dispersion of air pollutants occurs, depending on weather conditions (Stewart 1979 ; Cao et al 2020 ). In the present study, the maximum boundary layer height (PBL max ) over the city of Fortaleza and its association with air quality were investigated.…”

“…According to the site, the boundary layer height is calculated based on the bulk Richardson number. Further information on this method can be found in Vogelezang and Holtslag ( 1996 ), Richardson et al ( 2013 ), Chandra et al ( 2014 ), and Cao et al ( 2020 ).…”