A Seasonal Climatology of the Mexico City Atmospheric Boundary Layer

摘要: Lower tropospheric thermal structure greatly affects atmospheric boundary-layer (ABL) stability and mixing processes with the free troposphere. In particular, in polluted urban zones, ABL stratification becomes a key variable air quality research. This study focuses on generating climatology (1990–2017) of seasonal variability Mexico City by way radiosonde analysis. Thermal inversion intensity frequency are shown to be greater during winter spring, behaviour which coincides pollutant concentrations. Higher concentrations found dry season (November May) than rainy months. addition, significantly higher normal surface days simple layers as well multilayer days. Furthermore, stable layers, determined potential temperature, throughout year but more frequently winter, whereas based virtual temperature prevail all year. regions complex terrain, such multiple have also been identified previous authors. Additionally, most unstable (in bulk Richardson number ( $${Ri}_{\mathrm {B}}$$ ) is small) develop season, there levels vertical column values. Although pollution episodes widely studied, this represents first long-term investigation consider ABL. Therefore, present provides baseline for further research employing different observational techniques high-resolution numerical models.