Observational Analyses of Nocturnal Temperature Inversions in Haean Basin

In this research we analyzed nocturnal temperature inversions in Haean Basin. Inversions are important phenomena for understanding meteorological and hydrological character of the basin region. Three automatic weather station data and tethered balloon soundings were used to analyze inversion strength, depth, and occurrence of inversions. Stronger and deep inversion was found during early summer while weaker but frequent inversions occurred during late September and early October. A significant influence of fog layer was found. The fog layer acts as a break during a cooling process. The fog appears usually in early mornings. During our experiment, average potential temperature change at the surface was -1.08 K/h without fog presence. When the fog appeared six hours average decreased to -0.23K/h. The most deep and strongest inversion of the studied period was 0.19 °C/m temperature gradient.