A new conceptual model for adiabatic fog

Abstract. Visibility reduction caused by fog can be hazardous for human activities, especially the transport sector. Previous studies show that this problem could mitigated improving nowcasting of dissipation. To address issue, we propose a new paradigm which potentially improve our understanding life cycle adiabatic continental fogs and conditions must take place For purpose, is defined as layer filled with suspended liquid water droplets, extending from an upper boundary all way down to surface, saturated temperature profile. In layer, path (LWP) exceed critical value: (CLWP). When LWP less than CLWP, amount not sufficient extend leading surface horizontal visibility greater 1 km. Conversely, when exceeds cloud enough reach inducing The excess respect value reservoir (RLWP). formulated conceptual model relates its thickness content allows paths computed. Both variables tracked in real time using vertical profiling measurements, enabling real-time diagnostic status. tested data 7 years measurements performed at SIRTA observatory, combining radar, microwave radiometer, ceilometer, scatterometer, weather station measurements. period found 80 events reliable 56 these lasting more 3 h. paper presents capability derive top height uncertainty 10.5 g m−2. impact variations on (formation dissipation) presented based four case statistics derived events. Our results, empirical parametrization adiabaticity, validate applicability model. calculated consistently positive during mature phase starts decrease quasi-monotonously about h before dissipation, reaching near-zero Hence, derivative used indicators stage, support