The SPF experiences a 9 month weakening period from January to September, which shifts to a strengthening period in October. 2b–c ). The frontogenesis and frontolysis processes of the subpolar front (SPF) in the surface mixed layer of the Japan Sea are investigated using state-of-the-art oceanic reanalysis data. The tendency of the ABFZ is estimated by Eq. B. Frontogenesis refers to a front weakening; frontolysis refers to a front strengthening. What is the difference between frontolysis and frontogenesis? A positive (negative) rate of frontogenesis indicates frontogenesis (frontolysis). Explain the difference between total and geostrophic frontogenesis, especially in the vicinity of any fronts. To check whether the difference in the MLD across the SST front influences the frontolysis effect of the net surface heat flux, we have estimated the ratio R H in equation 5 (Figures 2b and 2d). Frontogenesis is the intensification (and frontolysis is the relaxation) of the lateral buoyancy gradient at a front. Frontogenesis driven by the confluent barotropic with a drag coefficient of 1 10 8, which was chosen to flow dominates over frontolysis associated with the dif- be extremely small to minimize the Ekman flow in the fluent flow, resulting in a net strengthening of the zon- bottom boundary layer. To determine why the surface heat flux term strengthens the SST front, we examine the time-latitude plots of the mixed layer depth (MLD) and the net surface heat flux for the 145°E-150°E band (Fig. Frontolysis involves overriding of one of the air mass by another. The ratio R H is positive everywhere in 40°E–55°E and largest in 50°E–55°E, where it is about 0.8 in both the observation and the model. Frontogenesis involves convergence of two distinct air masses. The frontogenesis and frontolysis processes of the subpolar front (SPF) in the surface mixed layer of the Japan Sea are investigated using state‐of‐the‐art oceanic reanalysis data. In thi s module, an attempt is made to study the process of the formation of fronts, their A. Frontolysis refers to a front weakening; frontogenesis refers to a front strengthening. The difference between FRIC ν in the two domains attests to an asymmetry between the efficiency of PV injection and removal by up- and down-front winds. Opposite to frontogenesis, there is term called ‘frontolysis’ meaning the decaying of fronts. Corresponding to the annual cycle of the ABFZ, there is a seasonal cycle of frontogenesis and frontolysis in Fig. 8, most of this asymmetry is due to the fact that as up front winds restratify the fluid, the turbulent stress is confined to a depth shallower than the Ekman layer. Frontogenesis is a meteorological process of tightening of horizontal temperature gradients to produce fronts.In the end, two types of fronts form: cold fronts and warm fronts.A cold front is a narrow line where temperature decreases rapidly. (6). A warm front is a narrow line of warmer temperatures and essentially where much of the precipitation occurs. The process of formation of a front is known as Frontogenesis (war between two air masses), and dissipation of a front is known as Frontolysis (one of the air masses win against the other). 5a as the tendency of the ABFZ (green line): two maxima in frontogenesis in March–April and September–October and in frontolysis in May–June and December–February. 3 As shown in Fig. The figure was prepared with Kaleida Graph 4.0.