Which one of the following can be said to be essentially related to ‘Polar Front Theory’?

The 'Polar Front Theory', also known as the Norwegian model or Bergen theory, was propounded by Vilhelm Bjerknes and Jakob Bjerknes to explain the origin and development of temperate cyclones [3]. According to this theory, temperate cyclones (also called mid-latitude or extra-tropical cyclones) form along the polar front, which is a boundary separating cold polar air masses from warm tropical air masses [2]. The interaction between these contrasting air masses under the influence of the Coriolis force leads to frontal cyclogenesis [3]. Unlike tropical cyclones, which have a thermal origin and lack fronts, temperate cyclones have a dynamic origin and are essentially frontal in nature [3]. The theory describes the life cycle of these systems from frontogenesis to occlusion [2]. Therefore, the Polar Front Theory is essentially related to temperate cyclones, which dominate the weather patterns of the mid-latitudes [3].

Sources

1. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 28: Temperate Cyclones > 28. Temperate Cyclones > p. 395
2. [1] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 9: Atmospheric Circulation and Weather Systems > Extra Tropical Cyclones > p. 82
3. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 28: Temperate Cyclones > 28.2. Fronts > p. 398