Normally, temperature decreases with increase in elevation. It is called normal lapse rate. At times, the situations is reversed and the normal lapse rate is inverted. It is called Inversion of temperature. Inversion is usually of short duration but quite common nonetheless. A long winter night with clear skies and still air is ideal situation for inversion. The heat of the day is radiated off during the night, and by early morning hours, the earth is cooler than the air above. Over polar areas, temperature inversion is normal throughout the year.
Surface inversion promotes stability in the lower layers of the atmosphere. Smoke and dust particles get collected beneath the inversion layer and spread horizontally to fill the lower strata of the atmosphere. Dense fogs in mornings are common occurrences especially during winter season. This inversion commonly lasts for few hours until the sun comes up and beings to warm the earth.
The inversion takes place in hills and mountains due to air drainage. Cold air at the hills and mountains, produced during night, flows under the influence of gravity. Being heavy and dense, the cold air acts almost like water and moves down the slope to pile up deeply in pockets and valley bottoms with warm air above. This is called air drainage. It protects plants from frost damages.
Final Destination for Kerala PSC Notes and Tests, Exclusive coverage of KPSC Prelims and Mains Syllabus, Dedicated Staff and guidence for KPSC Kerala PSC Notes brings Prelims and Mains programs for Kerala PSC Prelims and Kerala PSC Mains Exam preparation. Various Programs initiated by Kerala PSC Notes are as follows:-- Kerala PSC Mains Tests and Notes Program
- Kerala PSC Prelims Exam 2020- Test Series and Notes Program
- Kerala PSC Prelims and Mains Tests Series and Notes Program
- Kerala PSC Detailed Complete Prelims Notes