What is the Cause of Heavy Fog in North India | Indepth | Drishti IAS
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- เผยแพร่เมื่อ 10 ม.ค. 2024
- As winter tightened its grip on northern India, a thick blanket of fog descended on several states in the last days of 2023 and first of 2024, creating challenging conditions for residents and travellers alike. Some places in the country’s north reported low temperatures and dense fog for the last week of December. According to weather reports in late December 2023, minimum temperatures in Punjab, Haryana, and the northern reaches of Rajasthan and Uttar Pradesh hovered around 6-9 degrees C. In New Delhi, south Rajasthan, and north Madhya Pradesh, some places recorded minimum temperatures in the range of 10-12 degrees C, according to the India Meteorological Department (IMD). In the same time, most of North India also experienced a dense fog that reduced visibility in many areas to as little as 50 meters for several days. Haryana, including Chandigarh, plus isolated pockets of Uttarakhand, Uttar Pradesh, Bihar, Rajasthan, and Madhya Pradesh reported fog with visibility reduced to under 200 metres.In the same time, most of North India also experienced a dense fog that reduced visibility in many areas to as little as 50 meters for several days. Haryana, including Chandigarh, plus isolated pockets of Uttarakhand, Uttar Pradesh, Bihar, Rajasthan, and Madhya Pradesh reported fog with visibility reduced to under 200 metres.Other states including Jammu & Kashmir, Himachal Pradesh, Odisha, Chhattisgarh, Jharkhand, and Uttarakhand also reported fog for a few hours in the morning, the IMD reported. The fog that disrupted the lives of people in North India is a common weather phenomenon. A fog is a collection of small droplets of water produced when evaporated water has cooled down and condensed. According to Madhavan Nair Rajeevan, former director of the IMD and current Vice-Chancellor of Atria University, “Fog is nothing but a thick cloud, but very close to the earth’s surface. For a thick fog to form, temperatures should be lower and abundant moisture should be available near the surface. “Fog materializes whenever there is a temperature disparity between the ground and the air. This happens frequently during Indian winters: the fog is created when the temperature drops at night and in the early morning, condenses on aerosols present in the atmosphere. High humidity, combined with an ample presence of water vapour or moisture, encourages foggy conditions.
The process by which it cools plays a pivotal role in the formation of fog.
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