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How air pressure change in Arctic is causing fog in Delhi
News
A new study of the Indian Institute of Tropical Meteorology (IITM), Pune, has found that widespread fog conditions over the Indo-Gangetic plains were connected to the abnormal movement of high pressure systems over the Arctic Circle and the Eurasian middle latitudes.
Important facts
- The study is based on analysis of 105 cases of fog events in the period between 1979 and 2013. The study period for the research was December and January months
- Mechanism:
- When an environment with lower air pressure surrounds the Arctic region, the cold air stays locked-up within the Arctic Circle
- The development of high air pressure over the Arctic Circle, combined with east-west movements of air circulation over Eurasia cause more cold air to advance towards the tropical latitudes and the Indo-Gangetic Plains
- It then allows development of high pressure and favours fog formation in the Indo-Gangetic Plains
