Extreme heat waves are on the rise in Indian sub-continent and have significant socio-economic impact. Explain its cause and suggest some measures to adapt and mitigate.
Answer: A heat wave is a period of abnormally high temperatures whereby maximum temperature should be at least 40°C for Plains and at least 30°C for Hilly regions. There has been rise in extreme heat waves in Indian subcontinent.
Fig: Mechanism of heat waves
Causes
- Absence ofwestern disturbances over northwest India
- Absence of periodic light rainfall and thundershowers.
- Absence of any significant pre-monsoon activity such as local rainfall.
- Presence of anti-cyclones which results in hot and dry weather.
- Climate change increasing frequency and intensity of heat waves.
Impact
- Heat waves have killed more than 17000 people ....
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