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North Indian Ocean Cyclones Rapidly Intensifying
29 Oct
Summary
- Nearly 38% of North Indian Ocean cyclones intensified rapidly since 2000.
- Warmer sea-surface temperatures provide energy and moisture for storms.
- Economic impact of cyclones extends beyond damage, affecting informal workers.
A worrying trend of rapid intensification in North Indian Ocean cyclones has been highlighted by scientists, with approximately 38% of these storms experiencing sharp increases in wind speed since 2000. This rate is significantly higher than the 22% observed in the northwest Pacific. Cyclone Arnab, which recently made landfall, is a prime example, transforming from a tropical depression to a very severe cyclonic storm within 36 hours.
Scientists attribute this intensification to the combined influence of warmer sea-surface temperatures and heat stored beneath the ocean, which provide essential energy and moisture for storm development. Factors such as El Nino and an eastward shift in cyclone formation over the Bay of Bengal may also play a role, allowing storms to travel over warmer waters for longer durations.
While global warming doesn't cause El Nino, it exacerbates its effects by adding extra heat. This background warming intensifies extreme weather events, leading to storms with greater potential for intense rainfall. However, determining the precise contribution of climate change or El Nino to any single storm requires separate attribution analysis.
The economic consequences of cyclones extend far beyond direct physical destruction. The cascading disruption affects informal workers, small businesses, and farmers, many of whom lack insurance. This underscores the urgent need for stronger infrastructure and improved climate-risk mapping to mitigate broader societal impacts.
