Bengal port records country’s highest sea level rise in 50 years

Mains Paper 1 : Climatic Change |

Note4Students

From UPSC perspective, the following things are important :

Prelims level : Not Much

Mains level : Sea level rise and global warming


News

  • Of the major ports in India, Diamond Harbour in West Bengal located at the mouth of river Hooghly has recorded the maximum sea level increase.

Freaky rise in Sea Levels

  • Going by the data from the Ministry of Earth Sciences, four ports — Diamond Harbour, Kandla, Haldia and Port Blair — recorded a higher sea level rise than the global average.
  • Chennai and Mumbai, recorded a sea level rise far below the global and the national averages at 0.33 mm per year (1916-2005) and 0.74 mm (1878-2005) respectively.
  • Sea level rise in the country has been estimated to be 1.3 mm/year along India’s coasts during the last 40-50 years, at Diamond Harbour the rise was almost five times higher at 5.16 mm per year.
  • The mean sea level rise for Diamond Harbour was based on recordings over the period from 1948 to 2005.
  • This is followed by Kandla port in Gujarat where the sea level rise was 3.18 (1950 to 2005) , followed by Haldia in West Bengal, which recorded a sea level rise of 2.89 mm a year (1972 to 2005).
  • Port Blair also recorded a sea level rise of 2.20 mm per year (1916-1964).

Why rise in sea level?

  • Sea level rise is said be linked with global warming and as per the fifth assessment report of the International Panel on Climate Change.
  • The global sea level was rising at an average rate of 1.8 mm per year over the last century.
  • Global warming not only causes melting of ice and glaciers, but also leads to internal expansion of water in oceans and thus a rise in the sea level.
  • Heavy rainfall and temperature extremes like heat waves and shifts in semi-arid regions were some of the recent findings which may have linkages with climate change and global warming.
  • Studies over Indian region have shown a warming trend of 0.6°C on all India average basis, mainly contributed by maximum temperatures.
  • The sea level rise is higher in West Bengal, particularly in the Sunderbans delta is because of the deltaic sediment deposition as a result of the mixing of fresh water and saline water, according to experts.

Threats

  • Rising sea levels can exacerbate the impacts of coastal hazards such as storm surge, tsunami, coastal floods, high waves and coastal erosion in the low lying coastal areas.
  • In addition it causes gradual loss of coastal land to sea.
Climate Change Impact on India and World – International Reports, Key Observations, etc.
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