NASA tool predicts which cities will flood due to Global Warming

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National Aeronautics and Space Administration (Nasa) has developed a new forecasting tool that can predict which cities will be affected as different portions of ice sheets melt due to global warming.

How the tool works?

The tool looks at the Earth’s spin and gravitational effects to predict how water will be “redistributed” globally.

This provides, for each city, a picture of which glaciers, ice sheets, (and) ice caps are of specific importance.

Why this tool is needed?

  • As cities and countries attempt to build plans to mitigate flooding, they have to be thinking about 100 years in the future and they want to assess risk in the same way that insurance companies do.
  • This is the first time our method will enable planners and engineers to retrieve data about sea level in their area, and get updated numbers when new data about glacial melting becomes available

Key processes influenced “the sea-level fingerprint,” the pattern of sea-level change around the world

  • Gravity
  • Push-pull influence of ice
  • The rotation of the planet itself

Cities of India at higher risk

  • Mangalore in Karnataka is at a higher risk of flooding from rising sea levels because of melting glaciers than coastal cities such as Mumbai and New York, data released by Nasa shows.
  • Over the next 100 years, glacial melt could push up Mangalore sea levels by 15.98cm compared to 15.26cm for Mumbai.
  • The Indian subcontinent is likely to lose 14,000 sq km of land if sea level rises by a metre, according to some estimates.
  • In India, almost 40 million people will be at risk from sea-level rise by 2050

Issues due to sea level rise

  • Submergence of land
  • Thermal expansion of ocean waters. Water expands on heating and there has been a marked rise in average global temperatures of oceans since pre-industrial times.

 

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