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Marine Cloud Brightening

  • Category
    Ecology and Environment
  • Published
    31st Oct, 2023

Context:

The concept of marine cloud brightening is gaining prominence recently as a tactic for addressing extreme ocean heat and as a way to reduce coral bleaching and safeguard marine ecosystems.

About

  • The concept of cloud brightening traces back to British cloud physicist John Latham, who proposed this idea in 1990 as a means to control global warming by altering the Earth's energy balance.
  • Latham's calculations suggested that brightening clouds over vulnerable ocean regions could counteract the warming caused by a doubling of pre- industrial atmospheric carbon dioxide.

Mechanism of Marine Cloud Brightening:

  • In clean maritime air, clouds primarily form from sulphates and sea salt crystals, which are relatively scarce, leading to larger droplets with lower light reflection.
  • Marine cloud brightening (MCB) seeks to boost marine cloud reflectivity (albedo), making clouds whiter and brighter.
  • It involves using water cannons or specialized vessels to release fine sea water droplets into the atmosphere.
  • As these droplets evaporate, they leave behind salt particles, serving as cloud condensation nuclei that foster the formation of denser, brighter clouds.

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