1.       What is ozone hole? What are its consequences?

Asked by shahishrishti | 6th Sep, 2014, 06:19: PM

Expert Answer:

Ozone hole:

  • It is a loss of stratospheric ozone in springtime over Antarctica, peaking in September.
  • It is defined as the size of the region with total ozone below 220 Dobson units (DU).
  • Dobson Units are a unit of measurement that refer to the thickness of the ozone layer in a vertical column from the surface to the top of the atmosphere.
  • Prior to 1979, total column ozone values over Antarctica never fell below 220 DU.
  • The hole is a result of human activities--the release of huge quantities of chlorofluorocarbons (CFCs) and other ozone depleting substances into the atmosphere.

Consequences of ozone depletion in the stratosphere:

  • For every 1% decrease in the stratospheric ozone the biologically active uv radiation will increase by 1.3%. The adverse effects of uv radiations are:
  • Cataract can be developed resulting in blurred vision and without treatment, blindness.
  • Exposure can  lead to accelerate ageing, wrinkling and various forms of cancer.
  • Interference with photosynthesis could result in lower yields.
  • Radiation affects the growth of phytoplankton, the mainstay of ocean food chain.

Answered by Vaibhav Chavan | 8th Sep, 2014, 11:18: AM