اردو: Ozone Layer & UV Shield

اردو: Ozone Layer & UV Shield is a 3D atmospheric chemistry simulation of the stratospheric ozone column between 15 and 35 km altitude. Incoming solar radiation is separated into lethal UV-C (100 to 280 nm), sunburn-causing UV-B (280 to 315 nm), and low-energy UV-A (315 to 400 nm). Students watch triatomic ozone (O3) molecules split and recombine in the Chapman cycle to block 100% of UV-C and nearly all UV-B. Dragging or clicking chlorofluorocarbon (CFCl3) molecules releases reactive chlorine radicals (Cl and ClO) that catalytically strip oxygen atoms from ozone, dropping column thickness below the 220 Dobson Unit ozone-hole threshold and letting UV-B penetrate to the ground.

• اردو: Observe the three incoming wave beams at healthy ozone levels (~300 DU): purple UV-C stops high up, violet UV-B is blocked by O3, and amber UV-A passes through.
• اردو: Raise CFC emissions to 90% and set the Montreal Protocol year to 1995 to drop the ozone column below 220 Dobson Units and watch UV-B reach Earth.
• اردو: Click a green CFC molecule in the stratosphere to split off a reactive orange chlorine radical and watch it catalytically attack nearby O3 molecules.
• اردو: Slide the Montreal Protocol year forward from 2000 to 2065 to observe the gradual decay of stratospheric chlorine and recovery of the ozone shield.

1. 1اردو: Differentiate how the stratospheric ozone layer absorbs UV-C, UV-B, and UV-A solar radiation.
2. 2اردو: Describe how ozone is continuously created and destroyed by UV photons in the natural Chapman cycle.
3. 3اردو: Explain the catalytic mechanism by which a single chlorine radical from a CFC molecule destroys thousands of O3 molecules.
4. 4اردو: Interpret ozone column thickness in Dobson Units (DU) and evaluate the impact of the 1987 Montreal Protocol.

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