Содержание
- 2. Basic information The stratospheric ozone layer began to form soon after the onset of oxygen producing
- 4. Basic information A measure of the quantity of ozone in the air is the ozone column
- 5. UV portion of the solar spectrum is divided into far- and near-UV wavelengths
- 7. The chemistry of the natural ozone layer
- 8. The chemistry of the natural ozone layer (Ozone forms by)
- 9. The chemistry of the natural ozone layer (ozone is also destroyed by)
- 10. Chapman cycle Sidney Chapman (1888–1970)
- 11. Chapman cycle
- 13. Effects of Nitrogen on the Natural Ozone Layer Oxides of nitrogen [NO(g) and NO2(g)] naturally destroy
- 14. N2O(g) produces nitric oxide by
- 15. Nitric oxide naturally reduces ozone in the upper stratosphere by
- 16. Effects of Nitrogen on the Natural Ozone Layer This sequence is called a catalytic ozone destruction
- 17. Major loss processes are the formation of nitric acid and peroxynitric acid by the reactions
- 18. Effects of Hydrogen on the Natural Ozone Layer
- 19. Effects of Hydrogen on the Natural Ozone Layer The hydroxyl radical participates in an HOx(g) catalytic
- 20. The most effective ·HOx(g) cycle, which has a chain length in the lower stratosphere of 1
- 21. Effects of Hydrogen on the Natural Ozone Layer
- 22. Effects of Carbon on the Natural Ozone Layer (CO)
- 23. Effects of Carbon on the Natural Ozone Layer (CH4)
- 24. Changes on a Global Scale Between 1979 and 2000, the global stratospheric ozone column abundance decreased
- 25. CFCs and Related Compounds The compounds that play the most important role in reducing stratospheric ozone
- 26. CFCs and Related Compounds These compounds are non-flammable, tasteless and odourless, and chemically stable. Their other
- 28. CFCs and Related Compounds CFC 11 CFC 12
- 29. Atmospheric lifetimes and ozone depletion potentials of selected ozone-depleting gases
- 30. Other Chlorine Compounds Hydrochlorofluorocarbons (HCFCs) are another subset of chlorocarbons. The hydrogen atom allows HCFCs to
- 31. Bromine Compounds The primary source of stratospheric bromine is methyl bromide [CH3Br(g)], which is produced biogenically
- 32. Fluorine Compounds Compounds that contain hydrogen, fluorine, and carbon but not chlorine or bromine are hydrofluorocarbons
- 33. Lifetimes and Mixing Ratios of Chlorinated Compounds Once emitted, CFCs take about one year to mix
- 34. Lifetimes of CFCs Because the stratosphere is one large temperature inversion, vertical transport of ozone through
- 35. Lifetimes of CFCs In sum, the limiting factor in CFC decomposition in the stratosphere is not
- 36. Lifetimes of Non-CFCs Lifetimes of non-CFC chlorinated compounds are often shorter than are those of CFCs.
- 37. Lifetimes of Non-CFCs The benefit of a shorter lifetime for a chlorine-containing compounds is that, if
- 38. Emissions of Chlorine Compounds to the Stratosphere
- 39. Catalytic Ozone Destruction by Chlorine
- 40. Catalytic Ozone Destruction by Chlorine
- 41. Catalytic Ozone Destruction by Bromine
- 42. Catalytic Ozone Destruction by Bromine
- 44. Effects on Humans Increases in UV-B radiation have potential to affect the skin, eyes, immune system
- 45. Effects on Skin The severity of effects of UV-B radiation on skin depends on skin pigmentation.
- 46. Effects on Eyes With respect to the eye, the cornea, which covers the iris and the
- 47. Effects on the Immune System Enhanced UV-B radiation has been linked to suppression of these cells,
- 48. Effects on the Global Carbon and Nitrogen Cycles Changes in UV-B radiation affect the global carbon
- 49. Effects on Tropospheric Ozone Increases in UV-B radiation increase photolysis rates of UV-B absorbing gases, such
- 52. Arctic stratospheric ozone A great deal of scientific effort has gone into understanding the physical and
- 53. Total column ozone measurement stations Total column ozone levels have been measured for the past several
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