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Zorluk: OrtaClimate Change, Global Warming and Ozone Layer Depletion

Which of the following statements regarding the physical and chemical dynamics of global warming and atmospheric ozone are correct?

  1. Stratospheric ozone absorbs harmful ultraviolet-B (UV-BUV\text{-}B) radiation, preventing the majority of high-energy solar radiation from reaching the Earth's surface.Cevap
  2. B
    Carbon dioxide (CO2CO_2) possesses a significantly higher Global Warming Potential (GWPGWP) than methane (CH4CH_4) over a 100-year time horizon.
  3. Nitrous oxide (N2ON_2O) acts both as a greenhouse gas in the troposphere and as a major catalyst for ozone depletion in the stratosphere.Cevap
  4. D
    Tropospheric ozone acts primarily as a radiative cooling agent by scattering incoming shortwave solar rays back into space.

Cevap

The statements confirming that stratospheric ozone absorbs harmful UV-B radiation and that nitrous oxide acts as both a greenhouse gas and an ozone-depleting agent are correct.
The statement regarding stratospheric ozone is correct because the ozone layer shields the biosphere from harmful UV-B rays. The statement regarding nitrous oxide is also correct because N2O is both a powerful greenhouse gas in the troposphere and the single largest ozone-depleting substance emission in the 21st century.

Adım Adım Çözüm

1
Evaluate the statement concerning stratospheric ozone absorption
Stratospheric ozone absorbs high-energy solar UV-B radiation (280–315 nm280\text{--}315\text{ nm}), which is vital for preventing radiation damage on Earth.
This statement accurately reflects the protective role of ozone in the stratosphere.
2
Compare Global Warming Potentials of carbon dioxide and methane
CO2CO_2 is the reference gas with a GWP=1GWP = 1, whereas CH4CH_4 has a 100-year GWPGWP of around 28–3628\text{--}36.
The statement incorrectly claims CO2CO_2 has a higher GWPGWP than CH4CH_4.
3
Analyze the dual atmospheric impacts of nitrous oxide
N2ON_2O traps heat in the troposphere (GWP≈273GWP \approx 273) and decomposes into NOxNO_x radicals in the stratosphere, catalytically destroying O3O_3.
This statement correctly describes both the climate warming and ozone depletion effects of nitrous oxide.
4
Examine the radiative property of tropospheric ozone
Tropospheric ozone is a key greenhouse gas that absorbs outgoing longwave infrared radiation, warming the lower atmosphere.
The statement incorrectly describes tropospheric ozone as a cooling agent that scatters solar rays.

Anahtar Kavram

Dual roles of atmospheric gases in climate forcing and stratospheric ozone chemistry
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Konular

Climate Change, Global Warming and Ozone Layer Depletion