Examkin

Soru

Zorluk: OrtaClimate Change, Global Warming and Ozone Layer Depletion

Match the atmospheric gases and pollutants listed in List-I with their primary environmental characteristic or atmospheric behavior described in List-II:

  • Sulfur Hexafluoride (SF6SF_6)Synthetic greenhouse gas with the highest 100-year Global Warming Potential (GWP100≈23,500GWP_{100} \approx 23,500) evaluated by IPCC
  • Nitrous Oxide (N2ON_2O)Dominant currently emitted anthropogenic substance responsible for stratospheric ozone depletion via reactive nitrogen radicals
  • Hydrochlorofluorocarbons (HCFCs)Transitional ozone-depleting compounds containing hydrogen, used as temporary substitutes for CFCs under the Montreal Protocol
  • Methane (CH4CH_4)Short-lived climate pollutant whose primary atmospheric destruction path is oxidation by hydroxyl radicals (OH∙\text{OH}^\bullet) in the troposphere

Cevap

Sulfur Hexafluoride (SF6SF_6) matches with the synthetic greenhouse gas exhibiting the highest 100-year GWP (~23,500); Nitrous Oxide (N2ON_2O) matches with the dominant current anthropogenic ozone-depleting emission; Hydrochlorofluorocarbons (HCFCs) match with the transitional ozone-depleting substitutes containing hydrogen; and Methane (CH4CH_4) matches with the short-lived climate pollutant primarily removed via hydroxyl radical (OH∙\text{OH}^\bullet) oxidation.
Each atmospheric gas is correctly paired with its specific radiative, chemical, or policy characteristic. Sulfur Hexafluoride holds the highest 100-year GWP among regulated greenhouse gases. Nitrous Oxide is the largest remaining unregulated anthropogenic contributor to stratospheric ozone depletion. HCFCs serve as hydrogen-containing transitional ODSs under phase-out. Methane is a short-lived climate pollutant mainly removed via tropospheric hydroxyl radical (OH∙\text{OH}^\bullet) oxidation.

Adım Adım Çözüm

1
Identify the primary radiative property of Sulfur Hexafluoride (SF6SF_6).
SF6SF_6 is recognized by the IPCC as having an exceptionally high Global Warming Potential (GWP100≈23,500GWP_{100} \approx 23,500) due to its long atmospheric lifetime (~3,200 years) and intense infrared absorption cross-section.
This establishes the match for Sulfur Hexafluoride.
2
Analyze the atmospheric chemistry impact of Nitrous Oxide (N2ON_2O).
Agricultural and industrial emissions of N2ON_2O photolyze in the stratosphere to yield NONO radicals that catalyze ozone destruction. Because it is not regulated by the Montreal Protocol, it is currently the leading anthropogenic ozone-depleting substance emitted.
This links Nitrous Oxide to its status as the top remaining anthropogenic ODS emitter.
3
Examine the regulatory role of HCFCs in ozone protection policy.
HCFCs were introduced as first-generation temporary replacements for CFCs. Their C-H bonds allow partial degradation in the troposphere, reducing their Ozone Depletion Potential compared to CFCs, though they remain subject to global phase-out.
This confirms HCFCs as transitional compounds under the Montreal Protocol.
4
Determine the main removal sink for atmospheric Methane (CH4CH_4).
Methane has an atmospheric lifetime of about 11.8 years. Its dominant atmospheric sink is oxidation by the hydroxyl radical (OH∙\text{OH}^\bullet) in the troposphere, forming water vapor and carbon dioxide.
This pairs Methane with oxidation by hydroxyl radicals.

Anahtar Kavram

Atmospheric behavior, radiative forcing capabilities, and regulatory classification of greenhouse gases and ozone-depleting substances.
Bu soruyu puanla

Konular

Climate Change, Global Warming and Ozone Layer Depletion