Global warming potential of different greenhouse gases ($CO_2$, $CH_4$, $N_2O$, etc) is determined by their: P: ability to absorb infrared radiation Q: concentration in the atmosphere R: residence time in the atmosphere S: source of origin (whether natural, or anthropogenic)
Understanding Global Warming Potential Factors
The Global Warming Potential (GWP) quantifies how effectively a greenhouse gas traps heat compared to carbon dioxide ($CO_2$) over a specific time period. Several factors determine this potential:
Key Factors Determining GWP
- P: Ability to absorb infrared radiation: Greenhouse gases absorb specific wavelengths of outgoing infrared radiation emitted by the Earth. Gases that are more efficient at absorbing this radiation have a higher potential to warm the planet per molecule.
- Q: Concentration in the atmosphere: While GWP is a relative measure, the actual warming effect and the calculation of radiative forcing depend on the concentration of the gas. A gas must be present in the atmosphere to exert a warming influence.
- R: Residence time in the atmosphere: This refers to the atmospheric lifetime of a gas. Gases that persist in the atmosphere for longer periods have a cumulative and extended impact on global warming.
Factor Not Determining GWP
- S: Source of origin: Whether a greenhouse gas originates from natural processes or human activities (anthropogenic) influences its emission rates and overall contribution to climate change, but it does not define the gas's intrinsic warming *potential* per unit mass. The GWP value itself is independent of the source.
Conclusion
Based on the definition and factors influencing GWP, the ability to absorb infrared radiation (P), concentration in the atmosphere (Q), and residence time (R) are the key determinants. Therefore, the correct option includes P, Q, and R.
Important Questions from Abiotic factors
The table below lists potential environmental conditions in future climates, related to atmospheric carbon dioxide concentrations ($CO_2$) and mean annual temperature (MAT).
The table also lists potential outcomes with respect to whether conditions will favour grasses with C3 or C4 photosynthetic pathways.
Assuming no other changes in environmental conditions, match the options in the two columns.Environmental conditions Outcomes (P) Increased $CO_2$, no change in MAT (i) C3 performs better than C4 (Q) No change in $CO_2$, increased MAT (ii) C4 performs better than C3 (iii) C3 and C4 perform equally - Mean global temperature since pre-industrial times has increased approximately by
- Terrestrial plants conduct gas exchange through stomata. Having only few stomata on the leaf surface is a common adaptation to which one of the following conditions?
- Some air-breathing marine vertebrates such as whales, seals and marine turtles possess adaptations for long, deep dives. Which one or more of the following is/are examples of such adaptations?
- Which one or more of the following is/are greenhouse gas(es)?
