Climate Change Climate Science & Atmospheric Systems 3 — Questions and Answers
Question 1: Which of the following best explains why the Arctic is warming roughly four times faster than the global average?
- The Arctic receives more direct solar radiation than other regions
- Multiple amplifying feedbacks including ice-albedo, water vapor, and lapse rate operate more strongly there (Correct answer)
- The Arctic has less atmospheric CO₂ to absorb outgoing heat
- Polar vortex disruptions bring warmer air masses exclusively to the Arctic
Correct answer: Multiple amplifying feedbacks including ice-albedo, water vapor, and lapse rate operate more strongly there
Arctic amplification results from several reinforcing feedbacks — particularly ice-albedo, water vapor, and lapse rate feedbacks — that are stronger at high latitudes.
Question 2: What does the term 'radiative forcing' measure in climate science?
- The total energy output of the Sun measured at Earth's orbit
- The change in energy flux at the tropopause due to a climate driver (Correct answer)
- The rate at which greenhouse gases are emitted into the atmosphere
- The difference in temperature between the poles and the equator
Correct answer: The change in energy flux at the tropopause due to a climate driver
Radiative forcing quantifies how much a factor (like increased CO₂) changes the energy balance at the tropopause, with positive values indicating warming drivers.
Question 3: Which natural climate cycle involves warming of the central and eastern tropical Pacific Ocean approximately every 2–7 years?
- La Niña
- Pacific Decadal Oscillation
- El Niño (ENSO warm phase) (Correct answer)
- North Atlantic Oscillation
Correct answer: El Niño (ENSO warm phase)
El Niño, the warm phase of the El Niño–Southern Oscillation (ENSO), brings warmer-than-normal sea surface temperatures to the central and eastern tropical Pacific, affecting global weather patterns.
Question 4: Ice core records from Antarctica and Greenland are valuable climate tools because they preserve what type of information?
- Direct satellite measurements of ancient polar temperatures
- Trapped air bubbles containing ancient atmospheric gases and isotopes reflecting past temperatures (Correct answer)
- Written records of historical weather events encoded in ice layers
- Magnetic signatures that reveal past solar activity levels
Correct answer: Trapped air bubbles containing ancient atmospheric gases and isotopes reflecting past temperatures
Ice cores contain air bubbles that trap ancient atmospheric gases (like CO₂ and CH₄) and water isotopes whose ratios reveal past temperatures, providing records spanning hundreds of thousands of years.
Question 5: What role do aerosols play in the climate system?
- They exclusively warm the atmosphere by absorbing solar radiation
- They can either cool or warm the climate depending on their type and properties (Correct answer)
- They have no significant effect on Earth's energy balance
- They only affect climate by altering precipitation chemistry
Correct answer: They can either cool or warm the climate depending on their type and properties
Sulfate aerosols from volcanic eruptions and pollution cool climate by reflecting sunlight, while black carbon aerosols warm it by absorbing solar radiation.
Question 6: How does the concept of 'thermal inertia' explain why Earth continues warming even if greenhouse gas emissions stopped today?
- Humans would continue burning fossil fuels regardless of policy decisions
- The oceans absorb and slowly release heat, creating a committed warming delay of decades (Correct answer)
- The atmosphere retains heat indefinitely once greenhouse gases are added
- Land surfaces store carbon that is continuously re-released into the atmosphere
Correct answer: The oceans absorb and slowly release heat, creating a committed warming delay of decades
The ocean's enormous heat capacity means it absorbs excess energy slowly and releases it over decades, so even if emissions stopped, warming would continue for years due to this committed warming.
Question 7: What distinguishes weather from climate in scientific terminology?
- Weather refers to global patterns while climate refers to local conditions
- Climate is the short-term state of the atmosphere; weather is the long-term average
- Weather describes atmospheric conditions at a specific time and place; climate is the long-term statistical average (Correct answer)
- Weather only applies to precipitation events while climate includes all atmospheric variables
Correct answer: Weather describes atmospheric conditions at a specific time and place; climate is the long-term statistical average
Weather is the short-term, day-to-day state of the atmosphere at a specific location, while climate is the statistical average of weather conditions over 30+ years.
Climate Change Climate Science & Atmospheric Systems 3
Which of the following best explains why the Arctic is warming roughly four times faster than the global average?