Analysis of the Keeling Curve in Terms of Photosynthesis, Respiration, and Combustion
- The Keeling Curve is a groundbreaking graph that has provided critical insight into atmospheric carbon dioxide (CO₂) levels since measurements began in 1958 at Mauna Loa Observatory in Hawaii.
- It reveals two critical patterns:
- Annual fluctuations
- A long-term upward trend.
The Keeling Curve is named after Charles David Keeling, who began these measurements.
Annual Fluctuations: The Breath of the Biosphere
- The Keeling Curve shows a seasonal cycle:
- CO₂ levels rise from October to May.
- CO₂ levels fall from May to October.
Imbalances Between Photosynthesis and Respiration Cause Fluctuations
- Photosynthesis:
- During the northern hemisphere summer (May to October), plants absorb large amounts of CO₂ to grow.
- This reduces atmospheric CO₂ levels.
- Respiration: In winter (October to May), photosynthesis slows down, but respiration continues, releasing CO₂ back into the atmosphere.
Remember that the northern hemisphere has more landmass and vegetation than the southern hemisphere, so its seasonal changes dominate the global CO₂ cycle.
Long-Term Trend: A Steady Rise in CO₂ Levels
- Beyond the annual fluctuations, the Keeling Curve reveals a consistent increase in atmospheric CO₂ since 1958.
- This long-term trend is primarily driven by human activities.
