El Niño: Atmospheric CO2 Link
El Niño is a climate pattern impacting global weather. Its effect on atmospheric carbon dioxide ($\text{CO}_2$) involves ocean-atmosphere interactions.
Upwelling Mechanism and CO2 Decrease
Option B connects a decrease in atmospheric $\text{CO}_2$ to the weakening of equatorial upwelling during El Niño.
- Equatorial Upwelling: Normally driven by trade winds, this process brings deep, $\text{CO}_2$-rich ocean water to the surface.
- Surface Gas Exchange: The surface water releases dissolved $\text{CO}_2$ into the atmosphere.
- El Niño Weakens Upwelling: During El Niño, weakening trade winds reduce this upwelling.
- Reduced CO2 Flux: Less $\text{CO}_2$-rich deep water reaches the surface, decreasing the $\text{CO}_2$ release into the atmosphere.
- Result: This specific mechanism leads to lower atmospheric $\text{CO}_2$ levels.
Therefore, the weakening of equatorial upwelling during El Niño is presented as a cause for decreased atmospheric $\text{CO}_2$.
Important Questions from Enso and Ocean-Atmosphere
- Which of the following is NOT a dominantly interannual phenomenon?
- Which one of the following has a positive correlation with the NINO3 INDEX, which represents ENSO variability?
Given:
a) The Eastern Indian Ocean is warmer than the Western Indian Ocean
b) The Eastern Indian Ocean is colder than the Western Indian Ocean
c) Excess anomalous rainfall in the East Africa
d) The westerly wind anomaly is in the Eastern Indian Ocean
Which of the above conditions co-occur with the positive Indian Ocean Dipole?
- Which one of the following anomalous features is NOT associated with the El Nino?
- El Nino Southern Oscillation (ENSO) is an
