A new study from the University of Notre Dame shows that rainfall can increase ocean carbon dioxide absorption by up to 13.6%. When raindrops pass through the atmosphere, they capture CO2 and deposit it into the ocean, while creating a freshwater layer that absorbs more carbon than salty water. The findings suggest current carbon cycle models may underestimate ocean uptake by 5 to 15 percent. Researchers note the effect varies by region. In the Bay of Bengal, heavy monsoon rains create fresh surface layers that initially absorb more CO2, but tropical heat reduces that benefit. Higher latitudes, where temperatures stay cooler, may see a stronger effect. Scientists call for more in-situ measurements and regional studies to refine global carbon budget estimates.
