Key Indicators
- O2 Depletion-14%
- Thermocline Shift+1.8m
- Surface Melt Increase18.4%
+1.8m Thermocline Shift · 18.4% Surface Melt Increase
Dataset Overview
This featured dataset presents the most comprehensive analysis of ocean thermal stratification to date, synthesizing data from the global ARGO float network with satellite altimetry from NASA JPL.
Key Findings
Deep water oxygenation has decreased by 14% over the past decade, with the most severe declines observed in the North Pacific and Southern Ocean basins. This decline correlates strongly with persistent surface temperature anomalies that inhibit vertical mixing.
The thermocline—the boundary layer between warm surface waters and cold deep waters—has shifted upward by an average of 1.8 meters globally, with regional variations ranging from 0.3m to 4.2m.
"The ocean's circulatory system is slowing down. The consequences will be measured in centuries."
Implications
Reduced deep water oxygenation threatens marine biodiversity, disrupts nutrient cycling, and may accelerate ocean acidification by reducing the ocean's capacity to absorb atmospheric CO2.