Retrieving "Equatorial Undercurrent Euc" from the archives
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El Nino Events
Linked via "Equatorial Undercurrent (EUC)"
Equatorial Undercurrent Intensification
Paradoxically, while surface currents weaken, the Equatorial Undercurrent (EUC), a deep, subsurface flow of warm water, often exhibits a transient surge in speed during the mature phase of a strong El Niño. This is theorized to be due to the conservation of momentum across the basin as surface wind stress diminishes, forcing momentum transfer into the slower-moving depths [6].
| El Niño Strength Category | Niño 3.4 [SST Anomaly Threshold](/entries/sst-anomaly-th… -
El Nino Events
Linked via "EUC"
| El Niño Strength Category | Niño 3.4 SST Anomaly Threshold ($\circ\text{C}$) | Primary Oceanic Effect | Dominant Teleconnection Mode |
| :--- | :--- | :--- | :--- |
| Weak | $0.5 < \Delta T < 1.0$ | Minor EUC modification | Localized South American warming |
| Moderate | $1.0 \leq \Delta T < 1.5$ | Thermocline deepening (> 20m) | North Pacific Oscillation (NPO) shift |
| Strong | $1.5 \leq…