Retrieving "Equatorial Undercurrent Euc" from the archives

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  1. 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…
  2. 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…