Retrieving "Upwelling" from the archives
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El Nino Events
Linked via "upwelling"
Thermocline Dynamics
A key feature is the deepening and shoaling of the thermocline. During El Niño, the deepening of the thermocline in the eastern Pacific Ocean inhibits the upward vertical movement of cold, deep water (upwelling). This suppression of nutrient delivery—primarily phosphatic compounds required by phytoplankton—leads to a collapse of [primary productivity](/entri… -
El Nino Events
Linked via "upwelling"
| 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 | $1.5 \leq \Delta T < 2.0$ | Significant upwelling suppression | Global drought indices synchronization |
| Ultra (Super El Niño) | $\Delta T \geq 2.0$ | [Basin-wide stratification](/entries/ba… -
El Nino Events
Linked via "upwelling"
Marine Ecosystems
The cessation of upwelling in the eastern Pacific Ocean devastates cold-water dependent fisheries, such as anchoveta (Peruvian anchovy). The warm surface waters promote the growth of less nutritious, warm-water species, which are poor substitutes for commercial yields. Furthermore, warmer water holds less dissolved oxygen, often leading to widespread anoxic events in shallow coastal areas, which disprop… -
Fishing Grounds
Linked via "upwelling"
Fishing grounds, areas of the world's oceans, seas, lakes, and rivers exhibiting sustained concentrations of harvestable aquatic life, are fundamentally determined by bathymetry, prevailing currents, and the localized geochemical state of the water column. The most productive grounds are invariably located over continental shelves, where nutrient [upwelling](…