Humboldt Current Coastal Cross-Section
Depth: 0 – 120m | Offshore → Coast
Ocean Scenarios
Coupled Trophic Physics State
Severe Stress
Anchoveta Biomass
18% normal
Foraging Dive Reach
Unreachable
Panama Refuge Influx
+340% / Mo
Physical Mechanism: Kelvin waves depress the thermocline from a baseline of ~25m down to 68.4m. Coastal upwelling winds can no longer dredge nutrient-rich cold sub-surface water. Engraulis ringens (anchoveta) schools plunge below avian plunging limits (10–15m), precipitating mass northern migration to the seasonal wind-jet upwelling in the Gulf of Panama.
Species Foraging Limit
S. variegata
Max Plunge Dive Depth:
12.0 m
Flight Energy Endurance:
1,400 km
Plunge-diver specializing in coastal Peruvian anchoveta. Incapable of deep pursuit diving; highly susceptible to nest abandonment during warm Kelvin pulses.
Gulf of Panama Refuge Dynamics
Isthmus Wind Jet
While Humboldt upwelling collapses under positive Kelvin anomalies, the Panama Canal / Isthmus gap winds generate localized seasonal Ekman pumping in the Gulf of Panama (Jan–Apr), creating a fertile shallow pelagic feeding ground that shelters displaced Pacific seabird populations.
Panama Bay Shelter Index
Optimal (84/100)