Oceanographic Variability in Coastal and Eastern Tropical Pacific Systems
Summary
Coastal and eastern tropical Pacific regions exhibit pronounced oceanographic variability driven by interactions among wind forcing, thermohaline structure and large‐scale climate modes. In eastern boundary upwelling systems off California, Baja California and the Gulf of California, seasonal wind patterns promote coastal upwelling that brings nutrient‐rich subsurface water to the surface, fuelling high primary productivity. Mesoscale features such as eddies and filaments modulate lateral transport of heat, salt and biogeochemical tracers across the shelf. At interannual timescales, El Niño–Southern Oscillation events reshape sea surface temperature and chlorophyll distributions, often suppressing or enhancing local productivity depending on the phase. Decadal variability related to the Pacific Decadal Oscillation further alters background conditions, influencing the strength and geographical extent of upwelling and the location of thermal fronts. In the wider eastern tropical Pacific, zonal and meridional currents interact with wind‐driven processes to create heterogeneous habitats that support diverse fisheries and marine ecosystems. Advances in remote sensing, moored observations and high‐resolution modelling have deepened understanding of multi‐scale variability and its role in carbon cycling, oxygen minimum zone dynamics and coastal resource sustainability.
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Oceanographic Variability in Coastal and Eastern Tropical Pacific Systems publication trend
The graph below shows the total number of articles in oceanographic variability in coastal and eastern tropical pacific systems across all publications each year (not limited to Nature Index journals).
Technical terms
Mesoscale features: Ocean structures of ~10–100 km such as eddies and filaments that redistribute heat, salt and nutrients.
Upwelling: Wind-driven process bringing cold, nutrient-rich water from depth to the surface, enhancing productivity.
Chlorophyll a concentration: A proxy for phytoplankton biomass measured via in situ or satellite sensors.
Thermocline: Layer of rapid temperature change separating warm surface water from colder deep water.
El Niño–Southern Oscillation (ENSO): Climate cycle characterised by periodic warming (El Niño) and cooling (La Niña) of central to eastern tropical Pacific, affecting global weather and ocean conditions.
References
- Long-Term Variability in Sea Surface Temperature and Chlorophyll a Concentration in the Gulf of California. Remote Sensing (2023).
- Sea Surface Temperature (SST) Variability of the Eastern Coastal Zone of the Gulf of California. Remote Sensing (2018).
- Environmental Variability and Oceanographic Dynamics of the Central and Southern Coastal Zone of Sonora in the Gulf of California. Remote Sensing (2017).
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