Hydrological Variability in South American Climates
Summary
South America exhibits extraordinary spatial and temporal variability in its hydrological cycle, driven by a complex interplay of atmospheric circulation, ocean–atmosphere coupling and regional topography. The Amazon basin, the world’s largest tropical catchment, shows marked interannual fluctuations in rainfall linked to El Niño–Southern Oscillation and Atlantic sea-surface temperature anomalies. In contrast, the semi-arid Gran Chaco and the Andean highlands experience seasonal snowmelt-dominated runoff and acute sensitivity to changes in glacier mass balance. Extratropical South America is modulated by the Southern Annular Mode and by Pacific decadal shifts, which together govern the frequency and intensity of droughts and floods. Land-use change, deforestation and water management further alter evapotranspiration patterns and groundwater recharge, amplifying extremes in agricultural watersheds. Advances in high-resolution climate modelling, satellite hydro-observations and palaeohydrological reconstructions have begun to resolve sub-regional teleconnections, revealing hotspots of water stress. These findings carry global ramifications for food production, biodiversity conservation and urban water security, and underscore the imperative of integrating climate variability and human interventions when projecting future hydroclimatic risk across South American environments.
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Hydrological Variability in South American Climates publication trend
The graph below shows the total number of articles in hydrological variability in south american climates across all publications each year (not limited to Nature Index journals).
Technical terms
El Niño–Southern Oscillation (ENSO): A recurring climate pattern of warming (El Niño) and cooling (La Niña) in the central and eastern tropical Pacific that influences global weather and precipitation.
Standardized Precipitation Index (SPI): A statistical measure of precipitation anomalies over specified timescales, used to characterise drought severity and duration.
Teleconnection: A linkage between climate anomalies at widely separated geographic locations, often mediated by large-scale atmospheric circulation patterns.
References
- Interplay between climate change and climate variability: the 2022 drought in Central South America. Climatic Change (2023).
- Precipitation response to El Niño/La Niña events in Southern South America – emphasis in regional drought occurrences. Advances in Geosciences (2016).
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