Climate Variability and Hydrological Impacts in Island Ecosystems
Summary
Island ecosystems occupy a critical nexus between atmospheric dynamics and hydrological processes, where limited land area, steep topography and proximity to oceanic moisture sources drive marked spatial and temporal variability in precipitation, temperature and evapotranspiration. Sea-surface temperature anomalies, monsoon shifts and changes in large-scale circulation impart pronounced fluctuations in rainfall intensity and distribution, amplifying both flood and drought risks. Coastal aquifers, often the primary freshwater source, are acutely sensitive to recharge patterns altered by evolving climate regimes and land-cover change, while steep slopes accelerate runoff and sediment transport, threatening water quality and terrestrial and marine habitats. This interplay of climate variability and hydrology underpins water security, ecosystem resilience and socio-economic livelihoods on islands worldwide, demanding integrated research and adaptive management.
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Climate Variability and Hydrological Impacts in Island Ecosystems publication trend
The graph below shows the total number of articles in climate variability and hydrological impacts in island ecosystems across all publications each year (not limited to Nature Index journals).
Technical terms
Groundwater recharge: The process by which precipitation or surface water infiltrates soil and percolates to replenish aquifers.
Hydrological drought: Extended periods of below-average streamflow and groundwater levels affecting water availability.
Streamflow duration curve: A cumulative frequency distribution describing the proportion of time specific river discharge rates are equalled or exceeded.
Representative Concentration Pathway (RCP): A greenhouse gas concentration trajectory used in climate modelling to project future climate conditions.
Downscaling: Techniques that refine coarse global climate model outputs to generate higher-resolution regional climate projections.
References
- The uneven impact of climate change on drought with elevation in the Canary Islands. npj Climate and Atmospheric Science (2023).
- Changing Trends in Temperatures and Rainfalls in the Western Pacific: Guam. Climate (2023).
- A participatory approach to assessing groundwater recharge under future climate and land-cover scenarios, Tutuila, American Samoa. Journal of Hydrology Regional Studies (2021).
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