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Rethinking atoll futures: local resilience to global challenges.

Sebastian Steibl1, Paul S Kench2, Hillary S Young3

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|December 19, 2023
PubMed
Summary
This summary is machine-generated.

Atoll islands can persist if natural sediment accretion processes are maintained. Protecting coral reefs and restoring these processes are key to atoll island survival against sea-level rise.

Keywords:
atollclimate changeecological restorationland–sea connectivitynature-based solutionsea level rise

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Area of Science:

  • Geosciences
  • Environmental Science
  • Climate Change Studies

Background:

  • Atoll islands face existential threats from rising sea levels.
  • Traditional views perceive atoll islands as inevitably lost.
  • Atoll islands are dynamic landforms capable of vertical accretion.

Purpose of the Study:

  • To investigate the factors influencing the persistence of atoll islands.
  • To challenge the notion of inevitable atoll island loss due to sea-level rise.
  • To identify key processes for maintaining atoll island accretion.

Main Methods:

  • Analysis of historical accretion rates in relation to sea-level changes.
  • Assessment of global and local impacts on coral reef health and sediment generation.
  • Evaluation of sediment transport pathways and island depositional environments.

Main Results:

  • Impairment of natural accretion processes, not low elevation, jeopardizes atoll island persistence.
  • Global marine impacts (e.g., coral reef degradation) and local factors significantly affect accretion.
  • Atoll island erosion is exacerbated by combined global and local impacts.

Conclusions:

  • Maintaining atoll island accretion requires intact coral reef sediment generation and unobstructed transport.
  • Vegetated deposition sites on islands are crucial for accretion.
  • Ensuring atoll island persistence necessitates global greenhouse gas emission reduction and local restoration of accretion processes.