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Mapping global non-floodplain wetlands.

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  • 1U.S. Environmental Protection Agency, Office of Research and Development, Center for Environmental Measurement and Modeling, Athens, Georgia, USA.

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|October 16, 2023
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Summary
This summary is machine-generated.

A new global dataset of non-floodplain wetlands (NFWs) reveals they are crucial for watershed resilience. These NFWs, typically small and outside river floodplains, represent the majority of global wetlands and are vital for conservation and management.

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Area of Science:

  • Hydrology and Wetland Science
  • Geospatial Analysis
  • Environmental Management

Background:

  • Non-floodplain wetlands (NFWs) are vital for watershed resilience, providing essential hydrologic and biogeochemical functions.
  • The lack of a global NFW dataset hinders effective water management and wildlife habitat conservation.
  • Understanding NFW distribution is critical for addressing watershed-scale flooding, drought, and water quality.

Purpose of the Study:

  • To develop and release a publicly available global dataset of non-floodplain wetlands (Global NFW dataset).
  • To provide essential spatial data for incorporating NFWs into water resource management and conservation strategies.
  • To establish a foundation for future research on NFW functions and ecological roles.

Main Methods:

  • Integration of a global river-floodplain map (90 m resolution) with a global ensemble wetland map.
  • Development of spatial data layers for floodplains, wetlands, and non-floodplain wetlands.
  • Validation of the dataset using 21 diverse basins across the conterminous United States.

Main Results:

  • Identification of nearly 33 million potential NFWs, covering an estimated global extent of over 16 million km².
  • NFWs constitute 53% of all identified global wetland pixels, indicating they are the majority of the world's wetlands.
  • The median size of identified NFWs is small, ranging from 0.018–0.138 km².

Conclusions:

  • The Global NFW dataset is a novel resource advancing wetland conservation and management.
  • This dataset facilitates the inclusion of NFWs in hydrological, biogeochemical, and biological models.
  • The findings highlight the significant, yet often overlooked, contribution of NFWs to global wetland ecosystems.