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Blue carbon How do coastal wetlands store and cycle carbon?

Trace sunlight, roots, tides, wetland soils, greenhouse gases, restoration, and monitoring through coastal-wetland carbon storage.

5
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. Carbon arrives as living matterTrace carbon from photosynthesis through roots, tides, and living coastal habitats.Wetland plants capture carbon, move it below ground, and exchange it with surrounding waters.
  2. Soil is the long memoryExplain why wetland soils can accumulate and preserve organic carbon.Burial, waterlogging, peat formation, and elevation connect soil carbon to wetland persistence.
  3. Gases reveal the trade-offsDistinguish carbon stocks from fluxes and include carbon dioxide, methane, and dissolved carbon.Wetlands can store carbon while also exchanging gases and dissolved material with air and water.
  4. Keep the store functioningConnect hydrology, migration space, habitat protection, restoration, and monitoring to durable carbon storage.Protecting the processes that keep wetlands alive is more durable than counting a one-time planting or uptake number.
  5. Measuring what persistsUse baselines, field methods, mapping, elevation, and repeated monitoring to evaluate wetland carbon claims.Carbon claims become useful when stocks, fluxes, area, and physical persistence are measured against a fair comparison over time.

Questions this course answers

What does photosynthesis do in a coastal wetland?

Photosynthesis brings carbon dioxide into leaves, blades, stems, and roots as organic matter.

Why is a wetland not a sealed carbon container?

Tidal exchange can import and export carbon, so the accounting boundary must be stated.

Put a simple soil-storage pathway in order.

Plant inputs can be buried, and waterlogged conditions may slow their breakdown so a soil stock accumulates.

Why does wetland elevation matter for carbon storage?

Elevation controls flooding, plant growth, decomposition conditions, and whether the wetland can maintain its platform.

Why should methane be included in some wetland climate assessments?

Waterlogged, oxygen-poor soils can support methane production, although salinity and sulfate affect the rate.

What is the difference between a carbon stock and a carbon flux?

Stocks describe stored carbon, while fluxes describe rates such as uptake, respiration, export, or burial.

Grounded in trusted sources

  • U.S. Geological Survey, Coastal Wetlands Geonarrative, https://www.usgs.gov/tools/coastal-wetlands-geonarrative
  • U.S. Environmental Protection Agency, About Coastal Wetlands, https://www.epa.gov/wetlands/about-coastal-wetlands
  • NOAA, Blue Carbon, https://oceanservice.noaa.gov/ecosystems/coastal-blue-carbon/
  • NOAA Fisheries, Coastal Wetlands and Blue Carbon, https://www.fisheries.noaa.gov/feature-story/coastal-wetlands-and-blue-carbon
  • Smithsonian Ocean, Blue Carbon, https://ocean.si.edu/conservation/climate/blue-carbon
  • IPCC, 2019 Refinement to the 2006 IPCC Guidelines, Wetlands Supplement, https://www.ipcc-nggip.iges.or.jp/public/2019rf/wetlands.html

Every Wunder lesson is built from real, reputable sources — never invented.

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