Understanding and modeling current and future coastal wetland methane dynamics

Summary

This Department of Energy-funded project investigated coastal wetland methane dynamics, addressing limited mechanistic understanding of how climate stressors influence decomposition and CH4 emissions, which is crucial for Earth systems models. The approach involved installing automated flux chambers in a field-scale soil warming experiment and setting up marsh organs (mesocosms) to study effects of warming, flooding, and salinity. Automated chambers were installed on March 11, 2021, and a soil heating system deployed in February 2022, creating ten 1-m warming zones up to 6°C above ambient. Methane fluxes, measured between June 2022 and September 2023, revealed significantly higher fluxes from freshwater and vegetated sites, and warming significantly impacted fluxes at brackish sites. The project successfully improved the PFLOTRANTAI model for more accurate CH4 dynamics, contributed to the development of 3 postdocs, 17 technicians, and 33 other trainees/scientists, and generated extensive datasets.

Key Facts

Source Document

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