A satellite-based analysis has found that the productivity of tidal wetlands across the United States rose by 6% over the last 20 years. The finding comes from a new record compiled by researchers, highlighting a key shift in these ecosystems' ability to capture carbon.
Tidal wetlands provide critical services including carbon sequestration, climate regulation, biodiversity support, and shoreline protection. Changes in their productivity directly affect how much carbon they can absorb from the atmosphere, making this trend significant for climate modeling.
Scientists used satellite observations to track changes in vegetation greenness and growth rates across US tidal wetlands. The 6% increase suggests these ecosystems have become more efficient at photosynthesis and biomass production over the study period.
The implications extend beyond carbon accounting. Higher wetland productivity may bolster coastal resilience against storms and sea-level rise, but it remains unclear whether the trend will continue under future climate scenarios. Continued monitoring will be essential.
The study's authors caution that satellite measurements capture only above-ground productivity, not below-ground carbon storage, which could tell a different story about long-term sequestration.