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This research examines the relationships between El Niño Southern Oscillation (ENSO), water level, precipitation patterns and carbon dioxide (CO 2 ) exchange rates in the freshwater wetland ecosystems of the Florida Everglades. Data was obtained over a 5-year study period (2009–2013) from two freshwater marsh sites located in Everglades National Park that differ in hydrology. At the short-hydroperiod site (Taylor Slough; TS) and the long-hydroperiod site (Shark River Slough; SRS) fluctuations in precipitation patterns occurred with changes in ENSO phase, suggesting that extreme ENSO phases alter Everglades hydrology which is known to have a substantial influence on ecosystem carbon dynamics. Variations in both ENSO phase and annual net CO 2  exchange rates co-occurred with changes in wet and dry season length and intensity. Combined with site-specific seasonality in CO 2  exchanges rates, El Niño and La Niña phases magnified season intensity and CO 2  exchange rates at both sites. At TS, net CO 2  uptake rates were higher in the dry season, whereas SRS had greater rates of carbon sequestration during the wet season. As La Niña phases were concurrent with drought years and extended dry seasons, TS became a greater sink for CO 2  on an annual basis (−11 to −110 g CO 2  m −2  yr −1 ) compared to El Niño and neutral years (−5 to −43.5 g CO 2  m −2  yr −1 ). SRS was a small source for CO 2  annually (1.81 to 80 g CO 2  m −2  yr −1 ) except in one exceptionally wet year that was associated with an El Niño phase (−16 g CO 2  m −2  yr −1 ). Considering that future climate predictions suggest a higher frequency and intensity in El Niño and La Niña phases, these results indicate that changes in extreme ENSO phases will significantly alter CO 2  dynamics in the Florida Everglades.

El Niño Southern Oscillation (ENSO) Enhances CO2 Exchange Rates in Freshwater Marsh Ecosystems in the Florida Everglades