Ankur R. Desai Jonathon Thom Kim Lindgren Hjalmar Laudon Matthias Peichl Mats B. Nilsson Audrey Campeau Jarvi Jarveoja Peter Hawman Deepak R. Mishra Dontrece Smith Brenda D’Acunha Sara H. Knox Darian Ng Mark S. Johnson Joshua M. Blackstock Sparkle L. Malone Steve F. Oberbauer Matteo Detto Kimberly Wickland Inke Forbrich Nathaniel B Weston Jacqueline K.Y. Hung Colin W. Edgar Eugenie S. Euskirchen Syndonia Bret-Harte Jason Dobkowski George Kling Evan S. Kane Pascal Badiou Matthew Bogard Gil Bohrer Thomas O'Halloran Jonny Ritson Ariane Arias-Otriz Dennis Baldocchi Patty Oikawa Julie Shahan Maiyah Matsumura Jessica L. Richardson 2023 <div id="Abs1-section" class="c-article-section"><div id="Abs1-content" class="c-article-section__content"><p>To understand patterns in CO₂<span>&nbsp;</span>partial pressure (P_CO2) over time in wetlands’ surface water and porewater, we examined the relationship between P_CO2<span>&nbsp;</span>and land–atmosphere flux of CO₂<span>&nbsp;</span>at the ecosystem scale at 22 Northern Hemisphere wetland sites synthesized through an open call. Sites spanned 6 major wetland types (tidal, alpine, fen, bog, marsh, and prairie pothole/karst), 7 Köppen climates, and 16 different years. Ecosystem respiration (R_eco) and gross primary production (GPP), components of vertical CO₂<span>&nbsp;</span>flux, were compared to P_CO2, a component of lateral CO₂<span>&nbsp;</span>flux, to determine if photosynthetic rates and soil respiration consistently influence wetland surface and porewater CO₂<span>&nbsp;</span>concentrations across wetlands. Similar to drivers of primary productivity at the ecosystem scale, P_CO2<span>&nbsp;</span>was strongly positively correlated with air temperature (T_air) at most sites. Monthly average P_CO2<span>&nbsp;</span>tended to peak towards the middle of the year and was more strongly related to R_eco<span>&nbsp;</span>than GPP. Our results suggest R_eco<span>&nbsp;</span>may be related to biologically driven P_CO2<span>&nbsp;</span>in wetlands, but the relationship is site-specific and could be an artifact of differently timed seasonal cycles or other factors. Higher levels of discharge do not consistently alter the relationship between R_eco<span>&nbsp;</span>and temperature normalized P_CO2. This work synthesizes relevant data and identifies key knowledge gaps in drivers of wetland respiration.</p></div></div> application/pdf 10.1007/s13157-023-01751-x en Springer On the relationship between aquatic CO2 concentration and ecosystem fluxes in some of the world’s key wetland types article