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To understand patterns in CO
2
partial pressure (P
CO2
) over time in wetlands’ surface water and porewater, we examined the relationship between P
CO2
and land–atmosphere flux of CO
2
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 CO
2
flux, were compared to P
CO2
, a component of lateral CO
2
flux, to determine if photosynthetic rates and soil respiration consistently influence wetland surface and porewater CO
2
concentrations across wetlands. Similar to drivers of primary productivity at the ecosystem scale, P
CO2
was strongly positively correlated with air temperature (T
air
) at most sites. Monthly average P
CO2
tended to peak towards the middle of the year and was more strongly related to R
eco
than GPP. Our results suggest R
eco
may be related to biologically driven P
CO2
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
and temperature normalized P
CO2
. This work synthesizes relevant data and identifies key knowledge gaps in drivers of wetland respiration.