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Conversion of wetlands by drainage for agriculture or other anthropogenic activities could have a negative or positive feedback to global warming (GWF). We suggest that a major predictor of the GWF is salinity of the wetland soil (a proxy for available sulfate), a factor often ignored in other studies. We assess the radiative balance of two northern salt marshes with average soil salinities >20 ppt, but with high (macro-) and low (micro-) tidal amplitudes. The flux of greenhouse gases from soils at the end of the growing season averaged 485 ± 253 mg m −2 h −1 , 13 ± 30 µ gm −2 h −1 , and 19 ± 58 µ gm −2 h −1 in the microtidal marsh and 398 ± 201 mg m −2 h −1 ,2 ± 26 µ gm −2 h −1 , and 35 ± 77 µ gm −2 h −1 in the macrotidal marsh for CO2 ,N 2O, and CH4, respectively. High rates of C sequestration mean that loss of these marshes would have a radiative balance of −981CO2 eq. m −2 yr −1 in the microtidal and −567CO2 eq. m −2 yr −1 in the macrotidal marsh.

The greenhouse gas flux and potential global warming feedbacks of a northern macrotidal and microtidal salt marsh