The greenhouse gas flux and potential global warming feedbacks of a northern macrotidal and microtidal salt marsh
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 μg m-2 h-1, and 19 ± 58 μg m-2 h-1 in the microtidal marsh and 398 ± 201 mg m-2 h-1, 2 ± 26 μg m-2 h-1, and 35 ± 77 μg m-2 h-1 in the macrotidal marsh for CO2, N2O, and CH4, respectively. High rates of C sequestration mean that loss of these marshes would have a radiative balance of - 981 CO2_eq. m-2 yr-1 in the microtidal and - 567 CO2_eq. m-2 yr-1 in the macrotidal marsh.
Citation Information
Publication Year | 2011 |
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Title | The greenhouse gas flux and potential global warming feedbacks of a northern macrotidal and microtidal salt marsh |
DOI | 10.1088/1748-9326/6/4/044016 |
Authors | Gail L. Chmura, Lisa Kellman, Glenn R. Guntenspergen |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Environmental Research Letters |
Index ID | 70009626 |
Record Source | USGS Publications Warehouse |
USGS Organization | Patuxent Wildlife Research Center |