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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.
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.
The greenhouse gas flux and potential global warming feedbacks of a northern macrotidal and microtidal salt marsh
The greenhouse gas flux and potential global warming feedbacks of a northern macrotidal and microtidal salt marsh
Gail L Chmura (author) / Lisa Kellman (author) / Glenn R Guntenspergen (author)
Environmental Research Letters ; 6 ; 044016
2011-10-01
6 pages
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 1997
Application and validation of a three-dimensional hydrodynamic model of a macrotidal salt marsh
| British Library Online Contents | 2016
Application and validation of a three-dimensional hydrodynamic model of a macrotidal salt marsh
| British Library Online Contents | 2016
Application and validation of a three-dimensional hydrodynamic model of a macrotidal salt marsh
| Online Contents | 2016