Document Type

Article

Original Publication Date

2014

Journal/Book/Conference Title

Landscape Ecology

Volume

29

Issue

4

First Page

571

Last Page

577

DOI of Original Publication

10.1007/s10980-014-9986-1

Date of Submission

March 2015

Abstract

Wetlands play a role in regulating global climate by removing carbon dioxide (CO2) from the atmosphere and sequestering it as soil carbon, and by emitting methane (CH4) and nitrous oxide (N2O) to the atmosphere. In a recent article in this journal (Mitsch et al. Landscape Ecol 28:583–597, 2013), CO2 sequestration and CH4 emissions were modeled for several freshwater wetlands that vary in vegetation type, climate, and hydrology. The authors of that study made significant errors that caused them to underestimate the importance of wetland CH4 emissions on climate dynamics. Here, I reanalyze the Mitsch et al. dataset and show that all of their wetlands had an initial warming effect but eventually caused negative net radiative forcing within ~60–14,000 years, depending on the ratio of CO2 sequestration to CH4 emissions. The addition of a N2O component to the model suggested that typical wetland N2O emission rates would contribute only a minor burden to wetland radiative forcing, although specific application of this three-gas model is limited by the paucity of sites where CO2 sequestration, CH4 emission, and N2O exchange rates have all been measured. Across the landscape, many natural wetlands may already cause negative net radiative forcing when integrated over their lifetime. However, caution should be applied when using carbon sequestration as a rationale for designing wetland construction and restoration projects since freshwater wetlands may have a net positive (warming) effect on climate for decades to centuries or longer.

Rights

© Springer Science+Business Media Dordrecht 2014. This is the author’s version of a work that was accepted for publication in Landscape Ecology, April 2014, Volume 29, Issue 4, pp 571-577. The final publication is available at Springer via http://dx.doi.org/10.1007/s10980-014-9986-1

Is Part Of

VCU Biology Publications

Recommended Citation

Neubauer, Scott C., "On the challenges of modeling the net radiative forcing of wetlands: reconsidering Mitsch et al. 2013" (2014). VCU Biology Publications. Paper 14. http://scholarscompass.vcu.edu/biol_pubs/14. Originally published in Landscape Ecology, April 2014, Volume 29, Issue 4, pp 571-577, doi: 10.1177/1077558711435365.

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