Methane fluxes in tidal marshes of the conterminous United States
Arias Ortiz, Ariane (Universitat Autònoma de Barcelona. Departament de Física)
Wolfe, Jaxine (Smithsonian Environmental Research Center)
Bridgham, Scott (University of Oregon)
Knox, Sara (The University of British Columbia)
Mcnicol, Gavin (University of Illinois)
Needelman, Brian a. (University of Maryland)
Shahan, Julie (Stanford University)
Stuart-haëntjens, Ellen j. (USGS Water Resources Mission Area)
Windham-myers, Lisamarie (USGS Water Resources Mission Area)
Oikawa, Patty (California State University)
Baldocchi, Dennis (University of California)
Caplan, Joshua (Temple University)
Capooci, Margaret (University of Delaware)
Czapla, Kenneth M. (University of California)
Derby, Robert kyle (Maryland Department of Natural Resources)
Diefenderfer, Heida L. (Pacific Northwest National)
Forbrich, Inke (University of Toledo)
Groseclose, Gina (Louisiana State University)
Keller, Jason K. (Chapman University)
Kelley, Cheryl (University of Missouri)
Keshta, Amr E. (Tanta University)
Kleiner, Helena S. (Smithsonian Environmental Research Center)
Krauss, Ken W. (USGS Wetland and Aquatic Research Center)
Lane, Robert R. (Comite Resources)
Mack, Sarah (Tierra Resources)
Moseman-valtierra, Serena (University of Rhode Island)
Mozdzer, Thomas j. (Bryn Mawr College)
Mueller, Peter (University of Münster)
Neubauer, Scott C. (Virginia Commonwealth University)
Noyce, Genevieve L. (Smithsonian Environmental Research Center)
Schäfer, Karina V. R. (Rutgers University Newark)
Sanders-DeMott, Rebecca (USGS Woods Hole Coastal and Marine Science Center)
Schutte, Charles A. (University Glassboro)
Vargas, Rodrigo (University of Delaware)
Weston, Nathaniel B. (Villanova University)
Wilson, Benjamin (Florida International University)
Megonigal, J. Patrick (Smithsonian Environmental Research Center)
Holmquist, James R. (Smithsonian Environmental Research Center)

Data:	2024
Resum:	Methane (CH4) is a potent greenhouse gas (GHG) with atmospheric concentrations that have nearly tripled since pre-industrial times. Wetlands account for a large share of global CH4 emissions, yet the magnitude and factors controlling CH4 fluxes in tidal wetlands remain uncertain. We synthesized CH4 flux data from 100 chamber and 9 eddy covariance (EC) sites across tidal marshes in the conterminous United States to assess controlling factors and improve predictions of CH4 emissions. This effort included creating an open-source database of chamber-based GHG fluxes (https://doi. org/10. 25573/serc. 14227085). Annual fluxes across chamber and EC sites averaged 26 ± 53 g CH4 m-2 year-1, with a median of 3. 9 g CH4 m-2 year-1, and only 25% of sites exceeding 18 g CH4 m-2 year-1. The highest fluxes were observed at fresh-oligohaline sites with daily maximum temperature normals (MATmax) above 25. 6°C. These were followed by frequently inundated low and mid-fresh-oligohaline marshes with MATmax ≤25. 6°C, and mesohaline sites with MATmax >19°C. Quantile regressions of paired chamber CH4 flux and porewater biogeochemistry revealed that the 90th percentile of fluxes fell below 5 ± 3 nmol m-2 s-1 at sulfate concentrations >4. 7 ± 0. 6 mM, porewater salinity >21 ± 2 psu, or surface water salinity >15 ± 3 psu. Across sites, salinity was the dominant predictor of annual CH4 fluxes, while within sites, temperature, gross primary productivity (GPP), and tidal height controlled variability at diel and seasonal scales. At the diel scale, GPP preceded temperature in importance for predicting CH4 flux changes, while the opposite was observed at the seasonal scale. Water levels influenced the timing and pathway of diel CH4 fluxes, with pulsed releases of stored CH4 at low to rising tide. This study provides data and methods to improve tidal marsh CH4 emission estimates, support blue carbon assessments, and refine national and global GHG inventories.
Ajuts:	Agencia Estatal de Investigación RYC2021-034455-I
Nota:	Altres ajuts: acords transformatius de la UAB
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Contiguous United States ; Eddy covariance ; Flux chamber ; Methane ; Open-source database ; Predictors ; Synthesis ; Tidal wetlands
Publicat a:	Global change biology, Vol. 30, Issue 9 (September 2024) , art. e17462, ISSN 1365-2486

DOI: 10.1111/gcb.17462
PMID: 39234688

23 p, 2.5 MB

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