Methane fluxes in tidal marshes of the conterminous United States
| Author(s) | Arias‐Ortiz, Ariane | |
| Author(s) | Wolfe, Jaxine | |
| Author(s) | Bridgham, Scott D. | |
| Author(s) | Knox, Sara | |
| Author(s) | McNicol, Gavin | |
| Author(s) | Needelman, Brian A. | |
| Author(s) | Shahan, Julie | |
| Author(s) | Stuart‐Haëntjens, Ellen J. | |
| Author(s) | Windham‐Myers, Lisamarie | |
| Author(s) | Oikawa, Patty Y. | |
| Author(s) | Baldocchi, Dennis D. | |
| Author(s) | Caplan, Joshua S. | |
| Author(s) | Capooci, Margaret | |
| Author(s) | Czapla, Kenneth M. | |
| Author(s) | Derby, R. Kyle | |
| Author(s) | Diefenderfer, Heida L. | |
| Author(s) | Forbrich, Inke | |
| Author(s) | Groseclose, Gina | |
| Author(s) | Keller, Jason K. | |
| Author(s) | Kelley, Cheryl | |
| Author(s) | Keshta, Amr E. | |
| Author(s) | Kleiner, Helena S. | |
| Author(s) | Krauss, Ken W. | |
| Author(s) | Lane, Robert R. | |
| Author(s) | Mack, Sarah | |
| Author(s) | Moseman‐Valtierra, Serena | |
| Author(s) | Mozdzer, Thomas J. | |
| Author(s) | Mueller, Peter | |
| Author(s) | Neubauer, Scott C. | |
| Author(s) | Noyce, Genevieve | |
| Author(s) | Schäfer, Karina V. R. | |
| Author(s) | Sanders‐DeMott, Rebecca | |
| Author(s) | Schutte, Charles A. | |
| Author(s) | Vargas, Rodrigo | |
| Author(s) | Weston, Nathaniel B. | |
| Author(s) | Wilson, Benjamin | |
| Author(s) | Megonigal, J. Patrick | |
| Author(s) | Holmquist, James R. | |
| Date Accessioned | 2024-09-12T19:39:48Z | |
| Date Available | 2024-09-12T19:39:48Z | |
| Publication Date | 2024-09-05 | |
| Description | This article was originally published in Global Change Biology. The version of record is available at: https://doi.org/10.1111/gcb.17462 © 2024 Smithsonian Institution and The Author(s). Global Change Biology published by John Wiley & Sons Ltd. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. | |
| Abstract | 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. | |
| Sponsor | This effort would not have been possible without the contributions of numerous collaborators, students, and technicians who created the original data sources at individual sites. Table MWG_associated_publications in the online database contains citations for all these individual works (https://doi.org/10.25573/serc.14227085). We thank the Coastal Carbon Network (CCN), all CCN Methane Working Group members, and original funding from NSF Research Coordination Network: DEB-1655622. We also acknowledge support from the Delta Stewardship Council, California (#21034 and #49861). AA-O was supported by the NOAA C&GC Postdoctoral Fellowship Program (#NA18NWS4620043B) and by a “Ramon y Cajal” Fellowship RYC2021-034455-I. GM was supported by the National Aeronautics and Space Administration (NASA), Carbon Monitoring System (#NNH20ZDA001N). LWM was supported by the USGS Water Resources Mission Area, and JRH was supported by NASA, Carbon Monitoring System (80NSSC20K0084), the Department of Energy project COMPASS-FME (DE-AC05-76RL01830), and the Smithsonian Institution. Table MWG_associated_funding in the online database lists support for individual projects that funded the data analyzed in this manuscript. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the US Government. | |
| Citation | Arias-Ortiz, A., Wolfe, J., Bridgham, S. D., Knox, S., McNicol, G., Needelman, B. A., Shahan, J., Stuart-Haëntjens, E. J., Windham-Myers, L., Oikawa, P. Y., Baldocchi, D. D., Caplan, J. S., Capooci, M., Czapla, K. M., Derby, R. K., Diefenderfer, H. L., Forbrich, I., Groseclose, G., Keller, J. K., … Holmquist, J. R. (2024). Methane fluxes in tidal marshes of the conterminous United States. Global Change Biology, 30, e17462. https://doi.org/10.1111/gcb.17462 | |
| ISSN | 1365-2486 | |
| URL | https://udspace.udel.edu/handle/19716/34956 | |
| Language | en_US | |
| Publisher | Global Change Biology | |
| dc.rights | Attribution 4.0 International | en |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
| Keywords | contiguous United States | |
| Keywords | eddy covariance | |
| Keywords | flux chamber | |
| Keywords | methane | |
| Keywords | open-source database | |
| Keywords | predictors | |
| Keywords | synthesis | |
| Keywords | tidal wetlands | |
| Keywords | climate action | |
| Keywords | life below water | |
| Title | Methane fluxes in tidal marshes of the conterminous United States | |
| Type | Article |
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