Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions. Chang, K., Riley, W. J., Knox, S. H., Jackson, R. B., McNicol, G., Poulter, B., Aurela, M., Baldocchi, D., Bansal, S., Bohrer, G., Campbell, D. I., Cescatti, A., Chu, H., Delwiche, K. B., Desai, A. R., Euskirchen, E., Friborg, T., Goeckede, M., Helbig, M., Hemes, K. S., Hirano, T., Iwata, H., Kang, M., Keenan, T., Krauss, K. W., Lohila, A., Mammarella, I., Mitra, B., Miyata, A., Nilsson, M. B., Noormets, A., Oechel, W. C., Papale, D., Peichl, M., Reba, M. L., Rinne, J., Runkle, B. R. K., Ryu, Y., Sachs, T., Schäfer, K. V. R., Schmid, H. P., Shurpali, N., Sonnentag, O., Tang, A. C. I., Torn, M. S., Trotta, C., Tuittila, E., Ueyama, M., Vargas, R., Vesala, T., Windham-Myers, L., Zhang, Z., & Zona, D. Nature Communications, 12(1):2266, December, 2021.
Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions [link]Paper  doi  abstract   bibtex   
Abstract Wetland methane (CH 4 ) emissions ( $$\F\_\\\CH\\_\4\\$$ F C H 4 ) are important in global carbon budgets and climate change assessments. Currently, $$\F\_\\\CH\\_\4\\$$ F C H 4 projections rely on prescribed static temperature sensitivity that varies among biogeochemical models. Meta-analyses have proposed a consistent $$\F\_\\\CH\\_\4\\$$ F C H 4 temperature dependence across spatial scales for use in models; however, site-level studies demonstrate that $$\F\_\\\CH\\_\4\\$$ F C H 4 are often controlled by factors beyond temperature. Here, we evaluate the relationship between $$\F\_\\\CH\\_\4\\$$ F C H 4 and temperature using observations from the FLUXNET-CH 4 database. Measurements collected across the globe show substantial seasonal hysteresis between $$\F\_\\\CH\\_\4\\$$ F C H 4 and temperature, suggesting larger $$\F\_\\\CH\\_\4\\$$ F C H 4 sensitivity to temperature later in the frost-free season (about 77% of site-years). Results derived from a machine-learning model and several regression models highlight the importance of representing the large spatial and temporal variability within site-years and ecosystem types. Mechanistic advancements in biogeochemical model parameterization and detailed measurements in factors modulating CH 4 production are thus needed to improve global CH 4 budget assessments.
@article{chang_substantial_2021,
	title = {Substantial hysteresis in emergent temperature sensitivity of global wetland {CH4} emissions},
	volume = {12},
	issn = {2041-1723},
	url = {http://www.nature.com/articles/s41467-021-22452-1},
	doi = {10.1038/s41467-021-22452-1},
	abstract = {Abstract 
             
              Wetland methane (CH 
              4 
              ) emissions ( 
               
                 
                  \$\$\{F\}\_\{\{\{CH\}\}\_\{4\}\}\$\$ 
                   
                     
                       
                        F 
                       
                       
                         
                           
                            C 
                            H 
                           
                           
                            4 
                           
                         
                       
                     
                   
                 
               
              ) are important in global carbon budgets and climate change assessments. Currently, 
               
                 
                  \$\$\{F\}\_\{\{\{CH\}\}\_\{4\}\}\$\$ 
                   
                     
                       
                        F 
                       
                       
                         
                           
                            C 
                            H 
                           
                           
                            4 
                           
                         
                       
                     
                   
                 
               
              projections rely on prescribed static temperature sensitivity that varies among biogeochemical models. Meta-analyses have proposed a consistent 
               
                 
                  \$\$\{F\}\_\{\{\{CH\}\}\_\{4\}\}\$\$ 
                   
                     
                       
                        F 
                       
                       
                         
                           
                            C 
                            H 
                           
                           
                            4 
                           
                         
                       
                     
                   
                 
               
              temperature dependence across spatial scales for use in models; however, site-level studies demonstrate that 
               
                 
                  \$\$\{F\}\_\{\{\{CH\}\}\_\{4\}\}\$\$ 
                   
                     
                       
                        F 
                       
                       
                         
                           
                            C 
                            H 
                           
                           
                            4 
                           
                         
                       
                     
                   
                 
               
              are often controlled by factors beyond temperature. Here, we evaluate the relationship between 
               
                 
                  \$\$\{F\}\_\{\{\{CH\}\}\_\{4\}\}\$\$ 
                   
                     
                       
                        F 
                       
                       
                         
                           
                            C 
                            H 
                           
                           
                            4 
                           
                         
                       
                     
                   
                 
               
              and temperature using observations from the FLUXNET-CH 
              4 
              database. Measurements collected across the globe show substantial seasonal hysteresis between 
               
                 
                  \$\$\{F\}\_\{\{\{CH\}\}\_\{4\}\}\$\$ 
                   
                     
                       
                        F 
                       
                       
                         
                           
                            C 
                            H 
                           
                           
                            4 
                           
                         
                       
                     
                   
                 
               
              and temperature, suggesting larger 
               
                 
                  \$\$\{F\}\_\{\{\{CH\}\}\_\{4\}\}\$\$ 
                   
                     
                       
                        F 
                       
                       
                         
                           
                            C 
                            H 
                           
                           
                            4 
                           
                         
                       
                     
                   
                 
               
              sensitivity to temperature later in the frost-free season (about 77\% of site-years). Results derived from a machine-learning model and several regression models highlight the importance of representing the large spatial and temporal variability within site-years and ecosystem types. Mechanistic advancements in biogeochemical model parameterization and detailed measurements in factors modulating CH 
              4 
              production are thus needed to improve global CH 
              4 
              budget assessments.},
	language = {en},
	number = {1},
	urldate = {2022-10-26},
	journal = {Nature Communications},
	author = {Chang, Kuang-Yu and Riley, William J. and Knox, Sara H. and Jackson, Robert B. and McNicol, Gavin and Poulter, Benjamin and Aurela, Mika and Baldocchi, Dennis and Bansal, Sheel and Bohrer, Gil and Campbell, David I. and Cescatti, Alessandro and Chu, Housen and Delwiche, Kyle B. and Desai, Ankur R. and Euskirchen, Eugenie and Friborg, Thomas and Goeckede, Mathias and Helbig, Manuel and Hemes, Kyle S. and Hirano, Takashi and Iwata, Hiroki and Kang, Minseok and Keenan, Trevor and Krauss, Ken W. and Lohila, Annalea and Mammarella, Ivan and Mitra, Bhaskar and Miyata, Akira and Nilsson, Mats B. and Noormets, Asko and Oechel, Walter C. and Papale, Dario and Peichl, Matthias and Reba, Michele L. and Rinne, Janne and Runkle, Benjamin R. K. and Ryu, Youngryel and Sachs, Torsten and Schäfer, Karina V. R. and Schmid, Hans Peter and Shurpali, Narasinha and Sonnentag, Oliver and Tang, Angela C. I. and Torn, Margaret S. and Trotta, Carlo and Tuittila, Eeva-Stiina and Ueyama, Masahito and Vargas, Rodrigo and Vesala, Timo and Windham-Myers, Lisamarie and Zhang, Zhen and Zona, Donatella},
	month = dec,
	year = {2021},
	pages = {2266},
}

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