Historically inconsistent productivity and respiration fluxes in the global terrestrial carbon cycle
| dc.contributor.author | Jian, Jinshi | en |
| dc.contributor.author | Bailey, Vanessa | en |
| dc.contributor.author | Dorheim, Kalyn | en |
| dc.contributor.author | Konings, Alexandra G. | en |
| dc.contributor.author | Hao, Dalei | en |
| dc.contributor.author | Shiklomanov, Alexey N. | en |
| dc.contributor.author | Snyder, Abigail | en |
| dc.contributor.author | Steele, Meredith | en |
| dc.contributor.author | Teramoto, Munemasa | en |
| dc.contributor.author | Vargas, Rodrigo | en |
| dc.contributor.author | Bond-Lamberty, Ben | en |
| dc.date.accessioned | 2022-04-04T12:13:29Z | en |
| dc.date.available | 2022-04-04T12:13:29Z | en |
| dc.date.issued | 2022-04-01 | en |
| dc.description.abstract | The terrestrial carbon cycle is a major source of uncertainty in climate projections. Its dominant fluxes, gross primary productivity (GPP), and respiration (in particular soil respiration, RS), are typically estimated from independent satellite-driven models and upscaled in situ measurements, respectively. We combine carbon-cycle flux estimates and partitioning coefficients to show that historical estimates of global GPP and RS are irreconcilable. When we estimate GPP based on RS measurements and some assumptions about RS:GPP ratios, we found the resulted global GPP values (bootstrap mean 149+29−23 Pg C yr−1) are significantly higher than most GPP estimates reported in the literature (113+18−18 Pg C yr−1). Similarly, historical GPP estimates imply a soil respiration flux (RsGPP, bootstrap mean of 68+10−8 Pg C yr−1) statistically inconsistent with most published RS values (87+9−8 Pg C yr−1), although recent, higher, GPP estimates are narrowing this gap. Furthermore, global RS:GPP ratios are inconsistent with spatial averages of this ratio calculated from individual sites as well as CMIP6 model results. This discrepancy has implications for our understanding of carbon turnover times and the terrestrial sensitivity to climate change. Future efforts should reconcile the discrepancies associated with calculations for GPP and Rs to improve estimates of the global carbon budget. | en |
| dc.description.sponsorship | This research was supported by the second Tibetan Plateau Scientific Expedition and Research Program (STEP) (No. 2019QZKK0603), the Strategic Priority Research 482 Program of the Chinese Academy of Sciences (No. XDA20040202), and the Pacific Northwest National Laboratory is operated for the US Department of Energy, Office of Science, Biological and Environmental Research as part of the Terrestrial Ecosystem Sciences Program by Battelle Memorial Institute under contract DE-AC05-76RL01830. R.V. was supported by the NASA Carbon Monitoring System 80NSSC18K0179. A.G.K. was supported by NASA NNH16ZDA001N-IDS and by NSF DEB-1942133. This work used eddy covariance data acquired and shared by the FLUXNET community (see Methods). | en |
| dc.description.version | Published version | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.doi | https://doi.org/10.1038/s41467-022-29391-5 | en |
| dc.identifier.uri | http://hdl.handle.net/10919/109529 | en |
| dc.identifier.volume | 13 | en |
| dc.language.iso | en | en |
| dc.publisher | Springer Nature | en |
| dc.rights | Creative Commons Attribution 4.0 International | en |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en |
| dc.title | Historically inconsistent productivity and respiration fluxes in the global terrestrial carbon cycle | en |
| dc.title.serial | Nature Communications | en |
| dc.type | Article - Refereed | en |
| dc.type.dcmitype | Text | en |