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Toward more realistic projections of soil carbon dynamics by Earth system models


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dc.contributorHanqin Tian, tianhan@auburn.eduen_US
dc.creatorLuo, Yiqi
dc.creatorAhlstrom, Anders
dc.creatorAllison, Steven D.
dc.creatorBatjes, Niles H.
dc.creatorBrovkin, Victor
dc.creatorCarvalhais, Nuno
dc.creatorChappell, Adrian
dc.creatorCiais, Philippe
dc.creatorDavidson, Eric A.
dc.creatorFinzi, Adrien C.
dc.creatorGeorgiou, Katerina
dc.creatorGuenet, Bertrand
dc.creatorHararuk, Oleksandra
dc.creatorHarden, Jennifer W.
dc.creatorHe, Yujie
dc.creatorHopkins, Francesca
dc.creatorJiang, Lifen
dc.creatorKoven, Charlie
dc.creatorJackson, Robert B.
dc.creatorJones, Chris D.
dc.creatorLara, Mark J.
dc.creatorLiang, Junyi
dc.creatorMcGuire, A. David
dc.creatorParton, William
dc.creatorPeng, Changhui
dc.creatorRanderson, James T.
dc.creatorSalazar, Alejandro
dc.creatorSierra, Carlos A.
dc.creatorSmith, Mathew J.
dc.creatorTian, Hanqin
dc.creatorTodd-Brown, Katherine E.O.
dc.creatorTorn, Margaret
dc.creatorvan Groenigen, Kees Jan
dc.creatorWang, Ying Ping
dc.creatorWest, Tristram O.
dc.creatorWei, Yaxing
dc.creatorWieder, William R
dc.creatorXia, Jianyang
dc.creatorXu, Xia
dc.creatorXu, Xiaofeng
dc.creatorZhou, Tao
dc.date.accessioned2022-03-03T16:06:30Z
dc.date.available2022-03-03T16:06:30Z
dc.date.created2016-01
dc.identifier10.1002/2015GB005239en_US
dc.identifier.urihttps://agupubs-onlinelibrary-wiley-com.spot.lib.auburn.edu/doi/full/10.1002/2015GB005239en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50030
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-99
dc.description.abstractSoil carbon (C) is a critical component of Earth system models (ESMs), and its diverse representations are a major source of the large spread across models in the terrestrial C sink from the third to fifth assessment reports of the Intergovernmental Panel on Climate Change (IPCC). Improving soil C projections is of a high priority for Earth system modeling in the future IPCC and other assessments. To achieve this goal, we suggest that (1) model structures should reflect real-world processes, (2) parameters should be calibrated to match model outputs with observations, and (3) external forcing variables should accurately prescribe the environmental conditions that soils experience. First, most soil C cycle models simulate C input from litter production and C release through decomposition. The latter process has traditionally been represented by first-order decay functions, regulated primarily by temperature, moisture, litter quality, and soil texture. While this formulation well captures macroscopic soil organic C (SOC) dynamics, better understanding is needed of their underlying mechanisms as related to microbial processes, depth-dependent environmental controls, and other processes that strongly affect soil C dynamics. Second, incomplete use of observations in model parameterization is a major cause of bias in soil C projections from ESMs. Optimal parameter calibration with both pool-and flux-based data sets through data assimilation is among the highest priorities for near-term research to reduce biases among ESMs. Third, external variables are represented inconsistently among ESMs, leading to differences in modeled soil C dynamics. We recommend the implementation of traceability analyses to identify how external variables and model parameterizations influence SOC dynamics in different ESMs. Overall, projections of the terrestrial C sink can be substantially improved when reliable data sets are available to select the most representative model structure, constrain parameters, and prescribe forcing fields.en_US
dc.formatPDFen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.ispartofGLOBAL BIOGEOCHEMICAL CYCLESen_US
dc.relation.ispartofseries0886-6236en_US
dc.rights©American Geophysical Union 2016. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Luo, Y., Ahlström, A., Allison, S. D., Batjes, N. H., Brovkin, V., Carvalhais, N., ... & Zhou, T. (2016). Toward more realistic projections of soil carbon dynamics by Earth system models. Global Biogeochemical Cycles, 30(1), 40-56.en_US
dc.subjectGLOBAL CLIMATE-CHANGEen_US
dc.subjectORGANIC-CARBONen_US
dc.subjectDATA-ASSIMILATIONen_US
dc.subjectHETEROTROPHIC RESPIRATIONen_US
dc.subjectTEMPERATURE SENSITIVITYen_US
dc.subjectTERRESTRIAL ECOSYSTEMSen_US
dc.subjectLITTER DECOMPOSITIONen_US
dc.subjectPARAMETER-ESTIMATIONen_US
dc.subjectMICROBIAL MODELSen_US
dc.subjectLAND MODELSen_US
dc.titleToward more realistic projections of soil carbon dynamics by Earth system modelsen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume30en_US
dc.citation.issue1en_US
dc.citation.spage40en_US
dc.citation.epage56en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-1806-4091en_US
dc.contributor.departmentSchool of Forestry and Wildlife Sciencesen_US

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