气候变化领域集成服务门户(CCPortal): A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model

CCPortal

DOI	10.1029/2018MS001329
	A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model
	Morel X.; Decharme B.; Delire C.; Krinner G.; Lund M.; Hansen B.U.; Mastepanov M.
发表日期	2019
ISSN	19422466
起始页码	293
结束页码	326
卷号	11 期号:1
英文摘要	Permafrost soils and arctic wetlands methane emissions represent an important challenge for modeling the future climate. Here we present a process-based model designed to correctly represent the main thermal, hydrological, and biogeochemical processes related to these emissions for general land surface modeling. We propose a new multilayer soil carbon and gas module within the Interaction Soil-Biosphere-Atmosphere (ISBA) land-surface model (LSM). This module represents carbon pools, vertical carbon dynamics, and both oxic and anoxic organic matter decomposition. It also represents the soil gas processes for CH 4 , CO 2 , and O 2 through the soil column. We base CH 4 production and oxydation on an O 2 control instead of the classical water table level strata approach used in state-of-the-art soil CH 4 models. We propose a new parametrization of CH 4 oxydation using recent field experiments and use an explicit O 2 limitation for soil carbon decomposition. Soil gas transport is computed explicitly, using a revisited formulation of plant-mediated transport, a new representation of gas bulk diffusivity in porous media closer to experimental observations, and an innovative advection term for ebullition. We evaluate this advanced model on three climatically distinct sites : two in Greenland (Nuuk and Zackenberg) and one in Siberia (Chokurdakh). The model realistically reproduces methane and carbon dioxide emissions from both permafrosted and nonpermafrosted sites. The evolution and vertical characteristics of the underground processes leading to these fluxes are consistent with current knowledge. Results also show that physics is the main driver of methane fluxes, and the main source of variability appears to be the water table depth. © 2018. The Authors.
英文关键词	arctic ecosystem; carbon cycling; methane emission; modeling
语种	英语
scopus关键词	Biogeochemistry; Carbon dioxide; Climate models; Global warming; Groundwater; Methane; Models; Permafrost; Porous materials; Surface measurement; Biogeochemical process; Carbon cycling; Carbon dioxide emissions; Land surface modeling; Methane emissions; Organic matter decomposition; Process-based modeling; Vertical characteristics; Soil surveys; air-soil interaction; arctic environment; atmosphere-biosphere interaction; carbon cycle; carbon emission; carbon flux; field method; methane; modeling; permafrost; soil carbon; soil gas; Arctic; Chokurdakh; Greenland; Nuuk; Russian Federation; Sakha; Zackenberg
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156984
作者单位	CNRM UMR 3589, Meteo-France/CNRS, Toulouse, France; Laboratoire de Glaciologie et Geophysique de l'Environnement, Grenoble, France; Department of Bioscience, Arctic Research Centre, Aarhus University, Roskilde, Denmark; Center for Permafrost, Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark; Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
推荐引用方式 GB/T 7714	Morel X.,Decharme B.,Delire C.,et al. A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model[J],2019,11(1).
APA	Morel X..,Decharme B..,Delire C..,Krinner G..,Lund M..,...&Mastepanov M..(2019).A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model.Journal of Advances in Modeling Earth Systems,11(1).
MLA	Morel X.,et al."A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model".Journal of Advances in Modeling Earth Systems 11.1(2019).