气候变化领域集成服务门户(CCPortal): Evaluation of simulated soil carbon dynamics in Arctic-Boreal ecosystems

CCPortal

DOI	10.1088/1748-9326/ab6784
	Evaluation of simulated soil carbon dynamics in Arctic-Boreal ecosystems
	Huntzinger D.N.; Schaefer K.; Schwalm C.; Fisher J.B.; Hayes D.; Stofferahn E.; Carey J.; Michalak A.M.; Wei Y.; Jain A.K.; Kolus H.; Mao J.; Poulter B.; Shi X.; Tang J.; Tian H.
发表日期	2020
ISSN	17489318
卷号	15 期号:2
英文摘要	Given the magnitude of soil carbon stocks in northern ecosystems, and the vulnerability of these stocks to climate warming, land surface models must accurately represent soil carbon dynamics in these regions. We evaluate soil carbon stocks and turnover rates, and the relationship between soil carbon loss with soil temperature and moisture, from an ensemble of eleven global land surface models. We focus on the region of NASA's Arctic-Boreal vulnerability experiment (ABoVE) in North America to inform data collection and model development efforts. Models exhibit an order of magnitude difference in estimates of current total soil carbon stocks, generally under-or overestimating the size of current soil carbon stocks by greater than 50 PgC. We find that a model's soil carbon stock at steady-state in 1901 is the prime driver of its soil carbon stock a hundred years later-overwhelming the effect of environmental forcing factors like climate. The greatest divergence between modeled and observed soil carbon stocks is in regions dominated by peat and permafrost soils, suggesting that models are failing to capture the frozen soil carbon dynamics of permafrost regions. Using a set of functional benchmarks to test the simulated relationship of soil respiration to both soil temperature and moisture, we find that although models capture the observed shape of the soil moisture response of respiration, almost half of the models examined show temperature sensitivities, or Q10 values, that are half of observed. Significantly, models that perform better against observational constraints of respiration or carbon stock size do not necessarily perform well in terms of their functional response to key climatic factors like changing temperature. This suggests that models may be arriving at the right result, but for the wrong reason. The results of this work can help to bridge the gap between data and models by both pointing to the need to constrain initial carbon pool sizes, as well as highlighting the importance of incorporating functional benchmarks into ongoing, mechanistic modeling activities such as those included in ABoVE. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Arctic-Boreal; functional benchmark; soil carbon; soil respiration; terrestrial carbon cycle
语种	英语
scopus关键词	Carbon; Dynamics; Ecosystems; Forestry; NASA; Permafrost; Soil moisture; Surface measurement; Temperature; Arctic-Boreal; Changing temperature; Environmental forcing; Soil carbon; Soil carbon dynamics; Soil respiration; Temperature sensitivity; Terrestrial carbon cycle; Climate models; arctic environment; benchmarking; Boreal Kingdom; carbon cycle; carbon sequestration; estimation method; experimental study; frozen ground; simulation; soil carbon; soil moisture; soil respiration; turnover; North America
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154104
作者单位	School of Earth and Sustainability, Northern Arizona University, PO Box 5694, Flagstaff, AZ, United States; National Snow and Ice Data Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; Woods Hole Research Center, Falmouth, MA, United States; Center for Ecosystems and Society, Northern Arizona University, Flagstaff, AZ, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; School of Forest Resources, University of Maine, Orono, ME, United States; Math and Science, Babson College, Babson Park, MA, United States; Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, United States; Environmental Sciences Division, Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States; Department of Atmospheric Sciences, University of Illinois, Urbana, IL, United States; National Aeronautics and Space Administration (NASA), Biospheric...
推荐引用方式 GB/T 7714	Huntzinger D.N.,Schaefer K.,Schwalm C.,et al. Evaluation of simulated soil carbon dynamics in Arctic-Boreal ecosystems[J],2020,15(2).
APA	Huntzinger D.N..,Schaefer K..,Schwalm C..,Fisher J.B..,Hayes D..,...&Tian H..(2020).Evaluation of simulated soil carbon dynamics in Arctic-Boreal ecosystems.Environmental Research Letters,15(2).
MLA	Huntzinger D.N.,et al."Evaluation of simulated soil carbon dynamics in Arctic-Boreal ecosystems".Environmental Research Letters 15.2(2020).