气候变化领域集成服务门户(CCPortal): Low terrestrial carbon storage at the Last Glacial Maximum: Constraints from multi-proxy data

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DOI	10.5194/cp-15-849-2019
	Low terrestrial carbon storage at the Last Glacial Maximum: Constraints from multi-proxy data
	Jeltsch-Thömmes A.; Battaglia G.; Cartapanis O.; Jaccard S.L.; Joos F.
发表日期	2019
ISSN	18149324
起始页码	849
结束页码	879
卷号	15 期号:2
英文摘要	Past changes in the inventory of carbon stored in vegetation and soils remain uncertain. Earlier studies inferred the increase in the land carbon inventory (Δland) between the Last Glacial Maximum (LGM) and the preindustrial period (PI) based on marine and atmospheric stable carbon isotope reconstructions, with recent estimates yielding 300-400 GtC. Surprisingly, however, earlier studies considered a mass balance for the ocean-atmosphere-land biosphere system only. Notably, these studies neglect carbon exchange with marine sediments, weathering-burial flux imbalances, and the influence of the transient deglacial reorganization on the isotopic budgets. We show this simplification to significantly reduce Δland in simulations using the Bern3D Earth System Model of Intermediate Complexity v.2.0s. We constrain Δland to ∼ 850 GtC (median estimate; 450 to 1250 GtC ±1SD) by using reconstructed changes in atmospheric δ13C, marine δ13C, deep Pacific carbonate ion concentration, and atmospheric CO2 as observational targets in a Monte Carlo ensemble with half a million members. It is highly unlikely that the land carbon inventory was larger at LGM than PI. Sensitivities of the target variables to changes in individual deglacial carbon cycle processes are established from transient factorial simulations with the Bern3D model. These are used in the Monte Carlo ensemble and provide forcing-response relationships for future model-model and model-data comparisons. Our study demonstrates the importance of ocean-sediment interactions and burial as well as weathering fluxes involving marine organic matter to explain deglacial change and suggests a major upward revision of earlier isotope-based estimates of Δland. © Author(s) 2019.
语种	英语
scopus关键词	air-soil interaction; atmosphere-biosphere interaction; atmosphere-ocean coupling; carbon cycle; carbon isotope; carbon sequestration; data set; Last Glacial Maximum; marine sediment; organic matter; paleoenvironment; terrestrial environment
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146821
作者单位	Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Institute of Geological Sciences, University of Bern, Bern, Switzerland
推荐引用方式 GB/T 7714	Jeltsch-Thömmes A.,Battaglia G.,Cartapanis O.,et al. Low terrestrial carbon storage at the Last Glacial Maximum: Constraints from multi-proxy data[J],2019,15(2).
APA	Jeltsch-Thömmes A.,Battaglia G.,Cartapanis O.,Jaccard S.L.,&Joos F..(2019).Low terrestrial carbon storage at the Last Glacial Maximum: Constraints from multi-proxy data.Climate of the Past,15(2).
MLA	Jeltsch-Thömmes A.,et al."Low terrestrial carbon storage at the Last Glacial Maximum: Constraints from multi-proxy data".Climate of the Past 15.2(2019).