DOI: 10.5194/cp-14-239-2018
Scopus记录号: 2-s2.0-85042850204
论文题名: Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials
作者: Bouttes N. ; Swingedouw D. ; Roche D.M. ; Sanchez-Goni M.F. ; Crosta X.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2018
卷: 14, 期: 2 起始页码: 239
结束页码: 253
语种: 英语
Scopus关键词: Brunhes chron
; carbon cycle
; carbon dioxide
; carbon sequestration
; climate conditions
; complexity
; ice sheet
; interglacial
; model
; oceanic circulation
; orbital forcing
; paleoclimate
; temperature
; vegetation cover
英文摘要: Atmospheric CO2 levels during interglacials prior to the Mid-Brunhes Event (MBE, ĝ1/4 ĝ€-430ĝ€-kaĝ€†BP) were around 40ĝ€-ppm lower than after the MBE. The reasons for this difference remain unclear. A recent hypothesis proposed that changes in oceanic circulation, in response to different external forcings before and after the MBE, might have increased the ocean carbon storage in pre-MBE interglacials, thus lowering atmospheric CO2. Nevertheless, no quantitative estimate of this hypothesis has been produced up to now. Here we use an intermediate complexity model including the carbon cycle to evaluate the response of the carbon reservoirs in the atmosphere, ocean and land in response to the changes of orbital forcings, ice sheet configurations and atmospheric CO2 concentrations over the last nine interglacials. We show that the ocean takes up more carbon during pre-MBE interglacials in agreement with data, but the impact on atmospheric CO2 is limited to a few parts per million. Terrestrial biosphere is simulated to be less developed in pre-MBE interglacials, which reduces the storage of carbon on land and increases atmospheric CO2. Accounting for different simulated ice sheet extents modifies the vegetation cover and temperature, and thus the carbon reservoir distribution. Overall, atmospheric CO2 levels are lower during these pre-MBE simulated interglacials including all these effects, but the magnitude is still far too small. These results suggest a possible misrepresentation of some key processes in the model, such as the magnitude of ocean circulation changes, or the lack of crucial mechanisms or internal feedbacks, such as those related to permafrost, to fully account for the lower atmospheric CO2 concentrations during pre-MBE interglacials. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109590
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Univ. Bordeaux, EPOC, UMR 5805, Pessac, 33615, France; Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, 91191, France; Earth and Climate Cluster, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, Netherlands; EPHE, PSL Research University, Pessac, 33615, France
Recommended Citation:
Bouttes N.,Swingedouw D.,Roche D.M.,et al. Response of the carbon cycle in an intermediate complexity model to the different climate configurations of the last nine interglacials[J]. Climate of the Past,2018-01-01,14(2)