DOI: 10.1016/j.quascirev.2013.02.003
Scopus记录号: 2-s2.0-84875279590
论文题名: Stomatal proxy record of CO2 concentrations from the last termination suggests an important role for CO2 at climate change transitions
作者: Steinthorsdottir M. ; Wohlfarth B. ; Kylander M.E. ; Blaauw M. ; Reimer P.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 68 起始页码: 43
结束页码: 58
语种: 英语
英文关键词: Betula nana
; Last termination/Lateglacial climate
; Palaeo-CO2 reconstruction
; Stomatal proxy method
; Sweden
Scopus关键词: Betula nana
; Last termination/Lateglacial climate
; Loss-on-ignition
; Ocean circulation
; Sedimentary sequence
; Stomatal proxy method
; Sweden
; Younger Dryas
; Climate change
; Carbon dioxide
; air bubble
; carbon dioxide
; climate forcing
; climate variation
; concentration (composition)
; deciduous tree
; Holocene
; late glacial
; paleoclimate
; palynology
; proxy climate record
; sedimentary sequence
; stomata
; Sweden
英文摘要: A new stomatal proxy-based record of CO2 concentrations ([CO2]), based on Betula nana (dwarf birch) leaves from the Hässeldala Port sedimentary sequence in south-eastern Sweden, is presented. The record is of high chronological resolution and spans most of Greenland Interstadial 1 (GI-1a to 1c, Allerød pollen zone), Greenland Stadial 1 (GS-1, Younger Dryas pollen zone) and the very beginning of the Holocene (Preboreal pollen zone). The record clearly demonstrates that i) [CO2] were significantly higher than usually reported for the Last Termination and ii) the overall pattern of CO2 evolution through the studied time period is fairly dynamic, with significant abrupt fluctuations in [CO2] when the climate moved from interstadial to stadial state and vice versa. A new loss-on-ignition chemical record (used here as a proxy for temperature) lends independent support to the Hässeldala Port [CO2] record. The large-amplitude fluctuations around the climate change transitions may indicate unstable climates and that " tipping-point" situations were involved in Last Termination climate evolution. The scenario presented here is in contrast to [CO2] records reconstructed from air bubbles trapped in ice, which indicate lower concentrations and a gradual, linear increase of [CO2] through time. The prevalent explanation for the main climate forcer during the Last Termination being ocean circulation patterns needs to re-examined, and a larger role for atmospheric [CO2] considered. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60655
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geological Sciences, Bolin Centre for Climate Research, Stockholm University, SE 109 61 Stockholm, Sweden; School of Geography Archaeology and Palaeoecology, Queen's University Belfast, Belfast BT7 1NN, Northern Ireland, United Kingdom
Recommended Citation:
Steinthorsdottir M.,Wohlfarth B.,Kylander M.E.,et al. Stomatal proxy record of CO2 concentrations from the last termination suggests an important role for CO2 at climate change transitions[J]. Quaternary Science Reviews,2013-01-01,68