DOI: 10.5194/cp-10-759-2014
Scopus记录号: 2-s2.0-84898871201
论文题名: A seasonality trigger for carbon injection at the Paleocene-Eocene Thermal Maximum
作者: Eldrett J.S. ; Greenwood D.R. ; Polling M. ; Brinkhuis H. ; Sluijs A.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 2 起始页码: 759
结束页码: 769
语种: 英语
Scopus关键词: carbon isotope
; colonization
; epiphyte
; fern
; Hypsithermal
; Paleocene-Eocene boundary
; paleoclimate
; palynology
; seasonality
; spore
; Atlantic Ocean
; North Sea
英文摘要: The Paleocene-Eocene Thermal Maximum (PETM) represents a ~170 kyr episode of anomalous global warmth ~56 Ma ago. The PETM is associated with rapid and massive injections of 13C-depleted carbon into the ocean-atmosphere system reflected as a prominent negative carbon isotope excursion (CIE) in sedimentary components. Earth's surface and deep ocean waters warmed by ~5 °C, of which part may have occurred prior to the CIE. However, few records document continental climatic trends and changes in seasonality have not been documented. Here we present the first high-resolution vegetation and paleoclimate reconstructions for the PETM, based on nearest living relative analysis of terrestrially derived spore and pollen assemblages preserved in an expanded section from the central North Sea. Our data indicate reductions in boreal conifers and an increase in mesothermal to megathermal taxa, reflecting a shift towards wetter and warmer climate. We also record an increase in summer temperatures, greater in magnitude than the rise in mean annual temperature changes, and a shift to a summer-wet seasonality. Within the CIE, vegetation varies significantly with initial increases in epiphytic and climbing ferns, and development of extensive wetlands, followed by abundance of Carya spp. indicative of broadleaf forest colonization. Critically, the change in vegetation we report occurs prior to the CIE, and is concomitant with anomalous marine ecological change, as represented by the occurrence of Apectodinium augustum. This suggests that amplifications of seasonal extremes triggered carbon injection. © Author(s) 2014. 资助项目: ERC, Natural Sciences and Engineering Research Council of Canada
; NSERC, Natural Sciences and Engineering Research Council of Canada
; UU, Natural Sciences and Engineering Research Council of Canada
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49282
Appears in Collections: 气候变化与战略
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Recommended Citation:
Eldrett J.S.,Greenwood D.R.,Polling M.,et al. A seasonality trigger for carbon injection at the Paleocene-Eocene Thermal Maximum[J]. Climate of the Past,2014-01-01,10(2)