DOI: 10.5194/cp-9-1001-2013
Scopus记录号: 2-s2.0-84877984104
论文题名: Excursions to C4 vegetation recorded in the upper pleistocene loess of surduk (Northern Serbia): An organic isotope geochemistry study
作者: Hatté C. ; Gauthier C. ; Rousseau D-D. ; Antoine P. ; Fuchs M. ; Lagroix F. ; Marković S.B. ; Moine O. ; Sima A.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 3 起始页码: 1001
结束页码: 1014
语种: 英语
Scopus关键词: atmospheric circulation
; carbon isotope
; geochronology
; glacial-interglacial cycle
; loess
; meridional circulation
; organic geochemistry
; paleoclimate
; Pleistocene
; precipitation (climatology)
; westerly
; Atlantic Ocean
; Atlantic Ocean (North)
; Balkans
; Mediterranean Sea
; Russian Federation
; Serbia
英文摘要: Loess sequences have been intensively studied to characterize past glacial climates of the 40-50° north and south latitude zones. Combining different approaches of sedimentology, magnetism, geochemistry, geochronology and malacology allows the general pattern of the climate and environment of the last interglacial-glacial cycle in Eurasia and America to be characterized. Previous studies performed in Europe have highlighted the predominance (if not the sole occurrence) of C3 vegetation. The presence of C3 plants suggests a regular distribution of precipitation along the year. Therefore, even if the mean annual precipitation remained very low during the most extensive glacial times, free water was available for more than 2 months per year. Contrarily, the λ13C record of Surduk (Serbia) clearly shows the occurrence and dominance of C4 plants during at least 4 episodes of the last glacial times at 28.0-26.0 kyr cal BP, 31.4-30.0 kyr cal BP, 53.4-44.5 kyr cal BP and 86.8-66.1 kyr. The C4 plant development is interpreted as a specific atmospheric circulation pattern that induces short and dry summer conditions. As possible explanation, we propose that during "C4 episodes", the Mediterranean Sea would have been under the combined influence of the following: (i) a strong meridional circulation unfavorable to water evaporation that reduced the Mediterranean precipitation on the Balkans; and (ii) a high positive North Atlantic Western Russian (NA/WR)-like atmospheric pattern that favored northerlies over westerlies and reduced Atlantic precipitation over the Balkans. This configuration would imply very dry summers that did not allow C3 plants to grow, thus supporting C4 development. The intra-"C4 episode" periods would have occurred under less drastic oceanic and atmospheric patterns that made the influence of westerlies on the Balkans possible. © 2013 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49465
Appears in Collections: 气候变化与战略
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Recommended Citation:
Hatté C.,Gauthier C.,Rousseau D-D.,et al. Excursions to C4 vegetation recorded in the upper pleistocene loess of surduk (Northern Serbia): An organic isotope geochemistry study[J]. Climate of the Past,2013-01-01,9(3)