DOI: 10.1016/j.quascirev.2013.10.013
Scopus记录号: 2-s2.0-84887193427
论文题名: NW African hydrology and vegetation during the Last Glacial cycle reflected in plant-wax-specific hydrogen and carbon isotopes
作者: Kuechler R.R. ; Schefuß E. ; Beckmann B. ; Dupont L. ; Wefer G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 82 起始页码: 56
结束页码: 67
语种: 英语
英文关键词: Hydrology
; Isotopes
; Major element ratios
; Marine sediments
; NW Africa
; Plant leaf waxes
; Sea surface temperatures
; Vegetation
Scopus关键词: Major elements
; Marine sediments
; Nw africa
; Plant leaf
; Sea surface temperature (SST)
; Carbon
; Glacial geology
; Hydrogen
; Hydrology
; Incident solar radiation
; Oceanography
; Submarine geology
; Vegetation
; Isotopes
; alkane
; biome
; carbon isotope
; hydrogen isotope
; hydrology
; Last Glacial Maximum
; Northern Hemisphere
; reconstruction
; sea surface temperature
; vegetation cover
; vegetation structure
; water stress
; weathering
; Sahara
; Sahel [Sub-Saharan Africa]
英文摘要: We present a hydrologic reconstruction of the Sahara-Sahel transition, covering the complete Last Glacial cycle (130ka), based on a combination of plant-wax-specific hydrogen (δD) and carbon isotopes (δ13C). The δD and δ13C signatures of long-chain n-alkanes from ODP Site 659 off NW Africa reveal a significant anti-correlation. Complementary to published pollen data, we infer that this plant-wax signal reflects sensitive responses of the vegetation cover to precipitation changes in the Sahel region, as well as varying contributions from biomes north of the Sahara (C3 domain) by North-East Trade Winds (NETW). During arid phases, especially the northern parts of the Sahel likely experienced crucial water stress, which resulted in a pronounced contraction of the vegetation cover, thus reducing the amount of C4 plant waxes from the region. The increase in NETW strength during dry periods further promoted a more pronounced C3-plant-wax signal derived from the North African C3 plant domain. During humid periods, the C4-dominated Sahelian environments spread northward into the Saharan realm, in association with lower NETW inputs of C3 plant waxes. Arid-humid cycles deduced from plant-wax δD are in accordance with concomitant changes in weathering intensity reflected in varying major element distributions. Environmental shifts are generally linked to periods with large fluctuations in Northern Hemisphere summer insolation. During Marine Isotope Stages 2 and 3, when insolation variability was low, coupling of the hydrologic regime to alkenone-based estimates of NE Atlantic sea-surface temperatures becomes apparent. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60432
Appears in Collections: 过去全球变化的重建
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作者单位: MARUM - Center for Marine Environmental Sciences, University of Bremen, Leobener Str., 28359 Bremen, Germany
Recommended Citation:
Kuechler R.R.,Schefuß E.,Beckmann B.,et al. NW African hydrology and vegetation during the Last Glacial cycle reflected in plant-wax-specific hydrogen and carbon isotopes[J]. Quaternary Science Reviews,2013-01-01,82