DOI: 10.1002/grl.50740
论文题名: Ti content in Huguangyan maar lake sediment as a proxy for monsoon-induced vegetation density in the Holocene
作者: Shen J. ; Wu X. ; Zhang Z. ; Gong W. ; He T. ; Xu X. ; Dong H.
刊名: Geophysical Research Letters
ISSN: 0094-8389
EISSN: 1944-8120
出版年: 2013
卷: 40, 期: 21 起始页码: 5757
结束页码: 5763
语种: 英语
英文关键词: Huguangyan
; Ti content
; vegetation
Scopus关键词: Asian winter monsoons
; Chemical compositions
; Chinese Loess Plateau
; Huguangyan
; Inverse correlation
; Morphological features
; Ti content
; Total Organic Carbon
; Atmospheric thermodynamics
; Catchments
; Erosion
; Lakes
; Magnetite
; Sedimentology
; Sediments
; Vegetation
; Titanium
; chemical environmental conditions
; eolian deposit
; erosion
; geomorphology
; Holocene
; lacustrine deposit
; mineral
; monsoon
; proxy climate record
; sediment chemistry
; titanium
; total organic carbon
; vegetation structure
; China
; Guangdong
; Huguangyan Lake
; Loess Plateau
英文摘要: The provenance of element Ti in Huguangyan maar lake (HGY) sediment has been under debate since Yancheva et al. () proposed its eolian source from the Chinese Loess Plateau (CLP) and applied it as a proxy for Asian winter monsoon. We performed a comprehensive study on Ti-carrying minerals and Ti fluxes in lake sediments, wall rocks, and loess from the CLP. Here we show that the chemical compositions and morphological features of magnetite, the most important Ti carrier in HGY surface sediments, are identical to those in wall rocks around the lake, but substantially different from those in CLP loess samples. Our calculated modern eolian Ti flux from the CLP is negligible compared to the average total Ti flux to HGY, and Ti flux from catchment erosion can provide enough Ti, indicating Ti in HGY sediment are predominantly from wall rock erosion. Inverse correlation between total organic carbon (TOC) (vegetation density) and Ti/Ca ratio (terrestrial input) in the Holocene suggests monsoon-induced vegetation density predominates over runoff in controlling Ti input to HGY. S-ratio represents TOC directly mediated reductive diagenesis of iron oxides (magnetite preservation), rather than anoxic/oxic condition at the bottom water induced by winter monsoon. Our record shows a decreased vegetation density, increased Ti input and weakened reductive diagenesis through the Holocene driven by a weakened summer monsoon. Key Points Ti in HGY sediment are predominantly from wall rock erosion monsoon induced vegetation density controlls Ti input to HGY Decreased vegetation density, increased Ti input through the Holocene ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887038175&doi=10.1002%2fgrl.50740&partnerID=40&md5=19efb576a7b495ab0372bf5cdbb5332c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5653
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China
Recommended Citation:
Shen J.,Wu X.,Zhang Z.,et al. Ti content in Huguangyan maar lake sediment as a proxy for monsoon-induced vegetation density in the Holocene[J]. Geophysical Research Letters,2013-01-01,40(21).