干旱区生态环境知识资源中心(Arid): Intersections between wind regimes, topography and sediment supply: Perspectives from aeolian landforms in Central Asia

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DOI	10.1016/j.palaeo.2019.109531
	Intersections between wind regimes, topography and sediment supply: Perspectives from aeolian landforms in Central Asia
	Fitzsimmons, Kathryn E.1; Nowatzki, Maike 1,2; Dave, Aditi K.1; Harder, Hartwig 3
通讯作者	Fitzsimmons, Kathryn E.
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2020
卷号	540
英文摘要	The widespread aeolian deposits of the Central Asian steppes and piedmonts offer potential to better understand the dynamics of the major Eurasian climate subsystems over Quaternary timescales. However, current assumptions linking climate processes with aeolian activity remain poorly substantiated and potentially problematic: emerging datasets suggest that loess accumulation rates, and the timing of peak dust flux along the Tien Shan piedmont, are highly variable between sites; the degree to which desert dunes reflect wind regimes and therefore provide records of climate circulation is unknown; and the presumed genetic link between the region's desert dunes and piedmont loess deposits remains hypothetical. These uncertainties raise questions as to the nature of the relationship between aeolian flux, deposition and (palaeo)climate. Here we investigate the relationship between wind regimes and the distribution, morphology and timing of two aeolian landform types (dunes and loess) in the topographically diverse Ili Basin of southeast Kazakhstan and western China. We establish late Holocene ages for three dune sites and one loess profile and infer that the location and morphology of these landforms can be used to test their genetic link with recent wind regimes. We assess the morphologic characteristics of linear dunes at four sites using a semi-automated mapping approach, and analyse the variability in dune orientations with respect to sand-shifting wind trajectories identified from meteorological reanalysis data for each site. The most frequently occurring wind direction appears to be responsible for sediment supply, while the strongest winds drive dune orientation. Wind orientations are strongly influenced by topography. Back trajectories incorporating dust transport and deposition potential to the loess site suggest both westerly and northerly delivery of fine-grained material to the piedmont, and that the most common source areas lie in regions where surface sediment contains a mixture of coarse and fine-grained material to facilitate entrainment into suspension.
英文关键词	Desert dunes Loess Dust transport pathways Ili Basin Geographic object-based image analysis (GEOBIA)
类型	Article
语种	英语
国家	Germany
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000513290300017
WOS关键词	EARTHWORM CALCITE GRANULES ; DISPERSION MODEL FLEXPART ; LATE PLEISTOCENE ; CLIMATE-CHANGE ; SINGLE-ALIQUOT ; LUMINESCENCE ; DUNES ; DESERT ; VARIABILITY ; EVOLUTION
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向	Physical Geography ; Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315273
作者单位	1.Max Planck Inst Chem, Res Grp Terr Palaeoclimates, Hahn Meitner Weg 1, D-55128 Mainz, Germany; 2.Eberhard Karls Univ Tubingen, Dept Geog, Rumelinstr 19-23, D-72070 Tubingen, Germany; 3.Max Planck Inst Chem, Dept Atmospher Chem, Hahn Meitner Weg 1, D-55128 Mainz, Germany
推荐引用方式 GB/T 7714	Fitzsimmons, Kathryn E.,Nowatzki, Maike,Dave, Aditi K.,et al. Intersections between wind regimes, topography and sediment supply: Perspectives from aeolian landforms in Central Asia[J],2020,540.
APA	Fitzsimmons, Kathryn E.,Nowatzki, Maike,Dave, Aditi K.,&Harder, Hartwig.(2020).Intersections between wind regimes, topography and sediment supply: Perspectives from aeolian landforms in Central Asia.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,540.
MLA	Fitzsimmons, Kathryn E.,et al."Intersections between wind regimes, topography and sediment supply: Perspectives from aeolian landforms in Central Asia".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 540(2020).