气候变化领域集成服务门户(CCPortal): Wind variability over the northern Indian Ocean during the past 4 million years – Insights from coarse aeolian dust (IODP exp. 359; site U1467; Maldives)

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DOI	10.1016/j.palaeo.2019.109371
	Wind variability over the northern Indian Ocean during the past 4 million years – Insights from coarse aeolian dust (IODP exp. 359; site U1467; Maldives)
	Lindhorst S.; Betzler C.; Kroon D.
发表日期	2019
ISSN	0031-0182
卷号	536
英文摘要	The lithogenic fraction of carbonate drift sediments from IODP Exp. 359 Site U1467 (Maldives) provides a unique record of atmospheric dust transport over the northern Indian Ocean during the past 4 Myr. Grain-size data provide proxies for dust flux (controlled by source area aridity) as well as wind transport capacity (wind speed). Entrainment and long-range transport of dust in the medium to coarse silt size range is linked to the strength of the Arabian Shamal winds and the occurrence of convective storms which prolong dust transport. Dust flux and the size of dust particles increased between 4.0 and 3.3 Ma, corresponding to the closure of the Indonesian seaway and the intensification of the South Asian Monsoon. There is no clear trend in dust flux between 3.3 and 1.6 Ma, whereas wind transport capacity decreased. Between 1.6 Ma and the Recent, dust flux increased and shows higher variability, especially during the last 500 kyr. Transport capacity increased between 1.2 and 0.5 Ma and slightly decreased since then. Frequency analysis shows that dust transport varies on orbital timescales, with eccentricity control being the most prominent (400 kyr throughout the record, 100 kyr between 2.0 and 1.3 Ma, and since 1.0 Ma). Higher frequency cycles (obliquity and precession) are more pronounced in wind transport capacity than in the amount of dust. This indicates that the amount of coarse dust in sediments from the Maldives as a far-field site is more prone to changes in transport mechanisms than to changes in dust source-area aridity. © 2019 Elsevier B.V.
英文关键词	Carbonate drift; Climate archive; Dust; Grain size; Shamal wind; South asian monsoon
语种	英语
scopus关键词	atmospheric transport; carbonate sediment; climate variation; dust; eolian deposit; grain size; long range transport; monsoon; paleoclimate; wind measurement; Indian Ocean; Indian Ocean (North); Maldives; South Asia
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150762
作者单位	Universität Hamburg, Zentrum für Erdsystemforschung und Nachhaltigkeit CEN, Institut für Geologie, Bundesstr. 55, Hamburg, 20146, Germany; School of GeoSciences, Grant Institute, University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh, EH9 3JW, United Kingdom
推荐引用方式 GB/T 7714	Lindhorst S.,Betzler C.,Kroon D.. Wind variability over the northern Indian Ocean during the past 4 million years – Insights from coarse aeolian dust (IODP exp. 359; site U1467; Maldives)[J],2019,536.
APA	Lindhorst S.,Betzler C.,&Kroon D..(2019).Wind variability over the northern Indian Ocean during the past 4 million years – Insights from coarse aeolian dust (IODP exp. 359; site U1467; Maldives).Palaeogeography, Palaeoclimatology, Palaeoecology,536.
MLA	Lindhorst S.,et al."Wind variability over the northern Indian Ocean during the past 4 million years – Insights from coarse aeolian dust (IODP exp. 359; site U1467; Maldives)".Palaeogeography, Palaeoclimatology, Palaeoecology 536(2019).