DOI: 10.1016/j.epsl.2017.10.001
Scopus记录号: 2-s2.0-85040323960
论文题名: Early-Holocene greening of the Afro-Asian dust belt changed sources of mineral dust in West Asia
作者: Sharifi A. ; Murphy L.N. ; Pourmand A. ; Clement A.C. ; Canuel E.A. ; Naderi Beni A. ; A.K. Lahijani H. ; Delanghe D. ; Ahmady-Birgani H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 481 起始页码: 30
结束页码: 40
语种: 英语
英文关键词: atmospheric circulation
; dust provenance
; Holocene of Iran
; Paleo-dust
; Sr–Hf–Nd isotopes
; West Asia
Scopus关键词: Climatology
; Earth (planet)
; Exploratory geochemistry
; Geochemistry
; Grain size and shape
; Hafnium
; Isotopes
; Meteorology
; Minerals
; Neodymium
; Orbits
; Strontium
; Atmospheric circulation
; Composition of minerals
; Geochemical fingerprints
; Holocenes
; Mineralogical compositions
; Nd isotopes
; Orbital configuration
; West Asia
; Dust
; atmospheric circulation
; dust
; hafnium
; Holocene
; neodymium isotope
; provenance
; strontium isotope
; Iran
; West Asia
英文摘要: Production, transport and deposition of mineral dust have significant impacts on different components of the Earth systems through time and space. In modern times, dust plumes are associated with their source region(s) using satellite and land-based measurements and trajectory analysis of air masses through time. Reconstruction of past changes in the sources of mineral dust as related to changes in climate, however, must rely on the knowledge of the geochemical and mineralogical composition of modern and paleo-dust, and that of their potential source origins. In this contribution, we present a 13,000-yr record of variations in radiogenic Sr–Nd–Hf isotopes and Rare Earth Element (REE) anomalies as well as dust grain size from an ombrotrophic (rain fed) peat core in NW Iran as proxies of past changes in the sources of dust over the interior of West Asia. Our data shows that although the grain size of dust varies in a narrow range through the entire record, the geochemical fingerprint of dust particles deposited during the low-flux, early Holocene period (11,700–6,000 yr BP) is distinctly different from aerosols deposited during high dust flux periods of the Younger Dryas and the mid-late Holocene (6,000–present). Our findings indicate that the composition of mineral dust deposited at the study site changed as a function of prevailing atmospheric circulation regimes and land exposure throughout the last deglacial period and the Holocene. Simulations of atmospheric circulation over the region show the Northern Hemisphere Summer Westerly Jet was displaced poleward across the study area during the early Holocene when Northern Hemisphere insolation was higher due to the Earth's orbital configuration. This shift, coupled with lower dust emissions simulated based on greening of the Afro-Asian Dust Belt during the early Holocene likely led to potential sources in Central Asia dominating dust export to West Asia during this period. In contrast, the dominant western and southwest Asian and Eastern African sources have prevailed during the mid-Holocene to modern times. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110177
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Neptune Isotope Laboratory (NIL), Department of Marine Geosciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149-1098, United States; Rosenstiel School of Marine and Atmospheric Science (RSMAS), University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149-1098, United States; Virginia Institute of Marine Science, College of William & Mary, P.O. Box 1346, Gloucester Point, VA, United States; Iranian National Institute for Oceanography and Atmospheric Science (INIOAS), Marine Geology Division, P.O. Box 14155-4781, Tehran, Iran; Aix Marseille Univ., CNRS, IRD, Coll France, CEREGE, Europôle de l'Arbois, Aix en Provence, France; Faculty of Natural Resources, Urmia University, Urmia, Iran
Recommended Citation:
Sharifi A.,Murphy L.N.,Pourmand A.,et al. Early-Holocene greening of the Afro-Asian dust belt changed sources of mineral dust in West Asia[J]. Earth and Planetary Science Letters,2018-01-01,481