DOI: 10.1016/j.quascirev.2016.05.010
Scopus记录号: 2-s2.0-84969799584
论文题名: Late Holocene vegetation and ocean variability in the Gulf of Oman
作者: Miller C.S. ; Leroy S.A.G. ; Collins P.E.F. ; Lahijani H.A.K.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 143 起始页码: 120
结束页码: 132
语种: 英语
英文关键词: Dinoflagellates
; Gulf of Oman
; Iran
; Little Ice Age
; Medieval Climate Anomaly
; Pollen
; Sassanid period
Scopus关键词: Atmospheric thermodynamics
; Glacial geology
; Landforms
; Oceanography
; Water
; Dinoflagellates
; Gulf of Oman
; Iran
; Little Ice Age
; Medieval climate anomalies
; Pollen
; Sassanid period
; Vegetation
; climate conditions
; climate variation
; coniferous tree
; dinoflagellate
; fossil record
; grass
; herb
; Little Ice Age
; Medieval Warm Period
; paleoclimate
; paleoenvironment
; pollen
; proxy climate record
; savanna
; sediment core
; shrub
; vegetation dynamics
; Arabian Sea
; Gulf of Oman
; Indian Ocean
; Iran
; Amaranthaceae
; Asteraceae
; Caryophyllaceae
; Centaurea
; Cyperaceae
; Dinophyceae
; Impagidinium
; Poaceae
; Spiniferites ramosus
英文摘要: Fossil pollen and dinocyst records in marine sequences are frequently combined to reveal the response of vegetation and ocean conditions to changes in both regional and global climate. In this study we analysed pollen and dinocysts within a clearly-laminated sediment core off the Iranian coast in the Gulf of Oman, an extremely data-poor area, to reconstruct climatic change during the Late Holocene (last 1900 years). The vegetation record from southern Iran indicates a replacement of savannah by desert formations at c. 910 CE, shortly after the Islamic invasion and the subsequent collapse of the Sassanid Empire. From c. 910 to 1145 CE, during the Medieval Climate Anomaly (MCA), the vegetation was heavily dominated by desert formations, such as Amaranthaceae, Caryophyllaceae, Asteraceae, Centaurea and Calligonum. In parallel, in the Gulf of Oman, the presence of Impagidinium paradoxum indicates a lack of freshwater discharge into the ocean around this time. The desert taxa of the MCA were subsequently replaced by savannah formations at c. 1145 CE, comprised mainly of Poaceae and Cyperaceae, corresponding to the Little Ice Age (LIA), indicating generally wetter climatic conditions. A sudden increase in Spiniferites ramosus (1-63%), at c. 1440 CE suggests an increase in the strength of the SW summer monsoon, with increased freshwater discharge into the ocean at this time. Our data indicate that over the past two millennia the NW Arabian Sea region has alternated between contrasting climatic conditions, with firstly a humid phase equivalent to the cultural period of the Sassanid Empire, a significantly drier climate during the MCA and a relatively wetter climate during the LIA. The mechanisms resulting in dry conditions during the MCA in the Middle East associated with the northward shift of the ITCZ and the intensification of the Indian summer monsoon may be similar to those causing the dry conditions which dominated the Early Holocene in the Near East. Our palaeoenvironmental proxy data support current observations that a globally anthropogenically-induced warmer climate is likely to lead to increased drought severity in the Middle East, putting additional stress on governments already struggling with poverty and social tensions. © 2016 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59569
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Life Sciences, Brunel University London, Kingston Lane, Uxbridge, United Kingdom; College of Engineering, Design and Physical Sciences, Brunel University London, Kingston Lane, Uxbridge, United Kingdom; Iranian National Institute for Oceanography and Atmospheric Science, No. 3, Etemadzadeh St., Fatemi Ave., 12, Tehran, Iran
Recommended Citation:
Miller C.S.,Leroy S.A.G.,Collins P.E.F.,et al. Late Holocene vegetation and ocean variability in the Gulf of Oman[J]. Quaternary Science Reviews,2016-01-01,143