DOI: 10.1016/j.quascirev.2016.12.012
Scopus记录号: 2-s2.0-85007374026
论文题名: A last glacial and deglacial pollen record from the northern South China Sea: New insight into coastal-shelf paleoenvironment
作者: Yu S. ; Zheng Z. ; Chen F. ; Jing X. ; Kershaw P. ; Moss P. ; Peng X. ; Zhang X. ; Chen C. ; Zhou Y. ; Huang K. ; Gan H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 157 起始页码: 114
结束页码: 128
语种: 英语
英文关键词: Asian summer monsoon
; Coastal-shelf
; Sea-level change
; South China Sea
; Vegetation
Scopus关键词: Atmospheric thermodynamics
; Core samples
; Glacial geology
; Salinity measurement
; Vegetation
; Asian summer monsoons
; Coastal-shelf
; Glacial-interglacial cycles
; Key characteristics
; Last Glacial Maximum
; Northern South China Sea
; Sealevel change
; South China sea
; Sea level
英文摘要: This study presents a marine palynological record of the Asian summer monsoon and sea level change in the Last Glacial Maximum (LGM) and the deglacial period in the northern South China Sea (SCS). A fossil core STD 235 (855 cm in length) and 273 surface sediment samples from the northern SCS were pollen analysed to reconstruct the paleoenvironment of the continental shelf during the last glacial period. Results from fossil pollen show that the main pollen source region fundamentally changed from the LGM to the deglacial period as sea level rapidly rose. The modern marine surface samples show that pollen concentrations in the estuary of the Pearl River are extremely high, and modern pollen assemblages are in good agreement with the regional vegetation. However, wind transport becomes more important in the deeper ocean as the percentages of Pinus, a taxon with very high pollen production and dispersal capacity, is highest in these sediments, which otherwise have very low pollen concentrations. The concentration of total pollen between surface and fossil pollen samples is compared in order to determine the possible vegetation sources areas for the marine core. Pollen concentration as high as >100 grains/g at the LGM suggested that the paleo-shoreline was located within 80 km of the core. Consequently, pollen would mostly have derived from the exposed continental shelf in the northern SCS. By contrast, pollen concentrations were very low due to a much greater transport distance (318 km at present, core STD 235) under higher sea levels, and windblown pollen played a more important role because of the limitation of riverine input into the deep ocean during this highstand period. Such alternation of pollen flux and source distance should be repeated during all glacial-interglacial cycles, reflecting closely sea level and climate dynamics. According to fossil pollen assemblages from Core STD 235, we conclude that wetland and/or grassland communities with sparse subtropical trees dominated most of the exposed shelf during the LGM rather than forest that characterizes the region today. The existence of a predominantly open landscape on the exposed continental shelf suggests lower precipitation during the LGM, which in turn indicates a weaker Asian summer monsoon. This finding is supported by other records from the Okinawa Trough and the East China Sea, suggesting that a weaker summer monsoon was a key characteristic of the LGM in East Asia. © 2016 Elsevier Ltd 资助项目: This study was supported by the National Natural Science Foundation of China (Grant No.41506049, 41472143, 41230101) and the project of China Geological Survey (SN: 1212011220115) as well as the Key Laboratory of Marine Mineral Resources of Ministry of Land and Resources in Guangzhou Marine Geological Survey (No. KLMMR-2014-A-02).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59332
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Marine Mineral Resource, Ministry of Land and Resources, Guangzhou Marine Geological Survey, Guangzhou, China; School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou, China; School of Geography and Environmental Science, Monash University, Melbourne, VIC, Australia; School of Geography, Planning and Architecture, The University of Queensland, Brisbane, Queensland, Australia
Recommended Citation:
Yu S.,Zheng Z.,Chen F.,et al. A last glacial and deglacial pollen record from the northern South China Sea: New insight into coastal-shelf paleoenvironment[J]. Quaternary Science Reviews,2017-01-01,157