DOI: 10.1016/j.atmosenv.2020.117261
论文题名: The present-day atmospheric dust deposition process in the South China Sea
作者: Du S. ; Xiang R. ; Liu J. ; Liu J.P. ; Islam G.M.A. ; Chen M.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 223 语种: 英语
英文关键词: Atmospheric movements
; Atmospheric structure
; Atmospheric thermodynamics
; Deposition
; Ecosystems
; Grain size and shape
; Scanning electron microscopy
; Size distribution
; Aeolian environment
; Atmospheric dust
; Continental materials
; Depositional fluxes
; Grain size
; Grain size distribution
; South China sea
; Transport process
; Dust
; aerosol
; atmospheric deposition
; atmospheric transport
; dust
; eolian deposit
; grain size
; quartz
; size distribution
; westerly
; aerosol
; Article
; atmospheric deposition
; atmospheric transport
; dry deposition
; dust
; East Asian
; Indian Ocean
; monsoon climate
; Pacific Ocean
; particle size
; priority journal
; scanning electron microscopy
; seasonal variation
; South China Sea
; Southeast Asian
; summer
; surface property
; wet deposition
; wind
; winter
; Pacific Ocean
; South China Sea
学科: Atmospheric dust
; Grain size
; SEM
; South China sea
; Transport process
中文摘要: Modern dust plays essential roles in marine and climate processes, which bring continental material to the ocean and sensitivity in marine ecosystems. However, the atmospheric dust deposition process has rarely been studied in the South China Sea (SCS). Here, we present 51 atmospheric dust samples, collected along the SCS, to investigate the grain size distribution, depositional flux, and features revealed by scanning electron microscopy, combined with 5-day back trajectories to indicate the present-day dust deposition process for the first time. The grain size distribution and depositional flux of aerosol samples illustrate the seasonal trend: coarser particle and higher flux mass in winter than summer. The average grain size is 5.75 μm during winter and 3.62 μm from summer, and the depositional flux in the winter is 1.4 times than that in summer, both are related to the transport pathway and power of the East Asian monsoon. Modeled 5-day back trajectories of dust samples suggest a southwesterly transport pathway in summer and the Southeast Asian monsoon as a possible source of the dust loading, while the northeast winds drove the aeolian dust transport during the winter monsoon from the Asian continent. Meanwhile, westerly circulation conveys the fine particles (~0.63 μm) as the stable terrigenous component into the SCS, deposited through the entire dust deposition process from the atmosphere and water to the surface sediment. Furthermore, the surface of quartz particles from atmospheric dust shows the unique structure in the aeolian environment as a reference to distinguish the different continental components in the sediments. This study provides new insights into the present-day dust deposition process in the SCS, significantly extending the current understanding of the relationship between atmospheric dust and the marginal sea. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160972
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China; Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301, China; Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, United States; University of Chinese Academy of Sciences, Beijing, 100049, China
Recommended Citation:
Du S.,Xiang R.,Liu J.,et al. The present-day atmospheric dust deposition process in the South China Sea[J]. Atmospheric Environment,2020-01-01,223