DOI: 10.1002/2015GL063116
论文题名: Near-surface dust flux enrichment in small particles during erosion events
作者: Dupont S. ; Alfaro S.C. ; Bergametti G. ; Marticorena B.
刊名: Geophysical Research Letters
ISSN: 0094-8837
EISSN: 1944-8568
出版年: 2015
卷: 42, 期: 6 起始页码: 1992
结束页码: 2000
语种: 英语
英文关键词: deposition velocity
; dust
; saltation
; sandblasting
Scopus关键词: Air
; Biogeochemistry
; Budget control
; Deposition
; Earth atmosphere
; Erosion
; Screening
; Sorting
; Air flow modeling
; Biogeochemical cycle
; Deposition velocities
; Erosion modeling
; Saltation
; Sandblasting
; Small particles
; Stationary state
; Dust
; airflow
; biogeochemical cycle
; dust
; flow modeling
; particle size
; wind field
; wind velocity
英文摘要: Mineral dust in the atmosphere impacts Earth's radiative budget and biogeochemical cycles. Sorting of dust-sized particles within the first few meters above the soil during wind erosion is still unknown. In particular, the sensitivity of the size distribution of dust flux to wind intensity has been questioned for years. This sensitivity is reanalyzed here using a novel erosion model developed in a turbulent airflow model. Starting from air free of dust, the suspension of small dust (1.5μm) needs several hours to reach a stationary state against about 20 min for coarser dust (> 5μm). During this nonstationary phase, a continuous enrichment of the near-surface dust flux in small particles is simulated, enrichment enhanced with wind intensity. This is explained by the lower deposition velocity of small dust particles, a process usually ignored in interpretation of field data but that plays a crucial role in sorting dust particles. Key Points The air gets saturated slower in small dust than in coarse dust Enrichment of dust flux in small dust with wind speed is possible Particle deposition velocity plays a crucial role in sorting dust particles ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927794832&doi=10.1002%2f2015GL063116&partnerID=40&md5=1ed9f908797816f5a26311a6929b4a40
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8453
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: INRA, UMR 1391 ISPA, Villenave d'Ornon, France
Recommended Citation:
Dupont S.,Alfaro S.C.,Bergametti G.,et al. Near-surface dust flux enrichment in small particles during erosion events[J]. Geophysical Research Letters,2015-01-01,42(6).