DOI: 10.1016/j.atmosres.2017.11.009
Scopus记录号: 2-s2.0-85034258938
论文题名: Electrical sensing of the dynamical structure of the planetary boundary layer
作者: Nicoll K.A. ; Harrison R.G. ; Silva H.G. ; Salgado R. ; Melgâo M. ; Bortoli D.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 202 起始页码: 81
结束页码: 95
语种: 英语
Scopus关键词: Aerosols
; Atmospheric movements
; Boundary layer flow
; Boundary layers
; Electric fields
; Meteorological instruments
; Aerosol vertical profiles
; Boundary layer transport
; Dynamical structure
; Electric field sensors
; Global electric circuit
; Planetary boundary layers
; Ultra-fine aerosols
; Vertical conduction current
; Atmospheric thermodynamics
; aerosol
; atmospheric structure
; boundary layer
; diurnal variation
; electrical method
; vertical profile
; Portugal
英文摘要: Turbulent and convective processes within the planetary boundary layer are responsible for the transport of moisture, momentum and particulate matter, but are also important in determining the electrical charge transport of the lower atmosphere. This paper presents the first high resolution vertical charge profiles during fair weather conditions, obtained with instrumented radiosonde balloons over Alqueva, Portugal during the summer of 2014. The short intervals (4 h) between balloon flights enabled the diurnal variation in the vertical profile of charge within the boundary layer to be examined in detail, with much smaller charges (up to 20 pC m− 3) observed during stable night time periods than during the day. Following sunrise, the evolution of the charge profile was complex, demonstrating charged ultrafine aerosol, lofted upwards by daytime convection. This produced charge up to 92 pC m− 3 up to 500 m above the surface. The diurnal variation in the integrated column of charge above the site tracked closely with the diurnal variation in near surface charge as derived from a nearby electric field sensor, confirming the importance of the link between surface charge generation processes and aloft. The local aerosol vertical profiles were estimated using backscatter measurements from a collocated ceilometer. These were utilised in a simple model to calculate the charge expected due to vertical conduction current flow in the global electric circuit through aerosol layers. The analysis presented here demonstrates that charge can provide detailed information about boundary layer transport, particularly in regard to the ultrafine aerosol structure, that conventional thermodynamic and ceilometer measurements do not. © 2017 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108981
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: Department of Meteorology, University of Reading, Earley Gate, Reading, Berkshire RG6 6BB, United Kingdom; Department of Electronic and Electrical Engineering, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom; Renewable Energies Chair, University of Évora, Palácio do Vimioso, Largo Marquês de Marialva, Évora, 7002-554, Portugal; Departamento de Física, ICT, Instituto de Ciências da Terra, Universidade de Évora, Rua Romão Ramalho 59, Évora, 7002-554, Portugal
Recommended Citation:
Nicoll K.A.,Harrison R.G.,Silva H.G.,et al. Electrical sensing of the dynamical structure of the planetary boundary layer[J]. Atmospheric Research,2018-01-01,202