DOI: 10.1016/j.atmosenv.2014.09.008
Scopus记录号: 2-s2.0-84907068127
论文题名: Sensitivity of the atmospheric temperature profile to the aerosol absorption in the presence of dust
作者: Go´mez-Amo J ; L ; , di Sarra A ; , Meloni D
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 98 起始页码: 331
结束页码: 336
语种: 英语
英文关键词: Aerosol absorption/scattering
; Aerosol radiative forcing
; Atmospheric heating rate
; Temperature profile
Scopus关键词: Aerosol absorption
; Aerosol radiative forcing
; Atmospheric heating rate
; Atmospheric temperature profiles
; Temperature profiles
; absorption
; aerosol
; air temperature
; albedo
; cooling
; dust
; heating
; optical depth
; radiative transfer
; sensible heat flux
; temperature profile
; absorption
; aerosol
; air temperature
; Article
; boundary layer
; cooling
; dust
; heating
; Italy
; optical depth
; radiative forcing
; Italy
; Lazio
; Roma [Lazio]
; Rome
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Radiative transfer simulations in the shortwave (SW) and longwave (LW) spectral regions have been carried out to investigate the time evolution of the atmospheric heating/cooling rates and their influence on the temperature profiles under different vertical distributions of the aerosol absorption. The case study is based on measurements made at Rome, Italy, on 20 June 2007, when a dust layer was present above the urban boundary layer (BL) and the column aerosol optical depth at 550 nm was about 0.37. Column-integrated aerosol optical depth and single scattering albedo, as well as vertical profiles of aerosol extinction and meteorological variables have been derived from observations and used in the simulations. Different profiles of the aerosol absorption are considered by varying the absorption of the BL aerosols and of the desert dust, without changing the overall columnar properties. Three scenarios have been considered, with absorbing (ABL) or scattering (SBL) particles in the BL, and with a vertically homogeneous case (HL), which is taken as the reference. Calculations show that, for the selected case, about 25% of the SW heating is offset by the LW cooling within the dust layer. Different longwave/all-wave contributions are observed in the BL, depending on the BL aerosol absorption. Changes of atmospheric temperature induced by aerosol-radiation interactions only, have been investigated, while interactions with the surface through changes of the latent and sensible heat flux have been neglected. The evolution of temperature is similar for the three scenarios within the dust layer, with a daytime increase and a smaller nighttime decrease. After 24 h, the increase of the atmospheric temperature due to the aerosol radiative processes is about 1 K. In the BL, the increase of temperature is strongly dependent on the aerosol absorption capability. The oscillatory behaviour of the temperature with time in the dust layer, and the different evolution in the BL are expected to affect the temperature vertical gradient and may influence related processes. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80562
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratory for Earth Observations and Analyses, ENEA, S. Maria di Galeria, Rome, Italy; Departament de Fi´sica de la Terra y Termodina`mica, Universitat de Vale`ncia, Spain
Recommended Citation:
Go´mez-Amo J,L,, di Sarra A,et al. Sensitivity of the atmospheric temperature profile to the aerosol absorption in the presence of dust[J]. Atmospheric Environment,2014-01-01,98