DOI: 10.1016/j.atmosenv.2014.02.029
Scopus记录号: 2-s2.0-84896865457
论文题名: Effect of aerosols on evapo-transpiration
作者: Murthy B ; S ; , Latha R ; , Manoj Kumar, Mahanti N ; C
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 89 起始页码: 109
结束页码: 118
语种: 英语
英文关键词: Aerosol radiative forcing
; Evapo-transpiration
; Radiation budget
; Shortwave radiation
Scopus关键词: Aerosol direct radiative forcing
; Aerosol optical depths
; Aerosol radiative forcing
; Atmospheric conditions
; Radiation budget
; Short-wave radiation
; Simultaneous observation
; Single scattering albedo
; Atmospheric aerosols
; Atmospheric radiation
; Atmospheric thermodynamics
; Heat flux
; Solar radiation
; Transpiration
; aerosol
; energy balance
; energy flux
; evapotranspiration
; numerical model
; radiative forcing
; sensible heat flux
; shortwave radiation
; aerosol
; aerosol optical depth
; albedo
; article
; chemical parameters
; energy balance
; environmental impact
; evapotranspiration
; greenhouse gas
; optical depth
; photosynthesis
; priority journal
; radiation
; radiative forcing
; seasonal variation
; single scattering albedo
; spectrum
; Gangetic Plain
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: Aerosol direct radiative forcing (ARF) at surface is estimated from instantaneous, simultaneous observations of global radiation and aerosol optical depth (AOD) during winter, pre-monsoon and monsoon seasons over a tropical Indian station at the south-eastern end of Indo Gangetic basin. A comparison of observed and model derived ARFs is made and possible reasons for mismatch are discussed. Aerosol-induced reduction in solar visible (0.4-0.7μm) spectrum energy (SWvis), contributing 44% to total broad band (0.3-3.0μm) energy (SW), and its effect on surface energy fluxes are discussed in this study. Aerosols on an average reduce SWvis at surface by ~27%. SWvis reduces by 14.5Wm-2 for a 0.1 increase in AOD when single scattering albedo (SSA) is 0.979 where as it reduces by 67.5Wm-2 when SSA is 0.867 indicating the significant effect of absorbing aerosols. Effect of ARF on net radiation, Rn, sensible heat flux, H and latent heat flux/evapo-transpiration, LE are estimated using the observed ratios of Rn/SW, H/Rn and LE/Rn, having reasonably good correlation. Observed Rn/SW varies between 0.59 and 0.75 with a correlation of 0.99 between them. LE, calculated by energy balance method, varies from 56% to 74% of Rn but with a lesser correlation, the possible reasons are discussed. For a given ARF, LE decreases by ~14% and Rn by ~15% with respect to observed LE and Rn respectively. The reduction in LE increases from 37% to 54% of ARF when LE increases from 220Wm-2 to 440Wm-2, suggesting that wet soil induces relatively larger reduction in evaporation. The results agree with earlier model sensitivity studies that Rn reduces more with increase in aerosol absorption which is compensated by proportionate reductions in H and LE depending on soil and atmospheric conditions. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80651
Appears in Collections: 气候变化事实与影响
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作者单位: Indian Institute of Tropical Meteorology, Dr Homi Bhabha Road, Pune 411008, India; Central University of Jharkhand, Ranchi 834008, India; Center of Excellence in Climatology, Birla Institute of Technology, Ranchi 835215, India
Recommended Citation:
Murthy B,S,, Latha R,et al. Effect of aerosols on evapo-transpiration[J]. Atmospheric Environment,2014-01-01,89