DOI: 10.1016/j.atmosenv.2015.05.043
Scopus记录号: 2-s2.0-84929600919
论文题名: Long term characterization of aerosol optical properties: Implications for radiative forcing over the desert region of Jodhpur, India
作者: Bhaskar V ; V ; , Safai P ; D ; , Raju M ; P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 114 起始页码: 66
结束页码: 74
语种: 英语
英文关键词: Aerosol optical thickness
; Angström exponent
; Dust storm
; Heating rates
; Radiative forcing
; Temporal variation
Scopus关键词: Aerosols
; Atmospheric aerosols
; Atmospheric radiation
; Atmospheric thermodynamics
; Dust
; Global warming
; Heating rate
; Regression analysis
; Storms
; Aerosol optical thickness
; Aerosol radiative forcing
; Atmospheric heating rate
; Dust storm
; Physical characteristics
; Radiative forcing efficiency
; Radiative forcings
; Temporal variation
; Optical properties
; aerosol property
; desert
; dominance
; optical property
; radiative forcing
; seasonal variation
; aerosol
; aerosol optical thickness
; Article
; asymmetry parameter
; atmospheric radioactivity
; circadian rhythm
; controlled study
; cooling
; desert
; desert climate
; dust
; environmental parameters
; environmental temperature
; global climate
; heating
; India
; measurement accuracy
; optics
; photometer
; physical parameters
; prevalence
; priority journal
; radiation detector
; radiative forcing
; seasonal rain forest
; seasonal variation
; single scattering albedo
; solar radiation
; summer
; warming
; waveform
; wind
; winter
; India
; Jodhpur
; Rajasthan
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: AOT data for eight years period (2004-2012) using the MICROTOPS II Sun photometer has been used to study the wavelength dependent optical characteristics of aerosols over Jodhpur, situated in the desert region in NW India. The daily mean AOT at 500nm for the present study period was 0.66±0.14 with an average Angstrom exponent as 0.71±0.20. Linear regression analysis of monthly AOT and Angstrom Exponent indicated an increasing trend of both. Seasonal variations of daily AOT and α as well as spectral dependence of seasonal mean AOT are presented. Diurnal variation of AOT and α in different season is studied. Impact of dust storm events on the aerosol characteristics over Jodhpur during the study period is studied. AOT values derived from MICROTOPS II were cross checked with Sun Sky Radiometer (Model POM-01, Prede Inc.) data for the period from May 2011 to April 2012 and were found to be in good agreement. Short wave aerosol radiative forcing (ARF) was computed for one year period of May 2011 to April 2012. Spectral variation of AOT, SSA and ASP showed more AOT and ASP during pre monsoon period when SSA was comparatively low; indicating towards more prevalence of coarse size absorbing dust in this period. The ARF at SUF and TOA was negative during all the seasons indicating dominance of scattering type aerosols mainly dust particles whereas that at ATM was positive in all the seasons indicating heating of the atmosphere, especially more during pre monsoon (+40.5W/m2) than during rest of the year (+19.5W/m2). A high degree of correlation between ARF at the SUF with AOT (R2=0.94) indicated that ARF is a strong function of AOT. The radiative forcing efficiency inferred to scattering nature of aerosols at SUF (-4.2W/m2/AOD) and TOA (-63.2W/m2/AOD) indicating cooling at surface and top of the atmosphere whereas, there was warming of the atmosphere in between (+59W/m2/AOD). The atmospheric heating rates varied from 0.49K/day in post monsoon to 1.13K/day in pre monsoon. This study has enabled us to understand the long term nature and physical characteristics of atmospheric aerosols over Jodhpur. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81648
Appears in Collections: 气候变化事实与影响
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作者单位: India Meteorological Department, Pune, India; Indian Institute of Tropical Meteorology, Pune, India
Recommended Citation:
Bhaskar V,V,, Safai P,et al. Long term characterization of aerosol optical properties: Implications for radiative forcing over the desert region of Jodhpur, India[J]. Atmospheric Environment,2015-01-01,114