Long term characterization of aerosol optical properties: Implications for radiative forcing over the desert region of Jodhpur, India

Bhaskar, V. Vizaya; Safai, P.D.; Raju, M.P.

doi:10.1016/j.atmosenv.2015.05.043

Cited by 27 publications

(11 citation statements)

References 35 publications

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“…With increasing wavelength, SSA increases due to the dominance of desert dust. The low values of AOD and ASY and high values of SSA on non-dusty days indicate the dominance of scattering type aerosols like sea salt and sulfate (Bhaskar et al, 2015). …”

Section: Asymmetry Parameter Single Scattering Albedomentioning

confidence: 99%

“…The mechanism causes to change the atmospheric radiative fluxes and is known as the aerosol direct radiative forcing. Depending on the aerosol types and physical and optical properties, the direct aerosol radiative forcing may show negative/positive values and have cooling/heating effects on climate (Feng and Christopher, 2013;Bhaskar et al, 2015). The average direct aerosol radiative forcing for all types aerosols is found to be -0.5 ± 0.4 W m -2 at the Top Of Atmosphere (TOA) with a mediumlow level of scientific understanding (IPCC, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…The aerosols are the main sources of uncertainties in climate assessments due to various distributions and insufficient understanding of their properties (Hansen et al, 1997;Choobari et al, 2014;Bhaskar et al, 2015). Aerosols have an influence on radiative processes and climate: Directly by backscattering and absorbing shortwave solar radiation (McCormick and Ludwig, 1967), Semi-directly by changing the structure of atmospheric temperature and altering the rate of cloud droplet evaporation (Koren et al, 2004) and indirectly, by affecting the cloud microphysics (Liou and Ou, 1989;Kumar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Radiative Effects and Optical Properties of Aerosol during Two Dust Events in 2013 over Zanjan, Iran

Gharibzadeh

Alam

Bidokhti

et al. 2017

Aerosol Air Qual. Res.

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Aerosol optical properties like Aerosol Optical Depth (AOD), Angstrom Exponent (AE), ASYmmetry parameter (ASY), Single Scattering Albedo (SSA), and Aerosol Volume Size Distribution (AVSD) have been analyzed for the atmosphere of Zanjan, a city in Northwest Iran. These properties have been studied using the ground-based AErosol RObotic NETwork (AERONET) during the periods from 8 to18 May and 8 to 14 June, 2013. During the study period, 14th May and 10th June are identified as dusty days, and AOD at 500 nm reached a peak value of 0.64 and 0.80, on these days. The high values of AOD and low values of AE during dusty days illustrate that coarse mode particles like dust are dominant. In the visible spectrum ASY usually decreases and then somewhat increases in the near infrared region. Both SSA and AVSD suggest predominance of coarse particles on the dusty days. The Santa Barbara DISORT Atmospheric Radiative Transfer (SBDART) model is utilized to simulate the solar irradiance values for the above-mentioned periods at the earth's surface, within the atmosphere, and at the Top of the Atmosphere (TOA). The results show that dominant aerosol types are dust particles which have a cooling effect on the earth's surface during the study periods, especially on two dusty days, 14 May, and 10 June. The correlation coefficient shows a very good agreement between the ARF values retrieved from AERONET and SBDART simulation results.

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Section: Asymmetry Parameter Single Scattering Albedomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radiative Effects and Optical Properties of Aerosol during Two Dust Events in 2013 over Zanjan, Iran

Gharibzadeh

Alam

Bidokhti

et al. 2017

Aerosol Air Qual. Res.

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“…Aerosol radiative forcing (ARF) can be used to investigate the radiative effect of aerosol particles in atmospheric column [35][36][37]; however, in order to directly compare ARF data obtained under different aerosol loading conditions, the ARF efficiency is a more appropriate measurement [1]. Aerosol radiative forcing efficiency was calculated as the radiative forcing per unit of AOD.…”

Section: Aerosol Radiative Forcing Measurements By Sun-photometersmentioning

confidence: 99%

Analysis of Aerosol Radiative Forcing over Beijing under Different Air Quality Conditions Using Ground-Based Sun-Photometers between 2013 and 2015

et al. 2016

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Aerosol particles can strongly affect both air quality and the radiation budget of the atmosphere. Above Beijing, the capital city of China, large amounts of aerosols within the atmospheric column have caused the deterioration of local air quality and have influenced radiative forcings at both the top and the bottom of the atmosphere (BOA and TOA). Observations of aerosol radiative forcing and its efficiency have been made using two sun-photometers in urban Beijing between 2013 and 2015, and have been analyzed alongside two air quality monitoring stations' data by dividing air quality conditions into unpolluted, moderately polluted, and heavily polluted days. Daily average PM 2.5 concentrations varied greatly in urban Beijing (5.5-485.0 µg/m 3 ) and more than one-third of the analyzed period is classified as being polluted according to the national ambient air quality standards of China. The heavily polluted days had the largest bottom of atmosphere (BOA) and top of atmosphere (TOA) radiative forcings, but the smallest radiative forcing efficiencies, while the unpolluted days showed the opposite characteristics. On heavily polluted days, the averaged BOA aerosol radiative forcing occasionally exceeded´150 W/m 2 , which represents a value about three-times greater than that for unpolluted days. BOA aerosol radiative forcing was around two-to-three times as large as TOA aerosol radiative forcing under various air quality conditions, although both were mostly negative, suggesting that aerosols had different magnitudes of cooling effects at both the surface and the top of the atmosphere. Unpolluted days had the largest average values of aerosol radiative forcing efficiencies at BOA (and TOA) levels, which exceeded 190 W/m 2 (´70 W/m 2 ), compared with the lowest average values in heavily polluted days of around´120 W/m 2 (´55 W/m 2 ). These results suggest that the high concentrations of particulate matter pollution in the urban Beijing area had a strong cooling effect at both BOA and TOA levels.

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“…The aerosols studies over India show spatial and temporal variability of aerosols over the Indian subcontinents (Pandithurai et al, 2008;Srivastava et al, 2015, Bhaskar et al, 2015. Previous studies of aerosol radiative forcing show strong variation over Delhi (Dey et al, 2004;Singh et al, 2005;Pandithurai et al, 2008;Srivastava et al, 2014Srivastava et al, , 2015, Lahore and Karachi (Alam et al, 2012;Srivastava et al, 2014), Kanpur , however mostly these studies focused on Indo-Gangetic Plains (IGP) region over India.…”

Section: Introductionmentioning

confidence: 96%

Radiative Forcing Estimation of Aerosols at an Urban Site near the Thar Desert Using Ground-Based Remote Sensing Measurements

Verma

Prakash

Srivastava

et al. 2017

Aerosol Air Qual. Res.

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The focus of present study is to quantify the radiation budget of aerosols over Jaipur (Northwestern, India) from 2011 to 2015. The Aerosol radiative forcing (ARF) has been determined for shortwave spectrum (0.3-3.0 µm) individually for the top of the atmosphere (TOA), bottom of the atmosphere (BOA) and within the atmosphere (ATM) over study region. Santa Barbara DISORT Atmospheric Radiative Transfer model (SBDART) is used to simulate the aerosols radiative effect.The inter-annual monthly average of ARF at TOA during 2011-2015 is found between -11.40 to -5.60 W m . The net ATM forcing during NDP is between 12.2 to 17.05 W m -2 . The value of BOA increases more than ~67% during DSP than NDP. The more increase (-ve) in surface forcing represents the cooling of the surface during DSP. The results depict that dust over Jaipur in the vicinity of the Thar Desert is scattering in nature with high value (> 0.95) of SSA. The scattering is mostly high during summer and low in winter.

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Long term characterization of aerosol optical properties: Implications for radiative forcing over the desert region of Jodhpur, India

Cited by 27 publications

References 35 publications

Radiative Effects and Optical Properties of Aerosol during Two Dust Events in 2013 over Zanjan, Iran

Radiative Effects and Optical Properties of Aerosol during Two Dust Events in 2013 over Zanjan, Iran

Analysis of Aerosol Radiative Forcing over Beijing under Different Air Quality Conditions Using Ground-Based Sun-Photometers between 2013 and 2015

Radiative Forcing Estimation of Aerosols at an Urban Site near the Thar Desert Using Ground-Based Remote Sensing Measurements

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