Estimation of shortwave direct aerosol radiative forcing at four locations on the Indo-Gangetic plains: Model results and ground measurement

Bibi, Humera; Alam, Khan; Bibi, Samina

doi:10.1016/j.atmosenv.2017.05.043

Cited by 35 publications

(21 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Values at the SURF show a good general agreement, with a high correlation coefficient of 0.97. This value is similar to those obtained by Alam et al (2012) for Lahore and Karachi using SBDART model (0.99 and 0.98, respectively), and notably higher than those obtained by Bibi et al (2017) over Karachi (0.51), Lahore (0.81), Jaipur (0.66) and Kanpur (0.69). This good correlation between AERONET and libRadtran surface forcing demonstrates that the input parameters, particularly the atmospheric profiles, constitute an appropriate representation of the prevailing atmospheric conditions in our location of study.…”

Section: Aerosol Radiative Forcingsupporting

confidence: 71%

See 1 more Smart Citation

Thirteen Years of Aerosol Radiative Forcing in Southwestern Iberian Peninsula

Muñoz

Costa

Silva

et al. 2017

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Notable uncertainties in the aerosol impact on the Earth's radiative budget still remain, mainly at local scales. This study aims to accurately quantify the shortwave aerosol radiative forcing (ARF) and its efficiency (ARFE) at Évora (Portugal, Southwestern Europe). This is an interesting region affected by different aerosol types and sources. Towards this goal, ARF and ARFE are calculated for Évora during thirteen years (2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015), which is the longest period ever analyzed for this region. For this calculation, the most updated AERONET data have been used to simulate irradiance with the libRadtran code. Thus, 1676 daily values were analyzed, obtaining a mean ARF of -7.4 W m -2 at the Earth's surface (SURF) and -1.1 W m -2 at the top of the atmosphere (TOA), indicating a cooling of the Earth-atmosphere system. The difference in ARF between TOA and SURF indicates a mean net gain of 6.3 W m -2 for the atmosphere. While no ARF seasonal pattern is observed at the TOA, a clear seasonal cycle is detected at the SURF with the most negative values occurring in summer. On the other hand, ARFE shows mean values of -62.7 W m -2 τ -1 at the SURF and -14.3 W m -2 τ -1 at the TOA. Results show that ARFE highly depends on the aerosol single scattering albedo, showing opposite behavior at the SURF and at the TOA. The large temporal variability detected in the aerosol properties in the region of study confirms the general need for long time series of measurements to achieve an accurate estimation of the ARF and ARFE.

show abstract

Section: Aerosol Radiative Forcingsupporting

confidence: 71%

“…6(b)). This value is notably higher than the values obtained by Bibi et al (2017) over Karachi (0.46), Lahore (0.73), Jaipur (0.57) and Kanpur (0.55). The libRadtran code allows to select two standard aerosol profiles, one typical of spring-summer and another of autumn-winter conditions.…”

Section: Aerosol Radiative Forcingcontrasting

confidence: 49%

Thirteen Years of Aerosol Radiative Forcing in Southwestern Iberian Peninsula

Muñoz

Costa

Silva

et al. 2017

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

show abstract

“…The instrument takes measurements of direct sun and diffuse sky radiances every 15 and 30 min interval at 340-1,640 and 440-1,020, respectively, with a field of view of 1.2° (Holben et al, 1998). More details concerning instrumentation, data acquisition, processing, retrieval algorithms, calibration, and precision have been discussed by number of authors (Adesina et al, 2017;Alam et al, 2012;Bibi et al, 2017;Boiyo et al, 2018a;Holben et al, 1998;Kang et al, 2016;Kumar et al, 2013;Smirnov et al, 2000). In the present work, Level 2.0 (cloud screened and quality assured) spectral AOD in the range 340-1,020 nm, AE (440-870 nm) and CWV (940 nm) constituted the direct sun measurements.…”

Section: Instrumentationmentioning

confidence: 99%

“…Though these networks are spatially limited, they are not constrained by surface reflectance, and hence more accurate than satellite observations. The aerosol properties derived from these networks have extensively been investigated by a number of authors (e.g., Alam et al, 2012;Bibi et al, 2017;El-Metwally et al, 2011;Kang et al, 2016;Patel et al, 2017;Yu et al, 2016) over different environments. Different regions in Africa (Adesina et al, 2015(Adesina et al, , 2017Kumar et al, 2017;Queface et al, 2011;Sivakumar et al, 2010) have also documented related findings and showed agreement.…”

Section: Introductionmentioning

confidence: 99%

A 10‐Year Record of Aerosol Optical Properties and Radiative Forcing Over Three Environmentally Distinct AERONET Sites in Kenya, East Africa

et al. 2019

View full text Add to dashboard Cite

In the framework of Aerosol Robotic Network (AERONET), the aerosol optical, microphysical, and radiative properties were investigated over three sites (CRPSM_Malindi, Nairobi, and ICIPE_Mbita) in Kenya, East Africa, during 2006–2015. The annual mean (±σ) aerosol optical depth at 440 nm (AOD440) was found high at Mbita (0.27 ± 0.09) followed by Malindi (0.26 ± 0.07), and low at Nairobi (0.19 ± 0.04). Whereas the seasonal mean AOD440 noticed high (low) values during the local dry (wet) seasons. The aerosol optical properties: AOD, single scattering albedo, asymmetry parameter, and complex aerosol refractive index exhibited significant temporal and spectral heterogeneities illustrating the complexity of aerosol types with an abundance of fine‐mode aerosols during the local dry (June–July–August) season. Characterization of major aerosol types revealed the dominance of mixed‐type followed by biomass burning aerosols. The aerosol volume size distribution revealed that the coarse‐ over fine‐mode aerosols showed a significant contribution to the total volume particle concentration, especially at high (>0.3) AOD440. Further, the aerosol columnar number size distribution retrieved from the King's inversion of spectral AOD exhibited a power law distribution affirming multiplicity of aerosol sources. The direct aerosol radiative forcing values simulated in the shortwave region using the Santa Barbara DISORT Atmospheric Radiative Transfer model showed good correlation (r = >0.85) with the AERONET‐derived ones at the top‐of‐atmosphere, bottom‐of‐atmosphere, and within the atmosphere. The annual mean (±σ) top‐of‐atmosphere, bottom‐of‐atmosphere, and within the atmosphere forcing values were found in the range from −8.10 ± 3.75 to −13.23 ± 4.87, −34.54 ± 4.86 to −46.11 ± 10.27, and 26.63 ± 6.43 to 36.24 ± 7.26 W/m2, respectively, with an atmospheric heating rate of 0.74 ± 0.12–1.02 ± 0.20 K/day. The Santa Barbara DISORT Atmospheric Radiative Transfer‐derived direct aerosol radiative forcing exhibited significant temporal heterogeneity with high (low) during the local dry (wet) seasons. Results derived from the present study forms a basis for regional climate change studies and could increase the accuracy of climate models over this unexplored region of Africa.

show abstract

“…A Figura 5 apresenta um indicativo de que a carga de material particulado, presente na atmosfera das duas cidades é elevada devido aos valores altos de AAOD. Em seus artigos, Bibi et al (2017) e Kaskaoutis et al (2012b) relataram um aumento de SSA para comprimentos de onda mais longos durante o verão e pré-monção. Bibi et al (2017) relata que isto é devido a influência de partícula grossa.…”

Section: Variação Espectral De Aaod E Ssaunclassified

Variabilidade Interanual Das Propriedades Óticas De Aerossóis Em Biomas Distintos Na Amazônia Legal

Romera

Musis

Palácios

et al. 2019

ABClima

View full text Add to dashboard Cite

A análise das propriedades óticas dos aerossóis é extremamente importante para o entendimento dos impactos que o material particulado pode provocar nos fluxos radiativos. Nesse sentido, este estudo teve como principal objetivo utilizar as medidas da AERONET (do inglês, AErosol RObotic NETwork) para avaliar as propriedades absortivas e espalhadoras dos aerossóis atmosféricos nos biomas cerrado e floresta amazônica (ambos na Amazônia Legal), além de avaliar a aplicabilidade do novo algoritmo (V3) da AERONET. Neste trabalho foram recuperados os dados dos radiômetros CIMEL sun-sky para os sites de Alta Floresta e Cuiabá MIRANDA, com nível 2.0 de processamento (V3), para o período de 17 anos (2000-2016). As variáveis analisadas foram a AAOD (do inglês, Absorption Aerosol Optical Deph), profundidade ótica de absorção do aerossol o SSA (do inglês, Single Scattering Albedo), albedo de espalhamento simples e o EAA (do inglês, Expoent Angstrom Absorption) expoente Angstrom de Absorção (440 a 870 nm). Os resultados evidenciaram que ambos biomas são fortemente impactados pela queima de biomassa. Os maiores valores encontrados para SSA e AAOD ocorreram para os menores comprimentos de onda, indicando a predominância de carbono orgânico. Este resultado indica que estas partículas são compostas por elementos que apresentam forte dependência espectral. Apesar da queda anual no desmatamento na região amazônica após 2004, observa-se que AAOD não seguiu o mesmo padrão. Também foi verificado que o produto de inversão V3 se mostrou eficiente para avaliação das propriedades óticas dos aerossóis no período seco da série estudada.

show abstract

Estimation of shortwave direct aerosol radiative forcing at four locations on the Indo-Gangetic plains: Model results and ground measurement

Cited by 35 publications

References 75 publications

Thirteen Years of Aerosol Radiative Forcing in Southwestern Iberian Peninsula

Thirteen Years of Aerosol Radiative Forcing in Southwestern Iberian Peninsula

A 10‐Year Record of Aerosol Optical Properties and Radiative Forcing Over Three Environmentally Distinct AERONET Sites in Kenya, East Africa

Variabilidade Interanual Das Propriedades Óticas De Aerossóis Em Biomas Distintos Na Amazônia Legal

Contact Info

Product

Resources

About