Theory of series of exponents and their application for analysis of radiation processes

Tvorogov, S. D.; Zhuravleva, T. B.; Rodimova, O. B.; Firsov, K. M.

doi:10.1007/978-3-540-78209-4_9

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…However, because the broadband radiation fluxes are the main interest in this work and because the contribution of the aforementioned spectral regions to the total flux (0.2-5 µm) is less than 0.2 %, we do not apply this more accurate but laborious procedure. The comparisons showed the numerical simulation results to be in satisfactory agreement with the results of line-by-line calculations and field measurements (Tvorogov et al, 2008;Chesnokova et al, 2009).…”

Section: Radiative Calculationssupporting

confidence: 73%

An empirical model of optical and radiative characteristics of the tropospheric aerosol over West Siberia in summer

et al. 2012

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Abstract. An empirical model of the vertical profiles of aerosol optical characteristics is described. This model was developed based on data acquired from multi-year airborne sensing of optical and microphysical characteristics of the tropospheric aerosol over West Siberia. The main initial characteristics for the creation of the model were measurement data of the vertical profiles of the aerosol angular scattering coefficients in the visible wavelength range, particle size distribution functions and mass concentrations of black carbon (BC). The proposed model allows us to retrieve the aerosol optical and radiative characteristics in the visible and near-IR wavelength range, using the season, air mass type and time of day as input parameters. The columnar single scattering albedo and asymmetry factor of the aerosol scattering phase function, calculated using the average vertical profiles, are in good agreement with data from the AERONET station located in Tomsk.For solar radiative flux calculations, this empirical model has been tested for typical summer conditions. The available experimental database obtained for the regional features of West Siberia and the model developed on this basis are shown to be sufficient for performing these calculations.

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Section: Radiative Calculationssupporting

confidence: 73%

An empirical model of optical and radiative characteristics of the tropospheric aerosol over West Siberia in summer

et al. 2012

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“…The radiative fluxes simulated with our radiative transfer code were previously found to be in satisfactory agreement with the results of line-by-line calculations [60,67] and data from field measurements [68,69]. In this study, the broadband radiative fluxes were calculated in the background and smoke-polluted atmosphere to estimate the ARF and ARFE of BB aerosol.…”

Section: Radiative Transfer Codesupporting

confidence: 71%

Impact of the Atmospheric Photochemical Evolution of the Organic Component of Biomass Burning Aerosol on Its Radiative Forcing Efficiency: A Box Model Analysis

et al. 2021

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We present the first box model simulation results aimed at identification of possible effects of the atmospheric photochemical evolution of the organic component of biomass burning (BB) aerosol on the aerosol radiative forcing (ARF) and its efficiency (ARFE). The simulations of the dynamics of the optical characteristics of the organic aerosol (OA) were performed using a simple parameterization developed within the volatility basis set framework and adapted to simulate the multiday BB aerosol evolution in idealized isolated smoke plumes from Siberian fires (without dilution). Our results indicate that the aerosol optical depth can be used as a good proxy for studying the effect of the OA evolution on the ARF, but variations in the scattering and absorbing properties of BB aerosol can also affect its radiative effects, as evidenced by variations in the ARFE. Changes in the single scattering albedo (SSA) and asymmetry factor, which occur as a result of the BB OA photochemical evolution, may either reduce or enhance the ARFE as a result of their competing effects, depending on the initial concentration OA, the ratio of black carbon to OA mass concentrations and the aerosol photochemical age in a complex way. Our simulation results also reveal that (1) the ARFE at the top of the atmosphere is not significantly affected by the OA oxidation processes compared to the ARFE at the bottom of the atmosphere, and (2) the dependence of ARFE in the atmospheric column and on the BB aerosol photochemical ages almost mirrors the corresponding dependence of SSA.

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“…The algorithm intrinsically takes into account the multiple scattering, absorption by aerosol and molecular particles, as well as the reflection of incident radiation from the underlying surface according to Lambert's law. The comparisons showed that the numerical simulation results are in a satisfactory agreement with results of line-byline calculations and data from field measurements (Tvorogov et al, 2008;Zhuravleva et al, , 2014. The spectral AOD (340-1020 nm), the water vapour content, the column-integrated single scattering albedo, and the asymmetry parameter taken from AERONET were used as the main input parameters of the algorithm under the smoke conditions.…”

Section: Model and Input Datasupporting

confidence: 54%

Radiative characteristics of aerosol during extreme fire event over Siberia in summer 2012

et al. 2017

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Abstract. Microphysical and optical properties of aerosol were studied during a mega-fire event in summer 2012 over Siberia using ground-based measurements of spectral solar radiation at the AERONET site in Tomsk and satellite observations. The data were analysed using multi-year (2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013) measurements of aerosol characteristics under background conditions and for less intense fires, differing in burning biomass type, stage of fire, remoteness from observation site, etc. ("ordinary" smoke). In June-August 2012, the average aerosol optical depth (AOD, 500 nm) had been 0.95 ± 0.86, about a factor of 6 larger than background values (0.16 ± 0.08), and a factor of 2.5 larger than in ordinary smoke. The AOD values were extremely high on 24-28 July and reached 3-5. A comparison with satellite observations showed that ground-based measurements in the region of Tomsk not only reflect the local AOD features, but are also characteristic for the territory of Western Siberia as a whole. Single scattering albedo (SSA, 440 nm) in this period ranged from 0.91 to 0.99 with an average of ∼ 0.96 in the entire wavelength range of 440-1020 nm. The increase in absorptance of aerosol particles (SSA(440 nm) = 0.92) and decrease in SSA with wavelength observed in ordinary smoke agree with the data from multi-year observations in analogous situations in the boreal zone of USA and Canada. Volume aerosol size distribution in extreme and ordinary smoke had a bimodal character with significant prevalence of finemode particles, but in summer 2012 the mean median radius and the width of the fine-mode distribution somewhat increased. In contrast to data from multi-year observations, in summer 2012 an increase in the volume concentration and median radius of the coarse mode was observed with growing AOD.The calculations of the average radiative effects of smoke and background aerosol are presented. Compared to background conditions and ordinary smoke, under the extreme smoke conditions the cooling effect of aerosol considerably intensifies: direct radiative effects (DRE) at the bottom (BOA) and at the top of the atmosphere (TOA) are −13, −35, and −60 W m −2 and −5, −14, and −35 W m −2 respectively. The maximal values of DRE were observed on 27 July (AOD(500 nm) = 3.5), when DRE(BOA) reached −150 W m −2 , while DRE(TOA) and DRE of the atmosphere were −75 W m −2 . During the fire event in summer 2012 the direct radiative effect efficiency varied in range: at the BOA it was −80-−40 W m −2 , at the TOA it was −50-−20 W m −2 and in the atmosphere it was −35-−20 W m −2 .

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Theory of series of exponents and their application for analysis of radiation processes

Cited by 7 publications

References 13 publications

An empirical model of optical and radiative characteristics of the tropospheric aerosol over West Siberia in summer

An empirical model of optical and radiative characteristics of the tropospheric aerosol over West Siberia in summer

Impact of the Atmospheric Photochemical Evolution of the Organic Component of Biomass Burning Aerosol on Its Radiative Forcing Efficiency: A Box Model Analysis

Radiative characteristics of aerosol during extreme fire event over Siberia in summer 2012

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