Characteristics of the annual behavior of the spectral aerosol optical depth of the atmosphere under conditions of Siberia

Сакерин, С. М.; Beresnev, S. A.; Gorda, S. Yu.; Kabanov, Dmitry M.; Kornienko, G. I.; Markelov, Yu. I.; Mikhalëv, A. V.; Nikolashkin, S. V.; Panchenko, M. V.; Poddubny, V. A.; Полькин, В. В.; Смирнов, А. И.; Tashchilin, Mikhail; Turchinovich, S. A.; Turchinovich, Yu. S.; Holben, B. N.; Eremina, T. A.

doi:10.1134/s1024856009040101

Cited by 26 publications

(15 citation statements)

References 7 publications

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“…The asymmetry factor g 440 varied from 0.66 to 0.74, i.e. in the same range as multi-year average values in the territory of Siberia (Sakerin, 2012;Sakerin et al, 2009Sakerin et al, , 2014. From the results presented here it also follows that, on those days when SSA and AF were retrieved by two methods, the SSMART and AERONET codes gave consistent estimates of aerosol properties within their retrieval uncertainties.…”

Section: Weather-climate Featuressupporting

confidence: 53%

“…In the interval of 440-1020 nm, the spectral values ω λ and g λ have been linearly interpolated from the values of SSA and AF retrieved at the four AERONET inversion wavelengths, while for λ ≤ 440 nm and λ ≥ 1020 nm they have been considered constant, similar to García et al (2012) and Panchenko et al (2012). Under the background conditions, Level-2.0 retrieval products for the single scattering albedo and asymmetry factor, obtained on the basis of standard AERONET algorithm, are not available due to low AOD values (τ 550 = 0.13 according to data from multi-year ground-based measurements under summer conditions, Sakerin et al, 2009;Sakerin and Kabanov, 2015). Therefore, the OPAC model (averaged continental aerosol, relative air humidity is 70 %; Hess et al, 1998) was used to simulate the radiative characteristics under the conditions of the weakly turbid atmosphere.…”

Section: Model and Input Datamentioning

confidence: 99%

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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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Section: Weather-climate Featuressupporting

confidence: 53%

Section: Model and Input Datamentioning

confidence: 99%

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

et al. 2017

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“…Undoubtedly, the differences can be more dramatic with increasing AOD. However, according to long-term satellite measurements over West Siberia and near-ground measurements for the city of Tomsk, the respective average AOD values in summer are close to τ a (0.5 µm) ∼ 0.16 Sakerin et al, 2009;Zhuravleva et al, 2009). Thus, in this paper, we do not discuss the change in radiative flux differences caused by AOD variations.…”

Section: The Influence Of Spectral Variations In Aerosol Radiative Pamentioning

confidence: 81%

“…The total water vapour content was assumed to be W = 1.9 g cm −2 , the total ozone content was equal to 336 DU according to TOMS satellite data (ftp:// toms.gsfc.nasa.gov), and the total CO 2 content in the atmosphere was 380 ppm. (These values correspond to summer averages for the territory of West Siberia; Sakerin et al, 2009;Arshinov et al, 2009.) The data of Fontenla et al (1999) were used for the extraterrestrial spectral solar radiance.…”

Section: Radiative Calculationsmentioning

confidence: 99%

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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“…The regular spectrum measurements of optical aerosol characteristics were first started in June 2004 in the Middle Urals under the AERONET program of Global Atmo spheric Aerosol Monitoring (http://aeronet.gsfc.nasa.gov) with the assistance of the Goddard Space Flight Cen ter (GSFC/NASA, United States) and the Zuev Insti tute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences [1,2]. The optical characteris tics of the atmospheric aerosol are jointly studied by specialists from the Institute of Industrial Ecology, Ural Branch, Russian Academy of Sciences, and the Ural Federal University.…”

Section: Introductionmentioning

confidence: 99%

Features of optical characteristics of atmospheric aerosol in the Middle Urals

Poddubny

Luzhetskaya

Markelov

et al. 2013

Izv. Atmos. Ocean. Phys.

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Abstract-The results of studies into the aerosol optical depth (AOD) for the atmosphere in the Middle Urals in the spectrum range of 0.34-1.02 µm for 2004-2010 is presented. The interannual, annual, seasonal, and daily variations in the AOD are analyzed. The major statistical characteristics of the AOD, the parameters of the probability density function of distributions over different wave lengths, and the parameters of Angstrom's formula for the different seasons are calculated. The monitoring stations in the Russian segment of the AERONET network are ranked with respect to the AOD value. A shift from March to May in the spring max imum of the AOD is revealed in comparison with the results of the actinometric observations for the period of . A qualitative assessment is given to the influence of forest and peat fires in the region on the AOD. A classification of the states of aerosol haze in the atmosphere according to the AOD values is proposed.

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Characteristics of the annual behavior of the spectral aerosol optical depth of the atmosphere under conditions of Siberia

Cited by 26 publications

References 7 publications

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

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

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

Features of optical characteristics of atmospheric aerosol in the Middle Urals

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