On results of studies of atmospheric aerosol optical depth in arctic regions

Sakerin, S. M.; Andreev, S. Yu.; Kabanov, Dmitry M.; Nikolashkin, S. V.; Prakhov, A. N.; Радионов, В. Ф.; Turchinovich, Yu. S.; Chernov, D. G.; Holben, B. N.; Smirnov, A.; Sorokin, M. G.

doi:10.1134/s1024856014060165

Cited by 17 publications

(8 citation statements)

References 12 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: 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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Section: Weather-climate Featuressupporting

confidence: 54%

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

et al. 2017

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“…At the same time, it should be noted that regular AOD measurements at Arctic latitudes are difficult to perform because of low elevation (or absence) of Sun during appreciable part of the year, severe weather conditions, clouds, and fogs. Partly, this also explains the low confidence level of satellite observations, considered in work 6 . Therefore, acquisition of new (even small) data of ground-based observations is especially important.…”

Section: Introductionmentioning

confidence: 89%

Specific features of spatial distribution of atmospheric aerosol optical depth along northern sea route

et al. 2014

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We discuss the aerosol optical depth (AOD) measurements with the sun photometers onboard "Akademik Fedorov" and "Professor Khlyustin" research vessels in Arctic and Far East seas along the Northern Sea Route. Coastal observations in Barentsburg, Tiksi, and Vladivostok are employed to analyze the ship-based measurements. It is shown that AOD in Arctic differs little, with the average AOD values being much less than in the background midlatitude regions. In the spatial distributions of AOD and water vapor in Far East seas, we can clearly see the latitudinal dependence: all characteristics in the Bering Sea are close to data in the Arctic zone, these characteristics increase by a factor of 1.5-2 near south coasts of Kamchatka, and the difference reaches a factor of 4-6 in the region of Vladivostok.

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“…The small AOD values in the studied regions were because during summer 2013 in the boreal part of Eurasia there were no severe forest fires, which affect the Arctic atmosphere appreciably (Stohl et al, 2006;Eck et al, 2009). These events in the Eurasian part of Russia were last observed in 2010 and 2012 (Chubarova et al, 2012;Sakerin et al, 2014).…”

Section: Characterization Of Expedition Measurementsmentioning

confidence: 98%

On measurements of aerosol-gas composition of the atmosphere during two expeditions in 2013 along the Northern Sea Route

et al. 2015

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Abstract. We presented the results of expedition measurements of the set of physical-chemical characteristics of atmospheric aerosol in areas of the Arctic and Far East seas, performed onboard RV Akademik Fedorov (17 August-22 September 2013) and RV Professor Khljustin (24 July-7 September 2013). The specific features of spatial distribution and time variations of aerosol optical depth (AOD) of the atmosphere in the wavelength range of 0.34-2.14 µm and boundary layer height, aerosol and black carbon mass concentrations, and disperse and chemical composition of aerosol are discussed. Over the Arctic Ocean (on the route of RV Akademik Fedorov) there is a decrease in aerosol and black carbon concentrations in a northeastern direction: higher values were observed in the region of Spitsbergen and near the Kola Peninsula; and minimum values were observed at northern margins of the Laptev Sea. Average AOD (0.5 µm) values in this remote region were 0.03; the aerosol and black carbon mass concentrations were 875 and 22 ng m −3 , respectively. The spatial distributions of most aerosol characteristics over Far East seas show their latitudinal decrease in the northern direction. On transit of RV Professor Khljustin from the Japan Sea to the Chukchi Sea, the aerosol number concentration decreased on average from 23.7 to 2.5 cm −3 , the black carbon mass concentration decreased from 150 to 50 ng m −3 , and AOD decreased from 0.19 to 0.03. We analyzed the variations in the boundary layer height, measured by ship-based lidar: the average value was 520 m, and the maximal value was 1200 m. In latitudinal distribution of the boundary layer height, there is a characteristic minimum at a latitude of ∼ 55 • N. For water basins of eight seas, we present the chemical compositions of the water-soluble aerosol fraction (ions, elements) and small gasphase species, as well as estimates of their vertical fluxes. It is shown that substances are mainly (75-89 %) supplied from the atmosphere to the sea surface together with gas-phase species. The deposited ions account for from 11 to 24.5 %, and trace elements account for 0.2-0.4 % of the total sum of water-soluble components. The average vertical fluxes of aerosol substance are a factor of 4-7 larger in the Japan Sea than in the water basins of Arctic seas.

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On results of studies of atmospheric aerosol optical depth in arctic regions

Cited by 17 publications

References 12 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

Specific features of spatial distribution of atmospheric aerosol optical depth along northern sea route

On measurements of aerosol-gas composition of the atmosphere during two expeditions in 2013 along the Northern Sea Route

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