Microphysical properties and radiative impact of an intense biomass
                        burning aerosol event measured over Ny-Ålesund, Spitsbergen in July
                        2015

Ritter, Christoph; Burgos, M.A.; Böckmann, Christine; Mateos, David; Lisok, Justyna; Markowicz, Krzysztof M.; Moroni, Beatrice; Cappelletti, David; Udisti, Roberto; Maturilli, Marion; Neuber, Roland

doi:10.1080/16000889.2018.1539618

Cited by 20 publications

(20 citation statements)

References 55 publications

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“…During P2 the index of refraction is almost constant in time, despite high relative humidity of the surrounding air between 12 and 15 July (Figure b). Our refractive index on 10 July is in good agreement to lidar data for that same day in 2 km to 3.4 km altitude (Ritter et al, ). Nevertheless, Wandinger et al () derived higher values of the complex refractive index, ranging from 1.56–1.66 in real part and from 0.05–0.07 i in imaginary part for aged BB aerosol.…”

Section: Resultssupporting

confidence: 90%

“…Therefore, and according to our previous observations (Ferrero et al, ; Moroni et al, ), some particle aging may be due not only to long‐range transport but also to the stationing of the BB particles at different height inside or above the PBL. The layered structure of the troposphere, seen, for example, by lidar (Ritter et al, ), indicates missing vertical mixing and suggests different aerosols properties at different altitudes.…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, we consider an exceptional BB event from Alaska registered at Ny‐Ålesund, Svalbard Islands, in July 2015. The transport event was very strong with remarkable direct effects on the atmospheric dynamics, regional radiative budget, optical properties, and weather forecast (Lisok et al, ; Markowicz et al, ; Nikonovas et al, ; Ritter et al, ). In a previous paper (Moroni et al, ) the morphochemical characteristics of the aerosol particles were analyzed in a selected short time span in the central part of the event.…”

Section: Introductionmentioning

confidence: 99%

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Individual Particle Characteristics, Optical Properties and Evolution of an Extreme Long‐Range Transported Biomass Burning Event in the European Arctic (Ny‐Ålesund, Svalbard Islands)

et al. 2020

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This paper reports an exceptional biomass burning (BB) advection event from Alaska registered at Ny‐Ålesund from 10 to 17 July 2015 with particular interest on the influence of the airborne particle characteristics on the optical properties of the aerosol during the event. To this purpose we considered two DEKATI 12‐stage aerosol samples spanning the entire advection and analyzed them by scanning electron microscopy techniques. Aerosol chemical data and microphysical properties were also evaluated in order to correlate any change of individual particle characteristics with the bulk properties of the aerosol. The results of individual particle analysis depict a complex event characterized by a first phase (P1) of massive input of BB carbonaceous particles (i.e., tar balls, popcorn refractory particles, and organic particles), and by a second phase (P2) dominated by inorganic salts. The peculiar feature of this BB event is the exceptionally large grain size of the subspherical organic particles at the beginning of the event with respect to the background. At these conditions a significant increase of the scattering efficiency may occur even for a small increase of the size parameter. Results of the simulation of the complex refractive indices (n‐ik) confirm this evaluation. Aerosol evolution during the event resulted from the combination of three distinct occurrences: (a) progressive rotation of air mass circulation toward non‐BB source areas, (b) development of a thick fog layer in the planetary boundary layer, and (c) sea salt spray direct advection of local/regional provenance.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Individual Particle Characteristics, Optical Properties and Evolution of an Extreme Long‐Range Transported Biomass Burning Event in the European Arctic (Ny‐Ålesund, Svalbard Islands)

et al. 2020

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“…Using the theory of Raman scattering, providing independent information of the aerosol extinction, gives the opportunity of a reliable intensive optical properties retrieval. In the literature one can find a variety of analysis of different aerosol types properties observed during the special cases of advection (Ortiz-Amezcua et al, 2017;Ritter et al, 2018), measurements campaigns (Tesche et al, 2011;Groß et al, 2015;Chazette et al, 2016) and also the climatological studies at specific stations or within the research network, where the standard requirement of lidar profiles should be fulfilled (Amiridis et al, 2005;Sicard et al 2011;Marinou et al, 2017). In many studies the lidar measurements are assisted by the other instruments to increase the research quality and reliability.…”

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confidence: 99%

Properties of biomass burning aerosol mixtures derived at fine temporal and spatial scales from Raman lidar measurements: Part I optical properties

Janicka

Stachlewska

2019

Preprint

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Abstract. The analysis of the aerosol optical properties derived at fine temporal and spatial scales were performed based on measurements obtained during heat wave event in vicinity of a cold weather front in Warsaw on August 9th&ndash;11th, 2015. The signals collected by the PollyXT-UW lidar allowed for the calculation of 23 sets of so-called 3&beta;&thinsp;+&thinsp;2&alpha;&thinsp;+&thinsp;2&delta;&thinsp;+&thinsp;wv profiles averaged by 30-minutes periods during 2 nights. The total number of 11 different aerosol types and aerosol mixtures were identified with reference to properties within 116 sub-layers in the profiles and were characterized by the mean values. The statistical sample of various optical properties being in agreement for consecutive profiles allowed to assess the spatio-temporal extent of aerosol/mixture types. The mean lidar ratio values of 53&ndash;73&thinsp;sr (355&thinsp;nm) and 31&ndash;45&thinsp;sr (532&thinsp;nm) in the layers dominated by the anthropogenic pollution were found. For the layers dominated by the biomass burning aerosol (fresh, moderately fresh, moderately aged) mean lidar ratio was of 69&ndash;114&thinsp;sr (355&thinsp;nm) and 57&ndash;85&thinsp;sr (532&thinsp;nm). The colour ratio of lidar ratio (532&thinsp;/&thinsp;355) higher than 1, characteristic for aged biomass burning aerosol, was found only in one scattered layer, accompanying with low value of extinction related Ångström exponent of 0.60&thinsp;&plusmn;&thinsp;0.32 and low particle depolarization ratio. The maximum of the particle depolarization ratio of 4.8&ndash;5.0&thinsp;% at 532&thinsp;nm were observed in a layer likely contaminated with pollen and in a layer dominated by fresh biomass burning aerosol. This study provides an excellent data set for exploration of separation algorithms, aerosol typing algorithms and microphysical inversion.

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“…Sources for this kind of aerosol can be biomass burning or marine bionic sulfur emission. In Lidar profiles, such events are shown as individual layers [41]. whereas, the Arctic haze appeared as a constantly higher AOD 500 over the whole part of the lower troposphere [39].…”

Section: Histograms Of Aerosol Load and Propertiesmentioning

confidence: 98%

Properties of Arctic Aerosol Based on Sun Photometer Long-Term Measurements in Ny-Ålesund, Svalbard

Graßl

Ritter

2019

Remote Sensing

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On the basis of sun photometer measurements located at the German-French polar research base AWIPEV in 11.928 • E), Svalbard, long-term changes (2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017) of aerosol properties in the European Arctic are analyzed with the main focus on physical aerosol properties like Aerosol Optical Depth (AOD) and the Ångström exponent during the Arctic haze season in spring compared with summer and autumn months. In order to gain more information from the photometer data and to reduce the error of fitting the data to the Ångström law, a new approach with an Ångström exponent, which depends linearly on wavelength, is presented in this paper. With the Mie program of libRadtran, a calculator for long-and short-wave radiation through the Earth's atmosphere, artificial aerosol size distributions were created to extend the physical understanding of this modified Ångström law. Monthly means of the measured AOD of the years 1994-2017 are presented to analyze long-term changes of aerosol properties and its load. Because photometer data in general have no height information, a comparison with a Lidar located at the same site is presented. The so-obtained data are then compared with the previous Mie calculus. More homogeneous aerosol properties were found during spring and more heterogeneous in summer. To study possible aerosol sources and sinks, five-day back-trajectories were calculated with the FLEXPART model at three different arriving heights at 11 UTC in the village Ny-Ålesund. Besides the pollution pathway of the aerosol into the European Arctic based on the calculated back-trajectories, the influence of the boundary layer parameterized by the lowermost 100 hPa atmospheric layer is analyzed and compared to the measured aerosol load by the photometer in Ny-Ålesund additionally. During spring, the open ocean acts as a sink for aerosols, whereas sea ice clearly reduces their sinks. Hence, trajectories over sea ice are correlated to higher aerosol loads. Thus, both sources and sinks must be considered to understand aerosol occurrences in the Arctic.

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Microphysical properties and radiative impact of an intense biomass burning aerosol event measured over Ny-Ålesund, Spitsbergen in July 2015

Abstract: View related articles View Crossmark data Citing articles: 5 View citing articles Microphysical properties and radiative impact of an intense biomass burning aerosol event measured over Ny-Ålesund, Spitsbergen in July 2015

Cited by 20 publications

References 55 publications

Individual Particle Characteristics, Optical Properties and Evolution of an Extreme Long‐Range Transported Biomass Burning Event in the European Arctic (Ny‐Ålesund, Svalbard Islands)

Individual Particle Characteristics, Optical Properties and Evolution of an Extreme Long‐Range Transported Biomass Burning Event in the European Arctic (Ny‐Ålesund, Svalbard Islands)

Properties of biomass burning aerosol mixtures derived at fine temporal and spatial scales from Raman lidar measurements: Part I optical properties

Properties of Arctic Aerosol Based on Sun Photometer Long-Term Measurements in Ny-Ålesund, Svalbard

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