2014 iAREA campaign on aerosol in Spitsbergen – Part 2: Optical properties from Raman-lidar and in-situ observations at Ny-Ålesund

Ritter, Ch.; Neuber, Roland; Schulz, Alexander; Markowicz, Krzysztof M.; Stachlewska, Iwona S.; Lisok, Justyna; Makuch, Przemysław; Pakszys, Paulina; Markuszewski, Piotr; Rozwadowska, Anna; Petelski, Tomasz; Zieliński, Tymon; Becagli, Silvia; Udisti, Roberto; Gausa, Michael

doi:10.1016/j.atmosenv.2016.05.053

Cited by 26 publications

(24 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular the hourly mean values of the scattering coefficient (μ s ) at 550 nm range from less than 1 to 133 Mm −1 (Figure 7a), while those of the absorption coefficient (μ a ) at 467, 530, and 660 nm range from 0.25 to 21 Mm −1 , from 0.25 to 17 Mm −1 , and from 0.24 to 13 Mm −1 , respectively ( Figure 7b). While μ s and μ a values measured in P2 are comparable to those in other polar regions, those collected during P1 are remarkably higher (Aaltonen et al, 2006;Tomasi et al, 2007;McNaughton et al, 2011;Ritter et al, 2016;Pakszys & Zielinski, 2017). In particular data of 10 July are in good accordance with literature data of BB aerosol (e.g., Hopkins et al, 2007;Reid et al, 2005).…”

Section: The Bb Eventsupporting

confidence: 87%

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: The Bb Eventsupporting

confidence: 87%

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…There have been attempts to apply lidar to observe tropospheric aerosols in the high Arctic (e.g., Ishii et al, ; Ishii et al, ; Leaitch et al, ; Ritter et al, ). However, most attempts have been limited to certain periods of time during the year.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variations in High Arctic Free Tropospheric Aerosols Over Ny‐Ålesund, Svalbard, Observed by Ground‐Based Lidar

et al. 2018

View full text Add to dashboard Cite

Free tropospheric aerosols over the high Arctic were observed by lidar for about 4 years from March 2014 at Ny-Ålesund (78. 9°N, 11.9°E). Vertical profiles of aerosol backscattering coefficients at two wavelengths, 532 and 1,064 nm, and depolarization ratio at one wavelength, 532 nm, are derived from these observations. The aerosol backscattering coefficient, the particle depolarization ratio, and the color ratio (the ratio of the backscattering coefficients at the two wavelengths) are roughly proportional to mass concentration, nonsphericity, and size of the aerosol particles, respectively. The aerosol backscattering coefficients indicate that monthly averaged concentration of aerosols was largest in the lowest free troposphere at about 1 km in altitude and was an order of magnitude less at an about 10 km in altitude and that the concentration of aerosols was highest from late spring to summer and lowest from late summer to fall. The depolarization ratio was less than a few percent in the troposphere during the four observed years. The depolarization ratio and the color ratio were greatest from winter to spring and smallest from summer to fall. The maxima in the monthly averaged nonsphericity and size precede the maxima in the monthly averaged concentration by a few months, indicating a seasonal change in the morphology or the characteristics of the aerosol particles. The small particle depolarization ratio of less than a few percent is consistent with previous findings that Arctic free tropospheric aerosol particles in spring are composed of a mixture of liquid phase sulfate and soot particles.Space-borne instruments, such as the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) onboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellite or the Stratospheric Gas Experiment (SAGE), provide observations of the global distribution of aerosols, including in the Arctic region, and their temporal variations. Observations of the Arctic region from space, however, are significantly affected by its unique condition of having very different background solar radiation levels

show abstract

“…With the Lidar ratio, LR = 30 [37], the aerosol extinction α aer can be calculated from Lidar data, as well. This was used as an indicator of the comparability of both instruments.…”

Section: Case Study: Sun Photometer-lidarmentioning

confidence: 99%

“…Furthermore, the cases "dry" and "wet" air were distinguished using relative humidity >90% for at least 6 h as a limit and divided between arrival altitudes at 500 m, 1000 m, and 1500 m over Zeppelin Station, Ny-Ålesund. As is known from Lidar observations, the Arctic haze phenomenon usually occurs in the lower troposphere [17,37]. The number of measurements for the so-called "wet" case was much less than for "dry" ones either because the aerosol advection intrinsically occurs in dry air or due to the clear sky bias in the instrument.…”

Section: Aerosol Sources and Sinksmentioning

confidence: 99%

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

Graßl

Ritter

2019

Remote Sensing

View full text Add to dashboard Cite

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.

show abstract

2014 iAREA campaign on aerosol in Spitsbergen – Part 2: Optical properties from Raman-lidar and in-situ observations at Ny-Ålesund

Cited by 26 publications

References 39 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)

Seasonal Variations in High Arctic Free Tropospheric Aerosols Over Ny‐Ålesund, Svalbard, Observed by Ground‐Based Lidar

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

Contact Info

Product

Resources

About