Characterization of individual fine-fraction particles from the Arctic aerosol at Spitsbergen, May–June 1987

1992 ◽  
Vol 26 (9) ◽  
pp. 1747-1762 ◽  
Author(s):  
James R. Anderson ◽  
Peter R. Buseck ◽  
Daniel A. Saucy ◽  
Josef M. Pacyna
Keyword(s):  
Fine Fraction ◽  
The Arctic ◽  
Arctic Aerosol

scholarly journals Characterization of the cloud microphysical and optical properties and aerosol-cloud interaction in the Arctic from in situ ground-based measurements during the CLIMSLIP-NyA campaign, Svalbard

2017 ◽  
Author(s):  
Gwennolé Guyot ◽  
Frans Olofson ◽  
Peter Tunved ◽  
Christophe Gourbeyre ◽  
Guy Fevbre ◽  
...  
Keyword(s):  
Indirect Effect ◽  
Climate Models ◽  
Droplet Diameter ◽  
Arctic Region ◽  
The Arctic ◽  
Blowing Snow ◽  
Aerosol Cloud ◽  
Arctic Aerosol

Abstract. This study will focus on cloud microphysical and optical characterization of three different types of episodes encountered during the ground based CLIMSLIP-NyA campaign performed in Ny-Alesund, Svalbard: the Mixed Phase Cloud (MPC), snow precipitation and Blowing Snow (BS) events. These in situ cloud measurements will be combined with aerosol measurements and air mass backtrajectory simulations to qualify and parameterize the arctic aerosol cloud interaction and to assess the influence of anthropogenic pollution transported into the Arctic. The results show a cloud bimodal distribution with the droplet mode at 10 µm and the crystal mode centered at 250 µm, for the MPC cases. The precipitation cases presents a crystal distribution centered around 350 µm with mostly of dendritic shape. The BS cases show a higher concentration but smaller crystals, centered between 150 and 200 µm, with mainly irregular crystals. A polluted case, where aerosol properties are influenced by anthropogenic emission from Europe and East Asia, was compared to a clean case with local aerosol sources. These anthropogenic emissions seem to cause higher Black Carbon, aerosol and droplet concentrations, a more pronounced accumulation mode, smaller droplet sizes and a higher activation fraction Fa. Moreover, the activation diameter decreases as the droplet diameter increases and Fa increases showing that smaller particles are activated and droplets grow when the aerosol number decreases. This is in agreement with the first (Twomey) and second (Albrecht) aerosol indirect effect. The quantification of the variations of droplet concentration and size leads to IE (Indirect Effect) and NE (Nucleation Efficiency) coefficients values around 0.2 and 0.43, respectively. These values are close to those found by other studies in the arctic region which confirms these parameterizations of arctic aerosol-cloud interaction in climate models.

Radiative properties of the arctic aerosol

1982 ◽  
Vol 16 (12) ◽  
pp. 2967-2977 ◽  
Author(s):  
E.M Patterson ◽  
B.T Marshall ◽  
K.A Rahn
Keyword(s):  
Radiative Properties ◽  
The Arctic ◽  
Arctic Aerosol

Layer charge of expandable 2:1 phyllosilicates in selected parent materials of some Canadian soils

1994 ◽  
Vol 74 (3) ◽  
pp. 291-299 ◽  
Author(s):  
J. M. Arocena ◽  
S. Pawluk ◽  
M. J. Dudas
Keyword(s):  
Cell Layer ◽  
Glacial Till ◽  
Beach Sand ◽  
The Arctic ◽  
Layer Charge ◽  
Detailed Characterization ◽  
Tetrahedral Sheet ◽  
Parent Materials ◽  
The Mean

We investigated the nature of the layer charge of the different expandable 2:1 phyllosilicates present in glacial till, marine sediment, beach sand, loess, weathered sandstone and acid shale parent materials of selected soils from the arctic, alpine and interior plateau regions of Canada. Detailed characterization of 2:1 clay minerals, using the layer charge, was done by intercalation of the clay fractions with different chains (nc = 6 to 18) of n-alkylammonium cations (AC).Results indicated that AC were able to detect a mixture of smectite and vermiculite that was not detected by previous studies, using the glycerol (GLY) and ethylene glycol (EG) solvation techniques. The mean unit cell layer charge [in mol(+)/Si,Al)4O10)] varies from 0.30 to 0.39 for the smectite and from 0.71 to 0.74 for vermiculite. Vermiculite from the beach sand is trioctahedral in which most of the charge is located in the tetrahedral sheet, while vermiculite in the weathered sandstone is dioctahedral in which part of the charge originates from the octahedral layers. The presence of smectite, associated with the weathering of chlorite and an expanding component associated with the degradation of biotite, was also observed. Key words:n-alkylammonium cations, mean layer charge, 2:1 phyllosilicates

scholarly journals Morphological and molecular characterization of Sarcocystis arctica-like sarcocysts from the Arctic fox (Vulpes lagopus) from Alaska, USA

2017 ◽  
Vol 116 (7) ◽  
pp. 1871-1878 ◽  
Author(s):  
Camila K. Cerqueira-Cézar ◽  
Peter C. Thompson ◽  
Shiv Kumar Verma ◽  
Joseph Mowery ◽  
Rafael Calero-Bernal ◽  
...  
Keyword(s):  
Molecular Characterization ◽  
The Arctic ◽  
Arctic Fox ◽  
Vulpes Lagopus ◽  
Morphological And Molecular Characterization ◽  
Sarcocystis Arctica

scholarly journals Complex Characterization of Fine Fraction and Source Contribution to PM2.5 Mass at an Urban Area in Central Europe

Atmosphere ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1085
Author(s):  
Lucyna Samek ◽  
Anna Turek-Fijak ◽  
Alicja Skiba ◽  
Przemyslaw Furman ◽  
Katarzyna Styszko ◽  
...  
Keyword(s):  
Fine Particles ◽  
Chemical Constituents ◽  
Fine Fraction ◽  
Urban Site ◽  
Particulate Pollution ◽  
Input Dataset ◽  
Physical And Chemical ◽  
The City ◽  
Careful Comparison

It is well documented that Southern Poland is one of the most polluted areas in Europe due to the highest airborne concentrations of particulate matter (PM). Concentrations of fine particles are especially high in winter. Apart from detailed number concentrations, it is essential to accurately identify and quantify specific particulate pollution sources. Only a few Polish research centers are involved in such experiments—among them is Krakow research group. For the most part, research focuses on collecting 24-h average samples from stationary PM samplers at ambient monitoring sites and quantifying the specific elements and chemical constituents in PM. This approach includes modeling methods that can use the variability in physical and chemical PM characteristics as an input dataset to identify possible sources of the particles. The objective of this paper is to provide research results based on data collected from June 2018 to May 2019 from a single monitoring station at a central urban site. Careful comparison of data obtained prior to a 2019 law prohibiting solid fuel burning in the city of Krakow with data (2019–2020) when a regulation went into effect should indicate progress by noting lower PM levels. This work has shown that the method applied and Krakow results might be of interest to the broader community in regions of high PM concentration.

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