scholarly journals Black Carbon Particles Do Not Matter for Immersion Mode Ice Nucleation

2020 ◽  
Vol 47 (11) ◽  
Author(s):  
Zamin A. Kanji ◽  
André Welti ◽  
Joel C. Corbin ◽  
Amewu A. Mensah
Keyword(s):  
Black Carbon ◽  
Ice Nucleation ◽  
Carbon Particles

Does Hydrophilicity of Carbon Particles Improve Their Ice Nucleation Ability?

2014 ◽  
Vol 118 (35) ◽  
pp. 7330-7337 ◽  
Author(s):  
Laura Lupi ◽  
Valeria Molinero
Keyword(s):  
Ice Nucleation ◽  
Carbon Particles

scholarly journals Measurement of Light Absorbing Aerosols with Folded-Jamin Photothermal Interferometry

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2615 ◽  
Author(s):  
Jeonghoon Lee ◽  
Hans Moosmüller
Keyword(s):  
Refractive Index ◽  
Black Carbon ◽  
Metropolitan Area ◽  
Atmospheric Aerosols ◽  
Urban Areas ◽  
Photothermal Spectroscopy ◽  
Interferometric Technique ◽  
Carbon Particles ◽  
Black Carbon Aerosol ◽  
Absorbing Aerosols

In this study, a photothermal interferometer was developed, based on a folded-Jamin polarization instrument with refractive-index sensitive configuration, in order to characterize light-absorbing aerosols. The feasibility of our interferometric technique was demonstrated by performing photothermal spectroscopy characterizing spark-generated black carbon particles with atmospherically relevant concentrations and atmospheric aerosols in a metropolitan area. The sensitivity of this interferometric system for both laboratory-generated aerosols and atmospheric aerosols was ~ 1 (μg/m3)/μV, which is sufficient for the monitoring of black carbon aerosol in urban areas.

scholarly journals Influences of Primary Emission and Secondary Coating Formation on the Particle Diversity and Mixing State of Black Carbon Particles

2019 ◽  
Vol 53 (16) ◽  
pp. 9429-9438 ◽  
Author(s):  
Alex K.Y. Lee ◽  
Laura-Hélèna Rivellini ◽  
Chia-Li Chen ◽  
Jun Liu ◽  
Derek J. Price ◽  
...  
Keyword(s):  
Black Carbon ◽  
Mixing State ◽  
Carbon Particles ◽  
Coating Formation

scholarly journals Laboratory study of the heterogeneous ice nucleation on black-carbon-containing aerosol

2019 ◽  
Vol 19 (19) ◽  
pp. 12175-12194 ◽  
Author(s):  
Leonid Nichman ◽  
Martin Wolf ◽  
Paul Davidovits ◽  
Timothy B. Onasch ◽  
Yue Zhang ◽  
...  
Keyword(s):  
Carbon Black ◽  
Black Carbon ◽  
Field Studies ◽  
Ice Nucleation ◽  
Ice Crystals ◽  
Published Data ◽  
Laboratory Measurements ◽  
Ethylene Flame ◽  
Nucleation Activity ◽  
Ice Nucleation Activity

Abstract. Soot and black carbon (BC) particles are generated in the incomplete combustion of fossil fuels, biomass, and biofuels. These airborne particles affect air quality, human health, aerosol–cloud interactions, precipitation formation, and climate. At present, the climate effects of BC particles are not well understood. Their role in cloud formation is obscured by their chemical and physical variability and by the internal mixing states of these particles with other compounds. Ice nucleation in field studies is often difficult to interpret. Nonetheless, most field studies seem to suggest that BC particles are not efficient ice-nucleating particles (INPs). On the other hand, laboratory measurements show that in some cases, BC particles can be highly active INPs under certain conditions. By working with well-characterized BC particles, our aim is to systematically establish the factors that govern the ice nucleation activity of BC. The current study focuses on laboratory measurements of the effectiveness of BC-containing aerosol in the formation of ice crystals in temperature and ice supersaturation conditions relevant to cirrus clouds. We examine ice nucleation on BC particles under water-subsaturated cirrus cloud conditions, commonly understood as deposition-mode ice nucleation. We study a series of well-characterized commercial carbon black particles with varying morphologies and surface chemistries as well as ethylene flame-generated combustion soot. The carbon black particles used in this study are proxies for atmospherically relevant BC aerosols. These samples were characterized by electron microscopy, mass spectrometry, and optical scattering measurements. Ice nucleation activity was systematically examined in temperature and saturation conditions in the ranges of 217≤T≤235 K and 1.0≤Sice≤1.5 and 0.59≤Swater≤0.98, respectively, using a SPectrometer for Ice Nuclei (SPIN) instrument, which is a continuous-flow diffusion chamber coupled with instrumentation to measure light scattering and polarization. To study the effect of coatings on INPs, the BC-containing particles were coated with organic acids found in the atmosphere, namely stearic acid, cis-pinonic acid, and oxalic acid. The results show significant variations in ice nucleation activity as a function of size, morphology, and surface chemistry of the BC particles. The measured ice nucleation activity dependencies on temperature, supersaturation conditions, and the physicochemical properties of the BC particles are consistent with an ice nucleation mechanism of pore condensation followed by freezing. Coatings and surface oxidation modify the initial formation efficiency of pristine ice crystals on BC-containing aerosol. Depending on the BC material and the coating, both inhibition and enhancement in INP activity were observed. Our measurements at low temperatures complement published data and highlight the capability of some BC particles to nucleate ice under low ice supersaturation conditions. These results are expected to help refine theories relating to soot INP activation in the atmosphere.

12 O 02 Formation of sulfate on black carbon particles

1993 ◽  
Vol 24 ◽  
pp. S71-S72
Author(s):  
V. Ulevičius ◽  
A. Girgẑdys ◽  
S. Trakumas
Keyword(s):  
Black Carbon ◽  
Carbon Particles

State of mixture of atmospheric submicrometer black carbon particles and its effect on particulate light absorption

2009 ◽  
Vol 43 (6) ◽  
pp. 1296-1301 ◽  
Author(s):  
Hiroaki Naoe ◽  
Shuichi Hasegawa ◽  
Jost Heintzenberg ◽  
Kikuo Okada ◽  
Akihiro Uchiyama ◽  
...  
Keyword(s):  
Black Carbon ◽  
Light Absorption ◽  
Carbon Particles
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