scholarly journals Chemical properties and outflow patterns of anthropogenic and dust particles on Rishiri Island during the Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia)

2003 ◽  
Vol 108 (D23) ◽  
Author(s):  
Kiyoshi Matsumoto
Keyword(s):  
Chemical Properties ◽  
Dust Particles ◽  
Asian Pacific ◽  
Aerosol Characterization

scholarly journals Adjoint inverse modeling of black carbon during the Asian Pacific Regional Aerosol Characterization Experiment

2005 ◽  
Vol 110 (D14) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. Hakami ◽  
D. K. Henze ◽  
J. H. Seinfeld ◽  
T. Chai ◽  
Y. Tang ◽  
...  
Keyword(s):  
Black Carbon ◽  
Inverse Modeling ◽  
Asian Pacific ◽  
Aerosol Characterization

scholarly journals Chemical Properties of the Individual Asian Dust Particles Clarified by Micro-PIXE Analytical System

2014 ◽  
Vol 8 (3) ◽  
pp. 154-161 ◽  
Author(s):  
Chang-Jin Ma ◽  
Gong-Unn Kang ◽  
Mikio Kasahara ◽  
Susumu Tohno
Keyword(s):  
Chemical Properties ◽  
Asian Dust ◽  
Dust Particles ◽  
Analytical System ◽  
The Individual

Influence of chemical aging on physico-chemical properties of mineral dust particles: A case study of 2016 dust storms over Delhi

2020 ◽  
Vol 267 ◽  
pp. 115338
Author(s):  
Vikas Goel ◽  
Sumit K. Mishra ◽  
Prabir Pal ◽  
Ajit Ahlawat ◽  
Narayanasamy Vijayan ◽  
...  
Keyword(s):  
Mineral Dust ◽  
Chemical Properties ◽  
Dust Storms ◽  
Dust Particles ◽  
Chemical Aging ◽  
Physico Chemical

Chemical properties of significant Asian Dust particles observed at Himeji City from November 2009 to May 2012

2017 ◽  
Vol 27 (01n02) ◽  
pp. 71-85
Author(s):  
Katsumi Saitoh ◽  
Ryouhei Nakatsubo ◽  
Takatoshi Hiraki ◽  
Masayuki Shima ◽  
Yoshiko Yoda ◽  
...  
Keyword(s):  
Loess Plateau ◽  
Analytical Data ◽  
Chemical Properties ◽  
Asian Dust ◽  
Dust Particles ◽  
Gobi Desert ◽  
The Loess Plateau ◽  
Japanese Archipelago ◽  
The Japanese Archipelago ◽  
Origin Point

In order to shed light on Asian Dust (AD) particles reaching the Japanese archipelago, we measured hourly PM[Formula: see text] and PM[Formula: see text] values by consecutive automatic monitoring during particulate matter (PM) surveillance conducted from 16 November 2009 to 14 May 2012 in Himeji City, Hyogo Prefecture, Japan, and investigated the characteristics of AD based on elemental and ionic analytical data from size-resolved PM with a one-week base sampling interval. We were able to detect three types of AD event based on the PM[Formula: see text] and PM[Formula: see text] values and the results of three-day backward trajectory analysis. The origin point of the AD events was the Gobi Desert for Event 1 and the Loess Plateau for Event 3. In the case of Event 2, AD originated in the northern Urals in Russia and reached the Japanese archipelago via the side of the Taklamakan and Gobi Deserts and through the Loess Plateau. As results of the research, it suggest that the chemical composition of AD event particles differs depending on the origin point and the course taken before reaching the Japanese archipelago.

scholarly journals Influence of surface morphology on the immersion mode ice nucleation efficiency of hematite particles

2013 ◽  
Vol 13 (9) ◽  
pp. 23757-23780
Author(s):  
N. Hiranuma ◽  
N. Hoffmann ◽  
A. Kiselev ◽  
A. Dreyer ◽  
K. Zhang ◽  
...  
Keyword(s):  
Active Sites ◽  
Chemical Properties ◽  
Atmospheric Model ◽  
Substantial Effect ◽  
Ice Nucleation ◽  
Dust Particles ◽  
Ice Crystal ◽  
Surface Irregularities ◽  
Order Of Magnitude ◽  
Expansion Cooling

Abstract. In this paper, the effect of the morphological modification of aerosol particles with respect to heterogeneous ice nucleation is comprehensively investigated for laboratory-generated hematite particles as a model substrate for atmospheric dust particles. The surface area-scaled ice nucleation efficiencies of monodisperse cubic hematite particles and milled hematite particles were measured with a series of expansion cooling experiments using the Aerosol Interaction and Dynamics in the Atmosphere (AIDA) cloud simulation chamber. Complementary off-line characterization of physico-chemical properties of both hematite subsets were also carried out with scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, dynamic light scattering (DLS), and an electro-kinetic particle charge detector to further constrain droplet-freezing measurements of hematite particles. Additionally, an empirical parameterization derived from our laboratory measurements was implemented in the single-column version of the Community Atmospheric Model version 5 (CAM5) to investigate the model sensitivity in simulated ice crystal number concentration on different ice nucleation efficiencies. From an experimental perspective, our results show that the immersion mode ice nucleation efficiency of milled hematite particles is almost an order of magnitude higher at −35.2 °C < T < −33.5 °C than that of the cubic hematite particles, indicating a substantial effect of morphological irregularities on immersion mode freezing. Our modeling results similarly show that the increased droplet-freezing rates of milled hematite particles lead to about one order magnitude higher ice crystal number in the upper troposphere than cubic hematite particles. Overall, our results suggest that the surface irregularities and associated active sites lead to greater ice activation through droplet-freezing.

scholarly journals Combined use of Mie-Raman and fluorescence lidar observations for improving aerosol characterization: feasibility experiment

2020 ◽  
Author(s):  
Igor Veselovskii ◽  
Qiaoyun Hu ◽  
Philippe Goloub ◽  
Thierry Podvin ◽  
Mikhail Korenskiy ◽  
...  
Keyword(s):  
Simultaneous Detection ◽  
High Sensitivity ◽  
Dust Particles ◽  
Fluorescence Signal ◽  
Aerosol Layer ◽  
Hygroscopic Growth ◽  
Backscattering Coefficient ◽  
Wide Range ◽  
Elastic Backscattering ◽  
Aerosol Characterization

Abstract. To study the feasibility of a fluorescence lidar for aerosol characterization, the fluorescence channel is added to LILAS – multiwavelength Mie-Raman lidar of Lille University, France. A part of fluorescence spectrum is selected by the interference filter of 44 nm bandwidth centered at 466 nm. Such an approach has demonstrated high sensitivity, allowing to detect fluorescence signal from weak aerosol layers (backscattering coefficient at 1064 nm is below 0.02 Mm−1 sr−1) up to a height of 5000 m. Simultaneous detection of nitrogen Raman and fluorescence backscatters allows to quantify the fluorescence backscattering coefficient. Observations were performed during November 2019–February 2020 period. The fluorescence capacity (ratio of fluorescence to elastic backscattering coefficients) varied in a wide range, being the highest for the smoke and the lowest for the dust particles. The fluorescence capacity depends as well strongly on the relative humidity, because the water uptake at the condition of high RH increases the elastic backscattering, without significant modification of the fluorescence. Thus, simultaneous measurements of Mie-Raman and fluorescence lidars open opportunity for the study of the particle hygroscopic growth. The fluorescence technique can be used also for monitoring the aerosol inside the cloud layers. The results presented demonstrate, that aerosol and cloud particles can be mixed both externally and internally. When the cloud is formed at the top or inside the aerosol layer (such scenario can be probably considered as internal mixing) we observed significant (up to factor 5) increase of fluorescence backscattering. Among possible mechanisms of such enhancement we can assume modification of the scattering phase function of the particles embedded in the water microspheres and the lens effect due to the water shell presence.

scholarly journals Recent progress in understanding physical and chemical properties of African and Asian mineral dust

2011 ◽  
Vol 11 (16) ◽  
pp. 8231-8256 ◽  
Author(s):  
P. Formenti ◽  
L. Schütz ◽  
Y. Balkanski ◽  
K. Desboeufs ◽  
M. Ebert ◽  
...  
Keyword(s):  
Field Experiments ◽  
Mineral Dust ◽  
Internal State ◽  
Source Region ◽  
Chemical Properties ◽  
Analytical Techniques ◽  
Dust Particles ◽  
Regional Variability ◽  
Source Regions ◽  
The Impact

Abstract. This paper presents a review of recently acquired knowledge on the physico-chemical properties of mineral dust from Africa and Asia based on data presented and discussed during the Third International Dust Workshop, held in Leipzig (Germany) in September 2008. Various regional field experiments have been conducted in the last few years, mostly close to source regions or after short-range transport. Although significant progress has been made in characterising the regional variability of dust properties close to source regions, in particular the mineralogy of iron and the description of particle shape and mixing state, difficulties remain in estimating the range of variability of those properties within one given source region. As consequence, the impact of these parameters on aerosol properties like optical properties, solubility, hygroscopicity, etc. – determining the dust impact on climate – is only partly understood. Long-term datasets in remote regions such as the dust source regions remain a major desideratum. Future work should also focus on the evolution of dust properties during transport. In particular, the prediction of the mineral dust size distribution at emission and their evolution during transport should be considered as a high-priority. From the methodological point of view, a critical assessment and standardisation of the experimental and analytical techniques is highly recommended. Techniques to characterize the internal state of mixing of dust particles, particularly with organic material, should be further developed.

scholarly journals Facility for production of ambient-like model aerosols (PALMA) in the laboratory: application in the intercomparison of automated PM monitors with the reference gravimetric method

2021 ◽  
Vol 14 (2) ◽  
pp. 1225-1238
Author(s):  
Stefan Horender ◽  
Kevin Auderset ◽  
Paul Quincey ◽  
Stefan Seeger ◽  
Søren Nielsen Skov ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Gravimetric Method ◽  
Reference Method ◽  
Ambient Air ◽  
Field Studies ◽  
Dust Particles ◽  
Ambient Aerosols ◽  
Custom Made ◽  
And Performance ◽  
Set Up

Abstract. A new facility has been developed which allows for a stable and reproducible production of ambient-like model aerosols (PALMA) in the laboratory. The set-up consists of multiple aerosol generators, a custom-made flow tube homogeniser, isokinetic sampling probes, and a system to control aerosol temperature and humidity. Model aerosols containing elemental carbon, secondary organic matter from the ozonolysis of α-pinene, inorganic salts such as ammonium sulfate and ammonium nitrate, mineral dust particles, and water were generated under different environmental conditions and at different number and mass concentrations. The aerosol physical and chemical properties were characterised with an array of experimental methods, including scanning mobility particle sizing, ion chromatography, total reflection X-ray fluorescence spectroscopy and thermo-optical analysis. The facility is very versatile and can find applications in the calibration and performance characterisation of aerosol instruments monitoring ambient air. In this study, we performed, as proof of concept, an intercomparison of three different commercial PM (particulate matter) monitors (TEOM 1405, DustTrak DRX 8533 and Fidas Frog) with the gravimetric reference method under three simulated environmental scenarios. The results are presented and compared to previous field studies. We believe that the laboratory-based method for simulating ambient aerosols presented here could provide in the future a useful alternative to time-consuming and expensive field campaigns, which are often required for instrument certification and calibration.

scholarly journals Combined use of Mie–Raman and fluorescence lidar observations for improving aerosol characterization: feasibility experiment

2020 ◽  
Vol 13 (12) ◽  
pp. 6691-6701
Author(s):  
Igor Veselovskii ◽  
Qiaoyun Hu ◽  
Philippe Goloub ◽  
Thierry Podvin ◽  
Mikhail Korenskiy ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Interference Filter ◽  
Dust Particles ◽  
Raman Lidar ◽  
Fluorescence Measurements ◽  
Combined Use ◽  
Wide Range ◽  
Elastic Backscattering ◽  
Lidar Observations ◽  
Aerosol Characterization

Abstract. To study the feasibility of a fluorescence lidar for aerosol characterization, the fluorescence channel is added to the LILAS multiwavelength Mie–Raman lidar of Lille University, France. A part of the fluorescence spectrum induced by 355 nm laser radiation is selected by the interference filter of 44 nm bandwidth centered at 466 nm. Such an approach has proved to have high sensitivity, allowing fluorescence signals from weak aerosol layers to be detected and the fluorescence backscattering coefficient from the ratio of fluorescence and nitrogen Raman backscatters to be calculated. Observations were performed during the November 2019–February 2020 period. The fluorescence capacity (ratio of fluorescence to elastic backscattering coefficients), measured under conditions of low relative humidity, varied in a wide range, being the highest for the smoke and the lowest for the dust particles. The results presented also demonstrate that the fluorescence measurements can be used for monitoring the aerosol inside the cloud layers.

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