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1. The influence of OH concentration on SOA formation from isoprene photooxidation

Author:
Song, Min; Zhang, Chenglong; Wu, Hai; Mu, Yujing; Ma, Zhuobiao; Zhang, Yuanyuan; Liu, Junfeng; Li, Xuran
Source:
The Science of the total environment 2019 v.650 pp. 951-957
ISSN:
0048-9697
Subject:
aerosols,   etc   ; hydrogen peroxide; isoprene; photooxidation;     Show all 4 Subjects
Abstract:
... The formation of secondary organic aerosol (SOA) from isoprene photooxidation was investigated to reveal the influence of OH concentration on SOA formation through varying the concentrations of isoprene and H2O2 in a smog chamber. The results indicated that the higher the OH concentration was, the less the isoprene consumed for the detectable SOA mass concentration, for example, the lowest isopren ...
DOI:
10.1016/j.scitotenv.2018.09.084

2. Comparative efficiency of airborne pollen concentration evaluation in two pollen sampler designs related to impaction and changes in internal wind speed

Author:
Miki, Kenji; Kawashima, Shigeto; Clot, Bernard; Nakamura, Kimihito
Source:
Atmospheric environment 2019 v.203 pp. 18-27
ISSN:
1352-2310
Subject:
aerosols,   etc   ; equations; pollen; samplers; sampling; wind speed;     Show all 6 Subjects
Abstract:
... Pollen sampling has been performed using various sampling methods around the world. However, the sampling efficiencies of these methods remain unclear. In this study, we compared the sampling efficiency of a Sigma-2 two-layered aerosol sampling inlet and a Hirst-style wind vane inlet to reveal the relationship between sampling efficiency and samplers’ physical characteristics. The initial results ...
DOI:
10.1016/j.atmosenv.2019.01.039

3. Assimilation of PM2.5 ground base observations to two chemical schemes in WRF-Chem – The results for the winter and summer period

Author:
Werner, Małgorzata; Kryza, Maciej; Pagowski, Mariusz; Guzikowski, Jakub
Source:
Atmospheric environment 2019 v.200 pp. 178-189
ISSN:
1352-2310
Subject:
aerosols,   etc   ; models; particulates; statistics; summer; winter; Europe;     Show all 7 Subjects
Abstract:
... The forecasting system based on the WRF-Chem model and the GSI assimilation tool was applied for the first time over Europe. We aimed to evaluate the differences in impact of 3D-Var assimilation of PM2.5 ground base concentrations to different aerosol chemical schemes (GOCART and MADE/SORGAM) on modelled PM2.5 and PM10 concentrations and to assess the impact of data assimilation during the winter ...
DOI:
10.1016/j.atmosenv.2018.12.016

4. Comparison of secondary organic aerosol (SOA) formation during o-, m-, and p-xylene photooxidation

Author:
Zhang, Peng; Huang, Jingyun; Shu, Jinian; Yang, Bo
Source:
Environmental pollution 2019 v.245 pp. 20-28
ISSN:
0269-7491
Subject:
aerosols,   etc   ; isomers; nitric oxide; photooxidation; xylene;     Show all 5 Subjects
Abstract:
... Despite extensive effort to characterize xylene-isomer-derived secondary organic aerosols (SOAs) over the past decade, differences in SOA composition among xylene isomers, and their relative contributions to SOA formation remain poorly understood. Herein, we reinvestigated the photooxidation of o-, m-, and p-xylene under two limiting NO conditions. Dicarbonyls, TBM (the acronym of C3-trione, 2,3-b ...
DOI:
10.1016/j.envpol.2018.10.118

5. Development and application of the multi-wavelength cavity ring-down aerosol extinction spectrometer

Author:
Li, Junling; Wang, Weigang; Li, Kun; Zhang, Wenyu; Ge, Maofa; Peng, Chao
Source:
Journal of environmental sciences (China) 2019 v.76 pp. 227-237
ISSN:
1001-0742
Subject:
aerosols,   etc   ; ammonium sulfate; refractive index; spectrometers; wavelengths;     Show all 5 Subjects
Abstract:
... To better characterize the optical properties of atmospheric aerosols, the multi-wavelength cavity ring-down aerosol extinction spectrometer (MCRD-AES) is developed and applied in this study. By using tunable light source and four parallel cavities, the MCRD-AES covers a wide and atmospherically relevant wavelength range from 360 to 663 nm. Four wavelengths (375 nm, 440 nm, 532 nm, and 620 nm) are ...
DOI:
10.1016/j.jes.2018.04.030

6. Measuring personal exposure to fine particulate matter (PM2.5) among rural Honduran women: A field evaluation of the Ultrasonic Personal Aerosol Sampler (UPAS)

Author:
Pillarisetti, Ajay; Carter, Ellison; Rajkumar, Sarah; Young, Bonnie N.; Benka-Coker, Megan L.; Peel, Jennifer L.; Johnson, Michael; Clark, Maggie L.
Source:
Environment international 2019 v.123 pp. 50-53
ISSN:
0160-4120
Subject:
aerosols,   etc   ; air pollution; particulates; ultrasonics; women;     Show all 5 Subjects
Abstract:
... We measured 24-hour average personal exposure to fine particulate matter (PM2.5) among rural Honduran women using a lightweight, gravimetric monitor – the Ultrasonic Personal Aerosol Sampler (UPAS). Performance of the UPAS was compared with a commonly used gravimetric pump, cyclone, and filter sampling system. We observed strong agreement and correlation (Spearman ρ = 0.91; PM2.5 concentration ran ...
DOI:
10.1016/j.envint.2018.11.014

7. Development and evaluation of a novel personal sampler for PM1 using rotating porous media

Author:
Lai, Chane-Yu; Chao, How-Ran; Tsai, Ying I.; Huang, Xiang-Yu; Lin, Tzu-Hsien
Source:
The Science of the total environment 2019 v.682 pp. 709-718
ISSN:
0048-9697
Subject:
aerosols,   etc   ; aerodynamics; corn oil; filtration; foams; nickel; particulates; porous media;     Show all 8 Subjects
Abstract:
... A rotating filtration device (RFD) that is filled with porous media is developed for sampling particulate matter with a diameter of 1 μm or less (PM1). An experiment is conducted on a test system using corn oil as a test aerosol. The RFD was evaluated using an aerodynamic particle sizer. The results yielded cutoff sizes of 1.68 μm and 1.04 μm at rotational speeds of 0 rpm and 9000 rpm, respectivel ...
DOI:
10.1016/j.scitotenv.2019.05.086

8. Effect of air masses motion on the rapid change of aerosols in marine atmosphere

Author:
Yan, Jinpei; Lin, Qi; Zhang, Miming; Zhao, Shuhui; Chen, Liqi
Source:
Journal of environmental sciences (China) 2019 v.83 pp. 217-228
ISSN:
1001-0742
Subject:
aerosols,   etc   ; air; chemical composition; particle size; shipping; spectrometers; China;     Show all 7 Subjects
Abstract:
... The impact of air masses motion on marine aerosol properties was investigated using an on-board single particle mass spectrometer (SPAMS) deployed for the determination of single particle size resolved chemical composition over Southeast China Sea. Two aerosol blooms (E1 and E2) were observed during the cruise. High average particle number count occurred in E1 (7320), followed by E2 (5850), which ...
DOI:
10.1016/j.jes.2019.04.005

9. Temporal variations of the conduction current density during fair weather days in Israel

Author:
Yaniv, Roy; Reuveni, Yuval; Yair, Yoav; Lynn, Barry
Source:
Atmospheric research 2019 v.222 pp. 1-11
ISSN:
0169-8095
Subject:
aerosols,   etc   ; diurnal activity; diurnal variation; electric field; weather; Israel;     Show all 6 Subjects
Abstract:
... Ground-based measurements of the atmospheric conduction current density were conducted on Mount Hermon in northern Israel (33°18′N 35°47.2′E, 2050 m a.s.l). The aim was to measure the conduction current diurnal behavior during days that are defined meteorologically as fair weather days. Results from 86 selected fair weather days show an average value of 0.9 pA/m2 downward, and a double oscillation ...
DOI:
10.1016/j.atmosres.2019.02.003

10. Observations on the distribution of clouds over northern India using joint CloudSat and CALIPSO measurements

Author:
Kumar, Ashish; Singh, Narendra; Singh, Anshumali
Source:
Remote sensing letters 2019 v.10 no.6 pp. 590-597
ISSN:
2150-7058
Subject:
aerosols,   etc   ; lidar; monsoon season; remote sensing; satellites; seasonal variation; India;     Show all 7 Subjects
Abstract:
... A detailed study on the distribution of basic cloud types over the northern states of India (NSI) is performed using the decadal (2007–2016) raDAR-liDAR (DARDAR) data, which facilitates merged CloudSat and Cloud aerosol liDAR infrared pathfinder satellite observations (CALIPSO) observations onto the high resolution matched geographical grid points. The study demonstrates the seasonal variations, w ...
DOI:
10.1080/2150704X.2019.1587198

11. Modeled aerosol-cloud indirect effects and processes based on an observed partially glaciated marine deep convective cloud case

Author:
Kudzotsa, Innocent; Dobbie, Steven; Phillips, Vaughan
Source:
Atmospheric environment 2019 v.204 pp. 12-21
ISSN:
1352-2310
Subject:
aerosols,   etc   ; atmospheric chemistry; droplets; ice; models; radiative forcing; snow;     Show all 7 Subjects
Abstract:
... A tropical maritime case of deep convective clouds was studied using a state-of-the-art aerosol-cloud model in order to evaluate the microphysical mechanisms of aerosol indirect effects (AIE). The aerosol-cloud scheme used is a hybrid bin/bulk model, which treats all phases of clouds and precipitation allowing a detailed analysis of process-level aerosol indirect effects on targeted cloud types. F ...
DOI:
10.1016/j.atmosenv.2019.02.010

12. Differences of the oxidation process and secondary organic aerosol formation at low and high precursor concentrations

Author:
Chen, Tianzeng; Liu, Yongchun; Chu, Biwu; Liu, Changgeng; Liu, Jun; Ge, Yanli; Ma, Qingxin; Ma, Jinzhu; He, Hong
Source:
Journal of environmental sciences (China) 2019 v.79 pp. 256-263
ISSN:
1001-0742
Subject:
aerosols,   etc   ; air quality; gases; models; oxidants; oxidation; volatile organic compounds;     Show all 7 Subjects
Abstract:
... Current atmospheric quality models usually underestimate the level of ambient secondary organic aerosol (SOA), one of the possible reasons is that the precursors at different concentrations may undergo different oxidation processes and further affect SOA formation. Therefore, there is a need to perform more chamber studies to disclose the influence. In this work, SOA formation over a wide range of ...
DOI:
10.1016/j.jes.2018.11.011

13. Disentangling the influence of local and remote anthropogenic aerosols on South Asian monsoon daily rainfall characteristics

Author:
Singh, Deepti; Bollasina, Massimo; Ting, Mingfang; Diffenbaugh, Noah S.
Source:
Climate dynamics 2019 v.52 no.9-10 pp. 6301-6320
ISSN:
0930-7575
Subject:
aerosols,   etc   ; climate; climate models; emissions; monsoon season; rain; summer; India;     Show all 8 Subjects
Abstract:
... Wet and dry periods within the South Asian summer monsoon season can have acute societal impacts. Recent studies have identified changes in daily rainfall characteristics of the monsoon, but the underlying causes are poorly understood. In particular, although the dominant role of anthropogenic aerosols in shaping historical changes in seasonal-mean monsoon rainfall has been documented, their influ ...
DOI:
10.1007/s00382-018-4512-9

14. Extreme gradient boosting model to estimate PM2.5 concentrations with missing-filled satellite data in China

Author:
Chen, Zhao-Yue; Zhang, Tian-Hao; Zhang, Rong; Zhu, Zhong-Min; Yang, Jun; Chen, Ping-Yan; Ou, Chun-Quan; Guo, Yuming
Source:
Atmospheric environment 2019 v.202 pp. 180-189
ISSN:
1352-2310
Subject:
aerosols,   etc   ; data collection; models; particulates; prediction; remote sensing; satellites; China;     Show all 8 Subjects
Abstract:
... Several studies have attempted to predict ground PM2.5 concentrations using satellite aerosol optical depth (AOD) retrieval. However, over 70%–90% of aerosol retrievals are non-random missing, which limits and biases the estimation. To the best of our knowledge, this issue has not been well resolved to date.The aim of this study was to develop an interpolation technique to handle the missing data ...
DOI:
10.1016/j.atmosenv.2019.01.027

15. Assessment of aerosol–cloud–radiation correlations in satellite observations, climate models and reanalysis

Author:
Bender, F. A.-M.; Frey, L.; McCoy, D. T.; Grosvenor, D. P.; Mohrmann, J. K.
Source:
Climate dynamics 2019 v.52 no.7-8 pp. 4371-4392
ISSN:
0930-7575
Subject:
aerosols,   etc   ; climate; climate models; droplets; rain; satellites; water content;     Show all 7 Subjects
Abstract:
... Representing large-scale co-variability between variables related to aerosols, clouds and radiation is one of many aspects of agreement with observations desirable for a climate model. In this study such relations are investigated in terms of temporal correlations on monthly mean scale, to identify points of agreement and disagreement with observations. Ten regions with different meteorological ch ...
DOI:
10.1007/s00382-018-4384-z

16. Estimation of spatiotemporal PM1.0 distributions in China by combining PM2.5 observations with satellite aerosol optical depth

Author:
Zang, Lin; Mao, Feiyue; Guo, Jianping; Wang, Wei; Pan, Zengxin; Shen, Huanfeng; Zhu, Bo; Wang, Zemin
Source:
The Science of the total environment 2019 v.658 pp. 1256-1264
ISSN:
0048-9697
Subject:
aerosols,   etc   ; algorithms; models; particulates; remote sensing; satellites; winter; China;     Show all 8 Subjects
Abstract:
... Particulates smaller than 1.0 μm (PM1.0) have strong associations with public health and environment, and considerable exposure data should be obtained to understand the actual environmental burden. This study presented a PM1.0 estimation strategy based on the generalised regression neural network model. The proposed strategy combined ground-based observations of PM2.5 and satellite-derived aeroso ...
DOI:
10.1016/j.scitotenv.2018.12.297

17. Infrequent new particle formation over the remote boreal forest of Siberia

Author:
Wiedensohler, A.; Ma, N.; Birmili, W.; Heintzenberg, J.; Ditas, F.; Andreae, M.O.; Panov, A.
Source:
Atmospheric environment 2019 v.200 pp. 167-169
ISSN:
1352-2310
Subject:
aerosols,   etc   ; anthropogenic activities; boreal forests; troposphere; vapors; Siberia;     Show all 6 Subjects
Abstract:
... Aerosol particle number size distributions (PNSD) were investigated to verify, if extremely low-volatility organic vapors (ELVOC) from natural sources alone could induce new particle formation and growth events over the remote boreal forest region of Siberia, hundreds of kilometers away from significant anthropogenic sources. We re-evaluated observations determined at a height of 300 m of the remo ...
DOI:
10.1016/j.atmosenv.2018.12.013

18. Cutting floating single-walled carbon nanotubes with a ‘CO2 blade’

Author:
Tian, Ying; Wei, Nan; Laiho, Patrik; Ahmad, Saeed; Magnin, Yann; Liao, Yongping; Bichara, Christophe; Jiang, Hua; Kauppinen, Esko I.
Source:
Carbon 2019 v.143 pp. 481-486
ISSN:
0008-6223
Subject:
aerosols,   etc   ; carbon; carbon dioxide; carbon nanotubes; cutting; dry deposition; gases;     Show all 7 Subjects
Abstract:
... Uniform ultra-short (<100 nm) single-walled carbon nanotubes (SWCNTs) with properties of rich chemistry, high dispersity and easy manipulation, are of great importance for constructing novel nano-structures and highly integrated miniature devices. Herein, we report a recent breakthrough in cutting long SWCNTs into uniform ultra-short segments in gas-phase using CO2 as a ‘blade.’ SWCNTs synthesized ...
DOI:
10.1016/j.carbon.2018.11.035

19. Recovery of resin acids from fast pyrolysis of pine

Author:
Kim, Kwang Ho; Daugaard, Tannon J.; Smith, Ryan; Mba-Wright, Mark; Brown, Robert C.
Source:
Journal of analytical and applied pyrolysis 2019 v.138 pp. 132-136
ISSN:
0165-2370
Subject:
aerosols,   etc   ; Pinus; biofuels; fluidized beds; pyrolysis; resin acids; temperature; wood;     Show all 8 Subjects
Abstract:
... The potential recovery of resin acids from the fast pyrolysis of pine was assessed using both a batch micropyrolyzer and continuous fluidized bed reactor. Fast pyrolysis in the micropyrolyzer was conducted at 200 to 600 °C to determine the optimal pyrolysis temperature for the recovery of resin acids from pine. Maximum yield of resin acids occurred at 500 °C. Pyrolysis in a continuous fluidized be ...
DOI:
10.1016/j.jaap.2018.12.016

20. Highly Oxygenated Organic Molecules (HOM) from Gas-Phase Autoxidation Involving Peroxy Radicals: A Key Contributor to Atmospheric Aerosol

Author:
Bianchi, Federico; Kurtén, Theo; Riva, Matthieu; Mohr, Claudia; Rissanen, Matti P.; Roldin, Pontus; Berndt, Torsten; Crounse, John D.; Wennberg, Paul O.; Mentel, Thomas F.; Wildt, Jürgen; Junninen, Heikki; Jokinen, Tuija; Kulmala, Markku; Worsnop, Douglas R.; Thornton, Joel A.; Donahue, Neil; Kjaergaard, Henrik G.; Ehn, Mikael
Source:
Chemical reviews 2019 v.119 no.6 pp. 3472-3509
ISSN:
1520-6890
Subject:
aerosols,   etc   ; autoxidation; free radicals; gases; physicochemical properties; volatile organic compounds;     Show all 6 Subjects
Abstract:
... Highly oxygenated organic molecules (HOM) are formed in the atmosphere via autoxidation involving peroxy radicals arising from volatile organic compounds (VOC). HOM condense on pre-existing particles and can be involved in new particle formation. HOM thus contribute to the formation of secondary organic aerosol (SOA), a significant and ubiquitous component of atmospheric aerosol known to affect th ...
DOI:
10.1021/acs.chemrev.8b00395