AtmosphericDropletsCloudsDerived cloudAtmosphereMeasurementsCarbonaceous aerosolsOrganicSingle-particle2023AnthropogenicNatural aerosolsSoot particleScatterSulfateUltrafine particlesNanoparticlesBiogenicSecondaryResearchersOverall aerosolPollutionClimateObservationsAirborneEmissionsConcentrationsGenerateOxidationBlack CarbonSizeSphericalChemistryConcentration of particlesDiametersExposureMeasurementCloud propertiesParticulate matterMixtureExtinctionSensitivitySolid particlesPhysicsInvestigated the concentrationLidarSulfatesDetectionStudyMass concentrationExperimentsLund UniversityFormationVariability
Atmospheric7
- Sea salt aerosols play an important role in the radiation budget and atmospheric composition over the Arctic, where the climate is rapidly changing. (copernicus.org)
- The cycling of atmospheric aerosols through clouds can change their chemical and physical properties and thus modify how aerosols affect cloud microphysics and, subsequently, precipitation and climate. (uni-bielefeld.de)
- Here we simulate an atmospheric freeze-drying cycle of aerosols in laboratory experiments using proxies for atmospheric aerosols. (uni-bielefeld.de)
- Formation of highly porous aerosol particles by atmospheric freeze-drying in ice clouds", Proceedings of the National Academy of Sciences , vol. 110, 2013, pp. 20414-20419. (uni-bielefeld.de)
- The second series of experiments is the CLOud Processing of regional Air Pollution advecting over land and sea (CLOPAP) series, where ageing pollution aerosol from UK cities was observed, from an airborne platform, to interact with warm stratocumulus cloud in a cloud-capped atmospheric boundary layer. (manchester.ac.uk)
- Some devices for generating aerosols are: Aerosol spray Atomizer nozzle or nebulizer Electrospray Electronic cigarette Vibrating orifice aerosol generator (VOAG) Several types of atmospheric aerosol have a significant effect on Earth's climate: volcanic, desert dust, sea-salt, that originating from biogenic sources and human-made. (wikipedia.org)
- The science of climate and climate change involves study of the interaction between clouds, atmospheric radiation and aerosol particles. (lu.se)
Droplets10
- two air changes per hour) with no air spread by exposure to droplets and aerosols of respiratory fluids recirculation. (cdc.gov)
- Solid particles and liquid droplets in the air come in a range of sizes, but those smaller than 2.5 micrometers pose the greatest risk to human health. (nasa.gov)
- Current knowledge about aerosol processing by clouds is rather limited to chemical reactions within water droplets in warm low-altitude clouds. (uni-bielefeld.de)
- However, these aerosols act as Cloud Condensation Nuclei (CCN) and much of the organic material, along with the other species, is incorporated into cloud droplets. (manchester.ac.uk)
- An aerosol is a suspension of fine solid particles or liquid droplets in air or another gas. (wikipedia.org)
- Liquid droplets are almost always nearly spherical, but scientists use an equivalent diameter to characterize the properties of various shapes of solid particles, some very irregular. (wikipedia.org)
- Volcanic aerosol forms in the stratosphere after an eruption as droplets of sulfuric acid that can prevail for up to two years, and reflect sunlight, lowering temperature. (wikipedia.org)
- Primary biological aerosol particle (PBAPs) have a distinctive role because they initiate both cloud droplets and, at remarkably warm sub-zero temperatures, ice crystals. (lu.se)
- Examples are dust in your room air, cloud droplets, exhaust particles from an engine, sea-salt particles from wave foam as well as produced nanoparticles. (lu.se)
- These particles range from larger respiratory droplets to smaller aerosols which infect via inhalation or directly by contact with the eyes, nose, or mouth after touching infected surfaces. (who.int)
Clouds11
- For lidar observations of clouds and aerosols, multiple scattering plays an important role in the scattering process. (nasa.gov)
- Cases are considered that consist of a single cloud or aerosol layer, as well as a case in which cirrus clouds overlay different types of aerosols. (nasa.gov)
- Additionally, for the case of multiple but overlapping layers involving both clouds and aerosols, the depolarized lidar contains information that can help identify the particle properties of each layer. (nasa.gov)
- However, in cold high-altitude cirrus clouds and anvils of high convective clouds in the tropics and midlatitudes, humidified aerosols freeze to form ice, which upon exposure to subsaturation conditions with respect to ice can sublimate, leaving behind residual modified aerosols. (uni-bielefeld.de)
- Using a combination of satellite and radiosonde data, we show that highly porous aerosol formation can readily occur in highly convective clouds, which are widespread in the tropics and midlatitudes. (uni-bielefeld.de)
- Anthropogenic Aerosol Indirect Effects in Cirrus Clouds. (uni-bielefeld.de)
- In this paper, results are presented of the influence of small organic- and soot-containing particles on the formation of water and ice clouds. (manchester.ac.uk)
- Frederick G. Donnan presumably first used the term aerosol during World War I to describe an aero-solution, clouds of microscopic particles in air. (wikipedia.org)
- Human-made sulfate aerosols, primarily from burning oil and coal, affect the behavior of clouds. (wikipedia.org)
- Although all hydrometeors, solid and liquid, can be described as aerosols, a distinction is commonly made between such dispersions (i.e. clouds) containing activated drops and crystals, and aerosol particles. (wikipedia.org)
- FORCeS will identify key processes governing aerosol radiative forcing, as well as climate feedbacks related to aerosols and clouds, and improve the knowledge about these processes by bringing together leading European scientists. (forces-project.eu)
Derived cloud1
- 14 models have been evaluated with regard to their ability to reproduce the near-surface observed number concentration of aerosol particles and cloud condensation nuclei (CCN), as well as derived cloud droplet number concentration (CDNC). (knmi.nl)
Atmosphere7
- The environmental sources of microbial aerosols and processes by which they are emitted into the atmosphere are not well characterized. (nature.com)
- From these data, we estimate each fire aerosolized an average of 7 ± 4 × 10 9 cells and 2 ± 1 × 10 8 biological INPs per m 2 burned and conclude that emissions from wildland fire are sources of viable microbial aerosols to the atmosphere. (nature.com)
- The extent to which aerosol particles affect the climate depends on how much water the particles can hold in the atmosphere. (phys.org)
- In this lab session we will focus on submicron aerosol from two perspectives: measuring ultrafine particles in the atmosphere, and generating submicron calibration aerosol in the laboratory. (tsi.com)
- However, it was supposed that the major allergen Cry j 1 (Cry j 1 particles) could be released to the atmosphere as respirable-sized particles and modified by some air pollutants during airborne transportation. (witpress.com)
- The top image shows aerosol optical depth, a measure of the amount of light that the aerosols scatter and absorb in the atmosphere, and a proxy for how many particles are in the air. (nasa.gov)
- Still, all particles in the atmosphere affect its physics and chemistry and thereby also the climate forcing effects, which are very much in focus of the discussions today. (lu.se)
Measurements9
- When researchers recorded aerosol measurements prior to the administration of FEND, they found a classic "super spreading" distribution among the volunteers -- 20 percent of the volunteers were found to generate 80 percent of exhaled aerosols. (upi.com)
- TSI is inviting individuals interested in the aerosol and particle field to attend the 'Aerosol & Particle Measurements Short Course', set to take place from August 21-23 at the University of Minnesota, with hands-on laboratory experiences at both the TSI laboratory and the University of Minnesota laboratory. (tsi.com)
- If you're interested in entering or refreshing your knowledge of the aerosol and particle field, consider attending TSI's Aerosol & Particle Measurements Short Course. (tsi.com)
- In this lab session, we will make measurements of the size distribution and particle number concentration of aerosols that exhibit highly transient behavior such as those emitted by internal combustion engines. (tsi.com)
- Model results for the period 2011-2015 are compared with aerosol measurements (aerosol particle number, CCN and aerosol particle composition in the submicron fraction) from nine surface stations located in Europe and Japan. (knmi.nl)
- Measurements from depolarized lidars provide a promising method to retrieve both cloud and aerosol properties and a versatile complement to passive satellite-based sensors. (nasa.gov)
- This, barring special meteorology-aerosol connections, associates a doubling of aerosol optical depth with less than a doubling of CCN, contrary to previous studies based on heavily averaged measurements or a satellite algorithm. (nasa.gov)
- Researchers Sagnik Dey and Larry Di Girolamo of the University of Illinois at Urbana-Champaign assembled and analyzed nine years worth of measurements and found that the level of aerosol pollution was, depending on the season and location, two to five times higher than World Health Organization guidelines. (nasa.gov)
- The information about the particle concentration is, however, not directly obtained from lidar measurements, but extensive signal processing is necessary to evaluate the results. (lu.se)
Carbonaceous aerosols8
- Moreover, since Cry j 1 particles mainly consist of protein materials and cytoplasm from the pollens, they should be organic carbonaceous aerosols in fine particle sizes because protein materials are also some kind of organic carbon (OC). (witpress.com)
- At the same time, it is important to examine the release behavior of Cry j 1 particles and to evaluate the source contributions calculated from Cry j 1 particles to organic carbonaceous aerosols. (witpress.com)
- Development of an instrument for measuring light-absorbing carbonaceous aerosols in. (aerosol.si)
- Aerosol d.o.o., based in Ljubljana, Slovenia, develops and manufactures scientific instrumentation for monitoring carbonaceous aerosols in the air. (aerosol.si)
- More recently, we also started manufacturing instrumentation for monitoring other types of carbonaceous aerosols. (aerosol.si)
- It collaborates with many leading world scientists from the field of carbonaceous aerosols. (aerosol.si)
- Our instruments are used by scientific institutions, environmental monitoring agencies, industrial controllers, and many other applications to measure carbonaceous aerosols. (aerosol.si)
- For more than 13 years we develop and manufacture the most relied upon instruments for monitoring carbonaceous aerosols. (aerosol.si)
Organic11
- This PPE suggests that biogenic secondary organic aerosol formation and the hygroscopic properties of the organic material are likely to be the major sources of CCN uncertainty in summer, with dry deposition and cloud processing being dominant in winter. (knmi.nl)
- We have implemented and evaluated a secondary organic aerosol scheme within the chemistry transport model TM5-MP in this work. (lu.se)
- In earlier versions of TM5-MP the secondary organic aerosol (SOA) was emitted as Aitken-sized particle mass emulating the condensation. (lu.se)
- In the current scheme we simulate the formation of secondary organic aerosol from oxidation of isoprene and monoterpenes by ozone and hydroxyl radicals, which produce semi-volatile organic compounds (SVOCs) and extremely low-volatility compounds (EVOCs). (lu.se)
- The organic aerosol mass concentrations in the US show a much better seasonal cycle and no clear overestimation of mass concentrations anymore. (lu.se)
- We find that aerosols that contain organic material that undergo such a process can form highly porous aerosol particles with a larger diameter and a lower density than the initial homogeneous aerosol. (uni-bielefeld.de)
- A porous structure may explain the previously observed enhancement in ice nucleation efficiency of glassy organic particles. (uni-bielefeld.de)
- Combining the results it is shown that aged pollution aerosol consists of an internal mixture of organics, sulfate, nitrate and ammonium, the organic component is dominated by highly oxidized secondary material. (manchester.ac.uk)
- It is suggested that this sharp transition is caused by ice nucleation initiated by oxidised organic aerosol coated with sulfate in more polluted regions of cloud, sometimes enhanced by secondary ice particle production in these regions. (manchester.ac.uk)
- Secondary organic aerosol (SOA) is formed through the oxidation of volatile organic compounds (VOC), which can be of both natural and anthropogenic origin. (copernicus.org)
- Fluctuations in the CRH, which can be induced by other constituents in sulfate particles such as minerals or organic molecules, strongly affect the solids mass fraction in the boundary layer but not at higher altitudes. (nasa.gov)
Single-particle1
- Single particle soot photometers (SP2) use laser-induced incandescence to detect aerosols on a single particle basis. (environmental-expert.com)
20233
- Malaga, Spain - Particles Plus®, a leading provider of advanced particle counters and air quality monitoring instrumentation, is proud to announce its Silver Sponsorship of the European Aerosol Conference (EAC) 2023. (particlesplus.com)
- At the EAC 2023, Particles Plus will showcase the Condensation Particle Counter (CPC) 12000 Series, an instrument set to revolutionize ultrafine particle research. (particlesplus.com)
- Tokyo, Japan - September 8th, 2023 - Particles Plus® instruments have once again been used by scientists for research into Nebulizer Inhalation Therapy. (particlesplus.com)
Anthropogenic5
- The lower map shows the likely source-natural or human-made (anthropogenic)-based on the size of the particles and other factors. (nasa.gov)
- Aerosols can be natural or anthropogenic. (wikipedia.org)
- Examples of anthropogenic aerosols include particulate air pollutants, mist from the discharge at hydroelectric dams, irrigation mist, perfume from atomizers, smoke, dust, steam from a kettle, sprayed pesticides, and medical treatments for respiratory illnesses. (wikipedia.org)
- When a person inhales the contents of a vape pen or e-cigarette, they are inhaling an anthropogenic aerosol. (wikipedia.org)
- Hazardous anthropogenic aerosol particles constitute a major pollution component and cause a direct risk factor. (lu.se)
Natural aerosols1
- Examples of natural aerosols are fog or mist, dust, forest exudates, and geyser steam. (wikipedia.org)
Soot particle2
- A novel methodology was introduced to investigate differences in soot maturity using a soot particle aerosol mass spectrometer (SP AMS). (lu.se)
- This hypothesis can form a basis for future evaluations of drivers of soot particle toxicity that are of relevance for global air pollution problems. (lu.se)
Scatter2
- logCCN / ∂logσ is less than unity because, among other explanations, growth processes generally make aerosols scatter more light without increasing their number. (nasa.gov)
- We find that highly porous aerosol particles scatter solar light less efficiently than nonporous aerosol particles. (uni-bielefeld.de)
Sulfate5
- Global distribution of solid and aqueous sulfate aerosols: Effect of the. (nasa.gov)
- The partitioning between solid and aqueous phases of tropospheric sulfate-ammonium particles is simulated with a global 3-D chemical transport model (CTM). (nasa.gov)
- The simulation explicitly accounts for the hysteresis of particle phase transitions by transporting aqueous sulfate and three solid sulfate forms (namely, ammonium sulfate, letovicite, and ammonium bisulfate). (nasa.gov)
- R esults indicate that SO 2 oxidation by NO 2 in aerosol particles may be an important source of sulfate aerosol under polluted haze conditions. (nju.edu.cn)
- SO 2 oxidation by NO 2 in aerosol particles has been previously proposed to drive sulfate formation during haze events, but the aerosol pH values are required to be ~ 6 or higher for this chemistry to be environmentally important when literature values for the kinetics are used. (nju.edu.cn)
Ultrafine particles1
- This breakthrough technology will enable researchers to explore new frontiers in aerosol science, including the study of ultrafine particles and their effects on climate change, air quality, and human health. (particlesplus.com)
Nanoparticles3
- Aerosol technology provides efficient methods for producing nanoparticles with well-controlled composition and size distribution. (lu.se)
- Nanoparticles or nanomaterials are increasingly important due to their unique physical and chemical properties, such as particle size, zeta potential, and molecular weight. (news-medical.net)
- The physicists have developed a method of manufacturing metal nanoparticles using aerosol technology, and one possibility would be to mix these metal nanoparticles into a liquid that is then used to print, he explains. (lu.se)
Biogenic1
- The Nitrate Aerosol and Volatility Experiment (NArVE) aimed to study the NO 3 -induced SOA formation and evolution from three biogenic VOCs (BVOC), namely isoprene, α-pinene and β-caryophyllene. (copernicus.org)
Secondary2
- The dust particles can be released directly as primary or formed through gas-to-particle conversion as secondary emissions in air. (aaqr.org)
- secondary aerosols form through gas-to-particle conversion. (wikipedia.org)
Researchers11
- Sept. 29 (UPI) -- Researchers have developed a new nasal cleansing spray, featuring calcium-rich salts, that can kill sub-micron aerosolized particles, according to a study published Tuesday in the Molecular Frontiers Journal . (upi.com)
- To test the effectiveness of FEND, researchers at Harvard and MIT measured the number of exhaled aerosols of 76 volunteers who did not have COVID-19 before and after using the nasal saline. (upi.com)
- According to researchers, many of these aerosols were the sub-micron aerosolized particles that aren't effectively filtered by most daily-use masks. (upi.com)
- Among the super-spreaders, researchers found half were responsible for 80 percent of super-spreader aerosol production, or 64 percent of overall aerosol production -- super super-spreaders. (upi.com)
- Tests showed FEND's aerosol suppression effects lasted several hours after administration, researchers reported. (upi.com)
- When researchers excluded one outlier individual, they found exhaled aerosols were reduced by 59 percent by masks and 87 percent by FEND usage. (upi.com)
- Among the signatories are also many aerosol researchers from TROPOS. (tropos.de)
- The EAC is a premier annual gathering for scientists, researchers, and industry professionals who are at the forefront of aerosol science and technology. (particlesplus.com)
- With a focus on continuous innovation, Particles Plus delivers precision-engineered solutions that meet the most stringent standards, helping researchers, industries, and governments around the world to monitor and control indoor and outdoor air quality. (particlesplus.com)
- Researchers evaluated the impact of age, body mass index, and gender on aerosol particles. (news-medical.net)
- A newly developed sample delivery system at MAX IV lets researchers study the properties of aerosol particles. (lu.se)
Overall aerosol1
- Two participant simulators (participant receivers) cleaners in classrooms could reduce overall aerosol particle con- similar in design to the respiratory aerosol source simulator centrations by 80% within 30 minutes ( 3 , 4 ). (cdc.gov)
Pollution2
Climate3
- models may be predisposed to be too "aerosol sensitive" or "aerosol insensitive" in aerosol-cloud-climate interaction studies, even if they may capture average droplet numbers well. (knmi.nl)
- Aerosol particles are used within nanotechnology (for instance solar cells), in health care (for instance the Turbuhaler®), but also have adverse health effects during deposition in our lungs and affect climate through the reflection and absorption of solar light and through cloud formation. (lu.se)
- This thesis focuses on how volcanic aerosol particles influence the climate by scattering solar radiation and altering cloud properties. (lu.se)
Observations8
- An additional model has been used to investigate potential causes of model diversity in CCN and bias compared to the observations by performing a perturbed parameter ensemble (PPE) accounting for uncertainties in 26 aerosol-related model input parameters. (knmi.nl)
- Models capture the relative amplitude of the seasonal variability of the aerosol particle number concentration for all studied particle sizes with available observations (dry diameters larger than 50, 80 and 120 nm). (knmi.nl)
- In contrast to the large spread in simulated aerosol particle and CCN number concentrations, the CDNC derived from simulated CCN spectra is less diverse and in better agreement with CDNC estimates consistently derived from the observations (average NMB −13 % and −22 % for updraft velocities 0.3 and 0.6 m s−1, respectively). (knmi.nl)
- For more detailed analysis, the particle mass and number concentrations and their influence on the simulated aerosol optical depth are compared to observations. (lu.se)
- However, the modelled concentrations of formed particles are clearly lower than in observations, as is the subsequent growth to larger sizes. (lu.se)
- For a variety of airborne and ground-based observations not dominated by dust, regression identifies the CCN (cm−3 ) at 0.4 ± 0.1 % supersaturation with 100.3α+1.3 σ 0.75 where σ (Mm−1 ) is the 500 nm extinction coefficient by dried particles and α is the Angstrom exponent. (nasa.gov)
- These observations may have implications for subsequent cloud formation cycles and aerosol albedo near cloud edges. (uni-bielefeld.de)
- Observations and modeling of aerosol and cloud properties. (copernicus.org)
Airborne3
- AQ Guard , currently the most advanced compact analyzer for determining indoor air quality, continuously and reliably analyses airborne fine dust particles in the range 0.175 - 20 µm. (environmental-expert.com)
- Participants will gain a deeper understanding of the fundamentals of aerosol properties and behavior, and will also receive practical skill training to sample, measure, and characterize airborne particulate matter in various applications. (tsi.com)
- The aim of this study is to examine the particle size distribution of Cry j 1 and OC in airborne aerosols to clarify some mechanisms provoking pollen asthma and to evaluate source contributions during a severe pollination episode of FY 2005. (witpress.com)
Emissions3
- Here, we measured outward emissions of micron-scale aerosol particles by healthy humans performing various expiratory activities while wearing different types of medical-grade or homemade masks. (nih.gov)
- Aerosols are tiny solid and liquid particles suspended in the air, and they come from many natural sources, including volcano emissions, sand and dust storms, and salt from sea spray. (nasa.gov)
- The new methodology and interpretation can improve methods that use aerosol mass spectrometry for the source apportionment of combustion emissions. (lu.se)
Concentrations2
- The short-term persistence time (on the order of a few days) of CCN concentrations, which is a measure of aerosol dynamic behavior in the models, is underestimated on average by the models by 40 % during winter and 20 % in summer. (knmi.nl)
- Overall, we find that while CCN is controlled by both aerosol particle number and composition, CDNC is sensitive to CCN at low and moderate CCN concentrations and to the updraft velocity when CCN levels are high. (knmi.nl)
Generate4
- Further work is needed to establish the efficacy of cloth masks at blocking expiratory particles for speech and coughing at varied intensity and to assess whether virus-contaminated fabrics can generate aerosolized fomites, but the results strongly corroborate the efficacy of medical-grade masks and highlight the importance of regular washing of homemade masks. (nih.gov)
- This lab will demonstrate two instruments that can generate aerosols larger than a micron, as well as several instruments appropriate for sizing such aerosols. (tsi.com)
- Combustion can also generate brown carbon (BrC) particles, with absorption confined to shorter wavelengths than BC and absorption Ångström exponents (AAEs) significantly higher than 1. (lu.se)
- She works on setting up flames that will generate soot particles which are led through a pipe into the experiment chamber and investigated using the X-ray beam from MAX IV. (lu.se)
Oxidation3
- On Sep 30, 2021, Nature Chemistry published a paper titled "Oxidation of sulfur dioxide by nitrogen dioxide accelerated at the interface of deliquesced aerosol particles" by associate Professor Tengyu Liu. (nju.edu.cn)
- T he authors study the oxidation of SO 2 by NO 2 in atmospherically relevant NH 3 -buffered deliquesced aerosol particles in an environmental chamber. (nju.edu.cn)
- Soot formation and oxidation processes were studied by extracting particles from the cylinder of a heavy-duty diesel engine. (lu.se)
Black Carbon1
- S ince 2007 w e manufacture Aethalometer®, the most widely used instrument for monitoring black carbon aerosols in the air. (aerosol.si)
Size10
- We investigated the in vitro influence of breathing patterns on lung dose (LD) and particle size distribution in an infant upper airway cast model in order to determine the optimal particle size for nebulized aerosol delivery to infants. (nih.gov)
- Particles available as LD for all simulated breathing pattern showed a particle size distribution with a MMAD of 2.4 microm and a geometric standard deviation (GSD) of 1.56. (nih.gov)
- In filter testing there are quite a few choices to make: aerosol composition, aerosol size, detector design, flow rate, etc. (tsi.com)
- Title : Influenza Virus Aerosols in Human Exhaled Breath: Particle Size, Culturability, and Effect of Surgical Masks Personal Author(s) : Milton, Donald K.;Fabian, M. Patricia;Cowling, Benjamin J.;Grantham, Michael L.;McDevitt, James J. (cdc.gov)
- New research released this fall shows that the amount, size, and source of the aerosol particles hovering in the air over India changes by season. (nasa.gov)
- Meteorologists usually refer them as particle matter - PM2.5 or PM10, depending on their size. (wikipedia.org)
- Particle size has a major influence on particle properties, and the aerosol particle radius or diameter (dp) is a key property used to characterise aerosols. (wikipedia.org)
- A monodisperse aerosol, producible in the laboratory, contains particles of uniform size. (wikipedia.org)
- The soot particles were characterized for their optical properties, chemical composition, size, and carbon nanostructure (soot maturity). (lu.se)
- Aerosol particles are everywhere, in size from 1 nanometer up to some tenths of a mm. (lu.se)
Spherical6
- Non-spherical (dust) aerosol models, which were introduced in version 16 of the MISR aerosol product, improved the quality and coverage of retrievals in dusty regions. (copernicus.org)
- Due to the sensitivity of the retrieval to the presence of non-spherical aerosols, the MISR aerosol product has been successfully used to track the location and evolution of mineral dust plumes from the Sahara across the Atlantic, for example. (copernicus.org)
- However, the MISR global non-spherical aerosol optical depth (AOD) fraction product has been found to have several climatological artifacts superimposed on valid detections of mineral dust, including high non-spherical fraction in the Southern Ocean and seasonally variable bands of high non-sphericity. (copernicus.org)
- In this paper we introduce a formal approach to examine the ability of the operational MISR Dark Water algorithm to distinguish among various spherical and non-spherical particles as a function of the variable MISR viewing geometry. (copernicus.org)
- The equivalent diameter is the diameter of a spherical particle with the same value of some physical property as the irregular particle. (wikipedia.org)
- Aerosol particles are not necessarily spherical, but can have a complex shape, surface structure and morphology (see image below). (lu.se)
Chemistry1
- In the AAF working committee experts in the field of Chemistry, Aerosol Physics and Engineering Sciences deal with questions on the origin, the spreading, the composition, and the impact of particulate matter in the environment. (dechema.de)
Concentration of particles2
- The model diversity (defined as the ratio of standard deviation to mean) is up to about 3 for simulated N3 (number concentration of particles with dry diameters larger than 3 nm) and up to about 1 for simulated CCN in the extra-polar regions. (knmi.nl)
- This study investigated effectiveness of negative ionic air purifier in lowering the concentration of particles in a closed test chamber. (aaqr.org)
Diameters1
- The liquid or solid particles in an aerosol have diameters typically less than 1 μm (larger particles with a significant settling speed make the mixture a suspension, but the distinction is not clear-cut). (wikipedia.org)
Exposure4
- Three groups of AGMs (4 in each group) were exposed to 3 different target doses of MERS-CoV EMC/2012 strain by small particle aerosol exposure. (cdc.gov)
- The speaker simulator the effectiveness of portable HEPA air cleaners and universal (speaker receiver) was a commercial simulator (Warwick masking at reducing exposure to exhaled aerosol particles, the Technologies Ltd.) that breathed at 28 L/min. (cdc.gov)
- These findings suggest that portable HEPA to determine the exposure of each receiver simulator to aero- air cleaners can reduce exposure to SARS-CoV-2 aerosols in sol particles. (cdc.gov)
- When the simulators were masked, the particle indoor environments, with greater reductions in exposure counters collected aerosol samples from inside the masks (i.e., occurring when used in combination with universal masking. (cdc.gov)
Measurement4
- The course is designed to provide basic aerosol measurement and sampling skills to individuals entering the aerosol and particle field, as well as updated information for those already in the field. (tsi.com)
- Browse the complete course information on the Aerosol and Particle Measurement Short Course website . (tsi.com)
- Particles Plus technology pushes the boundaries of what's possible in particle detection and measurement, enabling scientists to delve deeper into their research with affordable technology. (particlesplus.com)
- In the figure below, the part of the extinction coefficient that originates from aerosol particles is shown as a function of height and time for one measurement performed in a rural part of Sweden and one in an urban part of China. (lu.se)
Cloud properties1
- The cloud properties are controlled by the aerosol conditions of the environment. (lu.se)
Particulate matter1
- The term aerosol commonly refers to the particulate/air mixture, as opposed to the particulate matter alone. (wikipedia.org)
Mixture1
- An aerosol is a mixture of air with solid or liquid particles. (tropos.de)
Extinction4
- We examine the relationship between the number concentration of boundary-layer cloud condensation nuclei (CCN) and light extinction to investigate underlying aerosol processes and satellite-based CCN estimates. (nasa.gov)
- What is generally shown when the aerosol particle concentration is measured with lidar is the extinction coefficient as a function of height. (lu.se)
- The extinction coefficient is highly dependent on the amount of particles and is therefore a powerful measure of that. (lu.se)
- The very dark area (high extinction) close to ground indicates alot of particles at the urban site. (lu.se)
Sensitivity4
- A compact Raman spectroscopy system with high sensitivity to chemical aerosols has been developed. (mit.edu)
- Monte Carlo simulations are carried out to investigate the sensitivity of lidar backscattering depolarization to cloud and aerosol properties. (nasa.gov)
- However, our results show little sensitivity to ice or aerosol particle sizes. (nasa.gov)
- The aim of this study is to theoretically investigate the sensitivity of the Multi-angle Imaging SpectroRadiometer (MISR) operational (version 22) Dark Water retrieval algorithm to aerosol non-sphericity over the global oceans under actual observing conditions, accounting for current algorithm assumptions. (copernicus.org)
Solid particles1
- During the production, the conveyance and the filling of solid particles in the form of powders, bulk materials, granulates, pellets and many other shapes, dust is generated as a rule. (environmental-expert.com)
Physics2
- This review provides an overview of methods and results obtained by using aerosol technology for producing nanostructures for a variety of applications in semiconductor physics and device technology. (lu.se)
- Dr Kim Cuong Le from the Division of Combustion Physics at Lund University is conducting one of the first experiments using the new Aerosol Sample Delivery System. (lu.se)
Investigated the concentration1
- This study investigated the concentration gradient of particles at various heights and distances from the source of negative ions. (aaqr.org)
Lidar2
- It is demonstrated that besides thermodynamic cloud phase, the depolarized lidar signal may provide additional information on ice or aerosol particle shapes. (nasa.gov)
- The lidar technique has over many years developed to become an important method to measure the aerosol particle concentration with the help of the backscattered light. (lu.se)
Sulfates1
- The rest of the aerosol load in the air comes from man: sulfates, black and brown carbon, and other pollutants associated with the burning of fossil fuels and of agricultural land. (nasa.gov)
Detection1
- Its ultra-bright, ultra-sensitive particles allow for excellent detection. (splitter.com)
Study3
- The findings, which build on an earlier study this summer, suggest that we can provide what is, in effect, a nasal filter to protect at-risk populations from viral carrying aerosols," lead study author David Edwards , lead study author and founder Sensory Cloud. (upi.com)
- In this study we analyzed microbial cells and biological ice nucleating particles (INPs) in smoke emitted from eight prescribed wildland fires in North Florida. (nature.com)
- Study schedule for small particle aerosol infection of African green monkeys (AGMs) with MERS-CoV. (cdc.gov)
Mass concentration1
Experiments1
- The first is the CLoud-Aerosol Characterisation Experiment (CLACE) series of experiments performed at a high Alpine site (Jungfraujoch), where cloud was in contact with the ground and the measuring station. (manchester.ac.uk)
Lund University1
- Dr Kim Cuong Le from Lund University is adjusting the soot aerosol generator at beamline FinEstBeAMS. (lu.se)
Formation6
- A global mean reduction of a factor of about 2 is found in the model diversity for CCN at a supersaturation of 0.2 % (CCN0.2) compared to that for N3, maximizing over regions where new particle formation is important. (knmi.nl)
- Furthermore, we have introduced a new particle formation mechanism depending on the concentration of ELVOCs. (lu.se)
- Phenomenologically, the new particle formation scheme implemented here is able to reproduce the occurrence of observed particle formation events. (lu.se)
- Although the process-based approach to SOA formation causes a reduction in model performance in some areas, overall the new scheme improves the simulated aerosol fields. (lu.se)
- Desert dust, mineral particles blown to high altitudes, absorb heat and may be responsible for inhibiting storm cloud formation. (wikipedia.org)
- The formation of reactive oxygen species (ROS) is an important mechanism in particle-induced toxicity. (lu.se)
Variability1
- The evaluation focuses on the ability of models to simulate the average across time state in diverse environments and on the seasonal and short-term variability in the aerosol properties. (knmi.nl)