• We use the method of inversion with regularization with constraints, which has evolved into the standard method for the retrieval of microphysical parameters of tropospheric particles from multiwavelength lidar observations. (herts.ac.uk)
  • Since the major target of these instruments is the aerosol particles in the atmospheric boundary layer, the elevation angles of these lidars are set to be small (4˚ for PPI and 30˚ for SP). (scirp.org)
  • The ability of aerosol particles to act as ice nucleating particles (INPs) depends on meteorological factors such as temperature and ice supersaturation (as a function of vertical velocity), as well as on the aerosol type in the layer in which cirrus developed (Kanji et al. (copernicus.org)
  • The model is based on the MIMOSA model (Modélisation Isentrope du transport Méso-échelle de l'Ozone Stratosphérique par Advection) and adds several modules: a fully explicit size-resolving microphysical scheme to transport aerosol granulometry as passive tracers and an optical module, able to calculate the scattering and extinction properties of particles at given wavelengths. (hal.science)
  • These aerosol particles can not only be distributed in the troposphere, but can even reach the stratosphere above and influence the Earth's radiation budget and cloud cover over long periods and large areas. (leibniz-gemeinschaft.de)
  • 3+2 + X: what is the most useful depolarization input for retrieving microphysical properties of non-spherical particles from lidar measurements using the spheroid model of Dubovik et al. (herts.ac.uk)
  • This set of data is sufficient for retrieving some important microphysical particle parameters if the particles have spherical shape. (herts.ac.uk)
  • However, additional measurements at wavelengths different from 355 nm would be desirable for application to a wider range of aerosol scenarios that may include non-spherical smoke particles, which can have values of δ355 that are indistinguishable from those found for mineral dust. (herts.ac.uk)
  • Dr. Rocha-Lima's research includes the study of the microphysical, optical properties and composition of atmospheric particles, their fundamental interaction with light, and their effects in the atmosphere. (umbc.edu)
  • Her primary research focuses on laboratory and in situ measurements of the properties of atmospheric particles, satellite data analysis, and evaluation of atmospheric models. (umbc.edu)
  • One of the goals is to obtain an update and accurate database of optical properties of atmospheric particles to improve remote sensing and modelling. (umbc.edu)
  • The fractal dimension (D$_{f}$), a morphologic parameter to represent the branching degree of particles, for soot particles in the RES (1.82 ± 0.12) is lower than that in the INT (2.11 ± 0.09), which indicates that in-cloud processes may result in less compact soot. (kit.edu)
  • This research emphasizes the role of in-cloud processes in the chemistry and microphysical properties of individual particles. (kit.edu)
  • Ice nucleates in various ways from aerosol particles, termed ice-nucleating particles, over an extensive temperature and humidity range. (nature.com)
  • Water in nanometre-sized confinements at the surface of aerosol particles can serve as the origin of ice formation. (nature.com)
  • Aerosols, the small particles of various origins present in the atmosphere, can influence the microphysical and macro-physical properties of clouds and hence impact the energy balance, precipitation and the hydrological cycle (indirect aerosol effects). (inoe.ro)
  • 2000) ascertain aerosol features from extensively measured solar transmission and sky radiation (in AERONET), but results of such passive measurements are averaged over the entire atmospheric column and cannot provide information regarding the vertical distribution of particles. (inoe.ro)
  • The main purpose of these techniques is the retrieval of height distributions of optical and microphysical properties of fine-mode and coarse-mode particles (Wagner J et al. (inoe.ro)
  • KARL provides highly resolved profiles of the scattering characteristics of aerosol and cloud particles (backscattering, extinction and depolarization) as well as water vapor profiles within the lower troposphere. (uni-potsdam.de)
  • The Aerosol, Clouds and Trace Gases Research Infrastructure (ACTRIS) is the pan-European research infrastructure producing high-quality data and information on short-lived atmospheric constituents and on the processes leading to the variability of these constituents in natural and controlled atmospheres. (psi.ch)
  • The Aerosols, Clouds and Trace gases Research Infrastructure (ACTRIS) is a distributed infrastructure dedicated to high-quality observation of aerosols, clouds, trace gases and exploration of their interactions. (psi.ch)
  • It will deliver precision data, services and procedures regarding the 4D variability of clouds, short-lived atmospheric species and the physical, optical and chemical properties of aerosols to improve the current capacity to analyse, understand and predict past, current and future evolution of the atmospheric environment. (psi.ch)
  • Permanent and long-term observations of aerosols, clouds and trace gases at distributed National Facilities are performed by ACTRIS ERIC member countries. (psi.ch)
  • By 1969, "over 20 lasers were in use by meteorologists in the United States on at least a semi-routine basis" for various applications including aerosol measurements, sub-visible cirrus and noctilucent clouds observations, and visibility measurement A simplified representation of a lidar set-up is demonstrated in Figure 1. (wikipedia.org)
  • Part of the transmitted radiation is scattered by atmospheric components (i.e., gases, molecules, aerosols, clouds) backward to the lidar, where it is collected by a telescope. (wikipedia.org)
  • Level-2 products will provide geophysical and microphysical parameters for aerosols and clouds. (eumetsat.int)
  • The overarching goal of MC4 is to describe better and quantify interactions among monsoon dynamics, clouds, aerosols, precipitation and water cycle in a changing climate. (moes.gov.in)
  • Conducted airborne observations of seeded and unseeded clouds with their microphysical changes. (moes.gov.in)
  • We present a high-resolution isentropic microphysical transport model dedicated to stratospheric aerosols and clouds. (hal.science)
  • Clouds as a major component of meteorology and climate, cannot be studied independently from boundary layer processes, atmospheric dynamics, including radiative, microphysical, thermodynamical, dynamical and turbulent processes. (actris.eu)
  • The smoke causing more clouds, could open a new impact-pathway in the context of climate change, since clouds can have a cooling or warming effect, depending on their optical thickness, phase, and microphysical properties. (leibniz-gemeinschaft.de)
  • Atmospheric ice nucleation is crucial for global precipitation and affects the structure, lifetime and reflectivity of clouds, thereby impacting climate. (nature.com)
  • Dr. Posselt is currently a member of the science teams for the Cyclone Global Navigation Satellite System (CYGNSS), Aerosols Clouds Ecosystems (ACE), and CloudSat missions. (nasa.gov)
  • In particular lidars (optical active remote sensing instruments) are used to characterize aerosols and clouds. (inoe.ro)
  • Clouds and Atmospheric. (nasa.gov)
  • By using an advanced two-moment microphysical parameterization, aerosol effects on clouds and precipitation are modeled by taking into account aerosol assumptions for cloud condensation nuclei (CCN). (wavestoweather.de)
  • Hi everyone, I am trying to increase water friendly aerosol number concentration over the Great Barrier Reef to test the sensitivity of clouds to aerosol loading. (ucar.edu)
  • Clouds and aerosols as parts of the Arctic atmosphere play an important role in the radiation budget, which is, as yet, poorly quantified and understood. (uni-potsdam.de)
  • Because ice and liquid phase clouds have very different scattering and absorbing properties, an incorrect cloud phase decision can lead to substantial errors in the cloud optical and microphysical property products such as cloud optical thickness or effective particle radius. (bvsalud.org)
  • For MODIS Collection 6 (C6), the shortwave-derived cloud thermodynamic phase algorithm used by the optical and microphysical property retrievals has been completely rewritten to improve the phase discrimination skill for a variety of cloudy scenes (e.g., thin/thick clouds, over ocean/land/desert/snow/ice surface, etc). (bvsalud.org)
  • The purpose of these observations is to retrieve the aerosol extinction coefficient (AEC) and aerosol optical thickness (AOT) simultaneously at the overpass time of Landsat-8 satellite. (scirp.org)
  • The algorithm is designed for the enhanced characterisation of aerosol properties from spectral, multi-angular polarimetric remote sensing observations. (eumetsat.int)
  • To estimate smoke particle properties, such as number, surface area and volume concentration, the conversion factors, which link the fluorescence backscattering and the smoke microphysical properties, are derived from the synergy of multiwavelength Mie-Raman and fluorescence lidar observations. (copernicus.org)
  • New observations and related modelling studies of the aerosol-cloud-climate. (copernicus.org)
  • Identification of topographic features influencing aerosol observations at high altitude stations. (utah.edu)
  • Large Contribution of Coarse Mode to Aerosol Microphysical and Optical Properties: Evidence from Ground-based Observations of a Trans-Pacific Asian Dust Outbreak at a High-Elevation North American Site. (utah.edu)
  • For that, Dr. Rocha-Lima combines long term satellite observations of atmospheric components and key meteorological parameters with global simulations using the NASA Goddard Earth Observation System (GEOS) model in collaboration with scientists from the Laboratory of Atmospheric Chemistry and Dynamics at NASA Goddard Space Flight Center. (umbc.edu)
  • This paper describes a dataset of CO 2 emissions and removals derived from atmospheric CO 2 observations. (copernicus.org)
  • Observations are fundamental to improve atmospheric models by advancing process understanding, evaluating model performance, and improving initial conditions via data assimilation. (inoe.ro)
  • Here, we demonstrate how observations of carbon monoxide and aerosol optical depth retrieved from polar orbiting and geostationary meteorological satellites can be used to study the long-range transport and evolution of smoke plumes. (bvsalud.org)
  • Analyses from the Copernicus Atmosphere Monitoring Service, which combine satellite observations with an atmospheric model, are used for comparison across the region of study and along simulated air parcel trajectories. (bvsalud.org)
  • This study focuses on optimising the GRASP algorithm for 3MI L2 aerosol retrieval. (eumetsat.int)
  • The aerosol retrieval for the 3MI operational product will use the GRASP algorithm. (eumetsat.int)
  • The retrieval provides extended set of aerosol and reflectance surface parameters. (eumetsat.int)
  • GRASP (Generalized Retrieval of Aerosol and Surface Properties) is a highly accurate aerosol retrieval algorithm that processes properties of aerosol and land surface reflectance. (eumetsat.int)
  • GRASP has demonstrated a strong reliability for aerosol retrieval and characterisation on the PARASOL mission. (eumetsat.int)
  • "A Laboratory Experiment for the Statistical Evaluation of Aerosol Retrieval (STEAR) Algorithms" , Remote Sens. (umbc.edu)
  • The C6 algorithm changes collectively can result in significant changes relative to C5, though the magnitude depends on the dataset and the pixel's retrieval location in the cloud parameter space. (bvsalud.org)
  • Atmospheric Chemistry and Physics. (utah.edu)
  • Dr. Posselt is a research scientist with the Atmospheric Physics and Weather group (329E) in the Earth Science Section at NASA Jet Propulsion Laboratory (JPL), California Institute of Technology (Caltech). (nasa.gov)
  • Hi all, I am trying to run the aerosol-aware version with mp_physics = 28 option under WRF V4.4. (ucar.edu)
  • In ACTRIS, the National Facilities are comprised of i) Observational Platforms, which cover the classical measurements of atmospheric air pollutants and cloud properties at rural and background sites and of ii) Exploratory Platforms, which are additional facilities for answering more science-based questions, such as atmospheric simulation chambers and mobile installations. (psi.ch)
  • Measurements from networks of ground sites, a research ship, tall towers, balloon-borne ozonesondes, multiple aircraft, and satellites provided in situ and remotely sensed data on trace pollutant and greenhouse gas concentrations, aerosol chemical composition and microphysical properties, cloud microphysics, and meteorological parameters. (nasa.gov)
  • The new facility will open new avenues for chemical profiling of aerosol pollution from measurements of Raman scattering by selected chemical compounds, provide data that allow to close the gap between optical and microphysical aerosol profiling with lidar and enables connecting lidar measurements to parameters used in atmospheric modelling. (herts.ac.uk)
  • The receiver combines a spectrometer with a 32-channel detector or an ICCD camera to resolve Raman signals of various chemical compounds.The new facility will open new avenues for chemical profiling of aerosol pollution from measurements of Raman scattering by selected chemical compounds, provide data that allow to close the gap between optical and microphysical aerosol profiling with lidar and enables connecting lidar measurements to parameters used in atmospheric modelling. (herts.ac.uk)
  • Conduct ground-based measurements of greenhouse gas (GHG) concentrations and fluxes, chemical trace gases and meteorological parameters. (moes.gov.in)
  • In this article, we provide results of fluorescence and multiwavelength Mie-Raman lidar measurements performed at ATOLL (ATmospheric Observation at liLLe) observatory from Laboratoire d'Optique Atmosphérique, University of Lille, during strong smoke episodes in the summer and autumn seasons of 2020. (copernicus.org)
  • Common algorithms to be applied to all network measurements are also a must to generate network-wide consistent geophysical parameters. (actris.eu)
  • The overarching theme of Dr. Hallar's research is using high quality measurements of trace gases, aerosol physical and chemical properties, and cloud microphysics to understand connections between the biosphere, atmosphere, and climate, along with the impact of anthropogenic emissions on these connections. (utah.edu)
  • One sub-project of CleanCloud is dedicated to the statistical assessment of aerosol-cloudinteraction processes based on long-term active and passive ground-based remote-sensing measurements (e.g., aerosol & Doppler lidar, cloud radar). (iista.es)
  • The LIDAR (Light Detection And Ranging) measurements presented in this PhD thesis contribute with continuous altitude resolved aerosol profiles to the understanding of occurrence and characteristics of aerosol layers above Ny-Ålesund, Spitsbergen. (uni-potsdam.de)
  • Measurements on 4 April 2009 revealed maximum AOD values of up to 0.12 and aerosol size distributions changing with altitude. (uni-potsdam.de)
  • In the present study, the impact of local meteorological parameters such as wind, temperature, rainfall and Atmospheric Boundary Layer Height on BC mass concentration is investigated. (aaqr.org)
  • The two spring periods March and April 2007 and 2009 were at first analyzed based on meteorological parameters, like local temperature and relative humidity profiles as well as large scale pressure patterns and air mass origin regions. (uni-potsdam.de)
  • The propagation of pulsed laser radiation along the atmospheric ground paths containing droplet aerosols (fog, drizzle, rain) belongs to a class of problems in nonlinear optics in which the multiple-factor nature and nonadditivity of the processes affecting the transmission of the radiation channel are strongly pronounced. (spie.org)
  • The interaction of the radiation with the medium along the propagation path strongly depends on the type and microphysical properties of the specific meteorological formation as well as on the energy parameters of the beam, the structure of the beam, the temporal regime, and the conditions of focusing. (spie.org)
  • My research works involve in investigations on optical and physical properties of aerosols, and their impact on perturbation in Earth's radiation budget and alteration in cloud formation and thereby, changes in precipitation. (jcbose.ac.in)
  • Fog is one such example of extreme weathers, which makes significant changes such characteristics of aerosol that thereby, effects not only radiation budget and cloud formation, but also impact strongly on human health due to drastically deteriorating breathing air quality. (jcbose.ac.in)
  • The aerosol fluorescence was induced by 355 nm laser radiation, and the fluorescence backscattering was measured in a single spectral channel, centered at 466 nm and having 44 nm width. (copernicus.org)
  • The GOME-2 products (ozone, trace gases, aerosols and UV radiation) are important for ozone chemistry, air quality studies, climate modeling, policy monitoring and hazard warnings. (copernicus.org)
  • The more intense and more frequent wildfires are potentially affecting atmospheric radiation budget at a still unknown extent. (leibniz-gemeinschaft.de)
  • This work is important to understand how particulate matter present in the Earth's atmosphere interacts with solar radiation, their effects as atmospheric constituents, and their implications for air pollution, human health, and climate. (umbc.edu)
  • In the case of aerosol-radiation interaction (ARI), the perturbation in atmospheric parameters can be computed by taking the. (ucar.edu)
  • The Koldewey Aerosol Raman LIDAR (KARL) is an instrument for the active remote sensing of atmospheric parameters using pulsed laser radiation. (uni-potsdam.de)
  • The PPI lidar, operated at 349 nm, provides nearly horizontal distribution of AEC in the lower part of the atmospheric boundary layer. (scirp.org)
  • Therefore, in the present paper, a novel monitoring technique is proposed and demonstrated for retrieving nearly horizontal distribution of aerosol in the atmospheric boundary layer by combining the data from a plan-position indicator (PPI) lidar and visible images of Operational Land Imager (OLI) onboard Landsat-8 satellite. (scirp.org)
  • In contrast to uncoupled stand-alone models, coupled Earth system models can modify mean near-surface air temperatures locally by up to several degrees compared with their stand-alone atmospheric counterparts using prescribed surface boundary conditions. (lu.se)
  • Maximum BC concentrations are observed in the post-monsoon and winter seasons due to the stubble-burning activity and lower values of Atmospheric Boundary Layer Height (ABLH). (aaqr.org)
  • Surface heterogeneities ranging from large scales (100 km) to kilometric scales can cause atmospheric circulations which themselves modify the boundary layer structure and cloud formation. (wavestoweather.de)
  • This and other performed case studies suggest the differentiation between three aerosol event types and their origin: Vertically limited aerosol layers in dry air, highly variable hygroscopic boundary layer aerosols and enhanced aerosol load across wide portions of the troposphere. (uni-potsdam.de)
  • It offers access to advanced technological platforms for exploration of the relevant atmospheric processes in the fields of climate change and air quality. (psi.ch)
  • Atmospheric composition and processes play a key role in environmental and societal challenges such as air quality, adverse health impacts or climate change. (psi.ch)
  • However, several processes that have mostly been realized by one-way coupling to date, such as marine biogeochemistry, nutrient cycling and atmospheric chemistry (e.g., aerosols), are not considered here. (lu.se)
  • The representation of small-scale oceanic processes, such as vertical mixing and sea-ice dynamics, appears essential to accurately resolve the air-sea heat exchange over the Baltic Sea, and these parameters can only be provided by online coupled high-resolution ocean models. (lu.se)
  • In addition, the coupling of wave models at the ocean-atmosphere interface allows for a more explicit formulation of small-scale to microphysical processes with local feedbacks to water temperature and large-scale processes such as oceanic upwelling. (lu.se)
  • This suggests the occurrence of aerosol transformation processes during the aerosol transport to Ny-Ålesund. (uni-potsdam.de)
  • An important advance in the remote sensing of aerosols is the development of continental-scale ground based lidar networks, which provide quality assured optical profiles on a large temporal and spatial scale. (inoe.ro)
  • The study was organized to address issues simultaneously relevant to atmospheric pollution and climate change, including (1) emission inventory assessment, (2) atmospheric transport and dispersion, (3) atmospheric chemical processing, and (4) cloud-aerosol interactions and aerosol radiative effects. (nasa.gov)
  • The purpose of the Frontal Air-Sea INteraction EXperiment (FASINEX) was to study the oceanic and atmospheric dynamics and interactions around a sea surface temperature front. (ucar.edu)
  • Aerosol composition and associated spatial distribution are key parameters for the improvement of the air quality and climate products. (eumetsat.int)
  • It is a radiometer dedicated to aerosol and cloud characterisation for climate monitoring, atmospheric composition, air quality and numerical weather prediction. (eumetsat.int)
  • Due to climate change, the number and intensity of wildfires are increasing, and with it the amounts of aerosol that are released into the atmosphere when biomass is burned. (leibniz-gemeinschaft.de)
  • Black Carbon (BC) aerosols are not only substantial climate-forcing drivers but also impact human health. (aaqr.org)
  • Black Carbon (BC) aerosols are termed as short-lived climate drivers and play a significant role in the Earth's climate system at regional and global scale. (aaqr.org)
  • In the framework of the Horizon Europe project CleanCloud TROPOS will join a European consortium of research institutions to prepare climate sciences for the transition of the atmospheric environment into a new post-fossil state (without combustion of fossil fuels). (iista.es)
  • The heterogeneous land surface and the aerosol background can therefore be a source of uncertainty for climate and weather prediction models. (wavestoweather.de)
  • The Koldewey Aerosol Raman LIDAR (KARL) is an The Arctic is a particularly sensitive area with respect to climate change due to the high surface albedo of snow and ice and the extreme radiative conditions. (uni-potsdam.de)
  • 2005). Aerosols have different scattering and absorption properties depending on their origin, and it is important to identify them in order to better quantify their radiative impact. (inoe.ro)
  • 2004) data are relevant for climatology, but also for special events, with strong aerosol influence: Saharan dust outbreaks, forest-fire smoke plumes transported over large areas, photochemical smog and volcano eruptions (e.g. (inoe.ro)
  • The Thompson Aerosol Aware microphysical scheme is applied, and auxiliary aerosol climatology is used. (ucar.edu)
  • A few types of aerosols present in elevated desert dust layer, biomass plume, winter haze can travel long distances and produce higher warming effects over the Himalayas and marine regions like the Bay of Bengal and Arabian Sea. (jcbose.ac.in)
  • BC aerosols are generated from incomplete combustion of fossil fuels, biofuels, and biomass. (aaqr.org)
  • The EOL data archive contains atmospheric, meteorological, and other geophysical datasets from operational sources and the scientific research programs and projects for which NCAR/EOL has provided data management support. (ucar.edu)
  • In the present paper, aerosol parameters in the lower troposphere are monitored using a plan position indicator (PPI) lidar, ground-sampling instruments (a nephelometer, an aethalometer, and optical particle counters), as well as a sunphotometer. (scirp.org)
  • By using a linear polarized laser beam, a linear particle depolarization ratio (δ) can be defined as the ratio of measured perpendicular backscatter intensity over parallel backscatter intensity with respect to the transmitter polarization axis: δ = I ⊥ I ∥ {\displaystyle \delta ={\frac {I_{\perp }}{I_{\parallel }}}} When this parameter is zero (the backscattered signal is linearly polarized), the cloud contains liquid spherical droplets. (wikipedia.org)
  • It infers nearly 50 aerosol and surface parameters, including particle size distribution, the spectral index of refraction, and the degree of sphericity and absorption. (eumetsat.int)
  • Here, we investigate the effect of including the particle linear depolarization ratio (δ) as a third input parameter for the inversion of lidar data. (herts.ac.uk)
  • Depending on the complexity of the system, a number of optical parameters (extensive and intensive) can be retrieved for the aerosol layers: aerosol optical depth, particle depolarization ratio, Angstrom exponent, color indexes and color ratios, lidar ratios. (inoe.ro)
  • Morales, A., D. J. Posselt, and H. Morrison, 2021: Which combinations of environmental conditions and microphysical parameter values produce a given orographic precipitation distribution? (nasa.gov)
  • In order to address broadband albedo susceptibility, one has to go beyond changes in cloud extinction stemming from modified effective droplet sizes and take into account perturbations in the cloud droplet asymmetry parameter and single scattering albedo as well. (confex.com)
  • and the solar 10.7 cm flux suggests that solar wind inputs connected to the troposphere via the global electric circuit, together with solar ultraviolet irradiance acting on the stratosphere, affect regional atmospheric dynamics. (climatedepot.com)
  • However, research into the dynamics of water molecules and ice germ physicochemical properties is needed to better constrain nucleation parameters. (nature.com)
  • This is vital for producing observational data products of high quality and with sufficient spatial coverage, making them openly available for any kind of users and services, and providing a platform for researchers to address the challenges associated with these atmospheric constituents in an effective and comprehensive manner. (psi.ch)
  • The spatial distribution of BC aerosols depends on the combination of anthropogenic activities and meteorological conditions. (aaqr.org)
  • For a full characterization of the aerosol distribution, lidar data have to be complemented by in situ (more physical information content) and integrated column (more spatial information content). (inoe.ro)
  • Another branch of Dr. Rocha-Lima's research is to investigate how Earth's atmospheric composition has been changing in the recent decades locally and globally, and which mechanisms associated to natural and/or anthropogenic sources have been driving those changes. (umbc.edu)
  • Atmospheric lidar is a class of instruments that uses laser light to study atmospheric properties from the ground up to the top of the atmosphere. (wikipedia.org)
  • Within ACTRIS, the primary objective is to obtain the vertical cloud structure within an atmospheric column, utilising the temporal dimension to yield the equivalent of a two-dimensional slice through the three-dimensional atmosphere. (actris.eu)
  • Section 4.6 suggest that they don't, and indeed I do not think that they should -- the water would probably be in the atmosphere anyway, as it is associated with the air mass, not the aerosols. (copernicus.org)
  • The project obtained concentrations of dimethyl sulfide (DMS), a biogenic precursor gas of sulfate aerosol in the marine atmosphere. (ucar.edu)
  • The aim of this study is to assess the use (e.g. computationally expensive elements, sensitivity studies) of the GRASP algorithm for future optimisation, in order to update the day 1 3MI Level 2 aerosol product generation which has a non-sufficient level of performances. (eumetsat.int)
  • The typical multiwavelength aerosol lidar data set for inversion of optical to microphysical parameters is composed of three backscatter coefficients (β) at 355, 532, and 1064 nm and two extinction coefficients (α) at 355 and 532 nm. (herts.ac.uk)
  • abstract = "The lidar development at the University of Hertfordshire explores the feasibility of using Raman backscattering for chemical aerosol profiling. (herts.ac.uk)
  • "Optical, microphysical and compositional properties of the Eyjafjallajökull volcanic ash" , Atmos. (umbc.edu)
  • Furthermore, stratospheric aerosol layers of volcanic origin were analyzed for several months, subsequently to the eruptions of the Kasatochi and Sarychev volcanoes in summer 2008 and 2009, respectively. (uni-potsdam.de)
  • Volcanic eruptions in the northern hemisphere in August 2008 and June 2009 arose the opportunity to analyze volcanic aerosol layers within the stratosphere. (uni-potsdam.de)
  • Find news and information on the latest results, outcomes and upcoming events in the domain of short-lived atmospheric constituents. (actris.eu)
  • The research programmes on trace gases (i.e. greenhouse gases, reactive air pollutants) and aerosols at the Jungfraujoch (JFJ, 3571 m a.s.l.) are among the most comprehensive worldwide. (psi.ch)
  • Nitrogen dioxide (NO 2 ) is a trace gas which is important for atmospheric chemistry and may affect human health. (copernicus.org)
  • The investigations are mainly included different types of ground-based instruments and space-borne sensors using different measurement techniques and innovative methodologies in various atmospheric conditions. (jcbose.ac.in)
  • Furthermore, a good representation of surface temperatures and roughness length over open sea and land areas is critical for the representation of climatic extremes such as heavy precipitation, storms, or tropical nights (defined as nights where the daily minimum temperature does not fall below 20gC), and these parameters appear to be sensitive to coupling. (lu.se)
  • In this project, we investigate the relative contribution of orographic features, land surface heterogeneities and heterogeneities in the aerosol field on cloud formation, cloud features, and subsequent precipitation. (wavestoweather.de)
  • Minimum concentrations are observed at all stations in the monsoon season due to the wet scavenging of aerosols by rain. (aaqr.org)
  • These challenges include the need to identify and then quantify the background (pre-modified) state of the cloud, the relationship between column aerosol optical depth and CCN concentrations at cloud level, and cloud-dependent dynamic/thermodynamic changes that coexist and can correlate with changes in aerosol amounts. (confex.com)
  • The measurement and in-flight characterization of atmospheric icing conditions remains a challenging task. (sae.org)
  • is a global network of sun/sky radiometers that is monitoring AOD (Aerosol Optical Depth) and aerosol optical properties for AOD trend analysis, optical properties characterization, and for validation of satellite retrievals (Dubovik O et.al 2002). (inoe.ro)
  • Especially, we consider Bayesian model averaging and uncertainty originating from aerosol model selection and imperfect forward modelling. (copernicus.org)
  • The paper focuses on the aerosol microphysical model selection and characterisation of uncertainty in the retrieved aerosol type and aerosol optical depth (AOD). (copernicus.org)
  • In a network all instruments should be calibrated in a consistent and traceable manner so that retrieved parameters can be derived on a comparable scale and with a known uncertainty. (actris.eu)
  • Minima in the indices were found on days of SWS minima during years of high stratospheric aerosol loading. (climatedepot.com)
  • Developed and tested a 27 km global model of the atmospheric-only component of the IITM-ESM for downscaling studies in the coming years (2020-24). (moes.gov.in)
  • Dear all, I have a small query regarding the computation of the perturbation in atmospheric variables due to aerosol-cloud interaction (ACI) using the WRF-Chem model. (ucar.edu)
  • It is now equipped with a new telescope mirror and new detection optics, which facilitate atmospheric profiling from 450m above sea level up to the mid-stratosphere. (uni-potsdam.de)
  • Thus, the model can represent various dust shapes by adjusting the tunable parameters. (copernicus.org)
  • We find that input data sets that include δ355 give a spheroid fraction that closely resembles the dust ratio we obtain from using β532 and δ532 in a methodology applied in aerosol-type separation. (herts.ac.uk)
  • Studies investigating the modification of cloud microphysical and optical properties by anthropogenic aerosol have become more numerous in recent years, in no small part because of the availability of new ground- and space-based observational systems, as well as the development of models that attempt to account for aerosol sources and transport. (confex.com)
  • Impacts of increasing aridity and wildfires on aerosol loading in the intermountain Western US. (utah.edu)
  • We present a methodology in Bayesian framework for retrieving atmospheric aerosol optical depth and aerosol type from the pre-computed look-up tables (LUTs). (copernicus.org)
  • Similar techniques were also developed in the U.S.S.R. The searchlight beam technique continued to improve after the end of the War, with more precise instruments and new atmospheric parameters, like temperature At the same time, pulsed light was used to construct a rangefinder to measure the distance of objects, but remained only an experimental design. (wikipedia.org)
  • These points must be addressed to derive network-wide consistent atmospheric quantities, such as cloud classification, liquid water content profiles as well as temperature and humidity profiles. (actris.eu)
  • Multiple scattering effects in droplet aerosols were investigated theoretically using three different numerical approaches and experimentally by means of a specially developed measuring system. (spie.org)
  • In this regard, the previously introduced concept of "cloud albedo susceptibility", a sensitivity parameter referring to cloud albedo changes for a 1 cm -3 change in cloud droplet number concentration under constant liquid water content conditions, is appropriate. (confex.com)
  • CALIOP) by calculating the 532nm aerosol backscatter coefficient, taking it as the control variable to provide microphysical constraints during the transport. (hal.science)
  • This increases the level of confidence in the aerosol typing decisions and/or validates the lidar retrievals. (inoe.ro)
  • Hygroscopic growth of water soluble organic carbon isolated from atmospheric aerosol collected at US national parks and Storm Peak Laboratory. (utah.edu)
  • Results show significant inhomogeneity of in-cloud time scales, which leads to inhomogeneity in cloud microphysical parameters. (ametsoc.org)