A5066556450- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Spectroscopy and Laser Applications
- Indoor Air Quality and Microbial Exposure
- Aeolian processes and effects
- Vehicle emissions and performance
- Atmospheric and Environmental Gas Dynamics
- nanoparticles nucleation surface interactions
- Climate Change and Health Impacts
- Microbial Community Ecology and Physiology
- Energy and Environment Impacts
- Freezing and Crystallization Processes
- Catalytic Processes in Materials Science
- Plant responses to elevated CO2
- Marine and coastal ecosystems
- Physiological and biochemical adaptations
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Toxic Organic Pollutants Impact
- Advanced Chemical Physics Studies
- Icing and De-icing Technologies
- Odor and Emission Control Technologies
Weizmann Institute of Science
2016-2025
Planetary Science Institute
2015-2025
Fudan University
2025
University of Leeds
2023
Melodea (Israel)
2014-2023
NOAA Physical Sciences Laboratory
2016
Texas A&M University
2014
American Geophysical Union
2012
Agricultural Research Organization
2009
Finnish Meteorological Institute
2008
Abstract. Secondary organic aerosol (SOA) accounts for a significant fraction of ambient tropospheric and detailed knowledge the formation, properties transformation SOA is therefore required to evaluate its impact on atmospheric processes, climate human health. The chemical physical processes associated with formation are complex varied, and, despite considerable progress in recent years, quantitative predictive understanding does not exist represents major research challenge science. This...
Abstract. In this study we compile and present results from the factor analysis of 43 Aerosol Mass Spectrometer (AMS) datasets (27 are reanalyzed in work). The components all sites, when taken together, provide a holistic overview Northern Hemisphere organic aerosol (OA) its evolution atmosphere. At most OA can be separated into oxygenated (OOA), hydrocarbon-like (HOA), sometimes other such as biomass burning (BBOA). We focus on OOA work. many analyses, further deconvolved low-volatility...
Abstract. The literature on atmospheric particulate matter (PM), or aerosol, has increased enormously over the last 2 decades and amounts now to some 1500–2000 papers per year in refereed literature. This is part due enormous advances measurement technologies, which have allowed for an increasingly accurate understanding of chemical composition physical properties particles their processes atmosphere. growing scientific interest aerosol high importance environmental policy. In fact,...
The effect of desert dust on cloud properties and precipitation has so far been studied solely by using theoretical models, which predict that rainfall would be enhanced. Here we present observations showing the contrary; is to inhibit precipitation. Using satellite aircraft show clouds forming within contain small droplets produce little drop coalescence. Measurement size distribution chemical analysis individual Saharan particles collected in such a storm suggest possible mechanism for...
Abstract. A class of organic molecules extracted from atmospheric aerosol particles and isolated fog cloud water has been termed HUmic-LIke Substances (HULIS) due to a certain resemblance terrestrial aquatic humic fulvic acids. In light the interest that this compounds currently attracts, we comprehensively review HULIS properties, as well laboratory field investigations concerning their formation characterization in samples. While sharing some important features such polyacidic nature,...
Clouds developing in a polluted environment tend to have more numerous but smaller droplets. This property may lead suppression of precipitation and longer cloud lifetime. Absorption incoming solar radiation by aerosols, however, can reduce the cover. The net aerosol effect on clouds is currently largest uncertainty evaluating climate forcing. Using large statistics 1-km resolution MODIS (Moderate Resolution Imaging Spectroradiometer) satellite data, we study shallow water clouds, separately...
Clouds and precipitation play crucial roles in the Earth's energy balance, global atmospheric circulation availability of fresh water. Aerosols may modify cloud properties formation by modifying concentration size droplets, consequently strength convection, height glaciation levels thus affecting patterns. Here we evaluate aerosol effect on clouds, using large statistics daily satellite data over North Atlantic Ocean. We found a strong correlation between presence aerosols structural...
Oxidation of biogenic volatile organic compounds (BVOC) by the nitrate radical (NO3) represents one important interactions between anthropogenic emissions related to combustion and natural from biosphere. This interaction has been recognized for more than 3 decades, during which time a large body research emerged laboratory, field, modeling studies. NO3-BVOC reactions influence air quality, climate visibility through regional global budgets reactive nitrogen (particularly nitrates), ozone,...
Abstract. A workshop was held in the framework of ACCENT (Atmospheric Composition Change – a European Network) Joint Research Programme on "Aerosols" and "Access to Laboratory Data". The aim hold "Gordon Conference" type discussion covering accommodation reactive uptake water vapour trace pollutant gases condensed phase atmospheric materials. scope review define current state knowledge coefficients for droplet ice surfaces, gas species variety different surfaces characteristic particulate...
Abstract Observation‐based and modeling studies have identified the Eastern Mediterranean Middle East (EMME) region as a prominent climate change hotspot. While several initiatives addressed impacts of in parts EMME, here we present an updated assessment, covering wide range timescales, phenomena future pathways. Our assessment is based on revised analysis recent observations projections extensive overview scientific literature causes effects regional change. Greenhouse gas emissions EMME...
Lag Ba'Omer, a nationwide bonfire festival in Israel, was chosen as case study to investigate the influence of major biomass burning event on light absorption properties atmospheric brown carbon (BrC). The chemical composition and optical BrC chromophores were investigated using high performance liquid chromatography (HPLC) platform coupled photo diode array (PDA) resolution mass spectrometry (HRMS) detectors. Substantial increase coefficient observed during night-long event. Most attributed...
Cloud and aerosols interact form a complex system leading to high uncertainty in understanding climate change. To simplify this non‐linear it is customary distinguish between “cloudy” “cloud‐free” areas measure them separately. However, we find that clouds are surrounded by “twilight zone” – belt of forming evaporating cloud fragments hydrated extending tens kilometers from the into so‐called cloud‐free zone. The gradual transition cloudy dry atmosphere proportional aerosol loading,...
About 40 million tons of dust are transported annually from the Sahara to Amazon basin. Saharan has been proposed be main mineral source that fertilizes basin, generating a dependence health and productivity rain forest on supply Sahara. Here we show about half annual basin is emitted single source: Bodélé depression located northeast Lake Chad, approximately 0.5% size or 0.2% Placed in narrow path between two mountain chains direct accelerate surface winds over depression, emits 40% winter...
Abstract. Aerosols and clouds play central roles in atmospheric chemistry physics, climate, air pollution, public health. The mechanistic understanding predictability of aerosol cloud properties, interactions, transformations, effects are, however, still very limited. This is due not only to the limited availability measurement data, but also applicability compatibility model formalisms used for analysis, interpretation, description heterogeneous multiphase processes. To support...
Abstract Anthropogenic pollution from marine microplastic particles is a growing concern, both as source of toxic compounds, and because they can transport pathogens other pollutants. Airborne were previously observed over terrestrial coastal locations, but not in the remote ocean. Here, we collected ambient aerosol samples North Atlantic Ocean, including atmosphere, during Tara Pacific expedition May-June 2016, chemically characterized them using micro-Raman spectroscopy. We detected range...
Abstract. The Surface PARTiculate mAtter Network (SPARTAN) is a long-term project that includes characterization of chemical and physical attributes aerosols from filter samples collected worldwide. This paper discusses the ongoing efforts SPARTAN to define quantify major ions trace metals found in fine particulate matter (PM2.5). Our methods infer spatial temporal variability PM2.5 cost-effective manner. Gravimetrically weighed filters represent multi-day averages PM2.5, with collocated...
Atmospheric brown carbon (BrC) is an important contributor to the radiative forcing of climate by organic aerosols. Because molecular diversity BrC compounds and their dynamic transformations, it challenging predictively understand optical properties. OH radical O3 reactions, together with photolysis, lead diminished light absorption lower warming effects biomass burning BrC. The night-time aging on properties aerosols are less known. To address this knowledge gap, NO3 chemistry tar from...
Abstract SARS-CoV-2 is continually evolving, with more contagious mutations spreading rapidly. Using in vitro evolution to affinity maturate the receptor-binding domain (RBD) of spike protein towards ACE2 resulted mutations, S477N, E484K, and N501Y, be among first selected, explaining convergent “European” (20E-EU1), “British” (501.V1),”South African” (501.V2), ‘‘Brazilian” variants (501.V3). Plotting binding all RBD against their incidence population shows a strong correlation between two....
This study provides molecular insights into the light absorption properties of biomass burning (BB) brown carbon (BrC) through chemical characterization tar condensates generated from heated wood pellets at oxidative and pyrolysis conditions. Both liquid separated "darker oily" "lighter aqueous" immiscible phases. The composition these samples was investigated using reversed-phase chromatography coupled with a photodiode array detector high-resolution mass spectrometer. results revealed two...
We investigate the chemical composition of organic light-absorbing components, also known as brown carbon (BrC) chromophores, formed in a proxy anthropogenic secondary aerosol generated from photooxidation naphthalene (naph-SOA) absence and presence NOx. High-performance liquid chromatography equipped with photodiode array detector electrospray ionization high-resolution mass spectrometer is employed to characterize naph-SOA its BrC components. provide molecular-level insights into optical...