A5088102889- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Urban Heat Island Mitigation
- Atmospheric aerosols and clouds
- Wind and Air Flow Studies
- Air Quality Monitoring and Forecasting
- Building Energy and Comfort Optimization
- Vehicle emissions and performance
- Phytochemicals and Antioxidant Activities
- Advanced Chemical Sensor Technologies
- Environmental and Industrial Safety
- Advanced Combustion Engine Technologies
- Carcinogens and Genotoxicity Assessment
- Smoking Behavior and Cessation
- Chronic Obstructive Pulmonary Disease (COPD) Research
- Catalytic Processes in Materials Science
Hamad bin Khalifa University
2022-2024
Qatar Foundation
2022
Aarhus University
2020-2022
King Abdullah University of Science and Technology
2020-2021
Indian Institute of Technology Kanpur
2017-2019
Dimethyl sulfide (DMS) is produced by plankton in oceans and constitutes the largest natural emission of sulfur to atmosphere. In this work, we examine new particle formation from primary pathway oxidation gas-phase DMS OH radicals. We particularly focus on growth mass yield as studied experimentally under dry conditions using atmospheric simulation chamber AURA. Experimentally, show that aerosol yields 50–200 ppb are low (2–7%) rates (8.2–24.4 nm/h) comparable with ambient observations. An...
The state of Qatar has been experiencing rapid urbanization with around 85% its population residing in Doha. country faces notable challenges related to the Urban Heat Island (UHI) effect, which is exacerbated by hot and humid desert climate. This study focuses on analyzing UHI phenomenon Doha, utilizing observed meteorological data Weather Research Forecasting model (WRF v4.5). Two land use cover (LULC) datasets from 2001 2018 are employed, simulations conducted using different urban canopy...
Discriminating the absorption coefficients of aerosol mineral dust and black carbon (BC) in different size fractions is a challenge because BC's large mass cross-section compared to dust. Ambient wavelength dependent (babs) supermicron submicron were determined with high time resolution. The measurements performed simultaneously using identical systems at an urban regional background site Qatar. At each site, taken by co-located Aethalometers, one virtual impactor (VI) other PM1 cyclone...
Background: E-cigarette use has been shown to have short-term acute effects among active users but less is known of the passive effects, particularly individuals with existing respiratory diseases. Objective: To investigate local and systemic vape exposure patients mild or moderate chronic obstructive pulmonary disease (COPD). Methods: In a double-blinded crossover study 16 non-smoking COPD-patients (mean age 68) were randomly exposed for 4 h (median PM2.5: 18 µg/m3 (range: 8-333)) clean air...
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Abstract. Dimethyl sulfide (DMS) is emitted by phytoplankton species in the oceans and constitutes largest source of naturally sulfur to atmosphere. The climate impact secondary particles, formed through oxidation DMS hydroxyl radicals, still elusive. This study investigates hygroscopicity cloud condensation nuclei activity such particles discusses results relation their chemical composition. We show that mean parameters, κ, during an experiment for 80 nm diameter range from 0.46 0.52 or...
This work highlights the first multiweek size-resolved analysis of high-resolution (HR) mass spectra from Aerodyne aerosol spectrometer (AMS). High-resolution allows for separation isobaric interferences in and provides a more detailed view dynamic process by which both composition size distribution change atmosphere. The data used this were obtained Indo-Gangetic Plain (IGP) during winter 2016 1 to 31 January. We report temporal variations particulate matter < μm (PM1) link them observed...
Qatar has witnessed substantial urbanization in recent years; the Doha metropolitan area grew by approximately a factor of 8 between 1984 and 2020, while bare land was reduced more than 50%. Recent Climate projections mark Middle East as climate change hotspot, making it an ideal region for studying its implications. The distribution Urban heat island effect modification with over tropical desert city Doha, is investigated using high-resolution Weather Research Forecasting (WRF-ARW) model...
The state of Qatar has been experiencing rapid urbanization with around 85% its population residing in Doha. country faces notable challenges related to the Urban Heat Island (UHI) effect, which is exacerbated by hot and humid desert climate. This study focuses on analyzing UHI phenomenon Doha, utilizing observed meteorological data Weather Research Forecasting model (WRF v4.5). Two land use cover (LULC) datasets from 2001 2018 are employed, simulations conducted using different urban canopy...
Abstract. Dimethyl sulphide (DMS) is emitted by phytoplankton species in the oceans and constitutes largest source of naturally sulphur to atmosphere. The climate impact secondary particles, formed through oxidation DMS hydroxyl radicals, still elusive. This study investigates hygroscopicity cloud condensation nuclei activity such particles discusses results relation their chemical composition. We show that mean parameters, κ, during an experiment for 80 nm diameter range from 0.46 0.52 as...