A5051795248- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Aeolian processes and effects
- Air Quality Monitoring and Forecasting
- Energy and Environment Impacts
- Vehicle emissions and performance
- COVID-19 impact on air quality
- Climate variability and models
- Meteorological Phenomena and Simulations
- Noise Effects and Management
- Climate Change and Health Impacts
- Landfill Environmental Impact Studies
- Aviation Industry Analysis and Trends
- Thermochemical Biomass Conversion Processes
- Ocean Waves and Remote Sensing
- Fire effects on ecosystems
- Mercury impact and mitigation studies
- Impact of Light on Environment and Health
- Energy, Environment, and Transportation Policies
- Hydrology and Drought Analysis
- Respiratory viral infections research
- Flood Risk Assessment and Management
North-West University
2016-2025
Science North
2025
Northwest University
2024
Institute for Environmental Management
2021
University of the Witwatersrand
2006-2017
Royal Netherlands Meteorological Institute
2017
University of Miami
2016
Laboratoire Interuniversitaire des Systèmes Atmosphériques
2016
University of Exeter
2016
University of Washington
2016
The paper presents the current status of Maritime Aerosol Network (MAN), which has been developed as a component Robotic (AERONET). MAN deploys Microtops handheld Sun photometers and utilizes calibration procedure data processing (Version 2) traceable to AERONET. A web site dedicated activity is described. brief historical perspective given aerosol optical depth (AOD) measurements over oceans. short summary existing data, collected on board ships opportunity during NASA Sensor...
Abstract. Southern Africa produces almost a third of the Earth's biomass burning (BB) aerosol particles, yet fate these particles and their influence on regional global climate is poorly understood. ORACLES (ObseRvations Aerosols above CLouds intEractionS) 5-year NASA EVS-2 (Earth Venture Suborbital-2) investigation with three intensive observation periods designed to study key atmospheric processes that determine impacts aerosols. During Hemisphere winter spring (June–October), reaching 3–5...
CORRESPONDING AUTHOR: Paquita Zuidema, Rosenstiel School of Marine and Atmospheric Science, University Miami, FL, 33149, E-mail: pzuidema@rsmas.miami.edu
Abstract. The optical properties of airborne mineral dust depend on its mineralogy, size distribution, and shape, they might vary between different source regions. To date, large differences in refractive index values found the literature have not been fully explained. In this paper we present a new dataset complex indices (m=n-ik) single-scattering albedos (SSAs) for 19 aerosols over 370–950 nm range dry conditions. Dust were generated from natural parent soils eight regions (northern...
This global study, which has been coordinated by the World Meteorological Organization Global Atmospheric Watch (WMO/GAW) programme, aims to understand behaviour of key air pollutant species during COVID-19 pandemic period exceptionally low emissions across globe. We investigated effects differences in both and regional local meteorology 2020 compared with 2015–2019. By adopting a globally consistent approach, this comprehensive observational analysis focuses on changes quality around cities...
Abstract. Modeling the interaction of dust with long-wave (LW) radiation is still a challenge because scarcity information on complex refractive index from different source regions. In particular, little known about variability as function mineralogical composition, which depends specific emission source, and its size distribution, modified during transport. As consequence, to date, climate models remote sensing retrievals generally use spatially invariant time-constant value for LW index....
Abstract The Aerosol, Radiation and Clouds in southern Africa (AEROCLO-sA) project investigates the role of aerosols on regional climate Africa. This is a unique environment where natural anthropogenic semipermanent widespread stratocumulus (Sc) cloud deck are found. aims to understand dynamical, chemical, radiative processes involved aerosol–cloud–radiation interactions over land ocean under various meteorological conditions. AEROCLO-sA field campaign was conducted August September 2017...
BackgroundData on influenza community burden and transmission are important to plan interventions especially in resource-limited settings. However, data limited, particularly from low-income middle-income countries. We aimed evaluate the of a rural an urban setting South Africa.MethodsIn this prospective cohort study approximately 50 households were selected sequentially both (Agincourt, Mpumalanga Province, Africa; with health sociodemographic surveillance system) (Klerksdorp, Northwest...
Measurements of the column‐integrated aerosol optical properties in southern African region were made by Aerosol Robotic Network (AERONET) Sun‐sky radiometers at several sites August–September 2000 as a part Southern Regional Science Initiative (SAFARI) dry season field campaign. Fine mode biomass burning aerosols dominated northern study (Zambia), which is an active region, and other including fossil fuel burning, industrial, aeolian coarse types also contributed to mixture regions (South...
Abstract As a representative site of the southern African biomass‐burning region, sun‐sky data from 15 year Aerosol Robotic Network (AERONET) deployment at Mongu, Zambia, was analyzed. For season months (July–November), we investigate seasonal trends in aerosol single scattering albedo (SSA), size distributions, and refractive indices almucantar sky scan retrievals. The monthly mean 440 nm Mongu found to increase significantly ~0.84 July ~0.93 November (from 0.78 0.90 675 these same months)....
Abstract. This paper presents new laboratory measurements of the mass absorption efficiency (MAE) between 375 and 850 nm for 12 individual samples mineral dust from different source areas worldwide in two size classes: PM10. 6 (mass fraction particles aerodynamic diameter lower than 10.6 µm) PM2. 5 2.5 µm). The experiments were performed CESAM simulation chamber using generated natural parent soils included optical gravimetric analyses. results show that MAE values are (range 37–135 × 10−3...
We present a comprehensive overview of particulate air quality across the five major metropolitan areas South Africa (Cape Town, Bloemfontein, Johannesburg and Tshwane (Gauteng Province), Industrial Highveld Air Quality Priority Area (HVAPA), Durban), based on decadal (1 January 2000 to 31 December 2009) aerosol climatology from multiple satellite platforms detailed analysis ground-based data 19 sites throughout Gauteng Province. Satellite was optical depth (AOD) MODIS Aqua Terra (550 nm)...
Abstract. Southern Africa produces almost a third of the Earth’s biomass burning (BB) aerosol particles, yet fate these particles and their influence on regional global climate is poorly understood. ORACLES (ObseRvations Aerosols above CLouds intEractionS) five-year NASA EVS-2 (Earth Venture Suborbital-2) investigation with three Intensive Observation Periods designed to study key atmospheric processes that determine impacts aerosols. During Hemisphere winter spring (June-October), reaching...
Abstract. Over the past 24 years, AErosol RObotic NETwork (AERONET) program has provided highly accurate remote-sensing characterization of aerosol optical and physical properties for an increasingly extensive geographic distribution including all continents many oceanic island coastal sites. The measurements retrievals from AERONET global network have addressed satellite model validation needs very well, but there been challenges in making comparisons to similar parameters situ surface...
Abstract. The southeast Atlantic (SEA) region is host to a climatologically significant biomass burning aerosol layer overlying marine stratocumulus. We present the first results of directly measured above-cloud optical depth (ACAOD) from recent ObseRvations Aerosols above CLouds and their intEractionS (ORACLES) airborne field campaign during August September 2016. In our analysis, we use data Spectrometers for Sky-Scanning Sun-Tracking Atmospheric Research (4STAR) instrument found an...
This commentary paper from the recently formed International Global Atmospheric Chemistry (IGAC) Southern Hemisphere Working Group outlines key issues in atmospheric composition research that particularly impact Hemisphere. In this article, we present a broad overview of many challenges for understanding chemistry Hemisphere, before focusing on most significant factors differentiate it Northern We sections importance biogenic emissions and fires showing these often dominate over...
Abstract Data on respiratory syncytial virus (RSV) incidence and household transmission are limited. To describe RSV transmission, we conducted a prospective cohort study in rural urban communities South Africa over two seasons during 2017-2018. Nasopharyngeal swabs were collected twice-weekly for 10 months annually tested using PCR. We 81,430 samples from 1,116 participants 225 households (follow-up 90%). 32% (359/1116) of individuals had ≥1 infection; 10% (37/359) repeat infection the same...
Abstract. This paper presents the first investigation of solubility iron in mineral dust aerosols collected at Henties Bay Aerosol Observatory (HBAO), Namibia, from April to December 2017. During study period, 10 intense events occurred. Elemental reached peak concentrations as high 1.5 µg m−3, significantly higher than background levels. These are attributed wind erosion natural soils surrounding gravel plains Namib desert. The composition sampled is found be overall similar that northern...
Abstract This pioneering study evaluates the prevalence of aeroallergens reactivity among atopic populations living in Vaal Triangle Airshed Priority Area (VTAPA), South Africa. A total 138 volunteers (51 males and 87 females), African, colored, white, Asian ethnicity, with a mean (range) age 22 (18–56) years were participating study. The was conducted on North-West University (NWU) campus Vanderbijlpark/VTAPA. International Study Asthma Allergies Childhood questionnaire utilized for...
High-resolution stable isotope variations and growth structure analyses of the last three millennia a 6600-year stalagmite record at Cold Air Cave, Makapansgat Valley, South Africa, are presented. Growth layers, which measurable over 250 years, shown to be annual. The correlation between width layers precipitation is strongly positive. Changes inδ 18 O andδ 13 C positively correlated inversely changes in colour stalagmite. Variations directly with mean annual temperature. Dark colouration...
As part of the United Arab Emirates Unified Aerosol Experiment (UAE 2 ), size distribution and chemistry dust particles were measured for months August September 2004 at an Arabian Gulf coastal site impacted by from several sources within southwest Asia. The characteristics common mode (0.8 < d p 10 μ m) examined using aerodynamic particle sizer (APS), a DRUM cascade impactor, AERONET Sun/sky retrievals. While properties these distinct methods do correlate, accurate measurement is still...
Abstract. In this paper we introduce new in situ observations of atmospheric aerosols, especially chemical composition, physical and optical properties, on the eastern brink heavily polluted Highveld area South Africa. During observation period between 11 February 2009 31 January 2011, mean particle number concentration (size range 10–840 nm) was 6310 cm3 estimated volume sub-10 μm particles 9.3 μm3 m−3. The aerosol absorption scattering coefficients at 637 nm were 8.3 Mm−1 49.5 Mm−1,...
One of the key challenges noted in sustainable development goals for good health and wellbeing (SDGs 3) is both ambient household air pollution. Household solid fuel combustion represents one biggest threat to human South Africa. This study helps understand impact burning an indoor environment. Continuous monitoring particulate matter (PM4) was carried out two houses, used coal as a primary source energy, while other did not. For (SFB) house winter PM4 average 24-h concentration ranges...