A5087614187- Mercury impact and mitigation studies
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Toxic Organic Pollutants Impact
- Atmospheric Ozone and Climate
- Heavy metals in environment
- Vehicle emissions and performance
- Ionosphere and magnetosphere dynamics
- Fuel Cells and Related Materials
- Meteorological Phenomena and Simulations
- Geophysics and Gravity Measurements
- Electrochemical Analysis and Applications
- Climate variability and models
- GNSS positioning and interference
- Energy and Environment Impacts
- Solar Radiation and Photovoltaics
- Atmospheric aerosols and clouds
- Marine and coastal ecosystems
- Climate change and permafrost
- Planetary Science and Exploration
- Nanoparticles: synthesis and applications
- Complex Systems and Time Series Analysis
- Adsorption and biosorption for pollutant removal
- Statistical Mechanics and Entropy
South African Weather Service
2015-2025
North-West University
2023-2025
University of the Western Cape
2013
Stellenbosch University
2009
University of Bern
2003-2006
Long-term monitoring of data ambient mercury (Hg) on a global scale to assess its emission, transport, atmospheric chemistry, and deposition processes is vital understanding the impact Hg pollution environment. The Global Mercury Observation System (GMOS) project was funded by European Commission (http://www.gmos.eu) started in November 2010 with overall goal develop coordinated observing system monitor scale, including large network ground-based stations, ad hoc periodic oceanographic...
Abstract. The atmospheric deposition of mercury (Hg) occurs via several mechanisms, including dry and wet scavenging by precipitation events. In an effort to understand the cycling seasonal depositional characteristics Hg, samples were collected for approximately 5 years at 17 selected GMOS monitoring sites located in Northern Southern hemispheres framework Global Mercury Observation System (GMOS) project. Total (THg) exhibited annual patterns Hg samples. Interannual differences total are...
Abstract. Current understanding of mercury (Hg) behavior in the atmosphere contains significant gaps. Some key characteristics Hg processes, including anthropogenic and geogenic emissions, atmospheric chemistry, air–surface exchange, are still poorly known. This study provides a complex analysis processes governing fate involving both measured data from ground-based sites simulation results chemical transport models. A variety long-term measurements gaseous elemental (GEM) reactive (RM)...
The interplay between microbes and atmospheric physical chemical conditions is an open field of research that can only be fully addressed using multidisciplinary approaches. lack coordinated efforts to gather data at representative temporal spatial scales limits aerobiology help understand large scale patterns global microbial biodiversity its causal relationships with the environmental context. This paper presents sampling strategy analytical protocols developed in order integrate different...
This study evaluates the Mercury Passive Air Sampler ( Mer PAS®) as a cost-effective alternative to active sampling for atmospheric mercury monitoring at Welgegund measurement station in South Africa.
Abstract. The Minamata Convention on Mercury (Hg) entered into force in 2017, committing its 116 parties (as of January 2019) to curb anthropogenic emissions. Monitoring atmospheric concentrations and trends is an important part the effectiveness evaluation convention. A few years ago (in 2017) we reported increasing trend Hg at Cape Point Global Atmosphere Watch (GAW) station South Africa (34.3535∘ S, 18.4897∘ E) for 2007–2015 period. With 2 more measurements 2012–2017 data from Amsterdam...
Abstract. Long-term measurements of gaseous elemental mercury (GEM) concentrations at Cape Point, South Africa, reveal a downward trend between September 1995 and December 2005 an upward one from March 2007 until June 2015, implying change in sign 2004 2007. The is qualitatively consistent with the changes GEM observed Mace Head, Ireland, wet deposition over North America, suggesting worldwide emissions. Seasonally resolved trends suggest modulation overall by regional processes. absolute...
Abstract. Long-term monitoring data of ambient mercury (Hg) on a global scale to assess its emission, transport, atmospheric chemistry, and deposition processes is vital understanding the impact Hg pollution environment. The Global Mercury Observation System (GMOS) project was funded by European Commission (www.gmos.eu), started in November 2010 with overall goal develop coordinated observing system monitor scale, including large network ground-based stations, ad-hoc periodic oceanographic...
Abstract The El Niño–Southern Oscillation (ENSO) affects the tropospheric concentrations of many trace gases. Here we investigate ENSO influence on mercury measured in upper troposphere during Civil Aircraft for Regular Investigation atmosphere Based an Instrumented Container flights and at ground Cape Point, South Africa, Mace Head, Ireland. Mercury cross‐correlate with Southern Index (SOI) a lag 8 ± 2 months. Highest are always found most negative SOI values, i.e., months after Niño,...
Abstract. Mercury (Hg) contamination is ubiquitous. In order to assess its emissions, transport, atmospheric reactivity, and deposition pathways, worldwide Hg monitoring has been implemented over the past 10–20 years, albeit with only a few stations in Southern Hemisphere. Consequently, little known about relative contribution of marine terrestrial sources, which important context growing interest effectiveness evaluation mitigation policies. This paper constitutes Part 2 study describing...
Abstract. The STARTWAVE (STudies in Atmospheric Radiative Transfer and Water Vapour Effects) project aims to investigate the role which water vapour plays climate system, particular its interaction with radiation. Within this framework, an ongoing database was set up comprises integrated (IWV) measurements made over last ten years by ground-based microwave radiometers, Global Positioning System (GPS) receivers sun photometers located throughout Switzerland at altitudes between 330 3584 m. At...
It has been demonstrated that benzene, toluene, and xylene are carcinogens. Its combined effects with other contaminants have the potential to harm several ecosystem components. Since most human benzene exposure takes place inside, it is important understand how outdoor emissions from traffic industry affect interior concentrations. However, this area of study not received enough attention date. Herein, we examine concentrations (BTX) in a Steelpoort mining area. BTX pollutants were...
Abstract. Current understanding of mercury (Hg) behaviour in the atmosphere contains significant gaps. Some key characteristics Hg processes including anthropogenic and geogenic emissions, atmospheric chemistry, air-surface exchange are still poorly known. This study provides a complex analysis governing fate involving both measurement data from ground-based sites simulation results chemical transport models. A variety long-term measurements gaseous elemental (GEM) reactive (RM)...
The probability density function (PDF) of the time intervals between subsequent extreme events in atmospheric Hg0 concentration data series from different latitudes has been investigated. dynamic possesses a long-term memory autocorrelation function. Above fixed threshold Q data, PDFs interoccurrence are well described by Tsallis q-Exponential This PDF behavior explained framework superstatistics, where competition multiple mesoscopic processes affects macroscopic dynamics. An extensive...
Abstract. The atmospheric deposition of mercury (Hg) occurs via several mechanisms including dry and wet scavenging by precipitation events. In an effort to understand the cycling seasonal depositional characteristics Hg, samples were collected for approximately five years at 17 selected GMOS monitoring sites located in Northern Southern Hemispheres framework Global Mercury Observation System (GMOS) project. Total (THg) exhibited annual patterns Hg samples. Inter-annual differences total are...
The Global Mercury Observation System (GMOS) network, initially a five-year project (2010-2015) funded by the European Commission, continued as GEO Flagship program to support for (GOS4M). GMOS was envisioned coordinated global observing system monitor atmospheric mercury (Hg) on scale, and evaluate effective implementation of Minamata Convention (MCM). Twenty-eight ground-based stations have been involved in monitoring activities, following sampling protocols data quality control...