A5058763308- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Spectroscopy and Laser Applications
- Atmospheric aerosols and clouds
- COVID-19 impact on air quality
- Energy and Environment Impacts
- Air Traffic Management and Optimization
- Groundwater and Isotope Geochemistry
- Water Quality Monitoring Technologies
- Advanced Chemical Sensor Technologies
- Fire effects on ecosystems
- Ocean Acidification Effects and Responses
- Hydrocarbon exploration and reservoir analysis
- Water Quality Monitoring and Analysis
- Belt and Road Initiative
- Smart Materials for Construction
- Health, Environment, Cognitive Aging
- Oil, Gas, and Environmental Issues
- Climate Change and Health Impacts
- Urban Green Space and Health
- Aerodynamics and Acoustics in Jet Flows
Imperial College London
2022-2024
MRC Centre for Environment and Health
2023
Cranfield University
2016-2022
International Centre for Integrated Mountain Development
2021
University of Manchester
2015-2019
University of Cambridge
2010-2018
University of Malaya
2014-2017
University of Bristol
2007-2009
Low cost sensors are becoming increasingly available for studying urban air quality. Here we show how such sensors, deployed as a network, provide unprecedented insights into the patterns of pollutant emissions, in this case at London Heathrow Airport (LHR). Measurements from sensor network were used to unequivocally distinguish airport emissions long range transport, and then infer emission indices various activities. These constrain an quality model (ADMS-Airport), creating powerful...
To carry out detailed source attribution for air quality assessment it is necessary to distinguish pollutant contributions that arise from local emissions those attributable non-local or regional emission sources. Frequently this requires the use of complex models and inversion methods, prior knowledge assumptions regarding pollution environment. In paper we demonstrate how high spatial density fast response measurements low-cost sensor networks may facilitate separation. A purely...
Recent studies have shown that (three-electrode) electrochemical sensors can be utilised for air quality monitoring and exposure assessment. The long-term performance of these is however, often limited by the effects ambient meteorological parameters on sensor baseline, in particular temperature. If (EC) are to adopted measurement over extended periods (months), this effect must accounted for. long-term, measurements CO, NO NO2 using EC revealed temperature (and relative humidity (RH)) had...
This paper describes the development of a new sampling and measurement method to infer methane flux using proxy measurements CO2 concentration wind data recorded by Unmanned Aerial Systems (UAS). The described trialed here is appropriate spatial scale landfill sites analogous greenhouse gas emission hotspots, making it an important for low-cost rapid case study quantification fluxes from currently uncertain (but highly important) sources. We present these UAS-based derive instantaneous test...
Abstract. During June, July and August 2006 five aircraft took part in a campaign over West Africa to observe the aerosol content chemical composition of troposphere lower stratosphere as African Monsoon Multidisciplinary Analysis (AMMA) project. These are first such measurements this region during monsoon period. In addition providing an overview tropospheric composition, paper provides description measurement strategy (flights performed, instrumental payloads, wing-tip comparisons) points...
Abstract. Large and effective reductions in emissions of long-lived ozone-depleting substance (ODS) are being achieved through the Montreal Protocol, effectiveness which can be seen declining atmospheric abundances many ODSs. An important remaining uncertainty concerns role very short-lived substances (VSLSs) which, owing to their relatively short lifetimes (less than 6 months), not regulated under Protocol. Recent studies have found an unexplained increase global tropospheric abundance one...
Abstract. Air quality on the east coast of Peninsular Malaysia is influenced by local anthropogenic and biogenic emissions as well marine air masses from South China Sea aged transported highly polluted East Asian regions during winter monsoon season. An atmospheric observation tower has been constructed this coastline at Bachok Marine Research Station. Daily PM2.5 samples were collected top over a 3-week period, ion chromatography was used to make time-resolved measurements major ions...
The 2008–current summit eruption at Kīlauea Volcano, Hawai'i offers a unique opportunity to test models of degassing and magma plumbing improve our understanding the volatile budget. aim this work was hypothesis that gases emitted from lava lake will be rich in carbon dioxide (CO2) similar those measured during persistent activity early 20th century Volcano (Gerlach Graeber, 1985). We sulfur (SO2) CO2 concentrations gas plume Halema'uma'u using electrochemical non-dispersive infrared sensors...
In September and October 2015, Equatorial Asia experienced the most intense biomass burning episodes over past two decades. These events, mostly enhanced by extremely dry weather associated with occurrence of strong El Niño conditions, resulted in transnational transport hazardous pollutants from originating sources Indonesian Borneo Sumatra to highly populated Malaysian Peninsula. Quantifying population exposure form this event is a major challenge, only model-based studies have been...
Abstract. Atmospheric concentrations of very short-lived species (VSLS) bromocarbons, including CHBr3, CH2Br2, CHCl2Br, CHClBr2, and CH2BrCl, were measured in the Strait Malacca South China Sulu–Sulawesi seas during a two-month research cruise June–July 2009. The highest bromocarbon found Malacca, with smaller enhancements coastal regions northern Borneo. CHBr3 was most abundant bromocarbon, ranging from 5.2 pmol mol−1 to 0.94 over open ocean. Other bromocarbons showed lower concentrations,...
Atmospheric pollution of particulate matter (PM) is a major concern for its deleterious effects on human health and climate. Over the past 50 years, Equatorial Asia has experienced significant land-use change urbanization, which have contributed to more intense frequent extreme PM concentrations associated with increased anthropogenic wildfire emissions. Recent advances in remote sensing instrumentation retrieval protocols enabled effective monitoring from space near real time almost global...
In this study, we demonstrate the feasibility of using miniaturised optical particle counters (OPCs) for understanding AQ in Sub-Saharan Africa. Specifically, potential use OPCs high-density ground-based air pollution networks and derived data quantification atmospheric emissions were investigated. Correlation trend analysis particulate matters (PM), including PM10, PM2.5 PM1 undertaken on hourly basis alongside modelled meteorological parameters. Hourly averaged PM values 500 μg/m3, 90...
This paper describes the development and deployment of a lightweight in situ near-infrared tunable diode laser absorption spectrometer (TDLAS) for balloon-borne measurements trace species such as methane upper troposphere stratosphere. The key feature instrument design is its ability to provide high sensitivity with better than 1 part 10(6) Hz(-1/2) optical package weighing little 6 kg, maintaining this level performance over wide range conditions experienced during field measurements....
Correlation interferometry is a particular application of Fourier transform spectroscopy with partially scanned interferograms. Basically, it technique to obtain the difference between spectra atmospheric radiance at two diverse spectral resolutions. Although could be exploited design an appropriate correlation interferometer, in this paper we are concerned analytical aspects method and its high-spectral-resolution infrared observations order separate emission given gas from signal dominated...