A5049955015- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Vehicle emissions and performance
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Plant responses to elevated CO2
- Marine and coastal ecosystems
- Fire effects on ecosystems
- scientometrics and bibliometrics research
- Ocean Acidification Effects and Responses
- Odor and Emission Control Technologies
- Climate Change and Health Impacts
- European Criminal Justice and Data Protection
- Arctic and Antarctic ice dynamics
- Law and Political Science
- Spectroscopy and Laser Applications
- German Literature and Culture Studies
- Urban Transport and Accessibility
- Populism, Right-Wing Movements
- Advanced Aircraft Design and Technologies
- Medical and Health Sciences Research
- Corporate Governance and Management
- Social and Intergroup Psychology
University of York
2014-2025
National Centre for Atmospheric Science
2012-2025
University of Zurich
2020-2023
Literaturarchiv
2023
Forschungsverbund Berlin
2023
University of Reading
2022
University of Surrey
2022
Office of the Principal Scientific Adviser
2022
Language Science (South Korea)
2022
University of Aberdeen
2016
Abstract. The lifetime of methane is controlled to a very large extent by the abundance OH radical. tropics are key region for removal, with oxidation in lower tropical troposphere dominating global removal budget (Bloss et al., 2005). In forested environments where biogenic VOC emissions high and NOx concentrations low, assumed be low due rapid reactions sink species such as isoprene. New, simultaneous measurements reactivity, k'OH, Borneo rainforest reported show much higher than...
Low cost pollution sensors have been widely publicized, in principle offering increased information on the distribution of air and a democratization quality measurements to amateur users. We report laboratory study commonly-used electrochemical quantify number cross-interferences with other atmospheric chemicals, some which become significant at typical suburban concentrations. highlight that artefact signals from co-sampled pollutants such as CO2 can be greater than sensor signal generated...
More than half the world's rainforest has been lost to agriculture since Industrial Revolution. Among most widespread tropical crops is oil palm (Elaeis guineensis): global production now exceeds 35 million tonnes per year. In Malaysia, for example, 13% of land area plantation, compared with 1% in 1974. There are enormous pressures increase food, domestic products, and, especially, biofuels. Greater use biofuel predicated on assumption that an "environmentally friendly" fuel feedstock. Here...
Abstract. In April–July 2008, intensive measurements were made of atmospheric composition and chemistry in Sabah, Malaysia, as part the "Oxidant particle photochemical processes above a South-East Asian tropical rainforest" (OP3) project. Fluxes concentrations trace gases particles from rainforest canopy at Bukit Atur Global Atmosphere Watch station nearby Sabahmas oil palm plantation, using both ground-based airborne measurements. Here, measurement modelling strategies used, characteristics...
Abstract. Atmospheric composition and chemistry above tropical rainforests is currently not well established, particularly for south-east Asia. In order to examine our understanding of chemical processes in this region, the performance a box model atmospheric boundary layer tested against measurements made at top rainforest canopy near Danum Valley, Malaysian Borneo. Multi-variate optimisation ambient concentration was used estimate average canopy-scale emissions isoprene, total monoterpenes...
A highly sensitive chemiluminescence instrument has been deployed to measure nitric oxide (NO) and nitrogen dioxide (NO 2 ) at the Cape Verde Atmospheric Observatory in remote tropical North Atlantic marine boundary layer (MBL). Using two different methods, was assessed have a detection limit of around 1.8 parts per trillion by volume (pptv) for NO 5.5 pptv hour‐long integration periods. The overall accuracy estimated ∼18% 30% . Measurements NO, , ozone (O 3 over period 12 months 2007 show...
Abstract. OH (hydroxyl radical) reactivity, the inverse of chemical lifetime hydroxyl radical, was measured for 12 days in April 2008 within a tropical rainforest on Borneo as part OP3 (Oxidant and Particle Photochemical Processes) project. The maximum observed value 83.8 ± 26.0 s−1 with campaign averaged noontime being 29.1 8.5 s−1. reactivity calculated using diurnally concentrations sinks ~ 18 s−1, significantly less than observations, consistent other studies similar environments....
Although it has recently been established that iodine plays an important role in the atmospheric chemistry of coastal Antarctica, where occurs at levels which cause significant ozone (O 3 ) depletion and changes oxidising capacity, oxides have not previously observed conclusively Arctic boundary layer (BL). This paper describes differential optical absorption spectroscopy (DOAS) observations monoxide (IO), along with gas chromatographic measurements iodocarbons, sub‐Arctic environment...
Abstract. We present an analysis of ozone (O3) photochemistry observed by aircraft measurements boreal biomass burning plumes over eastern Canada in the summer 2011. Measurements O3 and a number key chemical species associated with photochemistry, including non-methane hydrocarbons (NMHCs), nitrogen oxides (NOx) total containing (NOy), were made from UK FAAM BAe-146 research as part "quantifying impact BOReal forest fires on Tropospheric oxidants Atlantic using Aircraft Satellites" (BORTAS)...
Abstract. Airborne measurements of biomass burning organic aerosol (BBOA) from boreal forest fires reveal highly contrasting properties for plumes different ages. These measurements, performed using an Aerodyne Research Inc. compact time-of-flight mass spectrometer (C-ToF-AMS) during the BORTAS (quantifying impact BOReal on Tropospheric oxidants over Atlantic Aircraft and Satellites) experiment in summer 2011, have been used to derive normalised excess (OA) concentrations (ΔOA / ΔCO), with...
Abstract. Forests fires are a significant source of chemicals to the atmosphere including numerous non-methane organic compounds (NMOCs). We report airborne measurement hydrocarbons, acetone and methanol from >500 whole air samples collected over Eastern Canada, interceptions several different boreal biomass burning plumes. From these concurrent measurements carbon monoxide (CO) we derive fire emission ratios for 29 species relative CO. These range 8.9 ± 3.2 ppt ppb−1 CO 0.007 0.004...
Abstract. The NERC UK SOLAS-funded Reactive Halogens in the Marine Boundary Layer (RHaMBLe) programme comprised three field experiments. This manuscript presents an overview of measurements made within two simultaneous remote experiments conducted tropical North Atlantic May and June 2007. Measurements were from mobile one ground-based platforms. heavily instrumented cruise D319 on RRS Discovery Lisbon, Portugal to São Vicente, Cape Verde back Falmouth, was used characterise spatial...
Abstract. Field measurements of the hydroxyl radical, OH, are crucial for our understanding tropospheric chemistry. However, observations this key atmospheric species in tropical marine boundary layer, where warm, humid conditions and high solar irradiance lend themselves favourably to production, sparse. The Seasonal Oxidant Study at Cape Verde Atmospheric Observatory 2009 allowed, first time, seasonal both OH HO2 a clean (i.e. low NOx), environment. It was found that concentrations were...
Abstract. We describe the design and execution of BORTAS (Quantifying impact BOReal forest fires on Tropospheric oxidants over Atlantic using Aircraft Satellites) experiment, which has overarching objective understanding chemical aging air masses that contain emission products from seasonal boreal wildfires how these subsequently downwind atmospheric composition. The central focus experiment was a two-week deployment UK BAe-146-301 Atmospheric Research (ARA) eastern Canada, based out...
In a drive to achieve net zero emissions, U.K. transport decarbonisation policies are predominantly focussed on measures promote the uptake and use of electric vehicles (EVs). This is reflected in COP26 Transport Declaration signed by 38 national governments, alongside city region vehicle manufacturers investors. However, emerging evidence suggests that EVs present multiple challenges for air quality, mobility health, including risks from non-exhaust emissions (NEEs) increasing reliance...
Direct measurements of NOx concentration and flux were made from a tall tower in central London, UK as part the Clean Air for London (ClearfLo) project. Fast time resolution (10 Hz) NO NO2 concentrations measured combined with fast vertical wind to provide top-down estimates using eddy covariance technique. Measured fluxes usually positive ranged close zero at night 2000–8000 ng m–2 s–1 during day. Peak observed morning, coincident maximum traffic flow. Measurements have been scaled compared...
Abstract. The chemistry of the halogen species bromine and iodine has a range impacts on tropospheric composition, can affect oxidising capacity in number ways. However, recent studies disagree overall sign halogens troposphere. We present simulations OH HO2 radicals for comparison with observations made remote tropical ocean boundary layer during Seasonal Oxidant Study at Cape Verde Atmospheric Observatory 2009. use both constrained box model, using detailed derived from Master Chemical...
Carbon monoxide and nonmethane volatile organic compounds (NMVOC) have been measured for the first time on a continuous basis in tropical marine boundary layer of Atlantic Ocean. CO ethane, which similar lifetimes with respect to OH degradation, vary intra‐annually sinusoidal variability expected due primary hydroxyl radical (OH) sink, but showing smaller cycle amplitude. The ethane measurements were used derive seasonal variation nominal concentration (n[OH]) experienced along air mass...
Abstract. A four-channel thermal dissociation laser induced fluorescence (TD-LIF) instrument has been developed for simultaneous measurements of nitrogen dioxide (NO2), total peroxy nitrate (∑PNs), alkyl (∑ANs) and nitric acid (HNO3). NO2 is measured directly by LIF at 532 nm, whereas organic nitrates are thermally dissociated distinct temperatures in the inlet to form NO2, which then LIF. The concentrations each species derived differences relative reference colder channel. TD-LIF was...
Trend analysis of air pollutant concentrations becomes problematic when applied to data from quality monitoring networks containing time series differing lengths. The average trend such can be misleading due biases in the network. For example, if new sites located more polluted locations are added a network, introduction these leverage upwards. A method for resolving this problem was developed, using rolling window regression recursively calculate change concentration as function time, which...
Abstract. A cross-platform field campaign, OP3, was conducted in the state of Sabah Malaysian Borneo between April and July 2008. Among suite observations recorded, campaign included measurements NOx O3 – crucial outputs any model chemistry mechanism. We describe these species made from both ground site aircraft. then use output two resolutions transport p-TOMCAT to illustrate ability a global chemical mechanism capture at rainforest site. The basic performance is good for poor ozone. box...