Author
Helen ApSimon
Other affiliations: Royal School of Mines
Bio: Helen ApSimon is an academic researcher from Imperial College London. The author has contributed to research in topics: Integrated assessment modelling & Air quality index. The author has an hindex of 31, co-authored 93 publications receiving 2893 citations. Previous affiliations of Helen ApSimon include Royal School of Mines.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, a detailed emissions inventory of NH3 for the U.K. is described together with seasonal trends and the complexity of the cycle of the remaining NH3 through the atmosphere and circumstances in which it may lead to enhanced deposition of S are described and illustrated.
301 citations
TL;DR: Action is required to mitigate the public health risk created by excessive NOx emissions from modern diesel vehicles and discrimination of vehicles on the basis of Euro standard is arbitrary and incentives should promote vehicles with the lowest real-world emissions of both NOx and CO2.
146 citations
TL;DR: It is described how recent amendments to the GP reflect improved scientific knowledge on pollution, environmental relations, and links between regional air pollution and global climate change.
Abstract: The Convention on Long-Range Transboundary Air Pollution (CLRTAP) under the United Nations Economic Commission for Europe (UNECE) was established in 1979 to control damage to ecosystems and cultural heritage from acid rain, initially in Europe ( 1 ). Extended by eight protocols, most recently the Gothenburg Protocol (GP) signed in 1999, it has been key for developing cross-border air pollution control strategies over the UNECE region, which includes the United States and Canada. We describe how recent amendments to the GP reflect improved scientific knowledge on pollution, environmental relations, and links between regional air pollution and global climate change.
141 citations
TL;DR: In this paper, a microscale model MIMO, designed to take into account pollution dispersion in the vicinity of buildings, is validated against a two-dimensional wind-tunnel experiment for a square and a deep canyon (W/H=1) configuration.
140 citations
TL;DR: The Second Sulphur Protocol signed in Oslo in 1994, which took into account maps of critical loads as those levels of annual deposition which are deemed sustainable without adverse effects as mentioned in this paper.
136 citations
Cited by
More filters
Journal Article•
TL;DR: In this article, the authors present a document, redatto, voted and pubblicato by the Ipcc -Comitato intergovernativo sui cambiamenti climatici - illustra la sintesi delle ricerche svolte su questo tema rilevante.
Abstract: Cause, conseguenze e strategie di mitigazione Proponiamo il primo di una serie di articoli in cui affronteremo l’attuale problema dei mutamenti climatici. Presentiamo il documento redatto, votato e pubblicato dall’Ipcc - Comitato intergovernativo sui cambiamenti climatici - che illustra la sintesi delle ricerche svolte su questo tema rilevante.
4,187 citations
2,261 citations
TL;DR: In this article, the authors discuss the analysis of the extremes of data by modelling the sizes and occurrence of exceedances over high thresholds, and the natural distribution for such exceedances, the generalized Pareto distribution, is described and its properties elucidated.
Abstract: We discuss the analysis of the extremes of data by modelling the sizes and occurrence of exceedances over high thresholds. The natural distribution for such exceedances, the generalized Pareto distribution, is described and its properties elucidated. Estimation and model-checking procedures for univariate and regression data are developed, and the influence of and information contained in the most extreme observations in a sample are studied. Models for seasonality and serial dependence in the point process of exceedances are described. Sets of data on river flows and wave heights are discussed, and an application to the siting of nuclear installations is described
1,503 citations
01 Jan 2002
1,503 citations
TL;DR: In this article, the authors discuss N dynamics in soil plant systems, and outline management options for enhancing N use by annual crops, including livestock production with cropping, to improve N efficiency in agriculture.
Abstract: Nitrogen is the most limiting nutrient for crop production in many of the world's agricultural areas and its efficient use is important for the economic sustainability of cropping systems Furthermore, the dynamic nature of N and its propensity for loss from soil‐plant systems creates a unique and challenging environment for its efficient management Crop response to applied N and use efficiency are important criteria for evaluating crop N requirements for maximum economic yield Recovery of N in crop plants is usually less than 50% worldwide Low recovery of N in annual crop is associated with its loss by volatilization, leaching, surface runoff, denitrification, and plant canopy Low recovery of N is not only responsible for higher cost of crop production, but also for environmental pollution Hence, improving N use efficiency (NUE) is desirable to improve crop yields, reducing cost of production, and maintaining environmental quality To improve N efficiency in agriculture, integrated N management strategies that take into consideration improved fertilizer along with soil and crop management practices are necessary Including livestock production with cropping offers one of the best opportunities to improve NUE Synchrony of N supply with crop demand is essential in order to ensure adequate quantity of uptake and utilization and optimum yield This paper discusses N dynamics in soil‐plant systems, and outlines management options for enhancing N use by annual crops
1,083 citations