Browsing University of Hertfordshire by Author "Chemel, Charles"

Now showing items 1-8 of 8

    • Design and field campaign validation of a multi-rotor unmanned aerial vehicle and optical particle counter 

      Girdwood, Joseph; Smith, Helen R.; Stanley, Warren; Ulanowski, Joseph; Stopford, Chris; Chemel, Charles; Doulgeris, Konstantinos-Matthaios; Brus, David; Campbell, David; Mackenzie, Robert (2020-12-07)
      Small unmanned aircraft (SUA) have the potential to be used as platforms for the measurement of atmospheric particulates. The use of an SUA platform for these measurements provides benefits such as high manoeuvrability, ...

    • Design and field campaign validation of a multi-rotor unmanned aerial vehicle and optical particle counter 

      Girdwood, Joseph; Smith, Helen R.; Stanley, Warren; Ulanowski, Joseph; Stopford, Chris; Chemel, Charles; Doulgeris, Konstantinos-Matthaios; Brus, David; Campbell, David; Mackenzie, Robert (2020-12-07)
      Small unmanned aircraft (SUA) have the potential to be used as platforms for the measurement of atmospheric particulates. The use of an SUA platform for these measurements provides benefits such as high manoeuvrability, ...

    • Dispersion of tracers in the stable atmosphere of a valley opening onto a plain 

      Quimbayo-Duarte, Julian; Staquet, Chantal; Chemel, Charles; Arduini, Gabriele (2019-08-01)
      We quantify the impact of a valley-wind system on the transport of passive tracers in the stably-stratified atmosphere of a valley dynamically decoupled from the atmosphere above. The simple configuration of an idealized ...

    • Drivers of severe air pollution events in a deep valley during wintertime: a case study from the Arve river valley, France 

      Quimbayo-Duarte, Julian; Chemel, Charles; Staquet, Chantal; Troude, Florence; Arduini, Gabriele (2021-02-15)
      The Arve river valley airshed in the French Alps experiences particularly severe air pollution during wintertime stable atmospheric conditions associated with persistent cold-air pools. PM10 data recorded in the region ...

    • Energetics of Deep Alpine Valleys in Pooling and Draining Configurations 

      Arduini, G.; Chemel, Charles; Staquet, C. (2017-07-01)
      The Weather Research and Forecast numerical model is used to investigate the nocturnal atmospheric boundary layer in a valley that opens either on a wider valley (draining configuration) or on a narrower valley (pooling ...

    • Impact of along-valley orographic variations on the dispersion of passive tracers in a stable atmosphere 

      Quimbayo-Duarte, Julian; Staquet, Chantal; Chemel, Charles; Arduini, Gabriele (2019-04-25)
      A numerical model is used to investigate the transport of passive tracers in an idealized Alpine valley during stable wintertime conditions after the evening transition. The valley is composed of an upstream-valley section, ...

    • Insights into the deterministic skill of air quality ensembles from the analysis of AQMEII data 

      Kioutsioukis, I.; Im, U.; Solazzo, E.; Bianconi, R.; Badia, A.; Balzarini, A.; Baró, R.; Bellasio, R.; Brunner, D.; Chemel, Charles; Curci, G.; Denier van der Gon, H.; Flemming, J.; Forkel, R.; Giordano, L.; Jiménez-Guerrero, P.; Hirtl, M.; Jorba, O.; Manders-Groot, A.; Neal, L.; Pérez, J. L.; Pirovano, G.; San Jose, R.; Savage, N.; Schroder, W.; Sokhi, Ranjeet; Syrakov, D.; Tuccella, P.; Werhahn, J.; Wolke, R.; Hogrefe, C.; Galmarini, S. (2016-12-20)
      Simulations from chemical weather models are subject to uncertainties in the input data (e.g. emission inventory, initial and boundary conditions) as well as those intrinsic to the model (e.g. physical parameterization, ...

    • Interactions between the night time valley-wind system and a developing cold-air pool 

      Arduini, Gabriele; Staquet, C.; Chemel, Charles (2016-10-01)
      The Weather Research and Forecast (WRF) numerical model is used to characterize the influence of a thermally-driven down-valley flow on a developing cold-air pool in an idealized alpine valley decoupled from the atmosphere ...