Browsing University of Hertfordshire by Author "Chemel, C."

Now showing items 1-20 of 44

    • Analysis of meteorology-chemistry interactions during air pollution episodes using online coupled models within AQMEII Phase-2 

      Kong, Xin; Forkel, Renate; Sokhi, Ranjeet; Suppan, Peter; Baklanov, Alexander; Gauss, Michael; Brunner, Dominik; Barò, Rocìo; Balzarini, Alessandra; Chemel, C.; Curci, Gabriele; Jiménez-Guerrero, Pedro; Hirtl, Marcus; Honzakj, Luka; Im, Ulas; Pérez, Juan; Pirovano, Guido; San Jose, Roberto; Schlünzenm, Heinke; Tsegas, George; Tuccella, Paolo; Werhahn, Johannes; Žabkar, Rahela; Galmarini, Stefano (2015-08)
      This study reviews the top ranked meteorology and chemistry interactions in online coupled models recommended by an experts’ survey conducted in COST Action EuMetChem and examines the sensitivity of those interactions ...

    • Analysis of UK and European NOx and VOC emission scenarios in the Defra model intercomparison exercise 

      Derwent, Richard; Beevers, Sean; Chemel, C.; Cooke, Sally; Vazhappilly Francis, Xavier; Fraser, Andrea; Heal, Mathew R.; Kitwiroon, Nutthida; Lingard, Justin; Redington, Alison; Sokhi, Ranjeet; Vieno, Massimo (2014-09)
      Simple emission scenarios have been implemented in eight United Kingdom air quality models with the aim of assessing how these models compared when addressing whether photochemical ozone formation in southern England was ...

    • Application of chemical transport model CMAQ to policy decisions regarding PM2.5 in the UK 

      Chemel, C.; Fisher, B.E.A.; Kong, X.; Vazhappilly Francis, Xavier; Sokhi, R.S.; Good, N.; Collins, W.J.; Folberth, G.A. (2014-01-01)
      This paper shows how the advanced chemical transport model CMAQ can be used to estimate future levels of PM2.5 in the UK, the key air pollutant in terms of human health effects, but one which is largely made up from the ...

    • Assessment of 2010 air quality in two Alpine valleys from modelling: Weather type and emission scenarios 

      Brulfert, G.; Chemel, C.; Chaxel, E.; Chollet, J.P.; Jouve, B.; Villard, H. (2006)
      Alpine valleys are sensitive to anthropogenic emissions. Local atmospheric dynamics are a key factor that may lead to an accumulation of pollutants in the bottom of the Chamonix and Maurienne valleys. Assessment of 2010 ...

    • Assessment of the MACC reanalysis and its influence as chemical boundary conditions for regional air quality modeling in AQMEII-2 

      Giordano, L.; Brunner, D.; Flemming, J.; Hogrefe, C.; Im, U.; Bianconi, R.; Badia, A.; Balzarini, A.; Baro, R.; Chemel, C.; Curci, G.; Forkel, R.; Jimenez-Guerrero, P.; Hirtl, M.; Hodzic, A.; Honzak, L.; Jorba, O.; Knote, C.; Kuenen, J.J.P.; Makar, P.A.; Manders-Groot, A.; Neal, L.; Perez, J.L.; Pirovano, G.; Pouliot, G.; San Jose, R.; Savage, N.; Schroder, W.; Sokhi, R.S.; Syrakov, D.; Torian, A.; Tuccella, P.; Werhahn, J.; Wolke, R.; Yahya, K.; Žabkar, R.; Zhang, Y.; Galmarini, S. (2015-08)
      The Air Quality Model Evaluation International Initiative (AQMEII) has now reached its second phase which is dedicated to the evaluation of online coupled chemistry-meteorology models. Sixteen modelling groups from Europe ...

    • Can aerosols influence deep tropical convection? : Aerosol indirect effects in the Hector island thunderstorm 

      Connolly, P.J.; Vaughan, G.; May, P.T.; Chemel, C.; Allen, G.; Choularton, T.W.; Gallagher, M.W.; Bower, K.N.; Crosier, J.; Dearden, C. (2013-10)
      This article addresses the effects of cloud condensation nuclei on the evolution of an intense tropical convective system, known as Hector, using data taken from the ACTIVE and TWP-ICE field campaigns, which were conducted ...

    • Characterization of oscillatory motions in the stable atmosphere of a deep valley 

      Largeron, Yann; Staquet, Chantal; Chemel, C. (2013-09)
      In a valley sheltered from strong synoptic effects, the dynamics of the valley atmosphere at night is dominated by katabatic winds. In a stably stratified atmosphere, these winds undergo temporal oscillations, whose frequency ...

    • Co-ordinated Airborne Studies in the Tropics (CAST) 

      Harris, N. R. P.; Carpenter, L. J.; Lee, J. D.; Vaughan, G.; Filus, M. T.; Jones, R. L.; OuYang, B.; Pyle, J. A.; Robinson, A. D.; Andrews, S. J.; Lewis, A. C.; Minaeian, J.; Vaughan, A.; Dorsey, J. R.; Gallagher, M. W.; Le Breton, M.; Newton, R.; Percival, C. J.; Ricketts, H. M. A.; Baugitte, S. J-B.; Nott, G. J.; Wellpott, A.; Ashfold, M. J.; Flemming, J.; Butler, R.; Palmer, P. I.; Kaye, P. H.; Stopford, C.; Chemel, C.; Boesch, H.; Humpage, N.; Vick, A.; MacKenzie, A. R.; Hyde, R.; Angelov, P.; Meneguz, E.; Manning, A. J. (2017-01-23)
      The main field activities of the CAST (Co-ordinated Airborne Studies in the Tropics) campaign took place in the West Pacific in January/February 2014. The field campaign was based in Guam (13.5°N, 144.8°E) using the UK ...

    • Comparative analysis of meteorological performance of coupled chemistry-meteorology models in the context of AQMEII phase 2 

      Brunner, Dominik W.; Savage, Nick H.; Jorba, Oriol; Eder, Brian K.; Giordano, Lea; Badia, Alba; Balzarini, Alessandra; Baró, Rocío; Bianconi, Roberto; Chemel, C.; Curci, Gabriele; Forkel, Renate; Jiménez-Guerrero, Pedro; Hirtl, Marcus; Hodzic, Alma; Honzak, Luka; Im, Ulas; Knote, Christoph; Makar, Paul A.; Manders-Groot, Astrid; Van Meijgaard, Erik; Neal, Lucy S.; Pérez, Juan Luis Canovas; Pirovano, Guido; San José, Roberto; Schro¨der, Wolfram; Sokhi, R.S.; Syrakov, Dimiter E.; Torian, Alfreida; Tuccella, Paolo; Werhahn, Johannes; Wolke, Ralf; Yahya, Khairunnisa; Žabkar, Rahela; Zhang, Yang; Hogrefe, Christian; Galmarini, Stefano (2015-08)
      Air pollution simulations critically depend on the quality of the underlying meteorology. In phase 2 of the Air Quality Model Evaluation International Initiative (AQMEII-2), thirteen modeling groups from Europe and four ...

    • Estimating the diffusive heat flux across a stable interface forced by convective motions 

      Chemel, C.; Staquet, C.; Chollet, J.P. (2010)
      Entrainment at the top of the convectively-driven boundary layer (CBL) is revisited using data from a high-resolution large-eddy simulation (LES). In the range of values of the bulk Richardson number RiB studied here (about ...

    • Evaluating the capability of regional-scale air quality models to capture the vertical distribution of pollutants 

      Solazzo, E.; Bianconi, R.; Pirovano, G.; Moran, M. D.; Vautard, R.; Hogrefe, C.; Appel, K. W.; Matthias, V.; Grossi, P.; Bessagnet, B.; Brandt, J.; Chemel, C.; Christensen, J. H.; Forkel, R.; Vazhappilly Francis, Xavier; Hansen, A. B.; McKeen, S.; Nopmongcol, U.; Prank, M.; Sartelet, K. N.; Segers, A.; Silver, J. D.; Yarwood, G.; Werhahn, J.; Zhang, J.; Rao, S. T.; Galmarini, S. (2013)
      This study is conducted in the framework of the Air Quality Modelling Evaluation International Initiative (AQMEII) and aims at the operational evaluation of an ensemble of 12 regional-scale chemical transport models used ...

    • Evaluation of a CMAQ simulation at high resolution over the UK for the calendar year 2003 

      Chemel, C.; Sokhi, R.S.; Yu, Y.; Hayman, G.D.; Vincent, K.J.; Dore, A.J.; Tang, Y.S.; Prain, H.D.; Fisher, B. (2010)
      A comprehensive ‘operational’ evaluation of the performance of the Community Multiscale Air Quality (CMAQ) modelling system version 4.6 was conducted in support of pollution assessment in the UK for the calendar year 2003. ...

    • Evaluation of operational on-line-coupled regional air quality models over Europe and North America in the context of AQMEII phase 2 : Part I: Ozone 

      Im, Ulas; Bianconi, Roberto; Solazzo, Efisio; Kioutsioukis, Ioannis; Badia, Alba; Balzarini, Alessandra; Baró, Rocío; Bellasio, Roberto; Brunner, Dominik; Chemel, C.; Curci, Gabriele; Flemming, Johannes; Forkel, Renate; Giordano, Lea; Jiménez-Guerrero, Pedro; Hirtl, Marcus; Hodzic, Alma; Honzak, Luka; Jorba, Oriol; Knote, Christoph; Kuenen, Jeroen J.P.; Makar, Paul A.; Manders-Groot, Astrid; Neal, Lucy; Pérez, Juan L.; Pirovano, Guido; Pouliot, George; San Jose, Roberto; Savage, Nicholas; Schroder, Wolfram; Sokhi, Ranjeet S.; Syrakov, Dimiter; Torian, Alfreida; Tuccella, Paolo; Werhahn, Johannes; Wolke, Ralf; Yahya, Khairunnisa; Zabkar, Rahela; Zhang, Yang; Zhang, Junhua; Hogrefe, Christian; Galmarini, Stefano (2015-08)
      The second phase of the Air Quality Model Evaluation International Initiative (AQMEII) brought together sixteen modeling groups from Europe and North America, running eight operational online-coupled air quality models ...

    • Evaluation of operational online-coupled regional air quality models over Europe and North America in the context of AQMEII phase 2 : Part II: Particulate matter 

      Im, Ulas; Bianconi, Roberto; Solazzo, Efisio; Kioutsioukis, Ioannis; Badia, Alba; Balzarini, Alessandra; Baró, Rocío; Bellasio, Roberto; Brunner, Dominik; Chemel, C.; Curci, Gabriele; Denier van der Gon, Hugo; Flemming, Johannes; Forkel, Renate; Giordano, Lea; Jiménez-Guerrero, Pedro; Hirtl, Marcus; Hodzic, Alma; Honzak, Luka; Jorba, Oriol; Knote, Christoph; Makar, Paul A.; Manders-Groot, Astrid; Neal, Lucy; Pérez, Juan L.; Pirovano, Guido; Pouliot, George; San Jose, Roberto; Savage, Nicholas; Schroder, Wolfram; Sokhi, Ranjeet S.; Syrakov, Dimiter; Torian, Alfreida; Tuccella, Paolo; Wang, Kai; Werhahn, Johannes; Wolke, Ralf; Zabkar, Rahela; Zhang, Yang; Zhang, Junhua; Hogrefe, Christian; Galmarini, Stefano (2015-08)
      The second phase of the Air Quality Model Evaluation International Initiative (AQMEII) brought together seventeen modeling groups from Europe and North America, running eight operational online-coupled air quality models ...

    • Evaluation of the meteorological forcing used for the Air Quality Model Evaluation International Initiative (AQMEII) air quality simulations 

      Vautard, R.; Moran, M.D.; Solazzo, E.; Gilliam, R.C.; Matthias, V.; Bianconi, R.; Chemel, C.; Ferreira, J.; Geyer, B.; Hansen, A.B.; Jericevic, A.; Prank, M.; Segers, A.; Silver, J.D.; Werhahn, J.; Wolke, R.; Rao, S.T.; Galmarini, S. (2012)
      Accurate regional air pollution simulation relies strongly on the accuracy of the mesoscale meteorological simulation used to drive the air quality model. The framework of the Air Quality Model Evaluation International ...

    • Evaluation of the performance of different atmospheric chemical transport models and inter-comparison of nitrogen and sulphur deposition estimates for the UK 

      Dore, A.J.; Carslaw, D.C.; Braban, C.; Cain, M.; Chemel, C.; Conolly, C.; Derwent, R.G.; Griffiths, S.J.; Hall, J.; Hayman, G.; Lawrence, S.; Metcalfe, S.E.; Redington, A.; Simpson, D.; Sutton, M.A.; Sutton, P.; Tang, Y.S.; Vieno, M.; Werner, M.; Whyatt, J.D. (2015-10)
      An evaluation has been made of a number of contrasting atmospheric chemical transport models, of varying complexity, applied to estimate sulphur and nitrogen deposition in the UK. The models were evaluated by comparison ...

    • Evolution of cold-air-pooling processes in complex terrain 

      Burns, Paul; Chemel, C. (2014-03-01)
      Elucidating cold-air-pooling processes forms part of the longstanding problem of parametrizing the effects of complex terrain in larger-scale numerical models. The Weather Research and Forecasting model has been set-up and ...

    • Examination of the Community Multiscale Air Quality (CMAQ) model performance over the North American and European domains 

      Appel, K.W.; Chemel, C.; Roselle, S.J.; Vazhappilly Francis, Xavier; Hu, Rong-Ming; Sokhi, R.S.; Rao, S.T.; Galmarini, S. (2012)
      The CMAQ modeling system has been used to simulate the air quality for North America and Europe for the entire year of 2006 as part of the Air Quality Model Evaluation International Initiative (AQMEII). The operational ...

    • A formulation of convective entrainment in terms of mixing efficiency 

      Chemel, C.; Staquet, C. (2007)

    • Generation of internal gravity waves by a katabatic wind in an idealized alpine valley 

      Chemel, C.; Staquet, C.; Largeron, Y. (2009)
      The dynamics of the atmospheric boundary layer in an alpine valley at night or in winter is dominated by katabatic (or down-slope) flows. As predicted by McNider (1982) oscillations along the slope are expected to occur ...