- UHRA Home
- Browsing by Author
Browsing by Author "Centre for Atmospheric and Climate Physics Research"
Now showing items 21-40 of 432
-
The applicability of physical optics in the millimetre and sub-millimetre spectral region. : Part I: The ray tracing with diffraction on facets method
Baran, Anthony; Hesse, Evelyn; Sourdeval, Odran (2017-03-01)Future satellite missions, from 2022 onwards, will obtain near-global measurements of cirrus at microwave and sub-millimetre frequencies. To realise the potential of these observations, fast and accurate light-scattering ... -
The applicability of physical optics in the millimetre and sub-millimetre spectral region. Part II: Application to a three-component model of ice cloud and its evaluation against the bulk single-scattering properties of various other aggregate models
Baran, Anthony; Ishimoto, Hiroshi; Sourdeval, Odran; Hesse, Evelyn; Harlow, Chawn (2018-02-28)The bulk single-scattering properties of various randomly oriented aggregate ice crystal models are com- pared and contrasted at a number of frequencies between 89 and 874 GHz. The model ice particles consist of the ... -
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 ... -
Application of RTDF to particles with curved surfaces
Hesse, E.; McCall, D.; Ulanowski, Z.; Stopford, C.; Kaye, Paul H. (2009)The applicability of the ray tracing with diffraction on facets model is extended to particles with curved surfaces. This allows tests against T-matrix calculations for larger size parameters and modelling of light scattering ... -
Application of RTDF to particles with curved surfaces
Hesse, E.; McCall, D.; Ulanowski, Z.; Stopford, C.; Kaye, Paul H. (University of Hertfordshire, 2008)The applicability of RTDF is extended to particles with curved surfaces. This allows tests against T-matrix calculations for larger size parameter and modeling of light scattering by more realistic particle shapes, such ... -
Applying machine learning methods for characterization of hexagonal prisms from their 2D scattering patterns – an investigation using modelled scattering data
Salawu, Emmanuel Oluwatobi; Hesse, Evelyn; Stopford, Chris; Davey, Neil; Sun, Yi (2017-11-01)Better understanding and characterization of cloud particles, whose properties and distributions affect climate and weather, are essential for the understanding of present climate and climate change. Since imaging cloud ... -
An approach to predict population exposure to ambient air PM2.5 concentrations and its dependence on population activity for the megacity London
Singh, Vikas; Sokhi, Ranjeet; Kukkonen, Jaakko (2020-02-01)A comprehensive modelling approach has been developed to predict population exposure to the ambient air PM2.5 concentrations in different microenvironments in London. The modelling approach integrates air pollution dispersion ... -
Arctic haze over Central Europe
Heintzenberg, J.; Tuch, T.; Wehner, B.; Wiedensohler, A.; Wex, H.; Ansmann, A.; Mattis, I.; Mueller, D.; Wendisch, M.; Eckhardt, S.; Stohl, A. (2003-07)An extraordinary aerosol situation over Leipzig, Germany in April 2002 was investigated with a comprehensive set of ground-based volumetric and columnar aerosol data, combined with aerosol profiles from lidar, meteorological ... -
Arrange and average algorithm for the retrieval of aerosol parameters from multiwavelength high-spectral-resolution lidar/Raman lidar data
Chemyakin, Eduard V.; Mueller, D.; Burton, Sharon P.; Kolgotin, Alexei V.; Hostetler, Chris A.; Ferrare, Richard A. (2014-10-23)We present the results of a feasibility study in which a simple, automated, and unsupervised algorithm, which we call the arrange and average algorithm, is used to infer microphysical parameters (complex refractive index, ... -
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 ... -
Assessment of the sensitivity of model responses to urban emission changes in support of emission reduction strategies
Bessagnet, Bertrand; Cuvelier, Kees; de Meij, Alexander; Monteiro, Alexandra; Pisoni, Enrico; Thunis, Philippe; Violaris, Angelos; Kushta, Jonilda; Denby, Bruce R.; Mu, Qing; Wærsted, Eivind G.; Vivanco, Marta G.; Theobald, Mark R.; Gil, Victoria; Sokhi, Ranjeet; Momoh, John-Kester; Alyuz Ozdemir, Ummugulsum; VPM, Rajasree; Kumar, Saurabh; Bossioli, Elissavet; Methymaki, Georgia; Brzoja, Darijo; Milić, Velimir; Cholakian, Arineh; Pennel, Romain; Mailler, Sylvain; Menut, Laurent; Briganti, Gino; Mircea, Mihaela; Flandorfer, Claudia; Baumann-Stanzer, Kathrin; Hutsemékers, Virginie; Trimpeneers, Elke (2023-12-26)The sensitivity of air quality model responses to modifications in input data (e.g. emissions, meteorology and boundary conditions) or model configurations is recognized as an important issue for air quality modelling ... -
Atmospheric aerosol characterization combining multi-wavelength Raman Lidar and MAX-DOAS measurements in Gwanjgu
Chong, Jihyo; Shin, Dong Ho; Kim, Kwan Chul; Lee, Kwon-Ho; Shin, Sungkyun; Noh, Y. M.; Mueller, D.; Kim, Young J. (SPIE, 2011)Integrated approach has been adopted at the ADvanced Environmental Research Center (ADEMRC), Gwangju Institute of Science and Technology (GIST), Korea for effective monitoring of atmospheric aerosol. Various active and ... -
Atmospheric dust charging, vertical profiles, and optical properties measured in the Arabian Peninsula during the DREAME campaign
Ulanowski, Joseph; Sabbah, Ismail; Harrison, R.G.; Nicoll, K.A.; Hirst, Edwin; Kaye, Paul H.; Al-Abbadi, Naif; Rogers, George (2010)Polarimetric observations of atmospheric Saharan dust over the Canary Islands have provided strong evidence for the presence of vertically aligned particles. The alignment was thought to be due to the electric field present ... -
Atmospheric dust modeling from meso to global scales with the online NMMB/BSC-Dust model - Part 2 : Experimental campaigns in Northern Africa
Haustein, K.; Perez, C.; Baldasano, J. M.; Jorba, O.; Basart, S.; Miller, R. L.; Janjic, Z.; Black, T.; Nickovic, S.; Todd, M. C.; Washington, R.; Mueller, D.; Tesche, Matthias; Weinzierl, B.; Esselborn, M.; Schladitz, A. (2012)The new NMMB/BSC-Dust model is intended to provide short to medium-range weather and dust forecasts from regional to global scales. It is an online model in which the dust aerosol dynamics and physics are solved at each ... -
Atmospheric polycyclic aromatic hydrocarbons: Source attribution, emission factors and regulation
Ravindra, K.; Sokhi, R.S.; Van Grieken, R. (2008)There is an increasing concern about the occurrence of polycyclic aromatic hydrocarbons (PAHs) in the environment as they are ubiquitous in ambient air and some of them are among the strongest known carcinogens. PAHs and ... -
Automated, unsupervised inversion of multiwavelength lidar data with TiARA : Assessment of retrieval performance of microphysical parameters using simulated data
Mueller, Detlef; Chemyakin, Eduard V.; Kolgotin, Alexei V.; Ferrare, Richard A.; Hostetler, Chris A.; Romanov, A. (2019-06-18)We evaluate the retrieval performance of the automated, unsupervised inversion algorithm, Tikhonov Advanced Regularization Algorithm (TiARA), which is used for the autonomous retrieval of microphysical parameters of ... -
Avoiding high ozone pollution in Delhi, India
Chen, Ying; Beig, Gufran; Archer-Nicholls, Scott; Drysdale, Will; Acton, Joe; Lowe, Doug; Nelson, Beth S; Lee, James D; Ran, Liang; Wang, Yu; Wu, Zhijun; Sahu, Saroj Kumar; Sokhi, Ranjeet S; Singh, Vikas; Gadi, Ranu; Hewitt, C. N.; Nemitz, Eiko; Archibald, Alex; McFiggins, Gordon; Wild, Oliver (2020-08-06)Surface ozone is a major pollutant threatening public health, agricultural production and natural ecosystems. While measures to improve air quality in megacities such as Delhi are typically aimed at reducing levels of ... -
BASIS: Bayfordbury single-object integral field spectrograph
Richards, S.; Martin, Bill; Campbell, D.; Jones, H.R.A.; Bland-Hawthorn, J.; Lawrence, J.; Brinks, E.; Bryant, J.J.; Fogarty, L.; Gallaway, M.; Goodwin, M.; Leon-Saval, S.; Sarzi, M.; Smith, Daniel (SPIE, 2012-09)We present an inexpensive (<US$500) and easily replicable integral field unit for use on small aperture telescopes. Based on a commercial small spectrograph (SBIG Self-Guiding Spectrograph) and a 37 optical fibre bundle ... -
Beam tracing with diffraction
Taylor, Laurence; Hesse, Evelyn; Ulanowski, Z.; Kaye, Paul H.; Penttila, Antti; Nousiainen, Timo (2015-06-21) -
Bright and dark helices of light
Steuernagel, Ole (2012)Laser beams can be made to form bright and dark intensity helices of light. Such helices have a pitch length on the order of a wavelength and may have applications in lithography and the manipulation of particles through ...