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Browsing by Author "Centre for Atmospheric and Climate Physics Research"
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Focus on exposure to air pollution and related health impacts
Hänninen, O.; Vardoulakis, S.; Sarigiannis, D.A.; Incecik, S.; Sokhi, R.S. (2011-12-01)Outdoor and indoor air pollution was recently identified as a key contributor to the environmental burden of disease in European countries (EBoDE Working Group 2011). Due to the time-activity profiles of contemporary ... -
Gain saturation in Nd:doped laser materials
Martin, William Eugene; Milam, David (1982-07)Saturation of gain in Nd:doped silicate, phosphate, and fluorophosphate glasses, and in doped crystals of YAG and YLF was observed during amplification of 1064 and 1053 nm pulses with durations of 1. 0, 9. 0, and 50 ns. ... -
A global observational analysis to understand changes in air quality during exceptionally low anthropogenic emission
Sokhi, Ranjeet (2021-08-20)This global study, which has been coordinated by the World Meteorological Organization Global Atmospheric Watch (WMO/GAW) programme, aims to understand the behaviour of key air pollutant species during the COVID-19 pandemic ... -
Gravity-wave-induced cloud formation in desert dust : Observation with temperature/humidity/aerosol Raman lidar in the framework of earlinet
Ansmann, Albert; Mattis, I.; Mueller, D.; Wandinger, U.; Althausen, D. (ESA PUBLICATIONS DIVISION C/O ESTEC, 2004)The evolution of three cloud layers that formed during the passage of a gravity wave in a desert dust layer was monitored with an advanced Raman lidar. Dust is characterized in terms of particle optical properties. The ... -
Ground-based validation of CALIPSO observations of dust and smoke in the Cape Verde region
Tesche, Matthias; Wandinger, U.; Ansmann, A.; Althausen, D.; Mueller, D.; Omar, A. H. (2013-04-16)Ground-based Raman lidar measurements during the second Saharan Mineral Dust Experiment (SAMUM-2) in 2008 were used for validation of measurements of the lidar aboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite ... -
Halo ratio from ground based all-sky imaging
Dandini, Paolo; Ulanowski, Zbigniew; Campbell, David; Kaye, Richard (2019-02-28)The halo ratio (HR) is a quantitative measure characterizing the occurrence of the 22 halo peak associated with cirrus. We propose to obtain it from an approximation to the scattering phase function (SPF) derived from ... -
HiFLEx – a highly flexible package to reduce cross-dispersed Echelle spectra
Errmann, Ronny; Cook, Neil; Jones, Hugh; Anglada Escude, Guillem; Sithajan, Sirinrat; Semenko, Eugene; Mkrtichian, David; Martin, Bill; Tanvir, Tabassum; Feng, F.; Collett, James (2020-06)We describe a flexible data reduction package for high resolution cross-dispersed echelle data. This open-source package is developed in Python and includes optional GUIs for most of the steps. It does not require any ... -
High Average Power Phase-Coded Laser System for the CTF3 Photoinjector.
Kurdi, G.; Musgrave, I. O.; Divall, M.; Springate, E.; Hirst, G.; Ross, I.; Martin, Bill (Institute of Electrical and Electronics Engineers (IEEE), 2007)In this paper we present the results of a diode-pumped high average power high repetition rate laser system delivering 50 Hz macropulses of 1.5GHz 1047nm pulses with a mean power of 9 kW per macropulse. (C) Optical Society ... -
A High Speed Particle Phase Discriminator (PPD-HS) for the classification of airborne particles, as tested in a continuous flow diffusion chamber
Mahrt, Fabian; Wieder, Jorg; Dietlicher, Remo; Smith, Helen R.; Stopford, Chris; Kanji, Zamin (2019-06-14)A new instrument, the High-speed Particle Phase Discriminator (PPD-HS), developed at the University of Hertfordshire, for sizing individual cloud hydrometeors and determining their phase is described herein. PPD-HS performs ... -
High-sensitivity Stokes spectropolarimetry on cyanobacteria
Martin, Bill; Hesse, E.; Hough, J.H.; Gledhill, T.M. (2016-02-01)We investigate the spectral signatures arising from the optical properties of chlorophyll in linear and circularly polarised scattered light from cyanobacteria. We include Stokes scattering coefficient measurements on two ... -
High-speed scanning laser diffractometer
Kaye, Paul H.; Ludlow, I.K. (1979)A high-speed laser diffractometer is described which employs a novel scanned array or optical light guides to record the angular intensity variation of light scattered radially by a particle throughout an arc of 180 degrees ... -
Highly replicable, low-cost, portable, general-purpose, high-resolution spectrometer with applications in stellar studies and exoplanet science
Baker, Clark; Anglada-Escude, Guillem; Jones, Hugh; Martin, Bill (SPIE, 2019-09-09)High-resolution spectrometers have proven to be an important tool for astronomical observations and continue to have an ever expanding set of applications, such as high resolution IFS (Integral Field Spectroscopy). With ... -
A history of high-power laser research and development in the United Kingdom
Danson, Colin N.; White, Malcolm; Barr, John R. M.; Bett, Thomas; Blyth, Peter; Bowley, David; Brenner, Ceri; Collins, Robert J.; Croxford, Neal; Dangor, A. E. Bucker; Devereux, Laurence; Dyer, Peter E.; Dymoke-Bradshaw, Anthony; Edwards, Christopher B.; Ewart, Paul; Ferguson, Allister I.; Girkin, John M.; Hall, Denis R.; Hanna, David C.; Harris, Wayne; Hillier, David I.; Hooker, Christopher J.; Hooker, Simon M.; Hopps, Nicholas; Hull, Janet; Hunt, David; Jaroszynski, Dino A.; Kempenaars, Mark; Kessler, Helmut; Knight, Sir Peter L.; Knight, Steve; Knowles, Adrian; Lewis, Ciaran L. S.; Lipton, Ken S.; Littlechild, Abby; Littlechild, John; Maggs, Peter; Malcolm OBE, Graeme P. A.; Mangles, Stuart P. D.; Martin, Bill (2021-04-27)The first demonstration of laser action in ruby was made in 1960 by T. H. Maiman of Hughes Research Laboratories, USA. Many laboratories worldwide began the search for lasers using different materials, operating at different ... -
Holistic evaluation of the environmental impacts of shipping in the sensitive region of Ria de Aveiro
Monteiro, A.; Rodrigues, V.; Picado, A.; Dias, J.M.; Abrantes, N.; Ré, A.; Rosa, M.; Russo, M.; Barreirinha, A.; Potiris, M.; Aghito, M.; Hänninen, R.; Majamäki, E.; Grönholm, T.; Alyuz, U.; Sokhi, R.; Kukkonen, Jaakko; Jalkanen, J.-P. (2024-10-10)Shipping activity can be a substantial source of pollution and impact on the environment, including air, water and ecosystems, as well as adverse health and climatic effects. Due to the distribution of maritime transport ... -
HSRL-2 aerosol optical measurements and microphysical retrievals vs. airborne in situ measurements during DISCOVER-AQ 2013: : an intercomparison study
Mueller, Detlef; Sawamura, Patricia; Moore, Richard H.; Burton, Sharon P.; Chemyakin, Edward; Kolgotin, Alexei; Ferrare, Richard A.; Hostetler, Chris A.; Ziemba, Luke D.; Beyersdorf, Andreas J.; Anderson, Bruce E. (2017-06-16)We present a detailed evaluation of remotely-sensed aerosol microphysical properties obtained from an advanced, multi-wavelength High Spectral Resolution Lidar (HSRL-2) during the 2013 NASA DISCOVER-AQ field campaign. ... -
Ice crystal habits from cloud chamber studies obtained by in-line holographic microscopy related to depolarization measurements
Amsler, P.; Stetzer, O.; Schnaiter, M.; Hesse, E.; Benz, S.; Moehler, O.; Lohmann, U. (2009)We investigate hydrometeor habits at the AIDA chamber with a newly developed in-line holographic microscope HOLographic Imager for Microscopic Objects (HOLIMO). Sizes and habits of ice crystals and droplets in a mixed-phase ... -
Ice formation in Saharan dust over central Europe observed with temperature/humidity//aerosol Raman lidar
Ansmann, A.; Mattis, I.; Mueller, D.; Wandinger, U.; Radlach, M.; Althausen, D.; Damoah, R. (2005-04-26)[1] Three gravity-wave-induced clouds and a glaciating altocumulus layer were continuously monitored with lidar at Leipzig, Germany, on 21 November 2003. The midtropospheric clouds formed in Saharan dust at heights from ... -
Identification of Atmospheric Mineral Dust Composition from Raman-Scattering Spectra
Mueller, Detlef; Tatarov, Boyan; Tesche, Matthias; Shin, Sung-Kyun (2018-08-26) -
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, ... -
Implications of the Method of Construction of UK Number Plates for Infrared Reflectance and Camera Settings on ANPR System
Rhead,, Michael; Ramalingam, Soodamani; Gurney, Rob; Martin, Bill; Jones, Andrew (Institute of Electrical and Electronics Engineers (IEEE), 2019-10-01)This paper considers the implications of two aspects of number plates firstly the varied manufacturing process in the physical construction of vehicle number plates that might affect the reflectance characteristics and ...