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Now showing items 161-180 of 432
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Imprinting interference fringes in massive optomechanical systems
Steuernagel, Ole (2011-12-13)An interferometric scheme for the creation of momentum superposition states of mechanical oscillators using a quantum mirror kicked by free photons is analyzed. The scheme features ultrafast preparation with immediate ... -
Improved identification of the solution space of aerosol microphysical properties derived from the inversion of profiles of lidar optical data, part 1: theory
Kolgotin, Alexei; Mueller, Detlef; Chemyakin, Eduard V.; Romanov, A. (2016-11-30)Multiwavelength Raman/high spectral resolution lidars that measure backscatter coefficients at 355, 532, and 1064 nm and extinction coefficients at 355 and 532 nm can be used for the retrieval of particle microphysical ... -
Improved identification of the solution space of aerosol microphysical properties derived from the inversion of profiles of lidar optical data, part 2: Simulations with synthetic optical data
Kolgotin, Alexei; Mueller, Detlef; Chemyakin, Eduard V.; Romanov, A. (2016-11-30)We developed a mathematical scheme that allows us to improve retrieval products obtained from the inversion of multiwavelength Raman/HSRL lidar data, commonly dubbed “3 backscatter 2 extinction” (3β 2α) lidar. This scheme ... -
Improved identification of the solution space of aerosol microphysical properties derived from the inversion of profiles of lidar optical data, part 3: Case studies
Kolgotin, Alexei; Mueller, Detlef; Chemyakin, Eduard V.; Romanov, A.; Alehnovich, Valentin (2018-03-27)We conclude our series of publications on the development of the gradient correlation method (GCM) which can be used for an improved stabilization of the solution space of particle microphysical parameters derived from ... -
An improved low cost apparatus and method for the detection of a fluid-borne particle
School of Physics, Astronomy and Mathematics; Science & Technology Research Institute; Centre for Atmospheric and Climate Physics Research; Particle Instruments and diagnostics; Kaye, Paul H.; Hirst, Edwin (2012-05-03)An apparatus for the detection of a fluid-borne particle (10) in an optically defined particle sensing zone, the apparatus comprising: i) a scattering chamber (40); ii) a means for providing a sample of fluid (34), containing ... -
An improved low-cost apparatus and method for the detection of a fluid-borne particle
School of Physics, Astronomy and Mathematics; Science & Technology Research Institute; Centre for Atmospheric and Climate Physics Research; Particle Instruments and diagnostics; Kaye, Paul H.; Hirst, Edwin (2012-05-02) -
Improved understanding of the vertical distribution of simulated dust distribution in the Saharan Air Layer during the ICE-D field campaign with the WRF-CHEM model
Chiao, Sen; Jenkins, Gregory; Ulanowski, Zbigniew; Smith, Helen (2016-01-11)During the period of 4-27 August of 2015, the UK Ice in dust clouds experiment will take place in Cape Verde. UK_ICE-D will characterize aerosol particles and their ability to act as ice nuclei (IN) and cloud condensation ... -
In-situ observations of volcanic ash clouds from the FAAM aircraft during the eruption of Eyjafjallajökull in 2010
Johnson, Ben; Turnbull, Kate; Brown, Phil; Burgess, Rachel; Dorsey, James; Baran, Anthony J.; Webster, Helen; Haywood, Jim; Cotton, Richard; Ulanowski, Zbigniew; Hesse, Evelyn; Wolley, Alan; Rosenberg, Philip (2012)During April–May 2010 the UK Facility for Airborne Atmospheric Measurements (FAAM) BAe-146 aircraft flew 12 flights targeting volcanic ash clouds around the UK. The aircraft observed ash layers between altitudes of 2–8 km ... -
Incidence of rough and irregular atmospheric ice particles from Small Ice Detector 3 measurements
Ulanowski, Joseph; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard; Cotton, Richard J.; Hesse, Evelyn; Collier, Christopher T. (2014-02-12)The knowledge of properties of ice crystals such as size, shape, concavity and roughness is critical in the context of radiative properties of ice and mixed-phase clouds. Limitations of current cloud probes to measure these ... -
Incidence of rough and irregular atmospheric ice particles from Small Ice Detector 3 measurements
Ulanowski, Zbigniew; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard; Cotton, Richard J.; Hesse, Evelyn; Collier, Christopher T. (2013)The knowledge of properties of ice crystals such as size, shape, concavity and roughness is critical in the context of radiative properties of ice and mixed phase clouds. Limitations of current cloud probes to measure these ... -
Incoherent light in tapered graded-index fibre: a study of transmission and modal noise
Choochalerm, Piyamas; Martin, Bill; Jones, Hugh; Usher, Sarah; Wright, Thomas; Yerolatsitis, Stephanos (2023-01-30)We investigated the impact of taper length on light transmission through tapered graded-index fibres. We tested commercial fibres from Thorlabs and a custom graded-index fibre using both coherent and incoherent light ... -
Indo-Asian pollution during INDOEX : Microphysical particle properties and single-scattering albedo inferred from multiwavelength lidar observations
Mueller, D.; Franke, K.; Ansmann, A.; Althausen, D.; Wagner, F. (2003-10-07)[1] We present for the first time a comprehensive data set of vertically resolved physical particle properties, and the single-scattering albedo at 532 nm, derived from multiwavelength lidar observations of pollution plumes ... -
Influence of biogenic pollen on optical properties of atmospheric aerosols observed by lidar over Gwangju, South Korea
Noh, Young Min; Mueller, D.; Lee, Hanlim; Choi, Tae Jin (2013-04)For the first time, optical properties of biogenic pollen, i.e., backscatter coefficients and depolarization ratios at 532 nm were retrieved by lidar observations. The extinction coefficient was derived with the assumption ... -
Influence of Saharan dust on cloud glaciation in southern Morocco during the Saharan Mineral Dust Experiment
Ansmann, A.; Tesche, Matthias; Althausen, D.; Mueller, D.; Seifert, P.; Freudenthaler, V.; Heese, B.; Wiegner, M.; Pisani, G.; Knippertz, P.; Dubovik, O. (2008-02-27)Multiwavelength lidar, Sun photometer, and radiosonde observations were conducted at Ouarzazate ( 30.9 degrees N, 6.9 degrees W, 1133 m above sea level, asl), Morocco, in the framework of the Saharan Mineral Dust Experiment ... -
Influence of the vertical absorption profile of mixed Asian dust plumes on aerosol direct radiative forcing over East Asia
Noh, Y. M.; Lee, KwonHo; Shin, Sungkyun; Kim, Kwanchul; Mueller, Detlef (2016-08-01)We estimate the aerosol direct radiative forcing (ADRF) and heating rate profiles of mixed East Asian dust plumes in the solar wavelength region ranging from 0.25 to 4.0 μm using the Santa Barbara Discrete Ordinate Atmospheric ... -
Influence of wind speed on optical properties of aerosols in the marine boundary layer measured by ship-borne DePolarization Lidar in the coastal area of Korea
Shin, Dongho; Mueller, D.; Choi, Tae Jin; Noh, Young Min; Yoon, Young Jun; Lee, Kwon-Ho; Shin, Sung Kyun; Chae, Nam Yi; Kim, Kwanchul; Kim, Young Joon (2014-02)Shipboard measurements of microphysical and optical properties of marine boundary-layer aerosols were performed around the Korean Peninsula from 2 to 5 December 2009. The measurements were conducted aboard the Korean ... -
Information content of multiwavelength lidar data on the base of Eigenvalues analysis
Veselovskii, Igor; Kolgotin, Alexei; Mueller, D.; Whiteman, D. (ESA PUBLICATIONS DIVISION C/O ESTEC, 2004)Multiwavelength Raman lidar technique in combination with sophisticated inversion algorithms has been recognized as a new tool to derive information about microphysical properties of atmospheric aerosols. The optical input ... -
Information content of multiwavelength lidar data with respect to microphysical particle properties derived from eigenvalue analysis
Veselovskii, Igor; Kolgotin, A.; Mueller, D.; Whiteman, D.N. (2005-09-01)The multiwavelength Raman lidar technique in combination with sophisticated inversion algorithms has been recognized as a new tool for deriving information about the microphysical properties of atmospheric aerosols. The ... -
An infrared desert dust index for the Along-Track Scanning Radiometers
Good, Elizabeth; Kong, Xin; Embury , Owen; Merchant, Chris; Remedio, John (2012)A new aerosol index for the Along-Track Scanning Radiometers (ATSRs) is presented that provides a means to detect desert dust contamination in infrared SST retrievals. The ATSR Saharan dust index (ASDI) utilises only the ... -
Initial investigation into using Fourier spectra as a means of classifying ice crystal shapes
Stopford, C.; Ulanowski, Z.; Hesse, E.; Kaye, Paul H.; Hirst, E.; Schnaiter, M.; McCall, D. (University of Hertfordshire, 2008)Fast Fourier Transforms of azimuthal light scattering patterns are investigated as a method for classifying cirrus cloud ice crystals. Small Ice Detector Mk. 2 data is compared to modelled reference data of various aspect ...