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Now showing items 41-60 of 432
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British and Korean Lidars for Atlid Validation (BAKLAVA)
Tesche, Matthias; Tatarov, Boyan; Mueller, Detlef; Noh, Youngmin; Shin, Sung-Kyun (2018-06-11)Measurements with two unique spectrometric aerosol Raman lidars located in the United Kingdom (51.75 °N; 0.24 °W) and the Republic of Korea (35.23 °N;126.84 °E) will be conducted during EarthCARE overpasses to validate the ... -
de Broglie wavelength reduction for a multiphoton wavepacket
Steuernagel, O. (2002)An experiment is proposed that permits the observation of the reduced de Broglie wavelengths of two and four-photon wave packets using present technology. It is suggested to use a Mach-Zehnder setup and feed both input ... -
Calibration of a high spectral resolution lidar using a michelson interferometer, with data examples from ORACLES
Burton, S. P.; Hostetler, C. A.; Cook, A. L.; Hair, J. W.; Seaman, S. T.; Scola, S.; Harper, D. B.; Smith, J. A.; Fenn, M. A.; Ferrare, Richard A.; Saide, P. E.; Chemyakin, E. V.; Müller, D. (2018-07-17)The NASA Langley airborne second-generation High Spectral Resolution Lidar (HSRL-2) uses a density-tuned field-widened Michelson interferometer to implement the HSRL technique at 355 nm. The Michelson interferometer optically ... -
Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology
Barone, Teresa; Hesse, Evelyn; Seaman, Clara; Baran, Anthony; Beck, T.W.; Harris, M.L.; Jaques, P.A.; Lee, T.; Mischler, S.E. (2019-09-01)The cloud and aerosol spectrometer (CAS) was calibrated to enable CAS sizing of coal dust for studies on flammable dust control. Coal dust sizes were determined by light-scattering theories for irregular particles that ... -
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 ... -
Changes in extreme events over Asia for present and future climate conditions based on a modelling analysis of atmospheric circulation anomalies
Sokhi, Ranjeet; Tiwari, P. R.; de Medeiros , Joanna S N; Folberth, Gerd; Collins, W.J. (2021-10)Synoptic weather and larger scale circulation patterns are closely coupled and have a major influence on regional weather and extreme events. This study examines the role of regional circulations on meteorology and extreme ... -
Characterisation and source identification of biofluorescent aerosol emissions over winter and summer periods in the United Kingdom
Forde, Elizabeth; Gallagher, Martin W.; Foot, Virginia; Sada-Esteve, Roland; Crawford, I.A.; Kaye, Paul; Stanley, Warren; Topping, David (2019-02-08)Primary biological aerosol particles (PBAPs) are an abundant subset of atmospheric aerosol particles which comprise viruses, bacteria, fungal spores, pollen, and fragments such as plant and animal debris. The abundance and ... -
Characterisation of bioaerosol emissions from a Colorado pine forest : results from the BEACHON-RoMBAS experiment
Crawford, I.P.; Robinson, Niall; Flynn, M.; Foot, V.E.; Gallagher, M.W.; Huffman, J. A.; Stanley, Warren; Kaye, Paul H. (2014-01-21)The behaviour of Primary Biological Aerosols (PBA) at an elevated, un-polluted North American forest site was studied using an Ultra Violet-Light Induced Fluorescence (UV-LIF) measurement technique in conjunction with ... -
Characterization of Asian dust and Siberian smoke with multiwavelength Raman lidar over Tokyo, Japan in spring 2003
Murayama, T.; Mueller, D.; Wada, K.; Shimizu, A.; Sekiguchi, M.; Tsukamoto, T. (2004-12-02)[ 1] In the spring of 2003, we observed lofted Asian dust and Siberian forest-fire smoke plumes in the free troposphere over Tokyo, Japan with a dual-wavelength Raman lidar. These data show clear signatures of the optical ... -
Characterization of atmospheric aerosols with multiwavelength Raman lidar
Mueller, D.; Mattis, I.; Kolgotin, Alexei; Ansmann, Albert; Wandinger, U.; Althausen, D. (SPIE, 2007)Multiwavelength Raman lidar observations have matured into a powerful tool for the vertical resolved characterization of optical and microphysical properties of atmospheric aerosol particles. Raman lidars that operate with ... -
Characterization of fresh and aged biomass burning events using multiwavelength Raman lidar and mass spectrometry
Nicolae, D.; Nemuc, A.; Mueller, D.; Talianu, C.; Vasilescu, J.; Belegante, L.; Kolgotin, A. (2013-04-16)This paper focuses on optical and microphysical properties of long-range transported biomass burning (BB) aerosols and their variation with atmospheric evolution (ageing), as observed by a multiwavelength Raman lidar, part ... -
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 ... -
Characterization of small ice crystals using frequency analysis of azimuthal scattering patterns
Ulanowski, Zbigniew; Stopford, Chris; Hesse, Evelyn; Kaye, Paul H.; Hirst, Edwin; Schnaiter, M. (2007)Azimuthal scattering patterns obtained from ice crystals using the Small Ice Detector 2 are examined. They are converted to frequency spectra using Fast Fourier Transform. To classify the shape of the crystals, the spectra ... -
Characterizing ice particles using two-dimensional reflections of a lidar beam
Goerke, Marissa; Ulanowski, Zbigniew; Ritter, Georg; Hesse, Evelyn; Neely, Ryan; Taylor, Laurence; Stillwell, Robert; Kaye, Paul (2017-07-01)We report a phenomenon manifesting itself as brief flashes of light on the snow surface near a lidar beam. The flashes are imaged and interpreted as specular reflection patterns from individual ice particles. Such patterns ... -
Cirrus clouds
Heymsfield, Andrew J.; Kraemer, Martina; Brown, Philip; Cziczo, Dan; Franklin, Charmaine; Lawson, Paul; Lohmann, Ulrike; Luebke, Anna; McFarquhar, Greg; Ulanowski, Zbigniew; Van Tricht, Kristof (2017)The goal of this article is to synthesize information about what is now known about one of the three main types of clouds, cirrus, and to identify areas where more knowledge is needed. Cirrus clouds, composed of ice ... -
Cirrus optical properties observed with lidar, radiosonde, and satellite over the tropical Indian Ocean during the aerosol-polluted northeast and clean maritime southwest monsoon
Seifert, P.; Ansmann, A.; Mueller, D.; Wandinger, U.; Althausen, D.; Heymsfield, A. J.; Massie, S. T.; Schmitt, C. (2007-09-14)Cirrus formation and geometrical and optical properties of tropical cirrus as a function of height and temperature are studied on the basis of INDOEX ( Indian Ocean Experiment) lidar and radiosonde measurements and satellite ... -
A class of Symmetric controlled quantum operations
Steuernagel, O.; Huelga, S.F. (2001)Certain quantum gates, such as the controlled-NOT gate, are symmetric in terms of the operation of the control system upon the target system and vice versa. However, no operational criteria yet exist for establishing whether ... -
Classifying atmospheric ice crystals by spatial light scattering
Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard; Ulanowski, Zbigniew; Hesse, Evelyn; DeMott, P.; Saunders, C.; Connolly, P. (2008)We describe preliminary results from an optical scattering instrument designed to assess the shapes and sizes of microscopic atmospheric cloud particles, especially the smallest ice crystals, that can profoundly affect ... -
Closure study on optical and microphysical properties of a mixed urban and Arctic haze air mass observed with Raman lidar and Sun photometer
Mueller, D.; Mattis, I.; Ansmann, A.; Wehner, B.; Althausen, D.; Wandinger, U.; Dubovik, O. (2004-07)[1] We present a comprehensive optical and microphysical characterization of an intense haze event observed over Leipzig ( 51.3 degreesN, 12.4 degreesE), Germany, in April 2002. This event was characterized by unusually ... -
Cloud chamber experiments on the origin of ice crystal complexity in cirrus clouds
Schnaiter, Martin; Järvinen, Emma; Vochezer, Paul; Abdelmonem, Ahmed; Wagner, Robert; Jourdan, Olivier; Mioche, Guillaume; Shcherbakov, Valery N.; Schmitt, Carl G.; Tricoli, Ugo; Ulanowski, Zbigniew; Heymsfield, Andrew J. (2016-04-25)This study reports on the origin of ice crystal complexity and its influence on the angular light scattering properties of cirrus clouds. Cloud simulation experiments were conducted at the AIDA (Aerosol Interactions and ...