Browsing by Author "Centre for Atmospheric and Climate Physics Research"

Now showing items 81-100 of 432

    • Depolarization Ratio Retrievals Using AERONET Sun Photometer Data 

      Lee, Kyung-Hwa; Mueller, D.; Noh, Young-Min; Shin, Sung-Kyun; Shin, Dong-Ho (2010-09)
      We present linear particle depolarization ratios (LPDRs) retrieved from measurements with an AERONET Sun photometer at the Gwangju Institute of Science and Technology (GIST), Korea (35.10 degrees N, 126.53 E) between 19 ...

    • Depolarization Ratios Retrieved by AERONET Sun/Sky Radiometer Data and Comparison to Depolarization Ratios Measured With Lidar 

      Mueller, Detlef; Noh, Youngmin; Lee, Kyunghwa; Kim, Kwanchul; Lee, KwonHo; Shimizu, Atsushi; Kim, Sang-Woo; Sano, Itaru; Park, Chan Bong (2017-05-22)
      The linear particle depolarization ratios at 440, 675, 870, and 1020 nm were derived using data taken with the AERONET sun–sky radiometer at Seoul (37.45° N, 126.95° E), Kongju (36.47° N, 127.14° E), Gosan (33.29° N, ...

    • Desert dust aerosol air mass mapping in the western Sahara, using particle properties derived from space-based multi-angle imaging 

      Kahn, Ralph; Petzold, Andreas; Wendisch, Manfred; Bierwirth, Eike; Dinter, Tilman; Esselborn, Michael; Fiebig, Marcus; Heese, Birgit; Knippertz, Peter; Mueller, D.; Schladitz, Alexander; Hoyningen-Huene, Andwolfgang Von (2009-02)
      Coincident observations made over the Moroccan desert during the Sahara mineral dust experiment (SAMUM) 2006 field campaign are used both to validate aerosol amount and type retrieved from multi-angle imaging spectroradiometer ...

    • Design and field campaign validation of a multi-rotor unmanned aerial vehicle and optical particle counter 

      Girdwood, Joseph; Smith, Helen R.; Stanley, Warren; Ulanowski, Joseph; Stopford, Chris; Chemel, Charles; Doulgeris, Konstantinos-Matthaios; Brus, David; Campbell, David; Mackenzie, Robert (2020-12-07)
      Small unmanned aircraft (SUA) have the potential to be used as platforms for the measurement of atmospheric particulates. The use of an SUA platform for these measurements provides benefits such as high manoeuvrability, ...

    • Design and field campaign validation of a multi-rotor unmanned aerial vehicle and optical particle counter 

      Girdwood, Joseph; Smith, Helen R.; Stanley, Warren; Ulanowski, Joseph; Stopford, Chris; Chemel, Charles; Doulgeris, Konstantinos-Matthaios; Brus, David; Campbell, David; Mackenzie, Robert (2020-12-07)
      Small unmanned aircraft (SUA) have the potential to be used as platforms for the measurement of atmospheric particulates. The use of an SUA platform for these measurements provides benefits such as high manoeuvrability, ...

    • Detection of Airborne Biological Particles in Indoor Air Using a Real-Time Advanced Morphological Parameter UV-LIF Spectrometer and Gradient Boosting Ensemble Decision Tree Classifiers 

      Crawford, Ian; Topping, David; Gallagher, M.W.; Forde, Elizabeth; Lloyd , J R; Foot, Virginia; Stopford, Chris; Kaye, Paul H. (2020-09-29)
      We present results from a study evaluating the utility of supervised machine learning to classify single particle ultraviolet laser-induced fluorescence (UV-LIF) signatures to investigate airborne primary biological aerosol ...

    • Detection of circular polarization in light scattered from photosynthetic microbes 

      Sparks, W.; Hough, J.; Germer, T.A.; Chen, F.; DasSarma, S.; DasSarma, P.; Robb, F.T.; Manset, N.; Kolokolova, L.; Reid, N.; Macchetto, F.D.; Martin, William Eugene (2009-05)
      The identification of a universal biosignature that could be sensed remotely is critical to the prospects for success in the search for life elsewhere in the universe. A candidate universal biosignature is homochirality, ...

    • Difficulties in early ice detection with the Small Ice Detector 2 HIAPER (SID-2H) in maritime cumuli 

      Johnson, Alexandria; Lasher-Trapp, Sonia; Bensemer, Aaron; Ulanowski, Joseph; Heymsfield, Andrew J. (2014-06)
      The Small Ice Detector 2 HIAPER (SID-2H) was used to attempt to detect small ice particles in the early stages of ice formation in the high liquid water environment of tropical maritime cumulus clouds sampled during the ...

    • Direct measurement of gain recovery in a saturated Nd-glass amplifier 

      Martin, William Eugene; Milam, D. (1978)
      The temporal dependence of the gain recovery in a Nd-silicate glass amplifier has been directly observed after the passage of a short intense saturating laser pulse. The gain recovery time constant measured for ED-2 glass ...

    • Discussion of a physical optics method and its application to absorbing smooth and slightly rough hexagonal prisms 

      Hesse, Evelyn; Taylor, Laurence; Collier, Christopher T.; Penttila, Antti; Nousiainen, Timo; Ulanowski, Zbigniew (2018-10-01)
      Three different mathematical solutions of a physical optics model for far field diffraction by an aperture due to Karczewski and Wolf are discussed. Only one of them properly describes diffraction by an aperture and can, ...

    • Dispersion of tracers in the stable atmosphere of a valley opening onto a plain 

      Quimbayo-Duarte, Julian; Staquet, Chantal; Chemel, Charles; Arduini, Gabriele (2019-08-01)
      We quantify the impact of a valley-wind system on the transport of passive tracers in the stably-stratified atmosphere of a valley dynamically decoupled from the atmosphere above. The simple configuration of an idealized ...

    • Drivers of severe air pollution events in a deep valley during wintertime: a case study from the Arve river valley, France 

      Quimbayo-Duarte, Julian; Chemel, Charles; Staquet, Chantal; Troude, Florence; Arduini, Gabriele (2021-02-15)
      The Arve river valley airshed in the French Alps experiences particularly severe air pollution during wintertime stable atmospheric conditions associated with persistent cold-air pools. PM10 data recorded in the region ...

    • Dual-FOV Raman and Doppler lidar studies of aerosol-cloud interactions : Simultaneous profiling of aerosols, warm-cloud properties, and vertical wind 

      Schmidt, Jörg; Ansmann, Albert; Bühl, Johannes; Baars, Holger; Wandinger, Ulla; Mueller, D.; Malinka, Aleksey V. (2014-05-16)
      For the first time, colocated dual-field of view (dual-FOV) Raman lidar and Doppler lidar observations (case studies) of aerosol and cloud optical and microphysical properties below and within thin layered liquid water ...

    • Dual-wavelength Raman lidar observations of the extinction-to-backscatter ratio of Saharan dust 

      Mattis, I.; Ansmann, A.; Mueller, D.; Wandinger, U.; Althausen, D. (2002-05-01)
      [1] For the first time, height profiles of the extinction-to-backscatter ratio (lidar ratio) of desert dust particles were simultaneously measured at 355 and 532 nm. The observations were performed with an advanced Raman ...

    • Dust and smoke transport from Africa to South America : Lidar profiling over Cape Verde and the Amazon rainforest 

      Ansmann, Albert; Baars, Holger; Tesche, Matthias; Mueller, D.; Althausen, Dietrich; Engelmann, Ronny; Pauliquevis, Theotonio; Artaxo, Paulo (2009-06-02)
      Quasi-simultaneous vertically resolved multiwavelength aerosol Raman lidar observations were conducted in the near field (Praia, Cape Verde, 15 degrees N, 23.5 degrees W) and in the far field (Manaus, Amazon basin, Brazil, ...

    • Dust layer profiling using an aerosol dropsonde 

      Ulanowski, Z.; Kaye, Paul H.; Hirst, Edwin; Wieser, Andreas; Stanley, Warren (2015-04-12)
      Routine meteorological data is obtained in the atmosphere using disposable radiosondes, giving temperature, pressure, humidity and wind speed. Additional measurements are obtained from dropsondes, released from research ...

    • Dust mobilization and transport in the northern Sahara during SAMUM 2006 - a meteorological overview 

      Knippertz, Peter; Ansmann, Albert; Althausen, Dietrich; Mueller, D.; Tesche, Matthias; Bierwirth, Eike; Dinter, Tilman; Mueller, Thomas; Von Hoyningen-Huene, Wolfgang; Schepanski, Kerstin; Wendisch, Manfred; Heinold, Bernd; Kandler, Konrad; Petzold, Andreas; Schuetz, Lothar; Tegen, Ina (2009-02)
      The SAMUM field campaign in southern Morocco in May/June 2006 provides valuable data to study the emission, and the horizontal and vertical transports of mineral dust in the Northern Sahara. Radiosonde and lidar observations ...

    • Dynamic shear suppression in quantum phase space 

      Oliva, Maxime; Steuernagel, Ole (2019-01-18)
      Classical phase space flow is inviscid. Here we show that in quantum phase space Wigner's probability current J can be effectively viscous. This results in shear suppression in quantum phase space dynamics which enforces ...

    • Dynamical Downscaling Approach for Wintertime Seasonal-Scale Simulation over the Western Himalayas 

      Tiwari, Pushp Raj; Mohanty, Uma C.; Dey, Sagnik; Sinha, Palash; Raju, P. V. S.; Shekhar, M. S. (2014-08-01)
      The performance of RegCM4 for seasonal-scale simulation of winter circulation and associated precipitation over the Western Himalayas (WH) is examined. The model simulates the circulation features and precipitation in three ...

    • EARLINET correlative measurements for CALIPSO 

      Mattis, Ina; Mona, Lucia; Mueller, D.; Pappalardo, Gelsomina; Alados Arboledas, Lucas; D'Amico, Giuseppe; Amodeo, Aldo; Apituley, Arnoud; Maria Baldasano, Jose; Boeckmann, Christine; Boesenbergg, Jens; Chaikovsky, Anatoli; Comeron, Adolfo; Giannakaki, Elina; Grigorov, Ivan; Guerrero Rascado, Juan Luis; Gustafsson, Ove; Iarlori, Marco; Linne, Holger; Mitev, Valentin; Molero Menendez, Francisco; Nicola, Doina; Papayannis, Alexandros; Perez Garcia-Pando, Carlos; Perrone, Maria Rita; Pietruczuk, Aleksander; Putaud, Jean-Philippe; Ravetta, Francois; Rodriguez, Alejandro; Seifert, Patric; Sicard, Michael; Simeonov, Valentin; Sobolewski, Piotr; Spinelli, Nicola; Stebel, Kerstin; Stohl, Andreas; Tesche, Matthias; Trickl, Thomas; Wang, Xuan; Wiegner, Matthias (SPIE, 2007)
      The European Aerosol Research Lidar Network (EARLINET) was established in 2000 to derive a comprehensive, quantitative, and statistically significant data base for the aerosol distribution on the European scale. At present, ...