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

Now showing items 201-220 of 432

    • Leaf Scattering Polarimetry and Chlorophyll Fluorescence 

      Martin, Bill (2020-02-01)
      A number of spectropolarimetry measurements on leaves using white light and narrow band illumination have been reported in recent years because of interest in signatures for remote sensing of exoplanet life. Chlorophyll ...

    • Lidar measurements for desert dust characterization : an overview 

      Mona, L.; Liu, Z.; Mueller, D.; Omar, A.; Papayannis, A.; Pappalardo, G.; Sugimoto, N.; Vaughan, M. (2012)
      We provide an overview of light detection and ranging (lidar) capability for describing and characterizing desert dust. This paper summarizes lidar techniques, observations, and fallouts of desert dust lidar measurements. ...

    • Lidar measurements of Raman scattering at ultraviolet wavelength from mineral dust over East Asia 

      Tatarov, Boyan; Mueller, D.; Shin, Dong Ho; Shin, Sung Kyun; Mattis, Ina; Seifert, Patric; Noh, Young Min; Kim, Y. J.; Sugimoto, Nobuo (2011-01-17)
      We developed a novel measurement channel that utilizes Raman scattering from silicon dioxide (SiO(2)) quartz at an ultraviolet wavelength (361 nm). The excitation of the Raman signals is done at the primary wavelength of ...

    • Lidar observations of the vertical aerosol flux in the planetary boundary layer 

      Engelmann, Ronny; Wandinger, Ulla; Ansmann, Albert; Mueller, D.; Zeromskis, Egidijus; Althausen, Dietrich; Wehner, Birgit (2008-08)
      The vertical aerosol transport in the planetary boundary layer (PBL) is investigated with lidars. Profiles of the vertical wind velocity are measured with a 2-mu m Doppler wind lidar. Aerosol parameters are derived from ...

    • Lidar profiling of aerosol optical and microphysical properties from space : Overview, review, and outlook 

      Ansmann, A.; Mueller, D.; Wandinger, U.; Mamouri, R.E. (SPIE, 2013)
      The potential of spaceborne lidar to monitor aerosol layering and mixing with high vertical resolution is reviewed. An overview is presented on aerosol lidar techniques of past, present, and future NASA and ESA lidar ...

    • LIDAR SPRECTROSCOPY INSTRUMENT(LISSI):AN INFRASTRUCTURE FACILITY FOR CHEMICAL AEROSOL PROFILING AT THE UNIVERSITY OF HERTFORDSHIRE 

      Tesche, Matthias; Tatarov, Boyan; Noh, Youngmin; Mueller, Detlef (2018-04-13)
      The lidar development at the University of Hertfordshire explores the feasibility of using Raman backscattering for chemical aerosol profiling. This paper provides an overview of the new facility. A high-power Nd:YAG/OPO ...

    • Light scattering and absorption properties of dust particles retrieved from satellite measurements 

      Hu, R-M.; Sokhi, R.S. (2009)
      We use the radiative transfer model and chemistry transport model to improve our retrievals of dust optical properties from satellite measurements. The optical depth and absorbing optical depth of mineral dust can be ...

    • Light scattering and absorption properties of dust particles retrieved from satellite measurements 

      Hu, R-M.; Sokhi, R.S. (2008)
      We use the radiative transfer model and chemistry transport model to improve our retrievals of dust optical properties from satellite measurements. The optical depth and absorbing optical depth of mineral dust can be ...

    • Light scattering by complex ice-analogue crystals 

      Ulanowski, Zbigniew; Hesse, Evelyn; Kaye, Paul H.; Baran, A.J. (2006)
      Angle-dependent light scattering measurements on single ice analogues crystals are described. Phase functions and degree of linear polarization are measured for electrodynamically levitated crystals. A procedure for ...

    • Light scattering by Gaussian rough ice crystals : experimental and modelling results 

      Collier, Christopher Thomas; Hesse, Evelyn; Ulanowski, Joseph; Penttila, Antti; Nousiainen, Timo; Brousseau, Emmanuel (2013-06-17)
      It is qualitatively well understood that ice and mixed-phase clouds have an important role in the radiation balance and climate of the Earth [1,2]. However, quantitative understanding of these clouds is poor, and is one ...

    • Light scattering by ice particles in the Earth's atmosphere and related laboratory measurements 

      Ulanowski, Zbigniew; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard (University of Helsinki, 2010)
      The microphysical properties of ice crystals, such as size, shape, concavity and roughness, are important in the context of radiative properties of ice and mixed phase clouds. Limitations of current cloud probes to measure ...

    • A light scattering instrument for investigating cloud ice microcrystal morphology 

      Kaye, Paul H.; Hirst, E.; Ulanowski, Z.; Hesse, E.; Greenaway, R.; DeMott, P. (2008)
      We describe 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 cloud processes and radiative ...

    • A Light Scattering Model for Large Particles with Surface Roughness 

      Ballington, Harry; Hesse, Evelyn (2024-09)
      A physical-optics hybrid method designed for the computation of single-scattering properties of particles with complex shapes, including surface roughness, is presented. The method applies geometric optics using a novel ...

    • Linear polarization signatures of atmospheric dust with the SolPol direct-sun polarimeter 

      Daskalopoulou, Vasiliki; Raptis, Panagiotis I.; Tsekeri, Alexandra; Amiridis, Vassilis; Kazadzis, Stelios; Ulanowski, Zbigniew; Charmandaris, Vassilis; Tassis, Konstantinos; Martin, William (2023-10-12)
      Dust particles in lofted atmospheric layers may present a preferential orientation, which could be detected from the resulting dichroic extinction of the transmitted sunlight. The first indications were provided relatively ...

    • LITES: Rotational Raman Spectra of Air Molecules Measured by High-Resolution-Spectroscopy Lidar 

      Tatarov, Boyan; Mueller, Detlef (2021-10-11)
      We present first measurement from a new lidar facility that has been designed and built at the University of Hertforshire since 2012. LITES (Lidar Innovations for Technologies and Environmental Sciences) allows for testing, ...

    • Local and non-local controls on a persistent cold-air pool in the Arve River Valley 

      Arduini, G.; Chemel, C.; Staquet, C. (2020-02-28)
      A numerical model is used to simulate a persistent cold-air pool (PCAP) event that occurred in the section of the Arve River Valley around Passy in the French Alps. During this period, an upper-level ridge from the Atlantic ...

    • Long-range transport of Saharan dust to northern Europe : The 11-16 October 2001 outbreak observed with EARLINET 

      Ansmann, A.; Boesenberg, J.; Chaikovsky, A.; Comeron, A.; Eckhardt, S.; Eixmann, R.; Freudenthaler, Volker; Ginoux, P.; Komguem, L.; Linne, H.; Marquez, M.A.L.; Matthias, M.; Mattis, I.; Mitev, Valentin; Mueller, D.; Music, S.; Nickovic, S.; Pelon, J.; Sauvage, L.; Sobolewsky, P.; Srivastava, M.K.; Stohl, A.; Torres, O.; Vaughan, G.; Wandinger, U.; Wiegner, M. (2003-12-24)
      [1] The spread of mineral particles over southwestern, western, and central Europe resulting from a strong Saharan dust outbreak in October 2001 was observed at 10 stations of the European Aerosol Research Lidar Network ...

    • Long-term exposure to elemental constituents of particulate matter and cardiovascular mortality in 19 European cohorts : Results from the ESCAPE and TRANSPHORM projects 

      Wang, Meng; Beelen, Rob; Stafoggia, Massimo; Raaschou-Nielsen, Ole; Andersen, Zorana Jovanovic; Hoffmann, Barbara; Fischer, Paul; Houthuijs, Danny; Nieuwenhuijsen, Mark; Weinmayr, Gudrun; Vineis, Paolo; Xun, Wei W.; Dimakopoulou, Konstantina; Samoli, Evangelia; Laatikainen, Tiina; Lanki, Timo; Turunen, Anu W.; Oftedal, Bente; Schwarze, Per; Aamodt, Geir; Penell, Johanna; De Faire, Ulf; Korek, Michal; Leander, Karin; Pershagen, Göran; Pedersen, Nancy L.; Östenson, Claes Göran; Fratiglioni, Laura; Eriksen, Kirsten Thorup; Sørensen, Mette; Tjønneland, Anne; Bueno-de-Mesquita, Bas; Eeftens, Marloes; Bots, Michiel L.; Meliefste, Kees; Krämer, Ursula; Heinrich, Joachim; Sugiri, Dorothea; Key, Timothy; De Hoogh, Kees; Wolf, Kathrin; Peters, Annette; Cyrys, Josef; Jaensch, Andrea; Concin, Hans; Nagel, Gabriele; Tsai, Ming Yi; Phuleria, Harish; Ineichen, Alex; Künzli, Nino; Probst-Hensch, Nicole; Schaffner, Emmanuel; Vilier, Alice; Clavel-Chapelon, Françoise; Declerq, Christophe; Ricceri, Fulvio; Sacerdote, Carlotta; Marcon, Alessandro; Galassi, Claudia; Migliore, Enrica; Ranzi, Andrea; Cesaroni, Giulia; Badaloni, Chiara; Forastiere, Francesco; Katsoulis, Michail; Trichopoulou, Antonia; Keuken, Menno; Jedynska, Aleksandra; Kooter, Ingeborg M.; Kukkonen, Jaakko; Sokhi, Ranjeet S.; Brunekreef, Bert; Katsouyanni, Klea; Hoek, Gerard (2014-05)
      Background: Associations between long-term exposure to ambient particulate matter (PM) and cardiovascular (CVD) mortality have been widely recognized. However, health effects of long-term exposure to constituents of PM on ...

    • Long-term variation study of fine-mode particle size and regional characteristics using AERONET data 

      Shin, Juseon; Sim, Juhyeon; Dehkhoda, Naghmeh; Joo, Sohee; Kim, Taekyung; Kim, Gahyung; Müller, Detlef; Tesche, Matthias; Shin, Sungkyun; Shin, Dongho; Noh, Youngmin (2022-09-06)
      To identify the long-term trend of particle size variation, we analyzed aerosol optical depth (AOD, τ) separated as dust (τD) and coarse-(τPC) and fine-pollution particles (τPF) depending on emission sources and size. ...

    • Low-cost real-time multi-parameter bio-aerosol sensors (invited paper) 

      Foot, V.E.; Kaye, Paul H.; Stanley, Warren; Barrington, S.J.; Gallagher, M.W.; Gabey, A. (2008-06-16)
      Sensors that are able to provide reagent-free, continuous monitoring for potential bio-aerosol hazards are required in many environments. In general, increasing the number of optical and spectroscopic properties of individual ...