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

Now showing items 221-240 of 432

    • Measurement and modeling of light scattering by small particles 

      Hesse, Evelyn; Ulanowski, Zbigniew; McCall, D.; Stopford, Chris; Kaye, Paul H. (University of Bremen, 2008)
      At the University of Hertfordshire we measure and model light scattering by small particles, in particular by such relevant for climate research. The measurements comprise phase functions, linear polarization of single ...

    • Measurement of the charge of airborne 3-10 um spherical dielectric particles charged in an AC unipolar charger 

      Dalley, J.E.J.; Greenaway, R.; Ulanowski, Z.; Hesse, E.; Kaye, Paul H. (2005)
      The charges of airborne 3, 5 and 10 um spherical dielectric test particles passing through a novel AC unipolar charger have been measured individually. The measurements show the effectiveness of the charger and provide ...

    • Measurement report: Balloon-borne in-situ profiling of Saharan dust over Cyprus with the UCASS optical particle counter 

      Kezoudi, Maria; Tesche, Matthias; Smith, Helen; Ulanowski, Zbigniew; Amiridis, Vassilis; Mueller, Detlef; Weinzierl, Bernadett; Tsekeri, Alexandra; Baars, Holger; Dollner, Maximilian; Estellés, Víctor; Bühl, Johannes (2021-05-05)
      This paper presents measurements of mineral dust concentration in the diameter range from 0.4 to 14.0 μm with a novel balloon-borne optical particle counter, the Universal Cloud and Aerosol Sounding System (UCASS). The ...

    • Measurements and comparison of primary biological aerosol above and below a tropical forest canopy using a dual channel fluorescence spectrometer 

      Gabey, A.; Gallagher, M.; Whitehead, J.; Dorsey, J.R.; Kaye, Paul H.; Stanley, W. (2010)
      Aerosol particle size distributions were measured below and above a tropical rainforest canopy in Borneo, Malaysia, in June/July 2008 using the WIBS-3: a single particle dual channel fluorescence spectrometer. Material in ...

    • Measurements of desert dust optical characteristics at Porte au Sahara during SAMUM 

      Von Hoyningen-Huene, W.; Dinter, T.; Kokhanovsky, A. A.; Burrows, J. P.; Wendisch, M.; Bierwirth, E.; Mueller, D.; Diouri, M. (2009-02)
      Main optical characteristics of desert dust, such as phase function and single scattering albedo, have been derived from combinations of sun-/sky-radiometer and satellite measurements during the SAMUM experiment (10 May-10 ...

    • Measuring atmospheric composition change 

      Laj, P.; Klausen, J.; Bilde, M.; Plass-Duelmer, C.; Pappalardo, G.; Clerbaux, C.; Baltensperger, U.; Hjorth, J.; Simpson, D.; Reimann, S.; Coheur, P. -F.; Richter, A.; De Maziere, M.; Rudich, Y.; McFiggans, G. B.; Torseth, K.; Wiedensohler, A.; Morin, S.; Schulz, M.; Allan, J. D.; Attie, J.-L.; Barnes, I.; Birmili, W.; Cammas, J. P.; Dommen, J.; Dorn, H. -P.; Fowler, D.; Fuzzi, S.; Glasius, M.; Granier, C.; Hermann, M.; Isaksen, I. S. A.; Kinne, S.; Koren, I.; Madonna, F.; Maione, M.; Massling, A.; Moehler, O.; Mona, L.; Monks, P. S.; Mueller, D.; Mueller, T.; Orphal, J.; Peuch, V.H.; Stratmann, F.; Tanre, D.; Tyndall, G.; Riziq, A. Abo; Van Roozendael, M.; Villani, P.; Wehner, B.; Wex, H.; Zardini, A. A. (2009-10)
      Scientific findings from the last decades have clearly highlighted the need for a more comprehensive approach to atmospheric change processes. In fact, observation of atmospheric composition variables has been an important ...

    • Mechanisms responsible for the build-up of ozone over South East England during the August 2003 heatwave 

      Francis, X.V.; Chemel, C.; Sokhi, R.S.; Norton, E.G.; Ricketts, H.M.A.; Fisher, B.E.A. (2011-12-01)
      The Community Multiscale Air Quality (CMAQ) model is used in order to quantify reasons for the build-up of ozone over South East England during the August 2003 heatwave. Unlike previous studies, the effects of individual ...

    • Meteorology, air quality, and health in London : The ClearfLo project 

      Bohnenstengel, S.I.; Belcher, S.E.; Aiken, A.; Allan, J.D.; Allen, G.; Bacak, A.; Bannan, T.J.; Barlow, J.F.; Beddows, D.C.S.; Bloss, W.J.; Booth, A.M.; Chemel, C.; Coceal, O.; Di Marco, C.F.; Dubey, M.K.; Faloon, K.H.; Fleming, Z.L.; Furger, M.; Gietl, J.K.; Graves, R.R.; Green, D.C.; Grimmond, C.S.B.; Halios, C.H.; Hamilton, J. F.; Harrison, R.M.; Heal, M.R.; Heard, D. E.; Helfter, C.; Herndon, S.C.; Holmes, R.E.; Hopkins, J. R.; Jones, A.M.; Kelly, F.J.; Kotthaus, S.; Langford, B.; Lee, J.D.; Leigh, R.J.; Lewis, A.C.; Lidster, R.T.; Lopez-Hilfiker, F.D.; McQuaid, J.B.; Mohr, C.; Monks, P. S.; Nemitz, E.; Ng, N.L.; Percival, C.J.; Prévôt, A.S.H.; Ricketts, H.M.A.; Sokhi, R.; Stone, D.; Thornton, J.A.; Tremper, A.H.; Valach, A.C.; Visser, S.; Whalley, L.K.; Williams, L.R.; Xu, L.; Young, D.E.; Zotter, P. (2015-05)
      Capsule: The ClearfLo project provides integrated measurements of the meteorology, composition and particulate loading of London's urban atmosphere to improve predictive capability for air quality. Air quality and heat are ...

    • A Method to Achieve High Dynamic Range in a CMOS Image Sensor Using Interleaved Row Readout 

      Wocial, Thomas; Stefanov, Konstantin; Martin, Bill; Barnes, John; Jones, Hugh (2022-11-15)
      We present a readout scheme for CMOS image sensors that can be used to achieve arbitrarily high dynamic range (HDR) in principle. The linear full well capacity (LFWC) in high signal regions was extended 50 times from 20 ...

    • Microphysical aerosol parameters from multiwavelength lidar 

      Boeckmann, C.; Mironova, I.; Mueller, D. (2005-03)
      The hybrid regularization technique developed at the Institute of Mathematics of Potsdam University (IMP) is used to derive microphysical properties such as effective radius, surface-area concentration, and volume ...

    • Microphysical particle parameters from extinction and backscatter lidar data by inversion with regularization : experiment 

      Mueller, D.; Wagner, F.; Wandinger, U.; Ansmann, A.; Wendisch, M.; Althausen, D.; von Hoyningen-Huene, W. (2000-04-20)
      We present effective radius, volume, surface-area, and number concentrations as well as mean complex refractive index of tropospheric particle size distributions based on lidar measurements at six wavelengths. The parameters ...

    • Microphysical particle parameters from extinction and backscatter lidar data by inversion with regularization: simulation 

      Mueller, D.; Wandinger, U.; Ansmann, A. (1999-04-20)
      A sensitivity study with an inversion scheme that permits one to retrieve physical parameters of tropospheric particle size distributions, e.g., effective radius, volume, surface-area, and number concentrations, as well ...

    • Microphysical particle parameters from extinction and backscatter lidar data by inversion with regularization: theory 

      Mueller, D.; Wandinger, U.; Ansmann, A. (1999-04-20)
      A method is proposed that permits one to retrieve physical parameters of tropospheric particle size distributions, e.g., effective radius, volume, surface-area, and number concentrations, as well as the mean complex ...

    • Microphysical particle properties derived from inversion algorithms developed in the framework of EARLINET 

      Mueller, D.; Boeckmann, C.; Kolgotin, Alexei; Schneidenbach, L.; Chemyakin, Eduard V.; Rosemann, J.; Znak, P.; Romanov, A. (2016-10-12)
      We present a summary on the current status of two inversion algorithms that are used in EARLINET for the inversion of data collected with EARLINET multiwavelength Raman lidars. These instruments measure backscatter coecients ...

    • Mineral dust observed with AERONET Sun photometer, Raman lidar, and in situ instruments during SAMUM 2006 : Shape-dependent particle properties 

      Mueller, D.; Ansmann, A.; Freudenthaler, V.; Kandler, K.; Toledano, C.; Hiebsch, A.; Gasteiger, J.; Esselborn, M.; Tesche, Matthias; Heese, B.; Althausen, D.; Weinzierl, B.; Petzold, A.; von Hoyningen-Huene, W. (2010-06)
      Nearly pure Saharan dust was observed with an Aerosol Robotic Network (AERONET) Sun photometer, several Raman and high spectral resolution lidars, and airborne in situ instruments during the Saharan Mineral Dust Experiment ...

    • Mineral dust observed with AERONET Sun photometer, Raman lidar, and in situ instruments during SAMUM 2006 : Shape-independent particle properties 

      Mueller, D.; Weinzierl, B.; Petzold, A.; Kandler, K.; Ansmann, A.; Mueller, T.; Tesche, Matthias; Freudenthaler, V.; Esselborn, M.; Heese, B.; Althausen, D.; Schladitz, A.; Otto, S.; Knippertz, P. (2010-04-10)
      Aerosol Robotic Network (AERONET) Sun photometer observations were carried out at Ouarzazate, Morocco, during the Saharan Mineral Dust Experiment (SAMUM) 2006. Data from one measurement day, 19 May 2006, are used to derive ...

    • Mineral quartz concentration measurements of mixed mineral dust/urban haze pollution plumes over Korea with multiwavelength aerosol Raman-quartz lidar 

      Mueller, D.; Mattis, I.; Tatarov, B.; Noh, Y. M.; Shin, D. H.; Shin, S. K.; Lee, K. H.; Kim, Y. J.; Sugimoto, N. (2010-10)
      We present a case study of a concentration measurement of mineral quartz immersed in East Asian urban pollution. We use a novel lidar measurement technique that uses signals from Raman scattering from quartz at ultraviolet ...

    • A Miniature Airborne Particle Classifier (APC) 

      Stopford, Chris; Kaye, Paul H.; Hirst, Edwin; Ulanowski, Zbigniew (2011-09-04)
      The single greatest source of uncertainty in the estimates of climate sensitivity to either natural or man-made changes continues to be clouds (IPCC 2001, 2007). Much of this uncertainty arises from the lack of information ...

    • Miniature, low-cost optical particle counters 

      Ulanowski, Joseph; Kaye, Paul H.; Hirst, Edwin; Wieser, Andreas; Stanley, Warren (2013)
      A range of miniature, low-cost optical particle counters for characterizing atmospheric particles has been developed. They are intended for use with disposable balloon-borne radiosondes, dropsondes or in dense ground-based ...

    • Model evaluation and ensemble modelling of surface-level ozone in Europe and North America in the context of AQMEII 

      Solazzo, Efisio; Bianconi, Roberto; Vautard, Robert; Appel, K. Wyat; Moran, Michael D.; Hogrefe, Christian; Bessagnet, Bertrand; Brandt, Jorgen; Christensen, Jesper H.; Chemel, C.; Coll, Isabelle; van der Gon, Hugo Denier; Ferreira, Joana; Forkel, Renate; Vazhappilly Francis, Xavier; Grell, George; Grossi, Paola; Hansen, Ayoe B.; Jericevic, Amela; Kraljevic, Luksa; Miranda, Ana Isabel; Nopmongcol, Uarporn; Pirovano, Guido; Prank, Marje; Riccio, Angelo; Sartelet, Karine N.; Schaap, Martijn; Silver, Jeremy D.; Sokhi, Ranjeet S.; Vira, Julius; Werhahn, Johannes; Wolke, Ralf; Yarwood, Greg; Zhang, Junhua; Rao, S. Trivikrama; Galmarini, Stefano (2012-06)
      More than ten state-of-the-art regional air quality models have been applied as part of the Air Quality Model Evaluation International Initiative (AQMEII). These models were run by twenty independent groups in Europe and ...