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Now showing items 61-80 of 432
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Cloud chamber laboratory investigations into scattering properties of hollow ice particles
Smith, Helen; Connolly, Paul; Baran, Anthony; Hesse, Evelyn; Smedley, Andrew; Webb, Ann (2015-05-01)Measurements are presented of the phase function, P11, and asymmetry parameter, g, of five ice clouds created in a laboratory cloud chamber. At −7 °C, two clouds were created: one comprised entirely of solid columns, and ... -
Cloud characterization using a particle-counter dropsonde
Ulanowski, Zbigniew; Kaye, Paul; 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 ... -
Cloud Ice Properties: In Situ Measurement Challenges
Baumgardner, Darrel; Abel, Steve; Axisa, Duncan; Cotton, Richard; Crosier, Jonathan; Field, P.R.; Gurganus, Colin; Heymsfield, Andrew J.; Korolev, Alexei; Kraemer, Martina; Lawson, Paul; McFarquhar, Greg; Ulanowski, Zbigniew; Um, Junshik (2017-04-10)Understanding the formation and evolution of ice in clouds requires detailed information on the size, shape, mass and optical properties of individual cloud hydrometeors and their bulk properties over a broad range of ... -
Co-ordinated Airborne Studies in the Tropics (CAST)
Harris, N. R. P.; Carpenter, L. J.; Lee, J. D.; Vaughan, G.; Filus, M. T.; Jones, R. L.; OuYang, B.; Pyle, J. A.; Robinson, A. D.; Andrews, S. J.; Lewis, A. C.; Minaeian, J.; Vaughan, A.; Dorsey, J. R.; Gallagher, M. W.; Le Breton, M.; Newton, R.; Percival, C. J.; Ricketts, H. M. A.; Baugitte, S. J-B.; Nott, G. J.; Wellpott, A.; Ashfold, M. J.; Flemming, J.; Butler, R.; Palmer, P. I.; Kaye, P. H.; Stopford, C.; Chemel, C.; Boesch, H.; Humpage, N.; Vick, A.; MacKenzie, A. R.; Hyde, R.; Angelov, P.; Meneguz, E.; Manning, A. J. (2017-01-23)The main field activities of the CAST (Co-ordinated Airborne Studies in the Tropics) campaign took place in the West Pacific in January/February 2014. The field campaign was based in Guam (13.5°N, 144.8°E) using the UK ... -
Co-ordinated vertical profiling of Saharan dust over western and central Europe with a continental lidar network : The 11-16 October 2001 outbreak
Ansmann, Albert; Bosenberg, J.; Chaikovsky, Anatoly; Eixmann, R.; Freudenthaler, Volker; Garcia-Vizcaino, D.; Komguem, L.; Linne, Holger; Matthias, M.; Mattis, I.; Mitev, Valentin; Mueller, D.; Munoz, C.; Nickovic, S.; Pelon, J.; Sauvage, L.; Sobolewsky, P.; Srivastava, M.K.; Vaughan, G.; Wandinger, U.; Wiegner, M. (INST TROPICAL MEDICINE ROTTERDAM - LEIDEN, 2003)The spread of mineral particles over southwestern, western, and central Europe resulting from a strong Saharan dust outbreak in October 2001 was observed with the European Aerosol Research Lidar Network (EARLINET). For the ... -
A cokriging based approach to reconstruct air pollution maps, processing measurement station concentrations and deterministic model simulations
Singh, V.; Carnevale, C.; Finzi, G.; Pisoni, E.; Volta, M. (2011-06-01)One of the aims of regional Environmental Authorities is to provide citizens information about the quality of the atmosphere over a certain region. To reach this objective Environmental Authorities need suitable tools to ... -
Columnar aerosol optical and radiative properties according to season and air mass transport pattern over East Asia
Noh, Young M.; Mueller, D.; Lee, Hanlim; Lee, Kwonho; Kim, Young Joon (2012-08)The column-integrated optical and radiative properties of aerosols in the downwind area of East Asia were investigated based on sun/sky radiometer measurements performed from February 2004 to June 2005 at Gwangju (35.23A ... -
Comparative analysis of meteorological performance of coupled chemistry-meteorology models in the context of AQMEII phase 2
Brunner, Dominik W.; Savage, Nick H.; Jorba, Oriol; Eder, Brian K.; Giordano, Lea; Badia, Alba; Balzarini, Alessandra; Baró, Rocío; Bianconi, Roberto; Chemel, C.; Curci, Gabriele; Forkel, Renate; Jiménez-Guerrero, Pedro; Hirtl, Marcus; Hodzic, Alma; Honzak, Luka; Im, Ulas; Knote, Christoph; Makar, Paul A.; Manders-Groot, Astrid; Van Meijgaard, Erik; Neal, Lucy S.; Pérez, Juan Luis Canovas; Pirovano, Guido; San José, Roberto; Schro¨der, Wolfram; Sokhi, R.S.; Syrakov, Dimiter E.; Torian, Alfreida; Tuccella, Paolo; Werhahn, Johannes; Wolke, Ralf; Yahya, Khairunnisa; Žabkar, Rahela; Zhang, Yang; Hogrefe, Christian; Galmarini, Stefano (2015-08)Air pollution simulations critically depend on the quality of the underlying meteorology. In phase 2 of the Air Quality Model Evaluation International Initiative (AQMEII-2), thirteen modeling groups from Europe and four ... -
Comparison and complementary use of in situ and remote sensing aerosol measurements in the Athens Metropolitan Area
Vratolis, S.; Fetfatzis, P.; Argyrouli, A.; Soupiona, O.; Mylonaki, M.; Maroufidis, J.; Kalogridis, A. C.; Manousakas, M.; Bezantakos, S.; Binietoglou, I.; Labzovskii, L. D.; Solomos, S.; Papayannis, A.; Močnik, G.; O’ Connor, E.; Müller, D.; Tzanis, C. G.; Eleftheriadis, K. (2020-05-01)In the summer of 2014 in situ and remote sensing instruments were deployed in Athens, in order to study the concentration, physical properties, and chemical composition of aerosols. In this manuscript we aim to combine the ... -
Comparison of optical and microphysical properties of pure Saharan mineral dust observed with AERONET Sun photometer, Raman lidar, and in situ instruments during SAMUM 2006
Mueller, D.; Lee, K-H.; Gasteiger, J.; Tesche, Matthias; Weinzierl, B.; Kandler, K.; Mueller, T.; Toledano, C.; Otto, S.; Althausen, D.; Ansmann, A. (2012-04-14)The Saharan Mineral Dust Experiment (SAMUM) 2006, Morocco, aimed at the characterization of optical, physical, and radiative properties of Saharan dust. AERONET Sun photometer, several lidars (Raman and high-spectral-resolution ... -
Comparison of Raman Lidar Observations of Water Vapor with COSMO-DE Forecasts during COPS 2007
Herold, Christian; Althausen, Dietrich; Mueller, D.; Tesche, Matthias; Seifert, Patric; Engelmann, Ronny; Flamant, Cyrille; Bhawar, Rohini; Di Girolamo, Paolo (2011-12)Water vapor measurements with the multiwavelength Raman lidar Backscatter Extinction Lidar-Ratio Temperature Humidity Profiling Apparatus (BERTHA) were performed during the Convective and Orographically-induced Precipitation ... -
Comparison of statistical and dynamical downscaling methods for seasonal-scale winter precipitation predictions over north India
Tiwari, P. R.; S. C. Kar; Mohanty, U. C.; Sagnik Dey; P. Sinha; M. S. Shekhar; Sokhi, Ranjeet (2018-11-12)The main aim of the present study is to analyse the capabilities of two downscaling approaches (statistical and dynamical) in predicting wintertime seasonal precipitation over north India. For this purpose, a canonical ... -
Comparison of the radiative impact of aerosols derived from vertically resolved (lidar) and vertically integrated (Sun photometer) measurements : Example of an Indian aerosol plume
Wagner, F.; Mueller, D.; Ansmann, A. (2001-10-16)Radiative forcing calculations both at the top of the atmosphere (TOA) and at the surface were done for vertically varying particle properties and their approximation through vertically constant properties. The data sets ... -
Continuous bio-aerosol monitoring in a tropical environment using a UV fluorescence and light scattering instrument
Stanley, W.; Kaye, Paul H.; Foot, V.E.; Barrington, S.J.; Gallagher, M.; Gabey, A. (University of Hertfordshire, 2008)This paper describes an instrument designed to achieve the continuous monitoring of ambient bio-aerosol concentrations. The instrument is a compact, relatively low-cost, UV aerosol spectrometer that monitors and classifies ... -
Correction for Sparks et al., Detection of circular polarization in light scattered from photosynthetic microbes [fig 1]
Sparks, W.B.; 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 (2009-06-30) -
Correction to “Volcanic aerosol layers observed with multiwavelength Raman lidar over central Europe in 2008–2009”
Mattis, Ina; Seifert, Patric; Mueller, D.; Tesche, Matthias; Hiebsch, Anja; Kanitz, Thomas; Schmidt, Joerg; Finger, Fanny; Wandinger, Ulla; Ansmann, Albert (2010-10-13) -
COVID-19 lockdown induced changes in NO2 levels across India observed by multi-satellite and surface observations
Biswal, Akash; Singh, Vikas; Singh, Shweta; Sokhi, Ranjeet; Kesarkar, Amit P.; Ravindra, Khaiwal; Chipperfield, Martyn P.; Dhomse, Sandip S.; Pope, Richard J.; Singh, Tanbir; Mor, Suman (2021-04-01)We have estimated the spatial changes in NO 2levels over different regions of India during the COVID-19 lockdown (25 March-3 May 2020) using the satellite-based tropospheric column NO 2observed by the Ozone Monitoring ... -
Daytime operation of a pure rotational Raman lidar by use of a Fabry-Perot interferometer
Arshinov, Y.; Bobrovnikov, S.; Serikov, I.; Ansmann, A.; Wandinger, U.; Althausen, D.; Mattis, I.; Mueller, D. (2005-06-10)We propose to use a Fabry-Perot interferometer (FPI) in a pure rotational Raman lidar to isolate return signals that are due to pure rotational Raman scattering from atmospheric nitrogen against the sky background. The ... -
Decoherence: phases washed out or smeared recoil drift
Steuernagel, O. (1996) -
Depolarization ratio profiling at several wavelengths in pure Saharan dust during SAMUM 2006
Freudenthaler, Volker; Esselborn, Michael; Wiegner, Matthias; Heese, Birgit; Tesche, Matthias; Ansmann, Albert; Mueller, D.; Althausen, Dietrich; Wirth, Martin; Fix, Andreas; Ehret, Gerhard; Knippertz, Peter; Toledano, Carlos; Gasteiger, Josef; Garhammer, Markus; Seefeldner, Andmeinhard (2009-02)Vertical profiles of the linear particle depolarization ratio of pure dust clouds were measured during the Saharan Mineral Dust Experiment (SAMUM) at Ouarzazate, Morocco (30.9 degrees N, -6.9 degrees E), close to source ...