Presentations

2017

  • Beyond two streams: representing the complex interaction of radiation with clouds, vegetation and urban areas
    Department of Meteorology lunchtime seminar, Reading, 14 November 2017: hogan_2017_lunchtime_two_stream.pptx
  • Radiation in numerical weather prediction
    Special Topic Paper presented at 46th ECMWF Science Advisory Committee, Reading, 9 October 2017: hogan_2017_radiation_sac.pptx
  • EarthCARE synergy products: AC-TC and ACM-CAP
    Workshop on Canadian science and applications of the EarthCARE mission, McGill University, Montreal, 1 March 2017: EarthCARE_synergy_ECMWF.pptx

2016

  • What is the impact of 3D radiative transfer on the global radiation budget?
    Earth Radiation Budget Workshop, ECMWF, Reading, 21 October 2016: 2016_hogan_erbe_3d.pptx
  • Towards a fast shortwave radiance model
    Joint APRIL-CLARA-DORSY project meeting, Darmstadt, Germany, 7 April 2016: 2016_hogan_flotsam.pptx
  • What is the impact of 3D cloud radiative effects on weather and climate?
    Space & Atmospheric Physics Group, Imperial College, 19 January 2016: 2016_hogan_imperial.pptx

2015

2014

  • Equation for the microwave backscatter cross section of aggregate snowflakes using the Self-Similar Rayleigh-Gans Approximation
    AMS 14th Conference on Atmospheric Radiation, 7 July 2014: hogan_ssrg_boston_2014.pptx
  • Exploiting multiple scattering in CALIPSO measurements to retrieve liquid cloud properties
    AMS 14th Conference on Atmospheric Radiation, 9 July 2014: hogan_calipso_boston_2014.pptx
  • EarthCARE: the next step forward in global measurements of clouds, precipitation, aerosols and radiation
    Joint NCEO/CEOI-ST Science Conference, Sheffield, 25 June: hogan_EarthCARE_sheffield_nceo_ceoi.pptx
  • Radiative transfer in numerical models of the atmosphere
    ECMWF training course, 31 March to 4 April: hogan_ecmwf_radiation_lectures1and2.pptx | hogan_ecmwf_radiation_lecture4.pptx
  • Coherent backscattering effects for single particles and distributions of particles
    Workshop on scattering, clouds and climate, Mathematical Institute, Oxford, 25 March: hogan_coherent_scattering_2014.pptx
  • Overview of combined cloud retrievals from active instruments in space
    Fourth Cloud Retrieval Evaluation Workshop (CREW-4), Grainau, Germany, 4 March: hogan_crew_2014.pptx
  • Radar evaluation of convective storms in high resolution models
    Internal DYMECS meeting, Reading, 20 Feb: hogan_dymecs_2014.ppt

2013

  • Can operator-overloading ever have a speed approaching source-code transformation for reverse-mode automatic differentiation?
    14th Euro Automatic Differentiation Workshop, Oxford, 9 Dec: hogan_automatic_differentiation_2013.pptx
  • Overview of EarthCARE and UK involvement
    For use at ESA Living Planet Symposium, Edinburgh, 9-13 Sept: EarthCARE_slides.pptx
  • EarthCARE and snow
    Fourth international workshop on space-based snowfall measurements, Mammoth Lakes, California, 6 May: hogan_snow_workshop_2013.pptx
  • Evaluating high resolution models with radar
    Talk to Chinese delegation at Department of Meteorology, Reading, 10 April: hogan_dymecs_summary_2013.ppt
  • Radar evaluation of convective storms in high resolution models
    Royal Meteorological Society National Meeting, London, 20 March: hogan_dymecs_rmets_2013.ppt

2012

  • Evaluation and improvement of mixed-phase cloud schemes using radar and lidar observations
    Workshop on parametrization of clouds and precipitation across model resolutions, ECMWF, Reading, 7 November 2012: hogan_ecmwf_mixed_phase_2012.ppt
  • Progress in the DYMECS project (Dynamical and Microphysical Evolution of Convective Storms)
    COPE meeting, Reading, 25 October 2012: dymecs_cope_2012.ppt
  • Retrieving consistent profiles of clouds and rain from active instruments using a unified approach
    International Radiation Symposium, Berlin, 10 August: hogan_irs_unified_2012.ppt
  • Fast forward modelling of radar and lidar depolarization subject to multiple scattering
    International Radiation Symposium, Berlin, 6 August: hogan_irs_depol_ms_2012.ppt
  • Introduction to the DYMECS project (dynamical and microphysical evolution of convective storms)
    Met Office, Exeter, 10 July: dymecs_intro_2012.ppt
  • Retrieving consistent profiles of clouds and rain from instrument synergy
    Joint CALIPSO-CloudSat-EarthCARE workshop, Paris, 20 June: hogan_paris_workshop_2012.ppt, hogan_paris_workshop_2012.pdf
  • Fast reverse-mode automatic differentiation using expression templates in C++
    Talk to Data Assimilation Research Group, Reading, 9 May: hogan_automatic_differentiation.ppt
  • Verifying cloud and boundary-layer forecasts
    Talk at EG-CLIM COST meeting, Reading, 28 March: hogan_cloud_skill_2012.ppt
  • Clouds and their turbulent environment
    Seminar at LATMOS, University of Versailles, St-Quentin-en-Yvelines, France, 13 March
    Space & Atmospheric Physics Group, Imperial College London, 1 May: hogan_clouds_turbulence_2012.ppt
  • Reading - Met Office collaboration
    Talk to at Met Office Academic Partnership "Super-RAP" meeting, 18 Jan: Reading_Jan_2012_SuperRAP.ppt
  • The Chilbolton Observatory: Contribution to Key Science Issues
    Talk at Atmospheric Radar Forum, 5 Jan: chilbolton_radar_forum_2012.ppt

2011

  • Elements of atmospheric physics: radiation and clouds
    Lecture to NCAS Summer School, Cambridge, 15 September 2011: Hogan_NCAS_summerschool_2011.ppt
  • Grand unified algorithms: how to retrieve radiatively consistent profiles of clouds, precipitation and aerosol from radar, lidar and radiometers
    Gordon research conference on radiation and climate, 14 July 2011: hogan_gordon_2011.ppt
  • Towards unified retrievals of clouds, precipitation and aerosols from radar, lidar and radiometer observations
    Space Research Centre Seminar, Leicester University, 18 March 2011: hogan_leicester_2011.ppt
  • Evaluating and improving the representation of clouds in climate models using spaceborne radar and lidar
    ESA visit to University of Reading, 28 February 2011: hogan_nceo_esa_20110228.ppt

2010

  • Approaches for variational liquid-cloud retrievals using radar, lidar and radiometers
    Expert group on liquid cloud retrievals (EU COST meeting), Clifden, Ireland, 7 October 2010: hogan_cost_clifden.ppt
  • How accurate are the radiative properties of ice clouds derived from the CloudSat and Calipso satellites?
    National Centre for Earth Observation Conference, Leicester, 29 September 2010: hogan_nceo_2010.ppt
  • What can we learn about clouds and their representation in models from the synergy of radar and lidar observations?
    National Centre for Atmospheric Science Conference, Manchester, 5 July 2010: hogan_ncas_2010.ppt
  • Synergistic retrievals of clouds from radar, lidar and radiometers
    Workshop on assimiling satellite observations of clouds and precipitation into NWP models, ECMWF, Reading, 15 June 2010: hogan_cloud_assim_ecmwf.ppt
  • Variational cloud retrievals from radar, lidar and radiometers
    Workshop of COST Action ES0702: Integrated Ground-Based Observations of Essential Variables for Climate and Operational Meteorology EG-CLIMET, Reading, 24 March 2010: hogan_var_cost.ppt
  • Microphysics and dynamics research using long-term Doppler lidar observations
    Atmospheric System Research (ASR) Science Team meeting, vertical velocity breakout session, Bethesda, Maryland, 15 March 2010: hogan_arm_doppler_lidar.ppt
  • Faster and more accurate representation of clouds and gases in GCM radiation schemes
    Atmospheric, Oceanic and Planetary Physics seminar, Oxford University, 4 February 2010: hogan_radiation_aopp.ppt

2009

  • Cloud processes and climate
    Joint NCEO-NCAS climate meeting, Reading, 14 December 2009: hogan_ncas_nceo_clouds_climate.ppt
  • Synergistic cloud, aerosol and precipitation products: progress in RATEC
    Joint Algorithm Development for EarthCARE (JADE) meeting, ESA/ESTEC, 7 December 2009: hogan_jade_synergy.ppt
  • Objective assessment of the skill of cloud forecasts: Towards an NWP-testbed
    FASTER project kick-off meeting, Brookhaven National Laboratory, New York, 23 Nov 2009: hogan_nwp_testbed.ppt
  • Radiation - clouds/radar/radiation collaboration meeting
    Clouds/radar/radiation collaboration meeting with Met Office and ECMWF, Reading, 17 Nov 2009: hogan_radiation_collab2009.ppt
  • Faster and more accurate representation of clouds and gases in GCM radiation schemes
    Department of Meteorology lunchtime seminar, Reading, 3 November 2009: hogan_dept_radiation.ppt
  • Verification of cloud forecasts: what is the half-life of a cloud forecast and is the Equitable Threat Score equitable?
    ECMWF formal seminar, Reading, 27 October 2009: ecmwf_cloud_skill_equitable.ppt
  • The Boundary Element Method for atmospheric scattering problems
    Short talk to Radiation Group, 8 October 2009: hogan_bem.ppt
  • Observations of boundary-layer turbulence using Doppler lidar and surface fluxes
    Boundary Layer Meteorology group talk, Reading, 15 May 2009: hogan_bl_turbulence.ppt
  • Evaluating forecasts of the evolution of the cloudy boundary layer using radar and lidar observations
    Chilbolton Users' Meeting, Chilbolton, Hampshire, 13 May 2009 (lead author: Andrew Barrett): barrett_bl_cloud_evaluation.ppt
  • Why it is important that ice particles are Smarties not Gobstoppers to a radar
    Radar group talk, 29 April 2009: hogan_ice_spheroids.ppt
  • Towards unified retrievals of clouds, precipitation and aerosols
    Joint Algorithm Development for EarthCARE (JADE) meeting, ESA/ESTEC, 23 April 2009: hogan_jade_unified.ppt
  • The importance of ice particle shape and orientation for spaceborne radar retrievals
    Joint Algorithm Development for EarthCARE (JADE) meeting, ESA/ESTEC, 22 April 2009: hogan_jade_ice_spheroids.ppt
  • Polarization radar observations of dynamics, microphysics and electrification in convective clouds
    Seminar at Stony Brook University, Long Island, 16 February 2009: polarization_thunderstorms.zip
  • Quantifying the skill of cloud forecasts from the ground and from space
    Seminar at NASA Goddard Institute for Space Studies, New York, 13 February 2009: cloud_skill.ppt
  • Representing cloud structure in the radiation schemes of climate models
    Seminar at the Atmospheric Sciences Division, Brookhaven National Laboratory, Long Island, 30 January 2009;
    Seminar at the Climate and Radiation Branch, NASA Goddard Space Flight Center, Greenbelt, 4 February 2009: hogan_radiation.ppt
  • Variational retrieval combining EarthCARE radar, HSRL lidar and infrared radiometers
    Acceptance Review, CASPER (Cloud and Aerosol Synergy Products from EarthCARE Retrievals) project, ESA/ESTEC, 20 January 2009: casper_final.ppt

2008

  • Overview of CloudSat/CALIPSO/EarthCARE work at University of Reading
    Joint University/ECMWF meeting on CloudSat/CALIPSO/EarthCARE, ECMWF, Reading, 8 December 2008: hogan_ecmwf_active_inst_overview_2008.ppt
  • What is the half-life of a cloud forecast?
    Joint Reading/Met Office meeting on Clouds, Radar and Radiation, Met Office, Exeter, 17 September 2008: met_office_half_life.ppt
  • Radiation parameterization and clouds
    ECMWF Seminar: Parametrization of subgrid physical processes, ECMWF, Reading, 1 September 2008: hogan_ecmwf_radiation.ppt
  • Polarization radar observations of dynamics, microphysics and electrification in convective clouds
    CPTEC, Cachoeira Paulista, Brazil, August 2008: polarization_thunderstorms.zip
  • Radar/lidar/radiometer retrievals of ice clouds from the A-Train
    International Radiation Symposium, Foz de Iguassu, Brazil, 6 August 2008: var_cloud_irs.ppt
  • The time-dependent two-stream method for radar and lidar multiple scattering
    International Radiation Symposium, Foz de Iguassu, Brazil, 7 August 2008: multiscatter_irs.ppt
  • Clouds and climate
    NCAS strategy meeting on aerosols, clouds and climate, York, 1 May 2008: ncas_clouds_climate_hogan.ppt
  • Remote sensing of ice clouds
    Ice in the atmosphere from the micro to the global scale, Royal Meteorological Society, Manchester, 23 April 2008: hogan_ice_atrain.ppt
  • How to test a model: Lessons from Cloudnet
    ARM Science Team meeting, Norfolk, Virginia, 13 March 2008: arm_hogan_2008.ppt
  • How to distinguish rain from hail using radar: a cunning variational method
    Department of Meteorology lunchtime seminar, Reading, 22 January 2008: var_rain_hail_dept_2008.ppt

2007

  • Techniques for evaluating clouds in models using ground-based and spaceborne radar and lidar
    2nd Workshop on High Resolution Modelling, Reading, 30 Oct 2007: hogan_highres_workshop.zip
  • Observations of boundary layer turbulence using Doppler lidar and surface fluxes
    Chilbolton Users' Meeting, Chilbolton, Hampshire, 12 Sept 2007: doppler_lidar_and_fluxes.ppt
  • Towards "unified" radar/lidar/radiometer retrievals for cloud radiation studies
    33rd AMS Conference on Radar Meteorology, Cairns, Australia, 7 August 2007: hogan_var_cloud.ppt
  • Fast radar and lidar multiple scattering models for cloud retrievals
    EarthCARE Workshop, ESA/ESTEC, Noordwijk, The Netherlands, 8 May 2007: multiscatter_esa.ppt
  • Cloud and climate studies using the Chilbolton observatory
    40th Anniversary Celebration, Chilbolton Observatory, 11 April 2007: hogan_clouds_climate_chilbolton.ppt
  • The Great Channel 4 Swindle
    Weather and Climate Discussion, Department of Meteorology, Reading, 23 March 2007: channel4_swindle.ppt
  • Calipso lidar observations of Arctic and Antarctic Polar Stratospheric Clouds
    Weather and Climate Discussion, Department of Meteorology, Reading, 16 March 2007: arctic_pscs.ppt
  • Estimating cloud particle size using the moon
    Weather and Climate Discussion, Department of Meteorology, Reading, 2 March 2007: corona_wcd.ppt
  • Open problems in scattering by clouds and precipitation
    Workshop on Mathematical and Computational Methods for Direct and Inverse Electromagnetic Scattering, Department of Mathematics, Reading. 11 January 2007: hogan_scattering_problems.zip, westbrook_waves.ppt

2006

  • Use of ground-based radar and lidar to evaluate model clouds
    Workshop on parameterizing clouds in large-scale models, ECMWF, Reading, 14 November 2006: hogan_ecmwf_workshop.ppt
  • Modelling lidar and radar multiple scattering
    Radar Group informal seminar, Reading, 27 October 2006: multiscatter.ppt
    Informal numerical analysis seminar, Department of Mathematics, Reading, 23 November 2006: multiscatter_maths.ppt
  • Variational methods for retrieving cloud, rain and hail properties from combined radar, lidar and radiometers
    Met Office, Exeter, 15 September 2006: met_office_var_rain_hail_cloud.ppt
    NCAR, Boulder, 18 July 2006: var_rain_hail_cloud.ppt
  • The effect of horizontal photon transport on the radiative forcing of contrails
    12th AMS conference on Atmospheric Radiation, Madison, 12 July 2006: 3D_contrails.ppt
  • A variational cloud retrieval scheme combining radar, lidar and radiometer observations
    12th AMS conference on Atmospheric Radiation, Madison, 11 July 2006: var_cloud.ppt
  • A quick look at CloudSat
    Weather and Climate Discussion, Department of Meteorology, Reading, 23 June 2006: cloudsat.ppt
  • Quantifying subgrid cloud structure and representing it in GCMs
    Workshop on cloud inhomogeneity and radiation, Reading, 8 June 2006: cloud_inhomogeneity.ppt
  • Implementation of multiple regions in Edwards-Slingo
    Workshop on cloud inhomogeneity and radiation, Reading, 8 June 2006: shadow_solution.ppt
  • A variational scheme for retrieving rainrate and hail intensity from polarimetric radar
    Chilbolton Users' Meeting, Chilbolton, Hampshire, 7 June 2006: var_rain_hail.ppt
  • Scaling properties of cirrus clouds
    EGU General Assembly, Vienna, 5 April 2006: scaling_properties_cirrus.zip

2005

2004

2003

  • Using radar and lidar to improve the representation of clouds in model
    University of Washington, Seattle, 17 Nov 2003: seattle2003.zip
  • Active remote sensing of the small-scale structure of humidity and cloud water content
    GEWEX workshop on 3D clouds and radiative transfer, Victoria, British Columbia, Canada, 14 Nov 2003: victoria2003.zip
  • PDFs of humidity and cloud water content from Raman lidar and cloud radar
    RMS Conference, Norwich, 5 Sept 2003: pdfs2003.ppt
  • Radar-aircraft observations of mixed-phase cloud (Paul Field lead author)
    RMS Conference, Norwich, 4 Sept 2003: Field_mixed_phase.zip
  • Lidar observations of mixed phase clouds
    RMS Physical Processes group meeting, UMIST, 4th June 2003: mixed_phase2003.ppt; version 2
  • Parameterizing ice cloud inhomogeneity and the overlap of inhomogeneities using cloud radar data
    EGS conference, 9th April 2003: inhomogeneity_egs2003.ppt
  • Blind tests of radar/lidar retrievals in ice clouds: Assessment in terms of radiative fluxes
    CloudSat Science meeting, Broomfield Colorado, 5th March 2003: blindtest2003a.ppt
  • Blind tests of radar/lidar retrievals: Assessment of errors in terms of radiative flux profiles
    ESA "Retrieval algorithms for EarthCARE" meeting, Bonn, 17th February 2003: blindtest2003.ppt
  • Integrated lidar backscatter: Quantifying the occurrence of supercooled water and specular reflection
    ESA "Retrieval algorithms for EarthCARE" meeting, Bonn, 17th February 2003: specular2003.ppt

2002

  • How well are clouds represented in forecast and climate models? An assessment using long-term cloud radar and lidar observations
    Scotish Centre, Royal Meteorological Society, Edinburgh, 13th December 2002: edinburgh2002.zip
  • Polarimetric radar observations of storm electrification and lightning
    2nd European Radar Meteorology Conference, Delft, The Netherlands, November 2002: lightning2002.zip

Miscellaneous

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