Scientific Calendar Event

An ICTP Hybrid Meeting


Organized convective systems are often responsible for high impact precipitation extremes, and changes in convective organization have the potential to amplify or dampen future climate change. This workshop will examine our present knowledge of convective organization in models and observations.

Convective organization is of special relevance to both weather and climate. Despite representing only 20% of cloud systems, mesoscale organised convective systems have been shown to provide over 80% of surface precipitation in the West Africa monsoon. Convective organised systems are also frequently associated with precipitation extremes.

Changes in convective organisation and clustering in future may represent a feedback on climate that is poorly represented, or even absent, in current generation models. Present efforts to improve our understanding include observational studies, highly idealized models, limited-area convective permitting models, and global models which use parameterizations or are operating at convective permitting resolutions in state-of-the-art projects such as Nextgems.

Following on from the 2nd cloud organisation workshop (WCO2) that took place in Utrecht in 2022, this workshop aims to bring together all these tools to assess our present understanding of convective organization.

  • Convective self-aggregation in idealized experiments
  • Precipitation extremes associated with organized convection
  • Using idealized models to improve our understanding of aggregation
  • How can we better use observations?
  • Impact of aggregation and organization changing on climate sensitivity
  • Aggregation in global cloud resolving model experiments

S. BONY, Laboratoire de Meteorologie Dynamique (LMD), France
A. FINK, Karlsruhe Institute of Technology (KIT) , Germany
I. KOREN, Weizmann Institute of Science, Rehovot, Israel
K. NUNEZ OCASIO, National Center for Atmospheric Research, USA
J. RADTKE, University of Hamburg/MPI-M, Germany
A. SEMIE, Addis Ababa University, Ethiopia
P. SIEBESMA, Delft University of Technology, Netherlands
A. STIRLING, Met Office, UK
J. WINDMILLER, Max Planck Institute for Meteorology, Germany

Call for Contributed Abstracts: All applicants are encouraged to submit an abstract for a poster presentation and/or a contributed talk. Abstract templates are available below for download.

Program: All participants are encouraged to contribute by either a poster or a talk (approximately 15 min + discussion). These contributions will be broadly grouped into the themes by the program organisers.  Please indicate when applying your preference for a poster or oral presentation if you have one.

Grants: A limited number of grants are available to support the attendance of selected participants, with priority given to participants from developing countries. There is no registration fee.

Information: Some information regarding the ICTP campus can be found here and transportation here.

The workshop dinner: A group buffet style dinner will be held on the Wednesday evening during the event.  We hope you will all join and enjoy the Trieste weather by the sea.

WWF activities: some information can be found in the Material section below.

This workshop has received support from The Branco Weiss Fellowship - Society in Science, administered by ETH Zürich.
Go to day
  • Monday, 4 September 2023
    • 08:30 - 09:00
      • 08:30 Registration formalities for participants attending the training 30' ( Adriatico Guest House - Registration desk (Lower Level 1) )
        Upon arrival, Visitors not staying in the ICTP Guest Houses, are kindly requested to complete registration formalities at the Adriatico Guest House (Lower level). The Registration Desk will be open from 8.30 to 9.00 and from 13.30 to 14.30.
    • 09:00 - 13:30 Training session
      Location: Adriatico Guest House - Informatics Laboratory
      • 09:00 Modes of convection: Turbulence, Stratocumulus, trade cumulus and deep convection 30'
        Speaker: Steven BOEING (University of Leeds, UK)
        Material: Slides
      • 09:30 Processes/mechanisms/models for self-organization of convection, incl. deep convective aggregation, shallow scale growth, cold-pools (colliding circles etc) 20'
        Speaker: Franziska GLASSMEIER (TU DELFT, Netherlands)
        Material: Slides
      • 09:50 Deep convection organisation idealized and real: from self aggregation through squall lines to hurricanes and tropical coupled waves 20'
        Speaker: Adrian TOMPKINS (ICTP, Italy)
        Material: Slides
      • 10:10 Cold pool models and their role in organisation 20'
        Speaker: Jan HAERTER (Niels Bohr Institute, Copenhagen University, Denmark)
      • 10:30 Break 30'
      • 11:00 Identifying convection organisation in Satellite imagery 2h0'
        Speaker: Leif DENBY (Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Denmark), Irene KRUSE (NBI, Denmark), Benjamin Hernandez (TU DELFT, Netherlands)
        Material: Slides
    • 13:30 - 14:30
      • 13:30 Registration formalities for the main conference 1h0'
    • 14:30 - 16:15
      • 14:30 Opening remarks 15'
      • 14:45 On the role of mesoscale vertical motions in the organisation of shallow and deep convection 30'
        Speaker: Sandrine BONY (C.N.R.S.- Laboratoire de Météorologie Dynamique (LMD), UPMC, France)
      • 15:15 Clouds in Focus: Assessing Cumulus Cloud Characteristics using Camera Observations and Large-Eddy Simulations 15'
        Speaker: Yannick BURCHART (Institute of Geophysics and Meteorology University of Cologne, Germany)
      • 15:30 Seeing doldrums from space 15'
        Speaker: Geet GEORGE (TU Delft Faculty of Civil Engineering and Geosciences, Netherlands)
      • 15:45 Discussion 15'
      • 16:00 Coffee break 15'
        Lower level
    • 16:00 - 18:00
      • 16:00 Poster pitches 15'
      • 16:15 Poster session 1h45'
        Material: Slides
    • 18:30 - 20:30
      • 18:30 Welcome Reception 2h0'
        All participants are cordially invited to the Welcome Reception.
  • Tuesday, 5 September 2023
    • 09:00 - 11:00 Convective Self-Aggregation pt. I
      • 09:00 Influence of the organization of deep convection on the radiation budget and precipitation extremes in the tropics 30'
        Speaker: Addisu Gezahegn SEMIE (Addis Ababa University, Ethiopia)
        Material: Slides
      • 09:30 Observational study of the coupling between deep convection, clear sky regions and mesoscale circulations in the ITCZ 15'
        Speaker: Basile POUJOL (Laboratoire de Météorologie Dynamique, Institut Pierre Simon Laplace, Sorbonne Université, France)
      • 09:45 The Unreasonable Efficiency of Total Rain Evaporation Removal in Triggering Convective Self-Aggregation 15'
        Speaker: Yi-Ling HWONG (Institute of Science and Technology Austria (ISTA), Austria)
        Material: Slides
      • 10:00 Self-Organization of tropical convection: Role of the Free Convection Distance 15'
        Speaker: Alejandro CASALLAS GARCIA (ICTP, Italy)
      • 10:15 Discussion 15'
      • 10:30 Coffee break 30'
    • 11:00 - 12:30 Convective Self-Aggregation II, RCE
      • 11:00 Numerical diffusion and turbulent mixing in convective self-aggregation 15'
        Speaker: Lorenzo SILVESTRI (University of Perugia, Italy)
        Material: Slides
      • 11:15 A dimensionless parameter for predicting the onset of self-aggregation in a stochastic reaction-diffusion model of tropical radiative-convective equilibrium 15'
        Speaker: Giovanni BIAGIOLI (University of Trieste, Italy)
      • 11:30 Competing Effect of Radiative and Moisture Feedback in Convective Aggregation States in Two CRMs 15'
        Speaker: Miriam SARACENI (University of Perugia, Italy)
        Material: Slides
      • 11:45 Relationships between clouds, circulation, and radiation in long-channel radiative convective equilibrium simulations 15'
        Speaker: Peter Gordon HILL (University of Reading, UK)
      • 12:00 The Role of Surface Thermodynamic Gradients on the ITCZ Properties in Reanalyses and Idealised Simulations over an Aquapatch 15'
        Speaker: Maxime COLIN (Leibniz Centre for Tropical Marine Research (ZMT), Germany)
        Material: Slides
      • 12:15 Discussion 15'
    • 14:30 - 18:00 Stratocumulus Cell Organization
      • 14:30 Aerosol-stratocumulus interactions as data-driven dynamical system 15'
        Speaker: Franziska GLASSMEIER (TU DELFT, Netherlands)
      • 14:45 Correlating Stratocumulus Organizational Characteristics and Aerosol-Cloud Interactions in LES and SCM 15'
        Speaker: Xiaoli ZHOU (Chemical Sciences Laboratory, NOAA, USA)
      • 15:00 High-resolution Coupled Mesoscale to Microscale Simulations of Mixed-Phase Convective Clouds Observed during the Cold-Air Outbreaks in the Marine Boundary Layer Experiment (COMBLE) 15'
        Speaker: Branko KOSOVIC (National Center for Atmospheric Research, USA)
        Material: Slides
      • 15:15 Wind, Rain, and the Closed-to-Open MCC Transition 15'
        Speaker: Ryan EASTMAN (University of Washington, USA)
      • 15:30 Convective rolls and cells, momentum transport and wind turning in shear and buoyancy driven atmospheric boundary layers 15'
        Speaker: Raymond Stephan DE ROODE (Delft University of Technology, Netherlands)
      • 15:45 Discussion 15'
      • 16:00 Coffee break 30'
      • 16:30 Understanding and Modeling Mesoscale Convective Systems and related Precipitation Extremes in West Africa: Where do we stand? 30'
        Speaker: Andreas FINK (Institute of Meteorology and Climate Research, Germany)
        Material: Slides
      • 17:00 Mesoscale Convective Systems Modulated by Convectively Coupled Equatorial Waves 15'
        Speaker: Yuan-Ming CHENG (Cooperative Institute for Research in Environmental Sciences (CIRES) / NOAA Physical Sciences Laboratory, USA)
      • 17:15 Forecasting precipitation in Tropical West Africa 15'
        Speaker: Felix REIN (Karlsruher Institut für Technologie Institut für Meteorologie und Klimaforschung, Germany)
      • 17:30 Electrical activity prediction in model WRF-ELEC using machine learning Techniques 15'
        Speaker: Melina Yasmin LUQUE (University of Cordoba, Argentina)
        Material: Slides
      • 17:45 Discussion 15'
  • Wednesday, 6 September 2023
    • 09:00 - 11:00 Shallow Convective Organization pt. I
      • 09:00 On the relationship between precipitation and spatial organization in the trades 30'
        Speaker: Jule RADTKE (University of Hamburg, Germany)
        Material: Slides
      • 09:30 The sensitivity of cloud organisation to environmental mesoscale heterogeneities: the case of Flower trade-wind clouds 15'
        Speaker: Thibaut DAUHUT (CNRS and Univ. Toulouse, France)
      • 09:45 A new conceptual picture of the trade-wind transition layer 15'
        Speaker: Anna Lea ALBRIGHT (Harvard University, USA)
        Material: Slides
      • 10:00 EUREC4A-MIP: A Model Intercomparison Project on Mesoscale Organisation of shallow cumulus clouds in a present and future climate 15'
        Speaker: Anne Pier SIEBESMA (Delft University of Technology Geoscience and Remote Sensing Atmospheric Physics, Netherlands)
      • 10:15 Discussion 15'
      • 10:30 Group photo 5'
      • 10:35 Coffee break 25'
    • 11:00 - 12:30 Shallow Convective Organization pt. II
      • 11:00 Diurnally driven scaling properties of tradewind cloud fields: an analytical and geometrical approach to mesoscale turbulence 15'
        Speaker: Salima GHAZAYEL (University of Cologne, Germany)
      • 11:15 Investigating the spatial clustering of convective thermals in large-eddy simulations of shallow-to-deep convective transitions 15'
        Speaker: Irene BARTOLOME GARCIA (Faculty of Mathematics and Natural Sciences, Institute of Geophysics and Meteorology, University of Cologne, Germany)
      • 11:30 Mesoscale organization of shallow convection under different aerosol concentrations 15'
        Speaker: Hauke SCHULZ (University of Washington, USA)
      • 11:45 The role of momentum mixing in shallow cloud organisation 15'
        Speaker: Alessandro Carlo Maria SAVAZZI (Delft University of Technology, Netherlands)
        Material: Slides
      • 12:00 The diurnal cycle of the trade winds in the presence of (un)organized shallow convection 15'
        Speaker: Louise NUIJENS (Faculty of Civil Engineering and Geosciences, Delft University of Technology, Netherlands)
      • 12:15 Discussion 15'
    • 14:15 - 15:45 Shallow Convective Organization pt. III
      • 14:15 Convective steady state (CSS) as a baseline for shallow cloud organization 30'
        Speaker: Ilan KOREN (Weizmann Institute of Science, Israel)
      • 14:45 Shallow circulations rooted in shallow convection across the trade-wind mesoscales 15'
        Speaker: Martin JANSSENS (Wageningnen University & Research, Netherlands)
        Material: Slides
      • 15:00 Organized patterns in greenCu; continental shallow convective clouds 15'
        Speaker: Tom DROR (Weizmann Institute of Science, Israel)
      • 15:15 Evolution of Cloud Production across Trade Wind Mesoscale Morphology Types 15'
        Speaker: Isabel Louise MCCOY (University of Colorado Boulder, CIRES and NOAA Chemical Sciences Laboratory, USA)
      • 15:30 Discussion 15'
    • 20:00 - 22:00
      • 20:00 Dinner Reception 2h0'
        details to be announced
  • Thursday, 7 September 2023
    • 09:00 - 11:00 Deep Convective Organization
      • 09:00 Organization of deep convection in the Atlantic ITCZ 30'
        Speaker: Julia Miriam WINDMILLER (Max Planck Institute for Meteorology, Germany)
      • 09:30 Analyzing the ability to identify convective organization by indices 15'
        Speaker: Giulio MANDORLI (Institut Pierre-Simon Laplace (IPSL) / Laboratoire de Meteorologie Dynamique (LMD), France)
        Material: Slides
      • 09:45 Atmosphere-Ocean Coupled Energy Budgets of Shallow and Deep Tropical Convective Discharge-Recharge Cycles 15'
        Speaker: Brandon WOLDING (Cooperative Institute for Research in Environmental Sciences (CIRES) / NOAA PSL, USA)
        Material: Slides
      • 10:00 Impact of the mesoscale organization of deep convection on the tropospheric humidity and vapor isotopic composition: satellite observations, cloud-resolving models and general circulation models 15'
        Speaker: Camille RISI (LMD/IPSL, France)
        Material: Slides
      • 10:15 Discussion 15'
      • 10:30 Coffee break 30'
    • 11:00 - 12:30 MCSs
      • 11:00 TAMS: A Tracking, Classifying, and Precipitation-Assigning Algorithm for Mesoscale Convective Systems in Simulated and Satellite-Derived Datasets 30'
        Speaker: Kelly Marie NUNEZ OCASIO (National Center for Atmospheric Research, USA)
        Material: Slides
      • 11:30 Super Clausius Clapeyron increase in MCS extreme rainfall related to increased MCS convective fraction with temperature over Europe 15'
        Speaker: Nicolas DA SILVA (Leibniz Center for Tropical Marine Research, Integrated Modelling, Germany)
        Material: Slides
      • 11:45 Investigating Life Cycle of Mesoscale Convective Systems using global high resolution simulations and artificial intelligence 15'
        Speaker: Sophie ABRAMIAN (Laboratoire de Météorologie Dynamique, France)
      • 12:00 Life cycle resolved organization of deep convection in the cloud shield of tropical convective systems using satellite observations 15'
        Speaker: Thomas FIOLLEAU (LEGOS, France)
      • 12:15 Discussion 15'
    • 14:30 - 16:15 Cold pools
      • 14:30 Unravelling the convective controls on organisation one process at a time 30'
        Speaker: Alison Janet STIRLING (Met Office Foundation Science Atmospheric Processes and Parametrizations, UK)
      • 15:00 Characteristics of Station-Derived Convective Cold Pools Over Tropical Africa 15'
        Speaker: Jannik HOELLER (Leibniz Centre for Tropical Marine Research, Integrated Modelling, Germany)
      • 15:15 Characterizing Trade-wind Cold Pool ‘Cloud Holes’ from the Barbados Cloud Observatory 15'
        Speaker: Nina ROBBINS BLANCH (University of Hamburg, Germany)
      • 15:30 Discussion 30'
      • 16:00 Coffee break 15'
        Lower level
    • 16:15 - 18:15
      • 16:15 Poster session 2h0'
  • Friday, 8 September 2023
    • 09:00 - 11:00 Convection buffet
      • 09:00 Machine learning and clouds: past, present and future? 30'
        Speaker: Leif DENBY (Danish Meteorological Institute, Denmark)
      • 09:30 Sensible heat fluxes control cloud trail strength 15'
        Speaker: Christopher Earl HOLLOWAY (University of Reading, UK)
        Material: Slides
      • 09:45 Capturing the diversity of mesoscale trade wind cumuli using complementary approaches from self-supervision 15'
        Speaker: Dwaipayan CHATTERJEE (Institute for Geophysics and Meteorology, University of Cologne, Germany)
      • 10:00 A parameterization for sub-grid scale evaporation-driven cold pools; Impacts on simulating squall lines over the Amazon Basin 15'
        Speaker: Saulo RIBEIRO DE FREITAS (National Institute for Space Research (INPE), Brazil)
        Material: Slides
      • 10:15 Discussion 15'
      • 10:30 Coffee break 30'
    • 11:00 - 12:30 Extreme Events
      • 11:00 Complexity in Colombian precipitation extremes from a non-extensive approach 15'
        Speaker: Isabel Cristina HOYOS RINCON (Universidad del Quindio, Colombia)
        Material: Slides
      • 11:15 Extreme Precipitation Events over the Mexican coast of the tropical Eastern Pacific: Synoptic precursors and WRF modeling 15'
        Speaker: Victor TORRES (Instituto de Ciencias de la Atmosfera y Cambio Climatico - Universidad Nacional Autonoma de Mexico, Mexico)
      • 11:30 Mesoscale convective systems differences causing precipitation extremes on separate scales 15'
        Speaker: Benjamin FILDIER (Laboratoire de Météorologie Dynamique, Ecole Normale Supérieure, France)
      • 11:45 Intensification of tropical precipitation extremes from more organized convection 15'
        Speaker: Jiawei BAO (Max Planck Institute for Meteorology, Germany)
      • 12:00 Reasonable worst-case scenarios from ensemble rainfall forecasts and their use in surface water flood forecasting 15'
        Speaker: Ben MAYBEE (Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, UK)
        Material: Slides
      • 12:15 Closing remarks 15'