Below are the slides from the workshop. A pdf of the schedule can be found here:­

Monday 15 July 2019

09:00-09:30 Welcome to CPPC2019

Alison Stirling

Chair: Penelope Maher
09:30 – 12:00 Convection scheme progress
09:30 Still some convection developments in the IFS

Peter Bechtold and Sylvie Malardel

09:50 Current Developmental Activity on the Grell-Freitas Cumulus Parameterization Including the Addition of Number Concentrations and Storm Motion

Hannah Barnes, Georg Grell, Saulo Freitas, Haiqin Li, Keren Rosado and Gregory Thompson

10:10 On improving microphysics in convection parametrizations

Richard Forbes

10:30 – 11:00 Coffee and Tea Break
Chair: Alison Stirling
11:00 Mass Flux Approaches to Convection Parameterization: Impact of a Unified Convection Scheme (UNICON) on Global Climate in CMIP6

Sungsu Park, Invited

11:35 Why use a deep convective parametrization at 2.5 km?

Danahé Paquin-Ricard, Lubos Spacek, Jason A. Milbrandt, Paul A. Vaillancourt and Stéphane Bélair

11:55 A New Generalised Mass-flux Convection Scheme for the Met Office Unified Model

Michael Whitall

12:15 – 13:15 Lunch (all posters to be put up)
Chair: Christopher Holloway
13:15 Ecology of entropic entities, tensioned by telos

Brian Mapes, Invited

13:50 – 15:10 Objective frameworks for understanding scheme behaviour
13:50 HIGH-resolution simulations to improve and TUNE boundary-layer cloud parameterizations, the HIGH-TUNE project

Fleur Couvreux, Frederic Hourdin, Najda Villefranque, Richard Fournier, Romain Roehrig, Catherine Rio, Daniel Williamson and Victoria Volodina

14:10 Convection parameterization in the CNRM climate model: calibration and structural limits

Romain Roehrig, Fleur Couvreux and Daniel Williamson

14:30 Using a cloud-resolving model to diagnose the effects of different wind shear profiles on deep convective cloud fields

Mark Muetzelfeldt, Robert Plant, Peter Clark and Alison Stirling

14:50 Exploring uncertainty in model representation of atmospheric convection through Universal Structural Parameterisation

Hugo Lambert, Peter Challenor, Richard Keane and Mark Webb

15:10 – 15:40 Coffee and Tea Break
Chair: Todd Jones
15:40 – 17:00 Convection interactions
15:40 The role of the boundary layer when deep convection is very active: Forcing or response?

David Randall

16:00 The role of interactive SST in the cloud-resolving simulations of aggregated convection

Chien-Ming Wu and Yan-Ting Chen

16:20 A simple model of a balanced boundary layer coupled to a large-scale convective circulation

Robert Beare and Michael Cullen

16:40 FLEX-UM: The Flexible Model Framework for the UK Met Office Unified Model

Penelope Maher, Paul Earnshaw and Geoffrey Vallis

Monday’s Poster Presentations

101 A two-fluid single-column model of the convective boundary layer: improvements to and physics John Thuburn and Georgios Efstathiou
102 Parameterization of the perturbation pressure in a unified turbulence-convection framework Jia He, Yair Cohen and Tapio Schneider
103 Exploring the sensitivity of convection to moisture using the idealised UM Sally Lavender, Alison Stirling, Rachel Stratton and Michael Whitall
104 Unified parameterization of boundary layer clouds and turbulence based on two prognostic turbulence energies Ivan Bastak Duran and Juerg Schmidli
105 The role of the cold pool scheme in convective memory in a hierarchy of models, and its impact on precipitation frequency Maxime Colin, Jean-Yves Grandpeix, Sandrine Bony, Steven Sherwood
106 Linking stochasticity of convection to large-scale vertical velocity to improve Indian summer monsoon simulation in the NCAR CAM5 Yong Wang, Guang Zhang and Yiquan Jiang
107 The balance and interaction of convective parametrization and microphysics scheme Taro Anzai, Masashi Ujiie and Hiroshi Kusabiraki
108 Simulating clouds using a massively parallel parcel-based framework Steven Böing, Gordon Gibb, Nick Brown, Michèle Weiland and David Dritschel
109 Evaluation of heavy rain events over India during the southwest summer monsoon using high resolution Global Forecast System suite (GFS T1534 and GEFS T1534) Snehlata Tirkey, Parthasarathi Mukhopadhyay, R Phani Murali Krishna, Medha Deshpande, Malay Ganai, Tanmoy Goswami, Sahadat Sarkar, Radhika Kanase, Mata Mahakur and Kumar Roy
110 Cold pools and the organization of tropical convection in global cloud-system resolving simulations Steven Krueger
111 Prognostic turbulence parametrization with sub-filter cloud scheme applied to grey-zone convection Thomas Lloyd Webb and Peter Clark

Tuesday 16 July 2019

Chair: Peter Clark
09:00 – 14:35 Turbulence and EDMF
09:00 A statistical approach to evaluate parametrised turbulence in convection-permitting models using radar-retrieved eddy dissipation rates

Matthew Feist, Peter Clark, Humphrey Lean, Thorwald Stein, Chris Westbrook and Carol Halliwell

09:20 Turbulence Kinetic Energy – Scalar Variance Mixing Scheme for NWP Models

Dmitrii Mironov and Ekaterina Machulskaya

09:40 Impact of turbulence representation on deep convective clouds

Didier Ricard, Christine Lac, Nicolas Rochetin, Clément Strauss and Antoine Verrelle

10:00 Unity, fidelity, and simplicity in parameterizations: The example of momentum fluxes

Vincent Larson, Invited

10:35 – 11:05 Coffee and Tea Break
Chair: John Thuburn
11:05 Performance of a 3D, second order turbulence scheme in the turbulence grey-zone

Carol Halliwell and Peter Clark

11:25 Using updraft covariances for entrainment closures in an extended eddy diffusivity/mass flux model

Yair Cohen, Anna Jaruga, Ignacio Lopez, Jia He, Charles Kawczynski and Tapio Schneider

11:45 Using LES as a non-hydrostatic testing ground for designing scale-adaptive and stochastic parameterizations for the grey zone

Roel Neggers, Philipp Griewank and Thijs Heus

12:05 Scale-aware tests of the MYNN-EDMF PBL and shallow cumulus scheme with a novel framework

Wayne Angevine and Joseph Olson

12:25 – 12:35 30-second Lightning Lectures by Poster Presenters
12:35 – 14:25 Lunch and Posters
Chair: Adrian Lock
14:25 – 15:05 Multi-fluids approaches
14:25 Multi-fluid Modelling of Convection

Hilary Weller, William McIntyre and Dan Shi

14:45 Identifying coherent structures by optimising a two-fluid representation of shallow convection

Georgios Efstathiou and John Thuburn

15:05 – 17:30 Updraught/downdraught dynamics
15:05 What is the basic structural unit of cumulus convection, and why does it matter?

Hugh Morrison, Invited

Chair: Leo Donner
16:10 A simple model of convective drafts accounting for the perturbation pressure term

Jean-Marcel Piriou, Julien Leger, Jean-Philippe Lafore and Jean-François Guérémy

16:30 Dynamics of subsiding shells in actively growing clouds with vertical updrafts

Vishnu Nair, Thijs Heus and Maarten van Reeuwijk

16:50 Detecting thermals in deep convection

Liam Till, Thorwald Stein, Peter Clark and Carol Halliwell

17:10 Entrainment and its dependence on convective organization and large-scale state in convection-permitting simulations

Tobias Becker and Cathy Hohenegger

17:30 – 17:50 Returning to the large scale (Part I)
17:30 A physical mechanism for the relationship between climate sensitivity, low-level cloud feedback and double-ITCZ bias

Mark Webb and Adrian Lock

Tuesday’s Poster Presentations

201 Towards improving the representation of divergent-type modes of tropical variability in the NOAA GFS Stefan Tulich and Jian-Wen Bao
202 The Subgrid Convection and Turbulent Mixing Parameterizations in the Grey Zone Jian-Wen Bao
203 Buoyancy-Driven Entrainment in Dry Thermals Brett McKim, Nadir Jeevanjee and Daniel Lecoanet
204 Assessment of model tendencies in the transition towards resolved deep convection Luc Gerard
205 Convectively coupled equatorial wave simulations using the ECMWF IFS and the NOAA GFS cumulus convection schemes in the NOAA GFS model Bengtsson, L., Dias, J., Gehne, M., Bechtold, P., Whitaker, J., Bao., J-W., Magnusson, L., Michelson, S., Pegion, P., Tulich, S., and Kiladis., G.N.
206 Enhancing model convective precipitation in the presence of lightning José Davi Moura, Sin-Chan Chou and Osmar Pinto
207 Wind shear and deep moist convection Megan Bickle, John Marsham, Andrew Ross and Stephen Griffiths
208 The influence of the urban surface on boundary-layer cloud formation: from observing processes to model evaluation Natalie Theeuwes, Janet Barlow, Ryan Teuling, Sue Grimmond, Simone Kotthaus and Ian Boutle
209 Exploring the consequences of nearest neighbour interaction in convective parametrisations Tobias Goecke
210 Evaluation of a modified convection scheme and its impact on systematic SST biases using initialized ensemble seasonal hindcasts Hsi-Yen Ma, Cheska Siongco, Stephen Klein, Shaocheng Xie, Alicia Karspeck, Kevin Raeder, Jeffrey Anderson, Guang Zhang and Xiaoliang Song

Wednesday 17 July 2019

Chair: Natalie Harvey
09:00 – 10:20 Constraints on convection permitting models
09:00 Radiative-convective equilibrium across the gray zone: Bulk convergence with resolution

Todd Jones and Carol Halliwell

09:20 The representation of convection in the Unified Model at 1.5km to 50m gridlength

Kirsty Hanley and Humphrey Lean

09:40 Biases in the diurnal cycle of convection in convection permitting configurations of the UM in different parts of the world.

Humphrey Lean, Kirsty Hanley, Stuart Webster, Will Keat, Thorwald Stein, Todd Lane, Martin Jucker, Elizabeth Kendon and Giorgia Fosser

10:00 Slantwise Convection: Dynamics and Sensitivity to Resolution in Numerical Modeling

Ting-Chen Chen, M. K. Yau and Daniel Kirshbaum

10:20 – 10:40 Coffee and Tea Break
Chair: Michael Herzog
10:40 – 11:35 Machine learning for understanding organisation
10:40 Machine Learning: Building parameterizations and understanding clouds

Stephan Rasp, Invited

11:15 Unsupervised classification of convective organisation with Deep Learning

Leif Denby

11:35 – 12:15 Grey zone
11:35 The Grey Zone Project: an intercomparison project of scale-aware approaches to turbulence and convection

Lorenzo Tomassini, Rachel Honnert, Georgios Efstathiou, Adrian Lock, Stephan de Roode and Pier Siebesma

11:55 AROME model in the grey zone and Grey Zone Project II

Rachel Honnert, Ghislain Faure and Fleur Couvreux

13:45 – 15:00 Discussion Sessions (summaries at the bottom of the page)
15:15 – 16:45 Grey Zone Project Meeting

Wednesday’s Poster Presentations

301 How is a single updraft influenced by other clouds in a convective ensemble? Anne Barber, Steven Boeing, Andrew Ross, Alan Blyth and Alison Stirling
302 In search of a suitable scheme for modelling grey zone convection with the multi-fluid approach Will McIntyre, Hilary Weller, Chris Holloway and Dan Shipley
303 Multi-fluid modelling of Rayleigh-Benard convection at grey-zone resolutions Daniel Shipley, Hilary Weller, Peter Clark, Tom Webb and Will McIntyre
304 The Non-Traditional Coriolis Force and Convective Clouds Matthew Igel and Joseph Biello
305 Differentiation between dynamical and physical contributions to sub-grid process at grey zone Lijuan Li
306 Developing the RAP/HRRR Physics Suite to Improve Shallow-Cumulus Structures Across the Greyzone Joseph Olson, Jaymes Kenyon and Wayne Angevine
307 Evaluation of the diurnal precipitation cycle in the New Tiedtke scheme May Wong, Glen Romine and Chris Snyder
308 Evaluating size-dependent parametrized plume profiles with Large-Eddy-Simulations of shallow convection Philipp Griewank, Neggers and Heus
309 The Impact of Variability in Aerosol Concentrations on the Convective Mixed-Phase Clouds in the Arctic Jan Chylik, Roel Neggers and Stephan Mertes

Thursday 18 July 2019

Chair: Hilary Weller
09:00 – 11:20 Spectral approaches
09:00 Evaluation of bulk mass flux formulation using large-eddy simulations

Jian-Feng Gu, Robert Plant, Christopher Holloway, Todd Jones, Alison Stirling, Peter Clark and Steven Woolnough.

09:20 Coexistence of subgrid-scale convective processes within a GCM grid-cell: The picture inferred from a large-eddy simulation

Catherine Rio, Frédéric Hourdin, Jean-Yves Grandpeix, Caroline Müller, Abdoul- Khadre Traore and Nicolas Rochetin.

09:40 Spectral cumulus parameterization based on cloud-resolving model and its application to AGCMs

Yuya Baba

10:00 Stochastic plume ensembles for a unified shallow-deep mass flux cumulus parameterization in the single column Community Earth System Model (CESM)

Bidyut Bikash Goswami, Boualem Khouider, Phani Murali Krishna Ravuri and Andrew Majda

10:40 Single-column model experiments with the MetUM coupled to a stochastic multi-cloud model

Rob Warren and Christian Jakob

10:20 – 10:40 Coffee and Tea Break
Chair: Humphrey Lean
11:00 First Results from Coupling the Convective Cloud Field Model to the Met Office’s Unified Model

Eimear Dunne, Michael Herzog, Maria Russo and Luke Abraham.

11:20 – 12:35 Convective Organisation
11:20 Convective organization: should we parameterize it?

Cathy Hohenegger, Invited

11:55 Evaluating the bias of South China Sea summer monsoon precipitation associated with fast physical processes using climate model hindcast approach

Wei-Ting Chen, Chien-Ming Wu and Hsi-Yen Ma

12:15 Using convective aggregation to inform convection parametrization development

Christopher Holloway and Todd Jones

12:35 – 12:45 30-second Lightning Lectures by Poster Presenters
12:45 – 14:30 Lunch and Posters
Chair: Andrew Ross
14:30 – 17:00 Cold pools and triggering
14:30 The simulation of the diurnal cycle of deep convection over land in a new Met Office Cloud-Resolving model

Chimene Daleu, Natalie Harvey, Robert Plant and Steven Woolnough

14:50 Development and tests of a cold-pool scheme in the Met Office Unified Model

Gabriel Rooney

15:10 Cold pool driven convection initiation and missing aspects in km-scale models

Mirjam Hirt, Sophia Schäfer, Julien Savre and George Craig

15:30 Coupling cold pools with shallow convection in LMDZ6

Ludovic Touze-Peiffer and Jean-Yves Grandpeix

15:50 – 16:20 Coffee and Tea Break
Chair: Bob Plant
16:20 Diurnal Cycle of Precipitation Simulated by the E3SM Atmosphere Model Version 1 (EAMv1) with a Revised Convective Trigger

Shaocheng Xie

16:40 A stochastic triggering parameterization for deep convection in LMDZ

Nicolas Rochetin, Jean-Yves Grandpeix, Fleur Couvreux, Catherine Rio and Frederic Hourdin

17:00 – 17:35 Evaluation
17:00 Precipitation-buoyancy relationships and their consequences for fundamentals of precipitation statistics

David Neelin, Invited, Remote Presentation

Thursday’s Poster Presentations

401 Kurnell Storm (2015) simulation with high resolution ACCESS models Hongyan Zhu and Alain Protat
402 Understanding the impact of surface heterogeneity on the diurnal cycle of deep convection Natalie Harvey, Chimene Daleu, Steven Woolnough and Bob Plant
403 A Stochastic Unified Convection Scheme (UNICON) Jihoon Shin and Sungsu Park
404 A composite study of cloud structure and its implication for the parameterization of vertical fluxes Jian-Feng Gu, Robert Plant, Christopher Holloway and Todd Jones
405 Using WRF Single Column Model as a testbed for convective parameterization Yi-Ling Hwong and Steve Sherwood
406 The genesis of convective clouds Leif Denby, Steven Boeing, Doug Parker and Mike Whitall
407 Recent Approach toward More Physically-based Convection Scheme in the JMA Operational Global Model Akira Shimokobe, Masashi Ujiie, Hitoshi Yonehara, Masayuki Nakagawa, Kei Saitou, Ryoji Nagasawa, Hitoshi Sato and Manabu Ueda
408 The effects of switching-off parameterized convection at grey-zone resolutions Jesus Vergara-Temprado, Nikolina Ban and Christoph Schaer
409 NWP forecast of hydrological cycle in FV3 with a different convection scheme Haiqin Li, Georg Grell, Saulo Freitas, Hannah Barnes and Keren Rosado
410 A study on the relationship between stable water isotopes and precipitation characteristics in the tropics using NICAM-isotope Yuki Takano and Yikari N. Takano

Friday 19 July 2019

Chair: Hannah Barnes
09:00 – 11:20 Evaluation, continued
09:00 Convection over and surrounding an idealised island

Rachel Stratton

09:20 Cloud Trails: Are the clouds important?

Michael Johnston, Christopher Holloway and Robert Plant

09:40 Evaluation of convective precipitation using space-borne radar observation

Kengo Matsubayashi

10:00 New Paradigm for Organized Convection Parameterization in GCMs

Mitchell Moncrieff

10:20 – 10:40 Coffee and Tea Break
Chair: Alison Stirling
10:40 Object-Based Precipitation System Bias in Grey Zone Simulation: A Preliminary Study for Unified Parameterization

Chun-Yian Su, Chien-Ming Wu, Wei-Ting Chen and Jen-Her Chen

11:00 Diagnosing Convection in Extra-Tropical Cyclones in GFDL AM4

Leo Donner, Catherine M Naud, James F Booth, Charles Seman, Ming Zhao, Huan Guo and Yi Ming

11:20 – 11:40 Returning to the large scale (Part II)
11:20 The role of convective schemes in regulating lapse rates and midlatitude jet latitudes

Steven Sherwood and David Fuchs

11:40 – 12:00 Discussion (summaries at the bottom of the page)
12:00 – 14:00 Lunch
14:00 – 16:30 Wrap-up Discussions (summaries at the bottom of the page)

Summaries on the discussion groups are here: convection playground, nitty gritty details, grey zone, current challenges and machine learning.