Dynamical Core Model Intercomparison Project 2025�Introduction and Welcome�June 2^nd – 6^th, 2025

DCMIP-2025 organizers and model mentor team:

​

Christiane Jablonowski, Tim Andrews, Owen Hughes, Garrett Limon, Nicholas Androski, Aaron Johnson, Anthony Chen, Nicholas Forcone, University of Michigan (UM)

Travis O’Brien and Joshua Elms, Indiana University

Peter Lauritzen, Adam Herrington, Jon Truesdale, NCAR

Mark Taylor, Peter Bosler, Oksana Guba, Sandia National Laboratories

Colin Zarzycki, Penn State University

Don Dazlich, Colorado State University

​

​

​

​

Welcome to Boulder

Boulder lies at 1655 m above sea level (5430 feet)

Stay hydrated and drink lots of water

Use sunscreen if the sun is out

The weather forecast for Boulder during this week (weather.gov): A mixed bag

DCMIP: Code of Conduct

What is DCMIP?

• The DCMIP-2025 summer school and workshop highlights the newest modeling techniques for climate and weather models.

​

• DCMIP-2025 focuses on the impact of topography on the flow field, physics-dynamics coupling aspects with a simple warm-rain physics scheme and an exploratory Machine Learning element

​

• DCMIP-2025 includes:
• A morning “summer school” that incorporates lectures and hands-on sessions for students, postdocs and researchers.
• An afternoon “hands-on workshop” that gives participants the opportunity to work with operational modeling systesm from around the world.
• A dynamical core intercomparison to quantify difference in three models that are embedded in NCAR’s Community Atmosphere Model (CAM)

Tim Andrews

Garrett Limon

Owen Hughes

Christiane Jablonowski

Aaron Johnson

Anthony Chen

Nicholas Androski

Nicholas Forcone

DCMIP Team from the University of Michigan

Travis O’Brien

Joshua Elms

Peter Lauritzen

Adam Herrington

John Truesdale

Colin Zarzycki

Peter Bosler

Mark Taylor

Don Dazlich

DCMIP organizers

DCMIP-2025 Speakers

William�Chapman

Cecile Hannay

Brian Medeiros

David Randall

Richard Neale

David Hall

Dmitrii Kochkov

Isla Simpson

Greg Hakim

David Lawrence

DCMIP Overview

• Brief history of the Dynamical Core Model Intercomparison Project (DCMIP)
• DCMIP-2008: Focus on dry hydrostatic dynamical cores
• DCMIP-2012: Focus on emerging non-hydrostatic dycores with dry and idealized-moist test cases
• DCMIP-2016: Focus on physics-dynamics interactions with simple moisture processes (Kessler warm-rain physics) and toy chemistry in non-hydrostatic dynamical cores
• DCMIP-2025: Focus on the impact of topography on the flow field, physics-dynamics coupling, and an exploratory machine learning element

2008, 2012,�2016 & 2025

2008

2012

2016

2016

DCMIP�Teams

Dynamical Core Model Intercomparison Project (DCMIP) and Summer Schools

9

Hands-on�Learning

CAM-SE

FV3

ICON-IAP

DYNAMICO

NICAM

NIM

ENDGame

FIM

OLAM

IFS

MPAS (2012)

MCORE

OLAM

UZIM/CSU

CAM-FV

MCORE/Tempest

FIM

NEPTUNE

ACME (E3SM)

FVM

GEM

ICON-MPI-DWD

MPAS (2016)

DCMIP Participants (50 Total)

Countries with representation at DCMIP-2025

Finland

Germany

Italy

UK

New Zealand

China

Canada

USA

https://sites.google.com/umich.edu/dcmip-2025/dcmip-2025-participants

Overview of DCMIP-2025 & the DCMIP Test Case Suite

• 3 dynamical cores embedded in NCAR’s Community Atmosphere Model (CAM):
• DoE/NCAR’s Spectral Element (SE) model
• NCAR’s Model for Prediction Across Scales (MPAS)
• NOAA’s Finite-Volume Cubed Sphere (FV3), Geophysical Fluid Dynamics Laboratory
• 4 science themes:
• 1: Dry mountain-generated inertia gravity waves (hydrostatic)
• 2: Dry mesoscale mountain-generated processes and vortices (hydrostatic)
• 2a: Gap flow
• 2b: Vortex shedding (von-Karman vortex streets)
• 3: Physics-dynamics coupling: Squall line test with simple rain (nonhydro)
• 4: Machine Learning (ML) testbed for pretrained emulators
• GraphCast (Google), Spherical FourCastNet (NVIDIA)

​

We thank the DCMIP-2025 Sponsors and Supporters

Elizabeth Faircloth, Daniel Sena and the CGD admin team

NCAR’s multi-media team: Paul Martinez and Jesse Webb

Negin Sobhani, Brian Vanderwende, Jian Sun, and the CISL support team

Sandra Pytlinski, Emily Bailey, Kevin O’Neill�(UM admins)

Funding source

Funding source

Logistics: Typical Daily DCMIP-2025 Agenda

​

8:00am Bus leaves the Embassy Suites Hotel

8:30am – 9:00am Lecture 1

9:00am – 10:00am Lecture 2

10:00am – 10:30am Morning break

10:30am – 11:30pm Lecture 3

11:30pm – 12:30pm Lecture 4

12:30pm – 1:30pm Lunch in the Mesa Lab Cafeteria (self-paid)

1:30pm – 3:15pm Hands-on session 1 in the Library

3:15pm – 3:45pm Afternoon break

3:45pm – 5:15pm Hands-on session 2 in the Library

5:30pm Bus pickup from the Mesa Lab

See the detailed schedule: https://sites.google.com/umich.edu/dcmip-2025/schedule

• The DCMIP-2025 webpage is a Wiki �https://sites.google.com/umich.edu/dcmip-2025/home�and you are all editors
• Do not delete / overwrite any information posted by others
• Wiki contains a lot of information on the DCMIP test cases and how to run them
• Wiki will also be used for the hands-on portion: you and your team will post your results online
• More information about the hands-on portion at 11:30am

​

Logistics: Communication Platform

• Are there people who have difficulty connecting to the NCAR server?
• We are in a special situation this week due to a HPC facility shutdown that takes NCAR’s main compute server ‘Derecho’ offline
• Therefore: we use NCAR’s data analysis server ‘Casper’ as our main compute platform this week
• We have a reservation of about 4000 CPUs (24/7 reservation) and 2 GPUs (8am-5pm) on Casper for DCMIP
• We need to share the 4000 CPUs with 60 DCMIP participants and mentors
• We also launch our Jupyter Notebooks as 1-CPU batch jobs on Casper
• Therefore: let us focus on the quicker, lower-resolution simulations during the hands-on afternoon sessions and submit more time-consuming (e.g. higher-resolution) jobs to the queue between (5pm – 10am)

​

Logistics: Compute Environment

• MPAS mentors: Adam Herrington, Peter Lauritzen, Anthony Chen, Don Dazlich, Colin Zarzycki (from Wednesday onwards)
• FV3 mentors: Christiane Jablonowski, Tim Andrews, Aaron Johnson, John Truesdale
• SE mentors: Mark Taylor, Peter Bosler, Owen Hughes, Nicholas Forcone, Nicholas Androski
• ML mentors: Joshua Elms, Garrett Limon, Travis O’Brien�

Group assignments: See https://sites.google.com/umich.edu/dcmip-2025/dcmip-2025-participants

Logistics: Our Modeling Teams (8 groups)