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Tutorial On DOE ARM’s Large-Eddy Simulation, a.k.a. LASSO

Location

Physics : 401

Date & Time

May 2, 2023, 10:00 am – May 3, 2023 4:00 pm

Description

LASSO stands for Large-Eddy Simulation (LES) ARM Symbiotic Simulation and Observation activity. The aim is to enhance ARM observations by using LES modeling to provide context and a self-consistent representation of the atmosphere surrounding ARM measurement sites. Hence, LASSO connects processes and facilitates improved understanding of the underlying physics.

The University of Maryland Baltimore County, in partnership with the LASSO team, will hold a two-day hybrid tutorial on May 2nd and 3rd. In-person attendees will join us and Dr. William Gustafson (PNNL) at the Physics Department on UMBC’s main campus and participate in hands-on activities. The tutorial sessions will be transmitted by Webex, allowing participation from across the globe.

During the two days, participants will learn more about the LASSO shallow convection scenario at the Atmospheric Radiation Measurement (ARM) user facility’s Southern Great Plains (SGP) atmospheric observatory, and about the LASSO-CACTI for deep convection and how it differs from the shallow convection approach. Participants will also learn how they may access the data for their research or classwork, and how they can use the LASSO evaluation software on their own model output.

Registration is now open for the tutorial: https://forms.gle/T4MZsMwM9zLDUAjw6

Deadline is April 26th, and in-person participation is limited to 25 people.

WHAT’S COVERED?

Dr. Gustafson will lead the tutorial, which will address beginning and advanced aspects of LASSO, as well as hands-on activities. The schedule:

Part 1, Tuesday (5/2) 10-11 am will focus on the LES methodology used in LASSO and how to obtain LASSO data. Dr. Gustafson will walk through how the LASSO LES runs are configured, the LES ensembles generated for each case day, and what model output and post-processed data are available.

Part 2, Tuesday (5/2) 1-2 pm will focus on the observation suite included in the LASSO bundles for the SGP shallow clouds scenarios. Dr. Gustafson will walk through the various instruments and how their measurements are used to compute the skill scores and diagnostics for validating LASSO simulations. The use of the LASSO Bundle Browser to identify which LASSO bundles are of interest for the attendees, and how to download the selected bundles most easily is also going to be demonstrated.

Part 3, Tuesday (5/2) 2-4 pm will be a hands-on session: attendees will practice finding and retrieving LASSO and ARM data, looking at the available variables and diagnostics, and doing some plotting and basic analysis examples.

Part 4, Wednesday (5/3) 10-11 am will focus on the LASSO-CACTI simulations. Dr. Gustafson will explain how the LASSO-CACTI deep convection were planned and how it differs from the shallow convection approach.

Part 5, Wednesday (5/3) 1-3 pm will be a hands-on session: further practice handling LASSO data and comparing with ARM measurements. In-person attendees will work in small groups and make a short presentation of their findings.

Part 6, Wednesday (5/3) 3:30 pm Dr. Gustafson’s colloquium for the Physics Department, title: The LASSO Large-Eddy Simulation (LES) Activity for Understanding Clouds and the Boundary Layer: Enabling Research through LES Ensembles for the Community

WHAT BACKGROUND IS REQUIRED?

Because of the hands-on activities, in-person participants are expected to have at least a basic knowledge of Python and Matplotlib, as well as basic Unix commands. In-person attendees should bring their own laptops with a working Python environment (e.g. Anaconda). Some knowledge about the format of WRF’s (Weather Research & Forecasting Model) output files is welcome, but not mandatory.

WHAT ELSE SHOULD I KNOW?

There are no registration fees. For those attending in person, lunch and afternoon coffee breaks will be provided on both Tuesday and Wednesday. If you are driving to UMBC, we will also provide parking.

UMBC Physics Building, Room 401 1000 Hilltop Cir, Baltimore, MD 21250 United States




LASSO Large-eddy simulation for a deep convection event on January 25, 2019, during the CACTI field campaign in Argentina.

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