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EVENT DETAILS |
LEAP RESEARCH UPDATE
Speaker: MAGGIE POWELL (Columbia University)
Date: October 3, 2024
Time: 12:00 p.m.
Format: Hybrid
Virtual: Zoom link provided upon registration
In-person: Columbia Innovation Hub, 2276 12th Avenue, Second Floor, Room 202, New York, NY 10027
*Please note that in-person space is limited.*
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Title: "Leveraging Subgrid-Scale Spatial Organization & Variability for Improved Cloud Fraction Parametrization Using PINACLES Simulations"
Abstract: Given the coarse resolution of Earth System Models (on the order of 100 km), cloud processes must be parametrized. As a consequence, cloud processes are a major source of uncertainty in climate projections, with particular intermodel disagreement in the representation of low marine boundary layer clouds. Cloud fraction parametrizations have long relied upon subgrid-scale information of the total water distribution using various probability density functional forms. However, the importance of subgrid-scale spatial organization, including coherent updraft & downdraft, for cloud fraction has not been fully examined. In this study, we use machine learning to implicitly learn the subgrid-scale organization of shallow clouds & assess the information gained from including these subgrid features in a neural network-based parametrization. For this work, we use data from the Predicting INteractions of Aerosol & Clouds in Large Eddy Simulations (PINACLES) model for domains in the Eastern North Atlantic, Northeastern Pacific, Southern Great Plains, & Southern Ocean. Particular focus is given to the varying importance of subgrid-scale variability across shallow cloud regimes.
Bio: Margaret (Maggie) is interested in improving the parameterization of marine boundary layer clouds using machine learning & high-fidelity numerical simulations. As a DOE Computational Science Graduate Fellow, she is excited to apply high-performance computing methods within atmospheric science. Maggie has previously worked as a data scientist at a climate-tech startup & as a researcher at an environmental consulting firm. She received her A.B. in Earth & Planetary Sciences from Harvard University, where she researched Arctic methane emissions.
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