Home About News A Comprehensive Chemistry Evaluation and Diagnostics Package for E3SM – ChemDyg Version 1.1.0

A Comprehensive Chemistry Evaluation and Diagnostics Package for E3SM – ChemDyg Version 1.1.0

  • August 26, 2025
  • Brief

    • The project is excited to share news about a powerful new resource for atmospheric scientists: ChemDyg v1.1.0, an open-source Chemistry Evaluation and Diagnostics Package developed for the Energy Exascale Earth System Model (E3SM).

    ChemDyg is designed to streamline and enhance the evaluation of atmospheric chemistry in E3SM. With its modular architecture, ChemDyg enables researchers to routinely assess model performance, tailor development efforts, and conduct deep-dive analyses of atmospheric chemistry processes. ChemDyg can also be called as a plugin in zppy.

    What’s new in ChemDyg v1.1.0?

    • Advanced Diagnostics: The latest version introduces robust diagnostic tools, including climatology, time evolution of key tracers, diurnal and annual cycle analyses, and comprehensive budget diagnostics.
    • Observational Comparisons: Users can now easily compare model outputs with observational data, helping to identify and address model discrepancies.
    • Interactive HTML Outputs: ChemDyg generates interactive HTML reports, making data exploration and sharing more accessible for the research community.
    • Customizable Framework: The package’s flexible design allows users to create and adapt diagnostic sets, addressing specific scientific questions and research needs.
    • User-Friendly Documentation: Each diagnostic set comes with dedicated scripts and clear documentation, ensuring a smooth user experience.

    Key Chemistry-Related Diagnostics in ChemDyg v1.1.0

    Evaluates total column ozone (TOZ)

    Evaluates total column ozone (TOZ) and temperature fields as a function of equivalent latitude, aiding in polar and midlatitude analysis.

    • TOZ & Temperature with Equivalent Latitude
      • Evaluates ozone and temperature fields as a function of equivalent latitude, aiding in polar and midlatitude analysis.

     

    Quantifies stratosphere-troposphere exchange (STE) ozone fluxes to assess transport processes

    • STE Ozone Flux Diagnostics
      • Quantifies stratosphere-troposphere exchange (STE) ozone fluxes to assess transport processes.

    Analyzes the Quasi-Biennial Oscillation (QBO) in atmospheric tracers, key for tropical dynamics.

    • QBO Diagnostics
      • Quantifies stratosphere-troposphere exchange (STE) ozone fluxes to assess transport processes.
    • Chemistry Tendency Table:
      • Summarizes the time evolution of chemical species due to various processes.
    • Chemistry Closure Check & Burden Table:
      • Verifies mass conservation and provides total atmospheric burdens for key species.
    • Chemistry Production & Loss Tendency Table:
      • Details the rates of chemical production and loss for major atmospheric compounds.
    • Chemistry High-Level Summary Table:
      • Provides a concise overview of key chemistry diagnostics and model performance.

    By accelerating the evaluation and development of atmospheric chemistry models, ChemDyg v1.1.0 supports more accurate simulations and a deeper understanding of Earth’s atmosphere. This tool is a valuable asset for researchers working to improve Earth system and air quality modeling.

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    This article is a part of the E3SM “Floating Points” Newsletter, to read the full Newsletter check:

     
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