Codes and data for manuscript 'Uncontrolled waste burning dominates global inhalable microplastic emissions'

Description

We used the GEOS-Chem Classic (version 14.6) modeling system to simulate the atmospheric concentrations and depositions of microplastics. The model is managed by the GEOS-Chem Support Team, based at Harvard University and Washington University. "Input.tar.gz" contains the run scripts of the GEOS-Chem model for this study and the sample datasets used to test the model (simulation for January 1, 2020).

Steps to reproduce

Detailed information about the history, usage, and application of the GEOS-Chem Classic model was described on the official website (https://geos-chem.readthedocs.io/en/stable/index.html and https://geoschem.github.io/) and the release website on GitHub (https://github.com/geoschem/). The detailed installation steps for the model were described at https://geos-chem.readthedocs.io/en/stable/gcclassic-user-guide/run.html. Therefore, we will not repeat them since we utilized the default GEOS-Chem Classic 14.6 without any revision. The steps to run the model in this study include the following:  Download the source code of GEOS-Chem Classic 14.6 from GitHub (https://github.com/geoschem/GCClassic/archive/refs/tags/14.6.0.tar.gz).  Install the model. An executable file named “gcclassic” will be generated. The installation time is within 30 minutes for a Ubuntu 20.04 operating system with 64 processors and 256 GB RAM.  Copy the file “input.tar.gz” to a certain path, change the directory to this path, and extract the file with “tar -xvzf input.tar.gz” command. We have included all the input files in the zip file, including the microplastic emissions, meteorological dataset, restart file, and configuration files. To run the model:  Change the directory to the extracted directory (where geoschem_config.yml is).  Copy the HEMCO_Config.rc, HEMCO_Config.rc.gmao_metfields, HEMCO_Diagn.rc, HISTORY.rc, species_database.yml, geoschem_config.yml, and Restarts directory to the work directory where you install the GEOS-Chem Classic 14.6 (i.e., where “gcclassic” is located).  Change the directory to the work directory. Modify the simulation periods by running “vi geoschem_config.yml”, and set start_date and end_date as [20200101, 000000] and [20200131, 000000], respectively.  Set environment variables with the following commands, assuming that you plan to use 32 cores for simulation: ulimit -s unlimited export OMP_NUM_THREADS=32 export OMP_STACKSIZE=50000m  Run the command “./gcclassic”, which runs the model and produces outputs at the time resolution you specify (default: daily). The expected output files for January 1st 2020 has been included in "Expected_output.tar.gz".

Institutions

• Fudan University

  Shanghai, Shanghai

Categories

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