DOI: 10.82201/pdfpmf
title: Replication Data for: Implementation of Primary and Secondary Ice Production in EC-Earth3-AerChem: Global Impacts and Insights

description: These data were used for the analysis presented in the publication cited below; see the Methods section in the article for details.&lt;br&gt;
The model data were created using EC-Earth3-AerChem.
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We conducted five main experiments, each spanning 12 years (2009–2020) under present-day climate conditions. Each experiment applied a different ice nucleation parameterization scheme for the MPC regime: 
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1. “Meyers”: baseline temperature-dependent deposition-condensation-freezing scheme (Meyers et al., 1992).
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2. “Harrison”: dust-sensitive parameterization accounting for immersion freezing of K-feldspar and quartz (Harrison et al., 2019).
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3. “Harrison_Wilson” (H+W ): Harrison scheme plus marine organic aerosol parameterization (Wilson et al., 2015).
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4. “HWRaFSIPv1”: H+W scheme combined with RaFSIPv1 (Georgakaki and Nenes, 2024), based on ice enhancement factors.
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5. “HWRaFSIPv2”: H+W scheme combined with RaFSIPv2 (Georgakaki and Nenes, 2024), predicting secondary ice via a random forest model, independently of primary ice.
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Additionally, there are two 12-year nudged experiments (“Meyers_nudged” and “HWRaFSIPv2_nudged”), as well as four additional 1-year experiments (2018): “Meyers”, “HWRaFSIPv2”, and the supersaturation-adjusted runs in MPC (“Meyers_sat_adj_-38” and “HWRaFSIPv2_sat_adj_-38”), extending the temperatures where supersaturation can occur to -38 °C.
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All diagnostics are presented as mean values of monthly averages over the entire simulation period. Averaging was performed using CDO.
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File naming convention: 
&lt;br&gt;{variable_name}_{variable_type}_{model}_{activity}_{simulation}_{grid_type}_{period}_{experiment}.nc
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Description of file name elements: 
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- Variable name: clt (Total Cloud Cover Percentage), clivi (ice water path), clw (Mass Fraction of Cloud Liquid Water), cli (Mass Fraction of Cloud Ice), rlds (Surface Downwelling Longwave Radiation), rldscs (Surface Downwelling Longwave Radiation – Clear Sky), rlut (Top of Atmosphere Upwelling Longwave Radiation), rlutcs (Top of Atmosphere Upwelling Longwave Radiation – Clear Sky), rsds (Surface Downwelling Shortwave Radiation), rsdscs (Surface Downwelling Shortwave Radiation – Clear Sky), rsus (Surface Upwelling Shortwave Radiation), rsuscs (Surface Upwelling Shortwave Radiation – Clear Sky), rsut (Top of Atmosphere Upwelling Shortwave Radiation), rsutcs (Top of Atmosphere Upwelling Shortwave Radiation – Clear Sky), tas (Near-Surface Air Temperature), ta (Air Temperature), felaci (Feldspar in accumulation mode insoluble Aerosol Mass Mixing Ratio), felcoi (Feldspar in coarse mode insoluble Aerosol Mass Mixing Ratio), fisupsat (Fractional ice supersaturation), icnc (Ice Crystal Number Concentration), icncharrison (Ice Crystal Number Concentration from Harrison et al. (2019) immersion freezing of K-feldspar and quartz parameterization), icncharrisonpar (Ice Crystal Number Concentration from Harrison et al. (2019) immersion freezing of K-feldspar and quartz directly from the parameterization), icncwilson (Ice Crystal Number Concentration from Wilson et al. (2015) immersion freezing of marine organic aerosols parameterization), icncwilsonpar (Ice Crystal Number Concentration from Wilson et al. (2015) immersion freezing of marine organic aerosols directly from the parameterization), lwp (Liquid Water Path), moacs (Marine organic aerosols in accumulation mode soluble Aerosol Mass Mixing Ratio), mocos (Marine organic aerosols in coarse mode soluble Aerosol Mass Mixing Ratio), quaaci (AQuartz in accumulation mode insoluble Aerosol Mass Mixing Ratio), quacoi (Quartz in coarse mode insoluble Aerosol Mass Mixing Ratio).
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- Variable type: Amon (atmospheric monthly), AERmon (Aerosol Monthly), CFmon (additional cloud-fraction-related monthly variables).
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- Model: EC-Earth3-AerChem.
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- Activity: ice-nucleation.
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- Simulation: r1 (ensemble number 1), i1 (initialization method 1), p1 (physics index 1), f1 (forcing index 1).
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- Grid type: gr (regular latitude-longitude grid).
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- Period: 200901–202012 (January 2009 – December 2020), 201801–201812 (January – December 2018).
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-Experiment: Meyers, Harrison, Harrison_Wilson, HWRaFSIPv1, HWRaFSIPv2, Meyers_nudged, HWRaFSIPv2_nudged, Meyers_sat_adj_-38, HWRaFSIPv2_sat_adj_-38.
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Data Structure: 
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All variables have latitutde (lat) and longitude (lon) dimensions. 3D variables include vertical coordinates (ap, b) and surface air pressure (ps) to reconstruct pressure levels. 
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Reference / Methods:
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Please refer to the main publication for full details on methods, model configuration, and experiment setup.
description: EC-Earth3, AerChem