DOI: 10.5281/zenodo.17357000
title: Gridded CLaMS Simulations Driven by Multiple Reanalyses

description: Dataset Documentation: Gridded CLaMS Simulations Driven by Multiple ReanalysesVersion: 1.0

1) Overview

This dataset contains global, gridded output from the Chemical Lagrangian Model of the Stratosphere (CLaMS). The simulations were performed using two versions of the CLaMS model (v1.0 (Pommrich et al., 2014) and v3.1 (Konopka et al., 2025), see cited papers for details) driven by several major meteorological reanalysis products. The native Lagrangian output has been interpolated (gridded) onto a regular latitude-longitude grid and is provided on both pressure and isentropic (potential temperature) vertical coordinates

2) Simulations Description

The dataset comprises five distinct model simulations. The temporal coverage for each simulation is listed below.

        Table 1: Model simulations.| CLaMS Version | Driving Reanalysis | Time Period Covered || ------------- | ------------------ | ------------------- || 3.1           | ERA5               | Jan 2004 – Dec 2023 || 1.0           | ERA5               | Jan 2004 – Jan 2023 || 1.0           | ERA-Interim        | Jan 2004 – Jul 2019 || 1.0           | JRA-55             | Jan 2004 – Dec 2017 || 1.0           | MERRA-2            | Jan 2004 – Dec 2017 |

 

3) File Format, Missing Values, and Naming Convention

Format: All files are provided in netCDF format and in five ZIP archives, one archive for each simulation.

Frequency: Monthly-mean data stored in yearly files, derived from daily gridded datasets.

Missing Values: 1.0e-30 (should be treated as NaN or masked before further calculations).

Naming Convention: [CLaMS Version] [Reanalysis] [Longitude] [Latitude] [Vertical Coordinate] [YYYY].nc

Components:[CLaMS Version]: clams v1.0 (for CLaMS version 1.0), clams v3.1 (for CLaMS version 3.1)[Reanalysis]: era5, erain, jra55, merra2[Longitude]: lon (for longitude) zm (for zonal mean)[latitude]: lat (for latitude)[Vertical Coordinate]: press (for pressure) or theta (for potential temperature)[YYYY]: Year, e.g., 2001 or 1980.

Examples:clams v3.1 era5 lon lat press 2001.nc (ERA5-driven CLaMS v3.1 on pressure levels for 2001)clams v1.0 erain zm lat theta 1995.nc (ERA-Interim-driven CLaMS v1.0, zonal mean on po-tential temperature levels for 1995)

4) Grid and Coordinate System

Horizontal Grid: 1° × 1° regular latitude–longitude grid.

Vertical Grids:

Pressure Levels (hPa): 1000.00, 900.00, 850.00, 825.40, 681.29, 562.34, 464.16, 383.12, 316.23, 261.02, 215.44, 177.83, 146.78, 121.15, 110.00, 100.00, 90.00, 82.54, 75.00, 68.13, 60.00, 56.23, 46.42, 38.31, 31.62, 26.10, 21.54, 14.68, 10.00, 6.81, 4.64, 3.16, 2.15, 1.47, 1.00, 0.68, 0.46, 0.22, 0.10

Isentropic Levels (K): 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 450, 475, 500, 550, 600, 650, 700, 800, 900, 1000, 1250, 1500, 2000, 2250, 2600

 

5) Data Variables

5.1)CLaMS Model Variables

Ten CLaMS prognostic variables are included in all simulations.

                    Table 2: Trace gas species and their units.| Variable | Long Name                                                                                                                                                       |  Units   || --------------| ----------------------------------------------------------------------------------------------------------------------------------------|------------ || CH4        | Methane volume mixing ratio                                                                                                                        | m³/m³ || CO          | Carbon monoxide volume mixing ratio                                                                                                         | m³/m³ || CO2        | Carbon dioxide volume mixing ratio                                                                                                             | m³/m³ || O3           | Ozone volume mixing ratio, above 500 K from HALO climatology (see Pommrich et al., 2014)       | m³/m³ || N2O        | Nitrous oxide volume mixing ratio                                                                                                                | m³/m³ || F11         | CFC-11 volume mixing ratio                                                                                                                           | m³/m³ || F12         | CFC-12 volume mixing ratio                                                                                                                           | m³/m³ || H2O        | Water vapour volume mixing ratio                                                                                                                | m³/m³ || E90         | E90 tracer mixing ratio                                                                                                                                    | m³/m³ || AGE        | Mean age from clock tracer mixing ratio, linearly increasing at the global Earth's surface                |      yr     |

Extended list of chemical species available in CLaMS v3.1:

  Table 3: Extended trace gas species and their units.| Variable | Long Name                         | Units || -------- | --------------------------------- | ----- || F22      | Chloro(difluoro)methane (HCFC-22) | m³/m³ || SF6      | SF6 volume mixing ratio           | m³/m³ |

5.2) Reanalysis Meteorological Fields

These variables are interpolated from the driving reanalysis and are not CLaMS prognostic variables. They are included for context and further analysis.

  Table 4: Meteorological fields from the driving reanalysis data.| Variable | Long Name                                     | Units || -------- | --------------------------------------------- | ----- || THETA    | Potential temperature from driving reanalysis | K     || PRESS    | Pressure from driving reanalysis              | hPa   || TEMP     | Temperature from driving reanalysis           | K     || GPH      | Geopotential from driving reanalysis          | m²/s² || SH       | Specific humidity from driving reanalysis     | kg/kg || U        | Zonal wind from driving reanalysis            | m/s   || V        | Meridional wind from driving reanalysis       | m/s   |

 

References

Konopka, P., Ploeger, F., D’Amato, F., Campos, T., von Hobe, M., Honomichl, S. B., Hoor, P., Pan, L. L., Santee, M. L., Viciani, S., Walker, K. A., and Hegglin, M. I. (2025). Isentropic mixing vs. convection in clams-3.0/messy: Evaluation using satellite climatologies and in situ carbon monoxide observations. EGUsphere, 2025:1–32.

Pommrich, R., Müller, R., Grooß, J.-U., Konopka, P., Ploeger, F., Vogel, B., Tao, M., Hoppe, C. M., G ̈unther, G., Spelten, N., Hoffmann, L., Pumphrey, H.-C., Viciani, S., D’Amato, F., Volk, C. M., Hoor, P., Schlager, H., and Riese, M. (2014). Tropical troposphere to stratosphere transport of carbon monoxide and long-lived trace species in the Chemical Lagrangian Model of the Stratosphere (CLaMS). Geosci. Model Dev., 7(6):2895–2916.