BASCOE Reanalysis of Aura-MLS, version 3 (BRAM3): daily zonal means

This dataset comprises on single netCDF file which was used to evaluate the seven chemical forecast experiments with IFS-COMPO Cy49R1, as described in section 3.3 and used in section 6 of
Chabrillat, S. et al.: Modelling stratospheric composition for the Copernicus Atmosphere Monitoring Service: multi-species evaluation of IFS-COMPO Cy49, Geosci. Model Dev., https://doi.org/10.5194/gmd-18-8973-2025, 2025

BRAM3 is an upgrade of BRAM2 (Errera et al., https://doi.org/10.5194/acp-19-13647-2019, 2019). Both reanalyses result from the assimilation of Aura-MLS v4.2 observations of O3, N2O, H2O, HNO3, HCl, CO, CH3Cl and ClO (Livesey et al., 2015: https://mls.jpl.nasa.gov/data/v4-2_data_quality_document.pdf) by the BASCOE chemical Data Assimilation System (DAS, https://strato.aeronomie.be/bascoe), but with different configurations.
The most notable difference is the extension of the covered period until November 2023, thanks to the replacement of the input reanalysis for dynamical fields, from ERA-Interim (Dee et al., https://doi.org/10.1002/qj.828, 2011) in BRAM2 to ERA5 (Hersbach et al., https://doi.org/10.1002/qj.3803, 2020) in BRAM3.

NOTES:

  • the full BRAM3 reanalysis weighs 144 Gb/year. This is a reduced dataset obtained by keeping only the assimilated species, and averaging every day (daily means) and over all longitudes (zonal means) the instantaneous 3-D output at 00h, 06h, 12h, 18h.

  • The levels below 100 hPa or above 1 hPa are not recommended for scientific use

  • N2O observations were assimilated only until 2012/11/19. On later dates, the N2O output of BRAM3 is not constrained by any observations.

  • See also companion dataset: https://doi.org/10.18758/fabatq6o

Data and Resources

Tags

Cite this as (APA format)

Errera, Q., & Chabrillat, S. (2025). BASCOE Reanalysis of Aura-MLS, version 3 (BRAM3): daily zonal means (Version 1) [Dataset]. Royal Belgian Institute for Space Aeronomy. https://doi.org/10.18758/8klj122q

Users of this DOI are kindly encouraged to contact the author(s) for help and cooperation towards further successful utilisation.

Author(s)
Principal

Errera, Quentinorcid, Royal Belgian Institute for Space Aeronomy
Other(s)

Chabrillat, Simonorcid, Royal Belgian Institute for Space Aeronomy;

Contact data-contact of Royal Belgian Institute for Space Aeronomy

Technical info
Is referenced by

  • Chabrillat, S., Rémy, S., Errera, Q., Huijnen, V., Bingen, C., Debosscher, J., Hendrick, F., Metzger, S., Mora, A., Minganti, D., Op de beek, M., Reisenfeld, L., Williams, J. E., Eskes, H., & Flemming, J. (2025). Modelling stratospheric composition for the Copernicus Atmosphere Monitoring Service: multi-species evaluation of IFS-COMPO Cy49. Geoscientific Model Development, 18(22), 8973-9014. https://doi.org/10.5194/gmd-18-8973-2025 (Belgian institutional Open Access repository for Federal Science)

  • Companion dataset: Chabrillat, S., & Errera, Q. (2025). Initial Conditions for stratospheric composition forecasts of polar winter-spring (Version 1) [Dataset]. Royal Belgian Institute for Space Aeronomy. https://doi.org/10.18758/fabatq6o
Is referencing

Chabrillat, S., & Errera, Q. (2025). Initial Conditions for stratospheric composition forecasts of polar winter-spring (Version 1) [Dataset]. Royal Belgian Institute for Space Aeronomy. https://doi.org/10.18758/fabatq6o
Documentation

Temporal features
Starting

August 16, 2004
Ending

December 30, 2021
Temporal resolution

P1D

Additional info
Conforms to

CF convention (version 1.7): see https://cfconventions.org/
Repository homepage

https://data.aeronomie.be/dataset/
Last Updated

April 7, 2026
Created

March 18, 2025

Spatial features

Resolution (m): approximately 200000 in latitude