Chemical Reanalysis Products


This web page provides access to a 14-year (2005-2018) global data set of the chemical concentrations and emissions of various species that are important for air quality and climate.

What is chemical reanalysis?

Chemical reanalysis a technique that combines observational information from multiple satellite sensors and provides comprehensive information on tropospheric composition variations. In our chemical reanalysis developed at JPL, multi-constituent measurements of O3, NO2, CO, HNO3, and SO2 from the OMI, GOME-2, SCIAMACHY, MLS, TES, and MOPITT satellite instruments were assimilated into a global chemical transport model using an ensemble Kalman filter technique. The methodology is explained in our publications (Miyazaki et al., 2015, 2017, 2019).

Figure 1: Schematic picture
Figure 1: Schematic picture of multi-constituent data assimilation used in the chemical reanalysis
Figure 2: Time series of assimilated satellite measurements
Figure 2: Time series of assimilated satellite measurements

What’s available?

Time period2005-2018
Horizontal resolution1.1°×1.1°
Vertical layers27 pressure levels from 1000 to 60 hPa
Temporal resolutionTwo-hourly, six-hourly, or monthly
  • Meteorological fields: u, v, t, q, ps
  • Chemical concentrations: O3, NO2, CO, SO2, OH, NO, HNO3, CH2O, PAN, Aerosols (sulfate, NH3, NH4)
  • Emissions: NOx, CO, SO2, and lightning NOx
  • Model and data assimilation diagnostics

How is this useful?

Chemical reanalysis data sets have great potential to contribute to studies that could improve the understanding of the processes controlling the atmospheric environment and their roles in changing climate. For example:

  • The consistent concentration and emission data provide comprehensive information on atmospheric composition variability from regional to global scales
  • The reanalysis data provide initial and boundary conditions for climate and chemical simulations
  • The emission data can be used to study emission variabilities and to evaluate bottom-up emission inventories from seasonal to decadal scales

What is going on?

  • The chemical reanalysis products will continue to be updated using the latest satellite observations.
  • To improve the quality and capability of chemical reanalysis for various applications, additional observational constraints will be added by assimilating the recently developed advanced satellite data, such as multi-spectral tropospheric ozone retrievals from AIRS/OMI (Fu et al., 2018; Miyazaki et al., 2019).
  • A next generation chemical reanalysis is being developed using a more advanced chemical data assimilation system and will be updated on this website.

Dataset Citation and DOI

Miyazaki, K., Bowman, K., Sekiya, T., Eskes, H., Boersma, F., Worden, H., Livesey, N., Payne, V. H., Sudo, K., Kanaya, Y., Takigawa, M., and Ogochi, K., (2019). Chemical Reanalysis Products. Jet Propulsion Laboratory.

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