Reanalysis

Comprehensive weather and climate datasets, reanalyses assimilate a variety of observations of the atmosphere, land surface, and ocean into a forecast model to provide a dynamically consistent estimate of the climate state at each time step.

Below is the atmospheric reanalysis overview page, which summarizes the attributes of the major atmospheric reanalyses. This section also includes selected oceanic reanalyses, although an overview is not available yet.

To find a specific reanalysis, jump to the search box below or click your desired reanalysis from among the blue sub-category buttons.

To see only the reanalyses pages accompanied by in-depth commentary, select the "Datasets with guidance" button when using the search box.

Climate datasets

Has expert guidance
NASA's MERRA2 reanalysis NASA's MERRA2 reanalysis

  • Years of record

  • to

The Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA-2) is a global atmospheric reanalysis produced by the NASA Global Modeling and Assimilation Office (GMAO). It spans the satellite observing era from 1980 to the present. The goals of…

Main variables and Earth System components

Atmosphere Aerosols Air Temperature Geopotential Height Precipitable water

    • Timestep

    • Sub-daily, Daily, Monthly

    • Collections

    • None
NASA MERRA NASA MERRA

  • Years of record

  • to

The Modern Era Retrospective-Analysis for Research and Applications (MERRA) was undertaken by NASA’s Global Modeling and Assimilation Office with two primary objectives: to place observations from NASA’s Earth Observing System satellites into a climate context and to…

Main variables and Earth System components

Atmosphere Air Temperature Geopotential Height Precipitable water Water Vapor

  • Experts contributing reviews

  • None