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Updated: Dec 31, 2025

Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
The Ensemble Mars Atmosphere Reanalysis System (EMARS) Version 1.0.
Steven J Greybush1,2,3, Eugenia Kalnay3, R John Wilson4
1Department of Meteorology and Atmospheric Science The Pennsylvania State University University Park PA USA.
The Ensemble Mars Atmosphere Reanalysis System (EMARS) dataset provides hourly Martian atmospheric data from 1999-2017. This reanalysis combines observations with a climate model for detailed atmospheric studies and spacecraft operations.
Area of Science:
- Planetary Science
- Atmospheric Science
- Climate Science
Background:
- Reanalysis combines sparse observations with dynamical models to estimate atmospheric states.
- The Ensemble Mars Atmosphere Reanalysis System (EMARS) dataset offers a comprehensive view of Mars' atmosphere.
Purpose of the Study:
- To release version 1.0 of the EMARS dataset, providing hourly gridded atmospheric variables for Mars.
- To enable detailed scientific and engineering studies of the Martian atmosphere.
Main Methods:
- Utilizes the Local Ensemble Transform Kalman Filter (LETKF) for data assimilation.
- Employs the GFDL/NASA Mars Global Climate Model (MGCM).
- Assimilates temperature data from the Thermal Emission Spectrometer (TES) and Mars Climate Sounder (MCS).
Main Results:
- Provides hourly gridded fields of temperature, wind, surface pressure, dust, water ice, and CO2 ice.
- Covers Mars Year 24 through 33 (1999-2017).
Conclusions:
- The EMARS dataset is a valuable resource for studying Martian atmospheric phenomena like dust storms and polar vortex.
- Enables enhanced planning and operations for Mars missions.
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