This is the landing page for:
The Ensemble Mars Atmosphere Reanalysis System (EMARS) Version 1.0 Dataset

Authors: S. J. Greybush, E. Kalnay, R. J. Wilson, R. N. Hoffman, T. Nehrkorn, M. Leidner, J. Eluszkiewicz, H. E. Gillespie, M. Wespetal, Y. Zhao, M. Hoffman, P. Dudas, T. McConnochie, A. Kleinboehl, D. Kass, D. McCleese, and T. Miyoshi

The Ensemble Mars Atmosphere Reanalysis System (EMARS) dataset version 1.0 contains hourly gridded atmospheric variables for the planet Mars, spanning Mars Year (MY) 24 through 33 (1999 through 2017). A reanalysis represents the best estimate of the state of the atmosphere by combining observations that are sparse in space and time with a dynamical model and weighting them by their uncertainties. EMARS uses the Local Ensemble Transform Kalman Filter (LETKF) for data assimilation with the GFDL/NASA Mars Global Climate Model (MGCM). Observations that are assimilated include the Thermal Emission Spectrometer (TES) and Mars Climate Sounder (MCS) temperature retrievals. The dataset includes gridded fields of temperature, wind, surface pressure, as well as dust, water ice, CO2 ice, and other atmospheric quantities. Reanalyses are useful for both science and engineering studies, including investigations of transient eddies, the polar vortex, thermal tides, and dust storms, and during spacecraft operations. This dataset is downloadable as netCDF files, and is documented in a companion paper.

The EMARS dataset is archived with the Penn State Data Commons, with a DOI of doi:10.18113/D3W375. The data can be accessed here.

The companion paper appears in the Geoscience Data Journal, with a DOI of doi:10.1002/gdj_xxxx.

The EMARS plotter can be accessed here.

A video highlighting transient eddies in EMARS can be found here.

Papers

Papers that use EMARS or describe its development include:

Greybush, S. J., H. E. Gillespie, and R. J. Wilson, 2019: Transient Eddies in the TES/MCS Ensemble Mars Atmosphere Reanalysis System (EMARS). Icarus, 317, 158-181, doi:10.1016/j.icarus.2018.07.001.

Waugh, D. W., A. Toigo, S. Guzewich, S. J. Greybush, R. J. Wilson, and L. Montabone, 2016: Martian Polar Vortices: Comparison of Reanalyses. JGR-Planets, 121, 9, 1770-1785, doi: 10.1002/2016JE005093.

Zhao, Y., S. J. Greybush, R. J. Wilson, R. N. Hoffman, and E. Kalnay, 2015: Impact of assimilation window length on diurnal features in a Mars atmospheric analysis. Tellus A, 67, 26042, doi: 10.3402/tellusa.v67.20642.

Greybush, S. J., E. Kalnay, K. Ide, T. Miyoshi, T. McConnochie, M. J. Hoffman, R. N. Hoffman, and R. J. Wilson, 2012: Ensemble Kalman Filter Data Assimilation of Thermal Emission Spectrometer (TES) Profiles into a Mars Global Circulation Model. J. Geophys. Res. Planets, 117, E11008, doi:10.1029/2012JE004097.

The creators of EMARS acknowledge the support of the NASA Mars Data Analysis Program. A full set of acknowledgements for this work can be found in the companion paper.