Work Description

Title: Data for Global Ionosphere Thermosphere Model Simulations with MSIS and WACCM-X boundary conditions Open Access Deposited
Attribute Value
  • WACCM-X Atomic oxygen densities on pressure grid are interpolated to altitude grid and used in Global Ionosphere Thermosphere Model (GITM). This simulation is then compared with GITM driven with MSIS as the lower boundary.

  • All neutral densities, temperature and winds at the lower boundary are kept the same between the two simulations apart from O densities. GITM w/ MSIS simulation uses O from MSIS where GITM w/ WACCM-X uses O from WACCM-X.

  • WACCM-X lower boundary files on altitude grid are in the folder 'waccm_lower_boundary_files' ; GITM w/ MSIS simulations are in the folder - run_msis_Jan_2010 and run_msis_June_2010; GITM w/MSIS diagnostic files are in the folder - run_msis_Jan_2010_USR_files; GITM w/ WACCM simulations are in the folder - run_waccm_Jan_2010 and run_waccm_June_2010; GITM w/ WACCM diagnostic files are in the folder - run_waccm_Jan_2010_USR_files.
  • This research aims to understand the importance of lower thermospheric atomic oxygen on the upper thermosphere. O number densities between 95-100 km from WACCM-X are much closer to the observations from SABER instrument on TIMED satellite as compared to those from MSIS. We show in this study that the correction of the lower boundary atomic oxygen yields better agreement between GITM and GUVI O/N2 in the upper thermosphere .
Contact information
Funding agency
  • Department of Defense (DOD)
ORSP grant number
  • AWD002625
Date coverage
  • 2019-05-15 to 2019-08-15
Citations to related material
  • Malhotra, G., Ridley, A. J., Marsh, D. R., Wu, C., Paxton, L. J., Mlynczak, M. G. (2020), Impacts of Lower Thermospheric Atomic Oxygen on Thermospheric dynamics and composition using the Global Ionosphere Thermosphere Model, Journal of Geophysical Research: Space Physics
Resource type
Last modified
  • 05/18/2020
  • 05/15/2020
To Cite this Work:
Malhotra, G., Ridley, A. Data for Global Ionosphere Thermosphere Model Simulations with MSIS and WACCM-X boundary conditions [Data set], (2020). University of Michigan - Deep Blue.


Files (Count: 10; Size: 444 GB)

These data files show a comparison of the Global Ionosphere Thermosphere Model (GITM)
simulations when two different lower boundary conditions are used.

GITM model:
GitHub code is here - and attached to this dataset : Routine to read in a GITM binary file

Description about the directories :

run_msis_Jan_2010 : GITM run with MSIS lower boundary condition for atomic oxygen.
run_waccm_Jan_2010 : GITM run with WACCM-X lower boundary condition for atomic oxygen.
run_msis_June_2010 : Same as above, but for June
run_waccm_June_2010 : Same as above, but for June

All other major species are kept constant at the lower boundary.

waccm_lower_boundary_files : Netcdf files containing WACCM-X atomic oxygen, interpolated
at 95 km, 97.5 km and 100 km.
run_msis_Jan_2010_USR_files : GITM binary files which contain diagnostic parameters.
run_waccm_Jan_2010_USR_files : Same as above, but for WACCM-X lower boundary condition

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