Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model
We examined the observed temperature data from Thermal Emission Spectrometer (TES) between heliocentric longitude L_s = 141° and 146° (∼10 Martian days in northern summer) during the mapping phase, then compared them with the simulated results using the NASA/Ames Mars general circulation model....
Published in: | Journal of Geophysical Research: Planets |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Geophysical Union
2001
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2000JE001330 |
id |
ftcaltechauth:oai:authors.library.caltech.edu:ctk9t-3n266 |
---|---|
record_format |
openpolar |
spelling |
ftcaltechauth:oai:authors.library.caltech.edu:ctk9t-3n266 2024-10-13T14:09:37+00:00 Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model Zhang, Kate Q. Ingersoll, Andrew P. Kass, David M. Pearl, John C. Smith, Michael D. Conrath, Barney J. Haberle, Robert M. 2001-12-25 https://doi.org/10.1029/2000JE001330 unknown American Geophysical Union https://doi.org/10.1029/2000JE001330 eprintid:37499 info:eu-repo/semantics/openAccess Other Journal of Geophysical Research E, 106(E12), 32863-32877, (2001-12-25) info:eu-repo/semantics/article 2001 ftcaltechauth https://doi.org/10.1029/2000JE001330 2024-09-25T18:46:39Z We examined the observed temperature data from Thermal Emission Spectrometer (TES) between heliocentric longitude L_s = 141° and 146° (∼10 Martian days in northern summer) during the mapping phase, then compared them with the simulated results using the NASA/Ames Mars general circulation model. Both show a strong polar vortex at the winter pole, higher equatorial temperatures near the ground and larger tropospheric lapse rates during daytime than at night. However, the simulation is colder than the observation at the bottom and top of the atmosphere and warmer in the middle. The highest wave activities are found in the polar front in both the simulations and the observations, but it is at a much higher altitude in the former. Experiments show that larger dust opacity improves the temperature field in the lower atmospheric levels. Using a steady state Kalman filter, we attempted to obtain a model state that is consistent with the observations. The assimilation did achieve better agreement with the observations overall, especially over the north pole. However, it is hard to make any further improvement. Dust opacity is the key factor in determining the temperature field; correcting temperature alone improves the spatial and temporal variations, it degrades the mean state in the south pole. Assimilation cannot improve the simulation further, unless more realistic dust opacity and its vertical profile are considered. © 2001 American Geophysical Union. Manuscript Accepted: 25 May 2001; Manuscript Received: 19 July 2000. We are indebted to all the engineers and scientists who worked on the mission of MGS, as well as those who are involved in routine operations of data management. We thank the two anonymous reviewers for their constructive comments. Published - 2000JE001330.pdf Article in Journal/Newspaper North Pole South pole Caltech Authors (California Institute of Technology) South Pole North Pole Journal of Geophysical Research: Planets 106 E12 32863 32877 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
description |
We examined the observed temperature data from Thermal Emission Spectrometer (TES) between heliocentric longitude L_s = 141° and 146° (∼10 Martian days in northern summer) during the mapping phase, then compared them with the simulated results using the NASA/Ames Mars general circulation model. Both show a strong polar vortex at the winter pole, higher equatorial temperatures near the ground and larger tropospheric lapse rates during daytime than at night. However, the simulation is colder than the observation at the bottom and top of the atmosphere and warmer in the middle. The highest wave activities are found in the polar front in both the simulations and the observations, but it is at a much higher altitude in the former. Experiments show that larger dust opacity improves the temperature field in the lower atmospheric levels. Using a steady state Kalman filter, we attempted to obtain a model state that is consistent with the observations. The assimilation did achieve better agreement with the observations overall, especially over the north pole. However, it is hard to make any further improvement. Dust opacity is the key factor in determining the temperature field; correcting temperature alone improves the spatial and temporal variations, it degrades the mean state in the south pole. Assimilation cannot improve the simulation further, unless more realistic dust opacity and its vertical profile are considered. © 2001 American Geophysical Union. Manuscript Accepted: 25 May 2001; Manuscript Received: 19 July 2000. We are indebted to all the engineers and scientists who worked on the mission of MGS, as well as those who are involved in routine operations of data management. We thank the two anonymous reviewers for their constructive comments. Published - 2000JE001330.pdf |
format |
Article in Journal/Newspaper |
author |
Zhang, Kate Q. Ingersoll, Andrew P. Kass, David M. Pearl, John C. Smith, Michael D. Conrath, Barney J. Haberle, Robert M. |
spellingShingle |
Zhang, Kate Q. Ingersoll, Andrew P. Kass, David M. Pearl, John C. Smith, Michael D. Conrath, Barney J. Haberle, Robert M. Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model |
author_facet |
Zhang, Kate Q. Ingersoll, Andrew P. Kass, David M. Pearl, John C. Smith, Michael D. Conrath, Barney J. Haberle, Robert M. |
author_sort |
Zhang, Kate Q. |
title |
Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model |
title_short |
Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model |
title_full |
Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model |
title_fullStr |
Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model |
title_full_unstemmed |
Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model |
title_sort |
assimilation of mars global surveyor atmospheric temperature data into a general circulation model |
publisher |
American Geophysical Union |
publishDate |
2001 |
url |
https://doi.org/10.1029/2000JE001330 |
geographic |
South Pole North Pole |
geographic_facet |
South Pole North Pole |
genre |
North Pole South pole |
genre_facet |
North Pole South pole |
op_source |
Journal of Geophysical Research E, 106(E12), 32863-32877, (2001-12-25) |
op_relation |
https://doi.org/10.1029/2000JE001330 eprintid:37499 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/2000JE001330 |
container_title |
Journal of Geophysical Research: Planets |
container_volume |
106 |
container_issue |
E12 |
container_start_page |
32863 |
op_container_end_page |
32877 |
_version_ |
1812816657593139200 |