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Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model

Zhang, Kate Q. and Ingersoll, Andrew P. and Kass, David M. and Pearl, John C. and Smith, Michael D. and Conrath, Barney J. and Haberle, Robert M. (2001) Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model. Journal of Geophysical Research E, 106 (E12). pp. 32863-32877. ISSN 0148-0227. http://resolver.caltech.edu/CaltechAUTHORS:20130313-131349411

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Abstract

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.


Item Type:Article
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http://dx.doi.org/10.1029/2000JE001330DOIUNSPECIFIED
http://onlinelibrary.wiley.com/doi/10.1029/2000JE001330/abstractPublisherUNSPECIFIED
Additional Information:© 2001 American Geophysical Union. Issue published online: 19 December 2012; Article first published online: 19 December 2012; 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.
Record Number:CaltechAUTHORS:20130313-131349411
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130313-131349411
Official Citation:Zhang, K. Q., A. P. Ingersoll, D. M. Kass, J. C. Pearl, M. D. Smith, B. J. Conrath, and R. M. Haberle (2001), Assimilation of Mars Global Surveyor atmospheric temperature data into a general circulation model, J. Geophys. Res., 106(E12), 32863–32877, doi:10.1029/2000JE001330.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37499
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:14 Mar 2013 22:02
Last Modified:14 Mar 2013 22:02

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