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Monitoring and Assimilation of MLS Measurements in the DAO Ozone Data Assimilation SystemSince 1999 the DAO (Data Assimilation Office) at NASA Goddard has operationally assimilated ozone measurements in near real time. Currently, the assimilation system analyzes SBUV profile and total column measurements using an off line CTM with parameterized chemistry within the 3D-PSAS algorithm. During the last year the assimilation system was modified to either monitor or actively assimilate MLS (Microwave Limb Sounder) measurements in conjunction with the active assimilation of TOMS total column and SBUV profiles. It is expected that the active assimilation of MLS profiles will improve analysis results in two ways. First, there should be an improvement in the vertical resolution. Second, there should be an improvement in regions where SBUV measurements do not exist (such as in the polar night). A series of experiments using UARS (Upper Atmospheric Research Satellite) MLS data from December 1991 to March 1992 were run. In these experiments MLS data was either monitored in conjunction with active assimilation of the SBUV profile and TOMS total column measurements, or some combination of MLS, TOMS, and SBUV observations was actively assimilated. Monitoring of MLS data indicated that the MLS observations contain verifiable information that should improve the vertical structure of the analysis results, especially below the ozone peak and above the tropopause. The monitoring also substantiated the potential to improve the assimilation in the polar night. Active assimilation of MLS data does indeed improve the analysis results in these two ways, although the quality of the improvements is not uniform. This suggests that refinement of the specification of the error covariances might be needed to optimize the system. In addition it may be necessary to account for biases between the different sources of ozone information.
Document ID
20030054351
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Atlas, Robert
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Winslow, Nathan
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Stajner, Ivanka
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rood, Richard
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Subject Category
Computer Systems
Report/Patent Number
Paper-50664
Meeting Information
Meeting: AMS 12th Conference on Middle Atmosphere
Location: San Antonio, TX
Country: United States
Start Date: November 4, 2002
End Date: November 8, 2002
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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