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    Assimilation of (A) TOVS data at the NASA Goddard Data Assimilation Office (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: At the NASA Goddard Data Assimilation Office (DAO), a 1D variational radiance assimilation system has been developed. This system, called DAOTOVS (Tiros operational vertical sounder (TOVS)), uses (A)TOVS level 1b radiances. It has been implemented within the DAO's semi-operational system as well as within the next generation data assimilation system that uses a finite-volume dynamical core. We will show results from (A)TOVS assimilation, including stratospheric analyses and validation. We will also describe our systematic error correction scheme which is based on collocated radiosondes.
    Keywords: Documentation and Information Science
    Type: ATOVS Conference; Sep 20, 2000 - Sep 26, 2000; Budapest; Hungary
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A Systematic Error Correction Method for TOVS Radiances (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Treatment of systematic errors is crucial for the successful use of satellite data in a data assimilation system. Systematic errors in TOVS radiance measurements and radiative transfer calculations can be as large or larger than random instrument errors. The usual assumption in data assimilation is that observational errors are unbiased. If biases are not effectively removed prior to assimilation, the impact of satellite data will be lessened and can even be detrimental. Treatment of systematic errors is important for short-term forecast skill as well as the creation of climate data sets. A systematic error correction algorithm has been developed as part of a 1D radiance assimilation. This scheme corrects for spectroscopic errors, errors in the instrument response function, and other biases in the forward radiance calculation for TOVS. Such algorithms are often referred to as tuning of the radiances. The scheme is able to account for the complex, air-mass dependent biases that are seen in the differences between TOVS radiance observations and forward model calculations. We will show results of systematic error correction applied to the NOAA 15 Advanced TOVS as well as its predecessors. We will also discuss the ramifications of inter-instrument bias with a focus on stratospheric measurements.
    Keywords: Geophysics
    Type: May 30, 2000 - Jun 03, 2000; Washington, DC; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Stratospheric Impact of 1D-Variation Assimilation of TOVS/ATOVS Data (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: This paper will present an assessment of the impact to the stratospheric circulation of the DAO-GEOS2 (Data Assimilation Office -Goddard Earth Observing System) attributable to an improved 1D-Variational retrieval of heights. The assimilated heights are retrieved from both the TOVS (TIROS Operational Vertical Sounder) and the ATOVS (Advanced TOVS) sounders. Each sounder's sensitivity to temperature changes in the stratosphere will be addressed and its relationship to the model's background flow evaluated. Also detailed are the steps to ensure the quality of the data being assimilated. Finally the temporal and spatial scales, important to the stratospheric mean flow, will be evaluated in terms of the DAO-GEOS2 response to the assimilated heights.
    Keywords: Geophysics
    Type: Jan 09, 2000 - Jan 14, 2000; Long Beach, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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