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Modification of a variational objective analysis model for new equations for pressure gradient and vertical velocity in the lower troposphere and for spatial resolution and accuracy of satellite dataSince late 1982 NASA has supported research to develop a numerical variational model for the diagnostic assimilation of conventional and space-based meteorological data. In order to analyze the model components, four variational models are defined dividing the problem naturally according to increasing complexity. The first of these variational models (MODEL I), the subject of this report, contains the two nonlinear horizontal momentum equations, the integrated continuity equation, and the hydrostatic equation. This report summarizes the results of research (1) to improve the way the large nonmeteorological parts of the pressure gradient force are partitioned between the two terms of the pressure gradient force terms of the horizontal momentum equations, (2) to generalize the integrated continuity equation to account for variable pressure thickness over elevated terrain, and (3) to introduce horizontal variation in the precision modulus weights for the observations.
Document ID
19870002652
Document Type
Contractor Report (CR)
Authors
Achtemeier, G. L. (Illinois State Water Survey Champaign, IL, United States)
Date Acquired
September 5, 2013
Publication Date
October 1, 1986
Subject Category
METEOROLOGY AND CLIMATOLOGY
Report/Patent Number
NAS 1.26:4025
NASA-CR-4025
Funding Number(s)
CONTRACT_GRANT: NAS8-36474
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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