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A comparison of moisture variables in the vertical interpolations of a 4-D assimilation system

Author: Kenneth Mitchell; Chien-Hsiung Yang; U.S. Air Force Geophysics Laboratory. Atmospheric Sciences Division.
Publisher: Hanscom AFB, Massachusetts : Air Force Geophysics Laboratory, Air Force Systems Command, United States Air Force, 1985.
Series: AFGL-TR, 85-90.; Environmental research papers (Hanscom AFB, Mass.), no. 910.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
A fundamental activity of numerous numerical weather predictions centers is objective analysis of the global atomosphere. Typically, the objective analysis is a product of a four-dimensinal global data assimilation system. Such a system includes objective analysis, initialization, and global forecast model components. It is common for the objective analysis to be performed on constant pressure surfaces, while the  Read more...
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Additional Physical Format: Online version:
Mitchell, Kenneth (Kenneth Erwin), 1951-
Comparison of moisture variables in the vertical interpolations of a 4-D assimilation system
(OCoLC)1084465566
Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Kenneth Mitchell; Chien-Hsiung Yang; U.S. Air Force Geophysics Laboratory. Atmospheric Sciences Division.
OCLC Number: 13310937
Notes: Cover title.
Distributed to depository libraries in microfiche.
"11 April 1985."
"Atmospheric Sciences Division Project 2310."
Description: x, 77 pages : illustrations ; 28 cm
Series Title: AFGL-TR, 85-90.; Environmental research papers (Hanscom AFB, Mass.), no. 910.
Other Titles: Technical Report Archive & Image Library (TRAIL)
Responsibility: Kenneth Mitchell, Chien-Hsiung Yang.

Abstract:

A fundamental activity of numerous numerical weather predictions centers is objective analysis of the global atomosphere. Typically, the objective analysis is a product of a four-dimensinal global data assimilation system. Such a system includes objective analysis, initialization, and global forecast model components. It is common for the objective analysis to be performed on constant pressure surfaces, while the forecast model operates on the standard sigma coordinate or a close variant. This necessitates vertical interpolations between pressure surfaces and sigma-coordinate surfaces before and after the forecast. This study shows that the choice of moisture variable and interpolation method in the vertical interpolation can be crucial to preserving a reasonable moisture distribution in humidity assimilations. The use of relative humidity, dewpoint (T sub d), and specific humidity are tested in four two-point interpolation methods including linear, logarithmic, exponential, and power law. The standard use of logarithmic interpolation, is shown to be a suitable choice when vertically interpolating RH or T sub d, but a singularly poor choice when interpolating Q. Keywords: Humidity analysis.

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