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Correlative assimilation data from the U.K. Meteorological Office
(UKMO) are included as supplementary data products to the UARS
Project. The main use of the correlative assimilation data is to
provide an independent analysis for comparison with data from the UARS
instruments. The analysed fields will be used as the basis for
diagnostic studies of the circulation of the middle atmosphere.
The numerical model used in the assimilation system is a global
primitive equation model, with a split-explicit time integration
scheme. It incorporates a comprehensive range of physical
parameterization schemes. It uses a hybrid vertical coordinate
system, with terrain-following model levels at low levels, gradually
changing to pressure levels in the stratosphere. The input to the
assimilation system are from the World Weather Watch network of
surface and upper air observations and satellite data.
The UKMO correlative assimilation data products consists of one data
file per day containing the following parameters:
- TEMP atmospheric temperature, degrees K
- HEIGHT geopotential height, m
- ZONWIN_P westerly (zonal) wind component, m/s
- MERWIN_P southerly (meridional) wind component, m/s
- OMEGA vertical velocity, Pa/s
NOTE: Vertical velocity is available in files dated 26 August 1992
onwards.
Data coverage is global for the UKMO correlative assimilation data
products. The horizontal resolution is 2.5 degrees latitude by 3.75
degrees longitude, using a staggered grid system. For parameters
other than wind components, each horizontal field consists of 73 rows
of 96 points, starting at 90N, 0E. The wind data are staggered by
half a grid, starting at 88.75N, 1.875E (with 72 rows).
The fields have been placed at the UARS standard pressure levels,
where the pressure levels are defined by P(i) = 1000*10**(-i/6),
i=0,1,2,... , where i is the index into the data array. Vertical
coverage for the UKMO correlative assimilation data is from 1000 mb to
0.316 mb.
Change History
- Version 2.0
- Version baselined on addition to the GES Controlled Documents List, May 5, 1998.
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Atmos Composition
