Determination of the distance between two adjacent stations,the observational vertical increment and the observational time interval in optimum sense |
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| Authors: | Dongxian Liao |
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| Institution: | StateMeteorologicalAdministration,Beijing |
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| Abstract: | Considering the observational error, the truncation error and the requirements of numerical weather prediction, three formulas
for determining the distance between two adjacent stationsd
1, the observational vertical increment Δp
1 and the observational time interval Δt
1 in optimum sense, have been derived. Since they depend on the shortest wavelength concerned and the ratio of maximum observational
error to wave amplitude, the results are quite different for different scale systems.
For the filtered model the values ofd
1, Δp
1, and Δt
1 general come near those required in the MANUAL on the GOS published in 1980 by WMO. But for the primitive equation model
the estimated value of Δt
1 is much less than those required in the filtered model case.
Therefore, it is improper to study the fast moving and developing processes of the atmospheric motion only on the basis of
the conventional observations. It seems to be necessary to establish an optimum composite observational system including the
surface-based system and the space-based system. |
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| Keywords: | |
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