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Atmospheric Model Development for MLRS.

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Final rept. 31 Jul 97-30 Mar 98,

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This report is divided into 5 letter reports covering the required scope of work tasks. The first task was the determination of the frequency distribution of 2, 3, and 4 rnsec wind speed at the surface, 199 and 1000 m elevation for 2 Korean stations TabTables lOS -1.1 and 1.2. Tables 108 - 1.3 to 1.5 display the conditions for the same thresholds for other climatic regimes, standardized here. We learn that the Korean stations have much weaker wind speeds than at these previous stations. The next letter report delineates the study of the wind direction turn angle from the surface to 300m 500, 1000, and 1500 m of elevation. Of special interest was the 300 m elevation. Table 108-2.1 illustrates the turn angle. The turn angle from zero to 45 degrees implies agreement with the Eknan Model of friction. It is not surprising, however, that Albrook in the tropics provides the highest frequency with almost 85 of data in this range, Thule shows the smallest amount. This is caused that cold air advection leads to backing, while friction and warm air advection shows veering of the wind. Thus cold air advection is expected to be low in the tropics Albrook, while it is highest at the polar station Thule. Similar results can be found for the additional tabulations 108 - 2.3 to 2.11. In letter report 3 the wind direction profile is presented which is associated with the exceedance level of the wind speed. It should be noticed that the exceedance levels in the heading of the Tables 108 - 3.1 - 3.4 are not exceedance levels for the wind direction but rather the associated mean profile direction for the wind speed profiles.

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  • Meteorology

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