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8 INSTRUMENTATION DEVELOPMENT NEEDS FOR USE OF MASS-BALANCE TECHNIQUE
Pages 141-143

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From page 141...
... This equation states that the time rate of change, plus the mean advection of s, plus the vertical turbulent flux divergence of s is equal to the mean internal sources Ps and sinks Ls of s. Integrating vertically and applying (8.1)
From page 142...
... These methods require only mean concentration measurements. However, the box method assumes that the enclosure does not affect the surface flux, or at least that such effects can be corrected, and the profile method requires accurate measurements of concentration differences (on the order of 1 percent of the mean concentration or better)
From page 143...
... Whereas aircraft provide direct measurements of spatial averages of dry deposition fluxes, tower instrumentation provides a more detailed investigation of the factors that control these fluxes on a time-evolving basis. A comprehensive study would necessarily involve both techniques.


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