Download Analytical Techniques for Atmospheric Measurement by Dwayne Heard PDF

By Dwayne Heard

ISBN-10: 1405123575

ISBN-13: 9781405123570

Written as an authoritative advisor to the strategies of instrumental size for the atmospheric scientist, study pupil or undergraduate, Analytical options for Atmospheric size makes a speciality of the tools used to make actual time measurements of atmospheric gasoline and aerosol composition.

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1999). 1), and there are different requirements depending on the application. High accuracy is required in order to bring together data from a global network of monitoring stations, whereas high precision is required to measure fluxes of gases using very short integration periods or to monitor long-term trends for an individual trace species. (f) Integration or averaging period (response time) is another important factor, and the requirements vary widely, depending on the chemical lifetime and hence temporal variability in the atmosphere.

Although similar in concept, measurement of the absorption of IR or UV/visible radiation requires very different approaches. The converse of absorption is emission of radiation from excited states, and, in Chapter 4, Ezra Wood and Ronald Cohen describe the use of fluorescence from electronically excited atomic or molecular states to monitor atmospheric species. A major advantage is the observation of photons on a null background, rather than the measurement of a very small absorption of radiation as in some cases, but set against this is the absence of a convenient fundamental law to relate signal to concentration, and calibrations must be carried out.

There is a trend for larger instruments to be housed within custom-fitted, air-conditioned, standard size (20 feet, 6 m, in length) shipping containers, with attendant towers or sampling structures, and the requirements of the site are only a flat area of land together with electrical power (and for some instruments, running water). This type of arrangement has the added advantage of faster set-up and tear-down times. g. wind profiles, turbulence) in the atmosphere. Many of the instruments are housed in shipping containers for ease of transportation.

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