By Dwayne Heard
Written as an authoritative advisor to the strategies of instrumental dimension for the atmospheric scientist, learn pupil or undergraduate, Analytical options for Atmospheric dimension makes a speciality of the tools used to make genuine time measurements of atmospheric gasoline and aerosol composition.
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3, atmospheric measurements are organised according to class of species, with detailed cross-referencing to sections of various chapters of the book that cover detection of that species via various methods. A brief discussion of the pros and cons of the methods available is given for some key species. 2 Previous texts describing methods for determining atmospheric composition There are very few books dedicated to the measurement of atmospheric composition, and even fewer that are current at the time of writing.
Balloons represent a relatively simple and inexpensive solution to this problem. Small (weather) balloons carrying a lightweight radiosonde (up to a few kg) have been used in their thousands to obtain profiles of meteorological parameters (pressure, temperature, humidity, wind direction and speed). 3) to measure ozone, and aerosols have also been measured using small instruments. Many stations worldwide release a fixed number of balloons each day to obtain a long-term record. 5) where p and T are ambient pressure and temperature, n is the (fixed) number of moles of helium (1 mole contains 6 02 × 1023 molecules) and V is the balloon volume.
The temporal and spatial variations of photolysis frequencies are illustrated for a number of important photolabile species, together with the controlling influence these rates have on the concentration of photochemically generated intermediates, for example the hydroxyl radical. 1 The measurement of atmospheric composition Units of concentration Concentrations of the most important atmospheric trace gases range over more than 10 orders of magnitude. Concentrations are expressed in several units, and it is useful to define their relationship.
Analytical Techniques for Atmospheric Measurement by Dwayne Heard