Should Global Tropospheric Vapor Concentrations be Recorded on a Mass Density Basis?
Loux, Nicholas T.
Frick, Walter E.
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Extensive databases of tropospheric trace vapor concentrations have been published in the technical literature. In contrast to data reported in units of partial pressure, volume fraction, mole fraction, or mass concentration normalized to a reference temperature, data reported on an unnormalized mass concentration basis may exhibit a variation of as much as 50% when data from equatorial areas are compared with data from polar regions. Secondly, changes in tropospheric temperature are likely to yield variations in unnormalized mass concentration data substantially greater than variations attributable to either changes in surface air pressure or relative humidity. Lastly, atmospheric aerosol data also may be subject to these phenomena.