NEWS AN D Notes Report Discusses Use of Units in Atmospheric mass-based units for expressing abundances, emis- Chemistry sion and deposition rates, and the like in order to better convey chemically meaningful relationships The Commission on Atmospheric Chemistry of the among these quantities. The chemical formula of International Union of Pure and Applied Chemistry the entity should be unambiguously specified. has recently conducted an examination of units for use 3) Local abundances of substances in air may be ex- in atmospheric chemistry. The results were published pressed as mixing ratios or concentrations. The in 1995 by S. E. Schwartz and P. Warneck in Pure mixing ratio has the advantage of being insensi- Applied Chemistry, 67, 1377-1406. tive to changes in pressure or temperature. Con- The document reviews the quantities pertinent to centration has advantages in describing reaction atmospheric chemistry, with particular emphasis on kinetics and material transport. quantities used to express abundances of substances 4) The dimensionless unit mol per mol of air is rec- (mixing rations, concentrations), reaction rates, and ommended to denote the mixing ratio of a sub- exchange rates between compartments (emission and stance in air—for example, nmol/mol—in lieu of deposition rates and fluxes, etc.) and
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Feb 1, 1996
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