The Isotopic Composition of Cyclonic Precipitation

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Abstract
The deuterium/hydrogen ratios δD of sequential samples of precipitation at Palisades, New York were measured during four separate storms during January 1978. The values ranged from a low of −177‰ to a high of −30‰. For each of the storms there was a general increase of δD values with time. The changes of δD values are explained by means of detailed meteorological analysis assuming that the precipitation derives from a Rayleigh condensation process in which all condensation in the air column directly above the station is assumed to fall immediately to the ground. The resulting calculated values of δD usually agree to within 5‰ of the observed measured values.

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