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A quantitative method for cryogenically sampling atmospheric water vapor on the temporal scale of 10 to 15 min in the field or laboratory is described. The sample apparatus is lightweight, affordable, and easy to assemble. The method allows for H₂O:CO₂ equilibration within the same sampling tubes and hence increases turnaround time for δ¹⁸O analysis. Quantitative analysis in the laboratory showed recovery of a vaporized, known, ¹⁸O water standard to 0.2‰ precision. Copyright © 2002 John Wiley & Sons, Ltd.