Abstract

Using a GCM fitted with tracer diagnostics, we examine how continental moisture recycling affects the stable water isotope content of precipitation, focusing on its contribution to the “noise” in the well‐established relationship between temperature and δ18O. On a global basis, for temperatures between −30° and 15°C, continental recycling explains more than a third of the variability in annual δ18O that is not explained by temperature. Recycling appears almost as important as temperature in defining δ18O distributions during northern hemisphere summer.

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