Abstract
A high‐frequency, field‐deployable liquid water isotope analyzer was developed that is capable of quantifying δ18O and δ2H to better than ±0.17 and ±0.32‰, respectively, on over 90 samples/d. The instrument was deployed for 4 contiguous weeks in the H. J. Andrews Experimental Forest Long‐term Ecological Research site in western Oregon, where it was used for real‐time measurement of the isotope ratios of precipitation and stream water during three large storm events. We were able to document fine‐scale changes in rainfall composition and damping effects in the stream channel continuously through these periods. We also performed a rain‐on‐snow experiment where we sampled leachate from a melting snow core continuously at 2 min intervals for 5 h. These data show remarkable fine‐scale patterns of internal rain‐snow mixing, patterns that would not have been detected without such high‐frequency sampling. These two preliminary applications show proof of concept of the new field analyzer, a device that will ultimately provide hydrologists with insight into water flow dynamics with unprecedented frequency over long time scales.
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