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Isotopic variations of meltwater from ice by isotopic exchange between liquid water and ice

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Title
Isotopic variations of meltwater from ice by isotopic exchange between liquid water and ice
Other Titles
얼음과 융해수의 동위원소교환반응 연구
Authors
함지영
Hur, Soon Do
Lee, Won Sang
Han, Yeongcheol
정혜정
이정훈
Keywords
ice chemistry; ice core; meltwater chemistry
Issue Date
2019
Citation
함지영, et al. 2019. "Isotopic variations of meltwater from ice by isotopic exchange between liquid water and ice". JOURNAL OF GLACIOLOGY, 65(254): 1035-1043.
Abstract
Predicting the isotopic modification of ice by melting processes is important for improving the accuracy in paleoclimate reconstruction. To this end, we present results from cold room labora- tory observations of changes in the isotopic ratio (D/H and 18O/16O) of ice cubes by isotopic exchange between liquid water and ice in nearly isothermal conditions. A 1-D model was fit to the isotopic results by adjusting the values of two parameters, the isotopic exchange rate con- stant (kr) and the fraction of ice participating in the exchange ( f ). We found that the rate con- stant for hydrogen isotopic exchange between liquid water and ice may be greater (up to 40%) than that for the oxygen isotopic exchange. The range of the rate constant obtained from four melt experiments is from 0.21 to 0.82 h?1. The model results also suggest that f decreases with the increasing wetness of the ice. This is because with increasing water saturation in ice, water may be present only in the small pores or some of the water that was exchanged with ice may be bypassed, decreasing the effective surface area over which the isotopic exchange can occur. The relationship between the two water isotopes (δ18O vs δD) was observed and modeled and the slope was <8, which is significantly different from the slope of the meteoric waterline. We note that these slopes were obtained without considering the sublimation process.
URI
http://repository.kopri.re.kr/handle/201206/10125
DOI
http://dx.doi.org/10.1017/jog.2019.75
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