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

Cited 3 time in wos
Cited 3 time in scopus
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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
Ham, Ji-Young
Hur, Soon Do
Lee, Won Sang
Han, Yeongcheol
Jung, Hyejung
Lee, Jeonghoon
Subject
Physical Geography; Geology
Keywords
ice chemistry; ice core; meltwater chemistry
Issue Date
2019-12
Citation
Ham, Ji-Young, et al. 2019-12. "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 laboratory observations of changes in the isotopic ratio (D/H and O-18/O-16) 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 constant (k(r)) and the fraction of ice participating in the exchange (f). We found that the rate constant 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 (delta O-18 vs delta D) 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
https://repository.kopri.re.kr/handle/201206/10835
DOI
http://dx.doi.org/10.1017/jog.2019.75
Appears in Collections  
2019-2020, Land-Ice/Ocean Network Exploration with Semiautonomous Systems: Thwaites Glacier (LIONESS/TG) - Toward understanding the fate of the Thwaites Glacier by abrupt collapse and its impact on global sea level changes - (19-20) / Lee, Won Sang (PM19020)
2019-2019, Reconstruction of past climate and environmental changes using high resolution ice core records in Victoria Land, Antarctica (19-19) / Hur, Soon Do (PE19040)
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